Propanal is a structural isomer of acetone.
Both acetone and propanal have the same molecular formula, which is C3H6O. However, the arrangement of atoms is different in these two compounds, which makes them structural isomers of each other. Specifically, acetone is a ketone, while propanal is an aldehyde.A ketone is a type of organic compound that has a carbonyl group, which is a carbon atom double-bonded to an oxygen atom, in the middle of the carbon chain. On the other hand, an aldehyde has a carbonyl group at the end of a carbon chain. In propanal, the carbonyl group is attached to the carbon at the end of the chain, while in acetone it is attached to the carbon in the middle of the chain.
In summary, propanal is a structural isomer of acetone, meaning they have the same molecular formula but different arrangement of atoms. Propanal is an aldehyde, while acetone is a ketone.
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What is most likely to react strongly with an acid? A. Noble gases B. All of these C. Lemon juice D. Metal hydroxides
Answer:
I think is B) All of these
Explanation:
Hey, there!!
The answer us option D.
Because acids easily reacts with metalic hydroxides to form salt and water.
\(hcl(aq) + naoh(aq) \: = h2o \: + \: nacl\)
For option A, B and C.
nobel gaeses donot react as they already have stable electronic configuration. All of this is not correct.Lemon juice is itself a citric acid.SO, THE ANSWER IS OPTION D.
Hope it helps
When a nucleus of ^235 U undergoes fission, it breaks into two smaller, more tightly bound fragments.
1) Calculate the binding energy per nucleon for ^235U? (Express with appropriate units)
2) Calculate the binding energy per nucleon for the fission product ^137 Cs?
The binding energy per nucleon is typically in the range of 8 to 10 MeV/nucleon for medium-weight nuclei such as ^235U. the binding energy per nucleon for the fission product ^137 Cs is approximately 1.085558768e-12 joules per nucleon.
To calculate the binding energy follow the steps. Determine the atomic masses of the individual protons and neutrons in the nucleus. You can find these values in a table of atomic masses. Count the number of protons and neutrons in the nucleus. For ^235U, there are 235 protons and 235-235=0 neutrons. Calculate the total mass of the protons and neutrons in the nucleus using their atomic masses and the number of each type of nucleon. Determine the total binding energy of the nucleus using the mass defect formula: Binding energy = (total mass of protons and neutrons) - (actual mass of nucleus) Calculate the binding energy per nucleon by dividing the total binding energy by the number of nucleons (protons + neutrons) in the nucleus.
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or the overall chemical reaction, the loss and gain of electrons must be Group of answer choices Not equal initial and final number of electrons Higher than initial number of electrons balanced Lower than initial number of electrons
For the overall chemical reaction, the loss and gain of electrons must be balanced, meaning that the initial and final number of electrons must be equal.
In the overall chemical reaction, the loss and gain of electrons must be balanced. This means that the initial and final number of electrons should be equal to maintain a stable reaction.
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Identify the part of the slow carbon cycle in which the total amount of carbon is most likely decreasing the most explain why this decrease the occurs
The slow carbon cycle involves processes that take place over geological timescales, including the transfer of carbon between the atmosphere, oceans, rocks, and soils. The total amount of carbon in each of these reservoirs can change over time due to various factors, such as natural and human-induced processes.
One part of the slow carbon cycle in which the total amount of carbon is most likely decreasing the most is the process of sedimentation of organic matter in ocean sediments. This occurs because the organic matter that sinks to the seafloor is buried and undergoes diagenesis, a process by which it is transformed into more stable forms of carbon, such as kerogen or graphite. The decrease in carbon occurs because the rate of sedimentation of organic matter is faster than the rate of carbon input from sources such as volcanoes, weathering of rocks, and human activities.
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Often, several different labs need to share a very small amount of evidence. It is important that the chain of custody be maintained. If the chain of custody is broken, then the evidence may not be allowed in a court proceeding. Identify the error in the following case. After obtaining the evidence, the first lab technician removed the tape that contained the signatures of the crime scene evidence collector. On completion of her examination of the evidence, the lab technician put the evidence into a paper bindle, and inserted thee bindle into an evidence bag. The technician sealed the bag in the same place as the original crime-scene investigator. After carefully sealing the bag, the lab technician signed her name across the tape. She completed the chain-of-custody form on the outside of the evidence bag and brought the evidence to the next lab technician at the crime lab.
