Explanation:
1. Pb(CO3)2
Element Number Mass Percet Composition
Oxygen 6 16.00 29.34%
Carbon 2 12.01 7.34%
Lead 1 207.21 63.32%
2. Ga(OH)3
Element Number Mass Percet Composition
Hydrogen 3 1.0079 2.50%
Oxygen. 3 16.00 39.75%
Gallium 1 69.72 57.74%
3. P4O10
Element Number Mass Percet Composition
Oxygen. 10 16.00. 56.36%
Phosphorus. 4 30.97 43.64%
4. Ca3P2
Element Number Mass Percet Composition
Phosphorus 2 30.97 34.00%
Calcium. 3 40.08 66.00%
5. Ti(NO3)3
Element Number Mass Percet Composition
Oxygen. 9 16.00 61.56%
Titanium. 1 47.87 20.47%
Nitrogen. 3 14.01 17.97%
Solid lithium hydroxide is used to "scrub" CO2 from the air inspacecraft and submarines; it reacts with the CO2 to produce lithium carbonate and water. What volume in liters of CO2 at 20°C and 753 torr can be removed by reaction with 440 g of lithium hydroxide?
Answer:
223 L
Explanation:
Step 1: Write the balanced equation.
2 LiOH + CO₂ = Li₂CO₃ + H₂O
Step 2: Calculate the moles corresponding to 440 g of LiOH
The molar mass of LiOH is 23.95 g/mol.
440 g × (1 mol/23.95 g) = 18.4 mol
Step 3: Calculate the moles of CO₂ that react with 18.4 moles of LiOH
The molar ratio of LiOH to CO₂ is 2:1. The reacting moles of CO₂ are 1/2 × 18.4 mol = 9.20 mol.
Step 4: Convert 20°C to Kelvin
K = °C + 273.15 = 20 + 273.15 = 293 K
Step 5: Convert 753 torr to atm
753 torr × (1 atm/760 torr) = 0.991 atm
Step 6: Calculate the volume of CO₂
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 9.20 mol × (0.0821 atm.L/mol.K) × 293 K / 0.991 atm
V = 223 L
The chemical formula for magnesium oxide is 2MgO. The number 2 represents the number of ___.
oxygen atoms
magnesium atoms
magnesium oxide molecules
Answer:
magnesium oxide molecules
Explanation:
this is because the two is before the formula of MgO
Which of the following things would be the MOST irresistible for a dog?
A
a veterinarian
B
a fire hydrant
C broccoli vomit surprise
Answer:
B.a fire hydrant
hope it helps!
Answer:
a veterinarian
Explanation:
i think
Jessie we must cook all of the supply before Gustavo Fring comes. We need to make 8 pounds of the crystal and each pound is 2 crystals. How much of our supply can we make before Gustavo Fring coms
The total supply is not known, hence, cannot be determined.
Dimensional analysisIf each pound of the crystal contains 2 crystals, then 8 pounds of crystal will contain:
8 pounds x 2 crystals/pound = 16 crystals
So, Jessie and co need to make 16 crystals before Gustavo Fring comes.
However, without knowing the amount of their current supply or the time frame available before Gustavo Fring arrives, it is impossible to determine how much of the supply that can be used to make the 16 crystals.
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Write 5 facts you know about weather and climate.
1) You can tell the temperature by counting a cricket's chirps! 2) Sandstorms can swallow up entire cities. 3) Dirt mixed with wind can make dust storms called black blizzards. ... 5) The coldest temperature ever officially recorded was -89.2°C.
Helpppppp plsssssssss
Answer:
air,water,rocks,and the ibex
Explanation:
these are the non living things I'm pretty sure
What is the “x” shaped product of DNA replication called?
A
parent cell
B
cytokinesis
C
chromosome
D
nuclear membrane
The “x” shaped product of DNA replication called as chromosome. Therefore, option C is correct.
What is DNA ?A polymer made of two poly nucleotide chains that coil around one another to form a double helix is called deoxyribonucleic acid. All known organisms and many viruses have genetic information in the polymer that is necessary for their development, operation, growth, and reproduction.