Answer:
The errors in the case are;
1. Error; Removing the tape containing the signatures of the crime scene evidence collector, which removes the record/signature of the crime scene evidence collector in chain of custody
Correct; The original signature of the crime scene evidence collector should left on the package and the package should be opened at another location
2. Error; Placing the reseal back at the same location of the initial seal placed by the evidence collector
Correct; The package should be opened at a different area from the point in which it was sealed when it is received
3. Incorrect; Resealing the bag at the same point it was opened
Correct; On completion, the lab technician should place the evidence with the package, which was opened at a location different from its original opening, in a new package, which is then sealed and she should sign off on the evidence chain-of-custody log before bringing the evidence to the next lab technician at the lab
Explanation:
Evidence collection process requires the documentation of the specific place or spot that the evidence was located, proper evidence packaging, and maintenance of a correct chain of custody
A complete and proper chain of custody
a) Ensure the number of persons who handle the evidence is limited
b) Verify tat the chain of custody documents lists all the names, dates and identification number
c) Ensure to collect signed or secured receipt when the evidence is being transferred
how many atoms make up a molecule of salt
1?
2?
3?
4?
Answer: 2
Explanation: a molecule which consists of one atom of sodium and one atom of chlorine: NaCI
Mikayla says that air is an element since it has oxygen in it. Jose says that air is a mixture because each part of air keeps its properties. Grant says that both Mikayla and Jose are wrong, because air is a compound. Who is correct and why? Group of answer choices
Answer: Jose is correct because air is a mixture of gases ( both elements and compounds).
Explanation:
An element consist of only one type of atom and a compound made up of 2 or more types of elements joined together ( by ionic or covalent bonds).
Whereas air around us is a mixture of gases (both elements and compounds) like nitrogen, oxygen, argon, and carbon dioxide, and very small amounts of other gases and water vapors
Hence, Jose is correct because air is a mixture of gases ( both elements and compounds).
Why don't molecular compounds conduct electricity when dissolved in water?
Answer:
Ionic compounds conduct electricity when dissolved in water, because the dissociated ions can carry charge through the solution. Molecular compounds don't dissociate into ions and so don't conduct electricity in solution.
how does shaking or stirring a mixture of solute and solvent affect a solution?
When a solute and a solvent are mixed, shaking or stirring the mixture will increase the rate at which the solute dissolves into the solvent.
Shaking or stirring agitates the mixture, providing more surface area for the solute particles to come into contact with the solvent particles. As a result, the solute particles can break down and disperse throughout the solvent more quickly and efficiently.
Additionally, shaking or stirring can also increase the temperature of the mixture, which can further accelerate the dissolving process. However, it's important to note that shaking or stirring can also introduce air bubbles into the mixture, which can affect the final solution. Therefore, it's important to be mindful of how much shaking or stirring is necessary for the specific mixture in order to achieve the desired result.
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ASAP!!!!!! PLSS
This question has two parts. First, answer Part A. Then, answer Part B.
Part A
Fill in the blank question.
When as 30.98-g sample of phosphorus reacts with oxygen, a 71.00-g sample of phosphorus oxide is formed. What is the percent composition of the compound?
How many grams of phosphorus are in a 100.0g sample of the phosphorus oxide?
What percent of the phosphorus oxide is phosphorus?
What percent of the phosphorus oxide is oxygen?
Part B
Fill in the blank question.
What is the empirical formula for this phosphorus oxide compound?
Step 2:
How many moles of phosphorus?
How many moles of oxygen?
Step 3: Divide by the smallest # moles, make whole numbers.
What is the subscript for the phosphorus?
What is the subscript for oxygen?
The chemical has a percent composition of 56.35% oxygen and 43.65% phosphorus.
What is the empirical formula for a substance that contains 11.1% hydrogen and 88.9% oxygen?A substance has an oxygen content of 88.79% and a hydrogen content of 11.19%. Calculate this compound's empirical formula. Nonetheless, it's customary to employ the atom ratio with the smallest whole number. H 2 O is the compound's empirical formula as a result.
Determine the compound's overall mass:P mass of 30.98 g and O mass of 40.00 g add up to 70.98 g.
Phosphorus: \((30.98 g / 70.98 g) x 100% = 43.65%\)
\((40 g/70.98 g) x 100% = 56.35% for oxygen.\)
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which of the following solutions will have the highest boiling point? input the appropriate letter. a. 35.0 g of c2h6o2 in 250.0 g of ethanol (c2h5oh) b. 35.0 g of c3h8o in 250.0 g of ethanol (c2h5oh) c. 35.0 g of c4h10o in 250.0 g of ethanol (c2h5oh)
35.0 g of C4H10O in 250.0 g of ethanol (C2H5OH) have the highest boiling point.
Organic substances include ethanol. With the chemical formula C2H6O, it is an alcohol. Its chemical formula can alternatively be expressed as CH3CH2OH or C2H5OH (an ethyl group linked to a hydroxyl group). A volatile, flammable, colourless liquid known as ethanol has a distinctive wine-like odour and bitter flavour. It is a euphoric recreational substance that serves as the primary component of alcoholic beverages.Natural sources of ethanol include the fermentation of carbohydrates by yeasts or petrochemical processes like ethylene hydration. It has current medicinal uses as an antiseptic, disinfectant, solvent for certain drugs, and an antidote for methanol and ethylene glycol toxicity in addition to its historical usage as a general anaesthetic.
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complete question:Which of the following solutions will have the highest boiling point? Input the appropriate letter.
A. 35.0 g of C2H6O2 in 250.0 g of ethanol (C2H5OH)
B. 35.0 g of C3H8O in 250.0 g of ethanol (C2H5OH)
C. 35.0 g of C4H10O in 250.0 g of ethanol (C2H5OH)
A spring with a spring constant of 3N/m is stretched until extended by 1.4m. How much elastic potential energy is stored by the spring?
Give your answer to 2 decimal places
The energy that is stored in the spring is 2.94 J.
What is the elastic potential energy?We have to note that the elastic potential energy of the spring is the energy that has been stored in the spring and it is released to be able to do work once we pull the spring.
In this case we already know that;
W = 1/2Ke^2
W = work done
K = force constant
e = extension
Thus;
W = 0.5 * 3 * 1.4^2
W = 2.94 J
We can see that the stored energy for the spring in question is 2.94 J of energy stored.
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A very large tank initially contains 100 L of pure water. Starting at time t=0 a solution with a salt concentration of 0.5 kg/L is added at a rate of 6 L/min. The solution is kept thoroughly mixed and is drained from the tank at a rate of 4 L/min. Answer the following questions. 1. Let y(t) be the amount of salt (in kilograms) in the tank after t minutes. What differential equation does y satisfy? Use the variable y for y(t). Answer (in kilograms per minute):
dt
dy
= 2. How much salt is in the tank after 20 minutes? Answer (in kilograms)
After 20 minutes, there would be 0.75 kilograms of salt in the tank.
1. Let's derive the differential equation that y(t) satisfies. The rate at which salt is added to the tank is given by the concentration of the solution (0.5 kg/L) multiplied by the rate at which the solution is added (6 L/min). The rate at which salt is drained from the tank is given by the concentration of salt in the tank (y(t) kg/L) multiplied by the rate at which the solution is drained (4 L/min). Therefore, the differential equation is:
dy/dt = (0.5 kg/L * 6 L/min) - (y(t) kg/L * 4 L/min)
Simplifying further, we have:
dy/dt = 3 - 4y(t)
2. To find the amount of salt in the tank after 20 minutes, we can solve the differential equation. One approach is to find the particular solution by assuming y(t) takes the form of a constant, y. Substituting this into the differential equation, we have:
dy/dt = 3 - 4y
Setting dy/dt to zero (since y is constant), we can solve for y:
0 = 3 - 4y
4y = 3
y = 3/4
y = 0.75 kg
Therefore, after 20 minutes, there would be 0.75 kilograms of salt in the tank.
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Define kinetic energy. A) energy associated with the temperature of an object B) energy associated with the motion of an object C) energy associated with the force of an object D) energy associated with the gravity of an object E) energy associated with the position or composition of an object 2) Determine the density of an object that has a mass of 1498 g and displaces 12.1 mL of water when placed in a graduated cylinder. A) 8.08 g/mL B) 1.38 g/mL C) 12.4 g/mL D) 18.1 g/mL E) 11.4 g/mL 3) How many significant figures are in the measurement, 20.300 m?! A)3 B) 4 C) 5 D) 1 E)2 4) What does "X" represent in the following symbol? 80 358 A) mercury B) chlorine C) scandium D) bromine E) selenium 5) Write the formula for copper (II) sulfate pentahydrate. A) Cu2SO3 H5 B) Cu2S'H20 C) CuS 5H20 D) (CuSO4)5 E) CuSO4'5H20
1. B, the energy associated with the motion of an object
2. C, 12.4 g/mL
3. C, 5
1) B) Kinetic energy is energy associated with the motion of an object.
2) B) Density equals mass divided by volume: 1.38 g/mL
3) C) There are 5 significant figures in 20.300
4) A) 80 is the atomic number for mercury on the periodic table.
5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O
So in summary:
• Kinetic energy is the energy of a moving object due to its motion.
• Density is calculated by dividing an object's mass by its volume.
• Significant figures refer to the known precision of a measurement based on the digits reported.
• Atomic symbols represent elements on the periodic table.
• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.
How are protons and neutrons the same and how are they different?
Explanation:
Protons, Neutrons and Electrons are the three primary subatomic particles that form an atom.
Protons and Neutrons are large particles and are densely compacted into the nucleus of the atom. Protons are electrochemically positive in charge and the Neutrons are electrochemically neutral in charge.
Together the protons and Neutrons make up the mass of the atom.
Electrons are electrochemically negatively charged particles that move random around the nucleus. They have a relatively small mass compared to Protons and Neutrons. They are found in electron clouds that surround the nucleus and their movement and properties provide for the bonding characteristics of each atom.
What pillar of sustainability is broken by recycling
electronics in India? Should the US make a law that electronics can
only be recycled in the US?
The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.
Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.
However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.
Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.
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.(a) Explain why lizards become sluggish in cold weather.
(b) How is this phenomenon related to chemistry?
The sluggishness of lizards in cold weather is a natural adaptation to the changing temperatures. Their body's chemistry and metabolism are highly dependent on the temperature of their environment, which explains why they become less active and sluggish during colder months.
(a) Lizards are cold-blooded animals, meaning that their body temperature is dependent on the temperature of their environment. When the temperature drops, their metabolism slows down, which causes them to become sluggish and less active. This is because their muscles and nerves are not able to function at their normal rate in colder temperatures, which makes it harder for them to move and react quickly. Additionally, lizards need to conserve energy during colder months because their food sources may become scarce, so they may become less active in order to save energy.
(b) The phenomenon of lizards becoming sluggish in cold weather is related to chemistry because it involves the way that chemical reactions occur in the body. Metabolism is the set of chemical reactions that occur within an organism to maintain life, and it is highly dependent on temperature. When temperatures drop, the chemical reactions that occur in the lizard's body slow down, which affects their ability to function normally. Additionally, the chemical reactions that occur during muscle and nerve function are also affected by temperature, which is why lizards become less active in cold weather. Therefore, the relationship between lizards becoming sluggish in cold weather and chemistry is based on the way that chemical reactions are affected by temperature and how they impact the lizard's body.
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What is the speed of a car that travels 1000 m in 45 seconds?
Answer:
80,000km/h
Explanation:
Answer: 12.5 hope this is right.
Explanation:
10 moles of carbon dioxide has a mass of 440 g. What is the relative formula mass of carbon dioxide?
Answer: 44g
Explanation: The formular for finding Moles is ;
Moles = Mass / Molar Mass or Formular Mass.
Base on this question; Moles = 10, Mass = 440g, and Formular Mass = ?
Making 'Formular Mass', subject of the formular; we thus have;
Formular mass = Mass / Moles = 440/ 10 = 44g
a 0.513 g sample of an unknown compound occupies 291 ml at 298k and 2.93 atm. what is the molar mass of the unknown compound?
The molar mass of the unknown compound is 35.38 g/mol.
PV = nRT
First, we need to convert the volume from mL to L:
291 mL = 0.291 L
Next, we can solve for the number of moles of the unknown compound:
n = PV/RT = (2.93 atm)(0.291 L)/(0.08206 L atm/mol K)(298 K) = 0.0145 mol
molar mass = mass/number of moles = 0.513 g/0.0145 mol = 35.38 g/mol
Molar mass is a fundamental concept in chemistry that refers to the mass of one mole of a substance. It is usually expressed in units of grams per mole (g/mol). A mole is a unit of measurement used to express the number of atoms or molecules in a substance. One mole of any substance contains Avogadro's number of particles, which is approximately 6.022 x \(10^{23\).
Molar mass is important in chemical calculations, as it allows chemists to convert between mass and moles of a substance. This is useful in determining the amount of reactants needed in a chemical reaction, or the amount of product produced. Additionally, molar mass is used in the calculation of various other important properties of a substance, such as density, specific heat, and concentration.
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The initial rate of the reaction: BrO3- (aq) + 5Br-(aq) + 8H+(aq) 3Br2(l) + H2O(l) has been measured at the reaction concentrations shown in mol/L. Experiment[BrO3-][Br-][H+]Initial rate (mol/(L∙s)10.100.100.108.0 x 10-420.200.100.101.6 x 10-330.100.200.101.6 x 10-340.100.100.203.2 x 10-3Determine the order of reaction with respect to each reactant
To determine the order of the reaction with respect to each reactant, we must compare how the reaction rate changes when its concentration changes.
We have in experiment one the same concentration of reactants and a speed equal to 8.0x10^-4 mol/(L.s).
Now, in the second experiment, the concentration of BrO3 doubles, and the rest of the reagents remain the same. The speed is also doubled since 8.0x10^-4 x 2 = 1.6 x 10^-3.
The same happens with Br-, in the third experiment. The rate doubles as the Br concentration doubles.
So for these two reactants, the rate of reaction will be first-order, since as the concentration increases the rate increases in the same proportion.
Now, for H+ we have that by doubling the concentration the rate quadruples. This means that the reaction order is second order. When changing the concentration, the speed changes in order equal to 2
Answer:
the order of reaction will be:
Respect BrO3-: First order
Respect Br-: First order
Respect H+: Second order
Which of the following combinations would make the best buffer? Select the correct answer below: a. HCOOH and KOH b. HCOOH and HCOOK c. H2, SO, and KOH d. HCl and HCOOK
The best buffer combination among the given options would be b. HCOOH and HCOOK. A buffer solution is one that resists significant changes in pH when small amounts of an acid or a base are added.
Buffers usually consist of a weak acid and its conjugate base or a weak base and its conjugate acid.
In option b, HCOOH (formic acid) is a weak acid and HCOOK (potassium formate) is its conjugate base. This combination allows the buffer to neutralize both added acids and bases effectively. When an acid is added, HCOOK will react with it, while if a base is added, HCOOH will react to maintain the pH.
In contrast, the other options are less effective as buffers. Option a includes a strong base (KOH), which cannot maintain a stable pH when combined with a weak acid. Option c has unrelated compounds and doesn't include a weak acid/base-conjugate pair. Option d includes a strong acid (HCl), which, like a strong base, is unsuitable for a buffer solution.
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How many moles of ions are there in 1 mole of iron (III) oxide, Fe2O3?
Answer:
So one mole of Fe2O3 contains two moles of Fe3+ ions.
Explanation:
As there is an internal mole ratio of 2:3
It means that there are 2moles of iron within every mole of iron(III) oxide.
Iron III oxide is an ionic compound composed of Fe3+ ions and O2- ions. According to the formula, there are three O2- ions for every two Fe3+ ions.
Extra:
One 'unit' of Fe2O3 has two Fe3+ ions and three O2- ions, hence a dozen Fe2O3 contains two dozen Fe3+ ions and three dozen O2- ions, and a mole Fe2O3 contains two moles Fe3+ ions and three moles O2- ions.
What is the mass of 0.55 mole
of magnesium chloride?
Answer:
SYMBOLS, FORMULAS AND MOLAR MASSES
OBJECTIVES
1. To correctly write and interpret chemical formulas
2. To calculate molecular weights from chemical formulas
3. To calculate moles from grams using chemical formulas
INTRODUCTION
Part I. Symbols and formulas
An element is a homogeneous pure substance made up of identical atoms. All matter is made
up of elements and, since chemistry is the study of matter, it is convenient to use symbols to represent
the elements rather than using the entire name.
By international agreement, specific symbols are assigned to each element (Note: This means
that while names of the elements vary with language, symbols are constant throughout the world.) Each
element is assigned a one- or two-letter symbol. The first letter is capitalized, the second (if there is
one) is not. While this often seems trivial, it is in fact a very important point. For example, in chemical
language Co represents cobalt, which is a metal and an element, while CO represents carbon monoxide,
a compound which is a colorless, odorless gas! Even when there is not an obvious correspondence,
for instance "MN", it can cause confusion. Do you mean the element manganese? Did you forget a
letter and mean something else? Are you using "M" to represent something else entirely? Chemists
sometimes use "M" to represent any metal. It is well worth the trouble to memorize the symbols for
common elements.
Since compounds consist of elements, the chemical formulas of compounds also consist of
elements with subscripts used to denote the number of atoms per molecule. If there is no subscript, it is
implied that there is one of that kind of atom. Ones never appear in chemical formulas. Not only do
subscripts denote ratios of atoms, they also denote the ratio of moles of element to one mole of
compound. Parentheses can be used to show groups of atoms, with the subscripts showing how many
groups there are. Parentheses are not used if there is only one group.
Examples: For one mole of the following compounds, how many moles of each element are
present?
MgCl2 1 mole Mg, 2 moles Cl
Mg(NO3)2 1 mole Mg, 2 moles N, 6 moles O
NaNO3 1 mole Na, 1 mole N, 3 mole O
AgCl 1 mole Ag, 1 mole ClPart II. Molar Masses
Each atom has a different size and therefore a different mass. The relative masses of each
element can be found on the periodic table. For example, one atom of magnesium weighs 24.31 amu
(atomic mass units). However, one mole of magnesium weighs 24.31 g. (Moles were planned that
way!) Since one mole of MgCl2 consists of one mole of magnesium and two moles of chlorine, the
mass of one mole of MgCl2 must be the sum of the masses of the elements. The mass of one mole of a
substance is called the molar mass or molecular weight.
Examples: What is the molar mass of the following compounds?
MgCl2 24.31 + 2(35.45) = 95.21 g/mol
Mg(NO3)2 24.31 + 2(14.01) + 6(16.00) = 148.33 g/mol
NaNO3 23.00 + 14.01 + 3(16.00) = 85.01 g/mol
AgCl 107.9 + 35.45 = 143.4 g/mol
(Note: Yes! You DO have to count significant figures when calculating molecular weight/molar
mass. However, the number of significant figures may vary depending on which periodic table you use.)
Chemists are generally interested in number of moles. Unfortunately, it is impossible to measure
moles directly. However, masses are easily measured, and if the chemical formula of the compound is
known, the molar mass can be used to determine the number of moles. The molar mass is defined as:
molar mass = grams/moles = g/mol (1)
Moles may be calculated by using molar mass as a conversion factor in dimensional analysis where
molar mass in grams = 1 (exactly) mole of compound (2)
This method is used in multi-step calculations. For example, if 0.873 g of MgCl2 is weighed out, it
is 9.17 x 10-3
moles.
1 mole
0.873g x 95.21 g = 9.17 x 10-3
mol MgCl2 (3)
However, 0.873 g of AgCl is only 6.09 x 10-3
mol.
1 mole
0.873g x 143.4 g = 6.09 x 10-3
mol AgCl (4)Molar mass may also be used to relate moles to grams. For example, 0.158 mol of MgCl2 is 15.2 g.
0.158 mol x 95.21 g = 15.2 g MgCl2 (5)
1 mol
Percent is used to express parts per one hundred. Usually in chemistry, it refers to
g of species of interest x 100 = % (6)
g of whole thing
Example: For the % Mg in MgCl2: In one mole of MgCl2, there are 24.31 g of Mg (molar mass of Mg,
the part we are interested in) and 95.21 g of MgCl2 (the whole thing), so %Mg in MgCl2 is
(24.31/95.21) x 100 = 25.53% Mg (7)
PROCEDURE
Work individually.
The formula for calcium phosphate is Ca3(PO4)2. Weigh about 2 g of calcium phosphate to the
nearest 0.001 g. In other words, you do not have to have exactly 2.000g, but you must know the
weight you have exactly. Acceptable results include but are not limited to: 1.985g , 2.035g, 2.314g
etc.
Be sure to report all results with the correct number of significant figures and appropriate units!
elect all the statements that correctly describe the bonding and geometry in the polyatomic ion SeCl5-.
The molecular geometry is square pyramidal.
There are 6 electron domains around the central atom.
There is one lone pair on the central atom.
As stated in the preceding statement Square pyramidal geometry describes the molecules.
An atom is what?An atom is made up of a core nucleus and one or maybe more electrons with negative charge that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present.
What are an example and an atom?The quantity of protons an atom has makes it distinct from other atoms. Consequently, a particle devoid of protons isn't just an atom. But even a single proton constitutes every atom (of hydrogen). Individual particles of something like the periodic table elements like sodium, plutonium, argon, among chlorine are examples of atoms.
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Which orbital sublevel fills up immediately
BEFORE the 3d sublevel?
Answer:
the answer is c
Explanation:
Why do solids turn into liquid?
Solid turns into liquid by heating or melting.
A solid is made up of closely packed particles that are organised into a certain geometric pattern or crystal lattice. Although these particles vibrate while stationary, they are immobile. Particles vibrate more quickly and more intensely when heat is supplied to a solid. Particles can travel more freely because of the weakening and eventual breaking of the bonds that result from the increased mobility.
The solid starts to lose its stiffness and start to resemble a liquid as the particles move more freely. The particles in a liquid are still close together but are no longer organised into a predetermined lattice pattern. The alternative is that they can move and flow around one another, assuming the form of their container.
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An electrolytic cell transferred 0.10 m o l of electrons when a constant current of 2.0 A was applied. How many hours did this take?
Answer:
1.34 hr
Explanation:
From the question given above, the following data were obtained:
Number of mole of electron (e) = 0.1 mole
Current (I) = 2 A
Time (t) =?
Next, we shall determine the quantity of electricity transferred. This can be obtained as follow:
1 mole of electron = 96500 C
Therefore,
0.1 mole of electron = 0.1 × 96500
0.1 mole of electron = 9650 C
Thus, 9650 C of electricity was transferred.
Next, we shall determine the time. This can be obtained as follow:
Current (I) = 2 A
Quantity of electricity (Q) = 9650 C
Time (t) =?
Q = It
9650 = 2 × t
Divide both side by 2
t = 9650 / 2
t = 4825 s
Finally, we shall convert 4825 s to hour. This can be obtained as follow:
3600 s = 1 hr
Therefore,
4825 s = 4825 s× 1 hr / 3600 s
4825 s = 1.34 hr
Thus, the time taken is 1.34 hr
write a balanced equation for the reaction between hydrobromic acid and sodium carbonate.
2HBr + Na2CO3 → 2NaBr + H2O + CO2 In this balanced equation, hydrobromic acid (HBr) reacts with sodium carbonate (Na2CO3) to produce sodium bromide (NaBr), water (H2O), and carbon dioxide (CO2).
The equation shows the stoichiometric relationship between the reactants and products. Two moles of hydrobromic acid react with one mole of sodium carbonate to form two moles of sodium bromide, one mole of water, and one mole of carbon dioxide. This reaction is a double displacement reaction, where the positive ions of the acids and bases swap to form new compounds. The equation is balanced, meaning that the number of atoms of each element is the same on both sides of the equation, satisfying the law of conservation of mass.
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Ahmed’s teacher has set up a Geiger-Mueller tube to detect nuclear radiation. She has not yet started to get out the school’s nuclear radiation sources. Ahmed notices there is a low count rate on the detector. State the name for this normal, low-level measurement.
The normal, low-level measurement on the detector when dealing with a Geiger-Mueller tube to detect nuclear radiation is known as background radiation.
What is Radiation?This is referred to as the emission or transmission of energy through space or a material medium. This is usually in the form of waves or particles and it is used for various purposes such as in treatment of diseases.
Radiation can also cause a change in DNA thereby resulting in mutation when exposed to large amounts. Geiger-Mueller tube is used to detect nuclear radiation by scientists for various operations.
In a scenario where there is a low count rate on the detector, it means small amounts were released which is known as the background radiation and it is responsible for the normal, low-level measurement.
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