Adenine (A), cytosine (C), guanine (G), and thymine are the four different types of smaller chemical molecules together known as nucleotide bases that make up the linear molecule DNA (T). The DNA sequence refers to the arrangement of these nucleotides.
DNA is crucial for inheritance, protein coding, and supplying guidelines for life and its processes in all living organisms. DNA controls a person's or an animal's growth, reproduction, and final demise. There are 46 chromosomes in total in each of a human cell's 23 pairs of chromosomes.
Thus, option C is correct.
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Question 2 of 10
Which chemical equation is balanced?
A. CO₂ + H₂O → H₂CO₂
B. K+ H₂O → K₂O + H₂
C. CaO2 + HCl → CaCl₂ + H₂O
OD. MgO + 2HCl → MgCl₂ + H₂O
The equation MgO + 2HCl → MgCl₂ + H₂O is a balanced equation.
A balanced chemical equation contains equal number of atoms on both sides of the equation.The equation is MgO + 2HCl → MgCl₂ + H₂O which contains 1 atom of Mg, 2 atoms of chlorine, 2 atoms of chlorine, 1 atom of oxygen on both reactants and products sides.So the equation is balanced.An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have equal amounts of mass and charge.It follows law of conservation of mass.Mass is neither created nor destroyed rather it can be transferred from one form to another.Learn more about balanced equation at:
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a 1.642 g sample of calcium bromide is dissolved in enough water to give 469.1 mL of solution what is the bromide ion concentration in this solution
The bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.
How to calculate concentration?The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.
No of moles of calcium bromide is calculated as follows:
moles = 1.642 ÷ 199.89 = 8.215 × 10-³moles
Molarity = 8.215 × 10-³moles ÷ 469.1mL = 1.75 × 10-⁵M
Therefore, the bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.
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Which of the following would make experimental results more reliable? A. choosing the data that match the hypothesis B. performing the experiment multiple times C. increasing the number of variables in the experiment D. adding the experimenter's opinion to the conclusions
I think the answer is C. (Increasing the number of variables in the experiment)
Answer:
ITS B
Explanation:
THE OTHER GUY WAS WRONG
1 Which one of these atoms will have electrons in its outermost shell (highest energy level) that experience the greatest attractive force between themselves and the nucleus?
helium lithium fluorine potassium argon
Explain your answer. [4 marks]
2 Explain why potassium is more reactive than lithium. (I) [4 marks]
3 Explain why fluorine is more reactive than bromine. (4) [4 marks]
4 Predict the difference in reactivity, giving reasons, seen in:
a Group 2, between magnesium and calcium
[5 marks]
b Group 6, between oxygen and sulfur.
[5 marks]
A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol.
A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.
We must compute the empirical formula in order to ascertain the compound's chemical composition.
If we have 100 grams of the compound.
This suggests we have:
30.4 g of nitrogen
69.6 g of oxygen
Now, we have to convert the mass of each element to moles.
The molar mass of nitrogen (N) = 14.01 g/mol
the molar mass of oxygen (O) = 16.00 g/mol.
Number of moles of nitrogen (N):
2.17 mol
Number of moles of oxygen (O):
4.35 mol
The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.
Moles N / moles O = 2.17 mol / 2.17 mol = 1.00
Moles O / moles O = 4.35 mol / 2.17 mol = 2.00
The ratio is approximately N₁O₂.
We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.
The molecular formula of the compound is NO₂.
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The fake pill or medicine taken by members of a control group is a * what could the answer be
A. placebo.
B. hypothesis.
C. double-blind experiment.
D. Variable
Answer:
placebo
Explanation:
A placebo is usally given when trying to analyse data. it helps to also helps to ascertain the impact of yhe mesication.
which is the graph of the function g(x) = f(-x)
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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Please help fast
A person breathes in 6.0 L of pure oxygen at 298 K and
1,000 kPa to fill their lungs
How many moles of oxygen did they take in?
Use the ideal gas law: PV = nRT where R = 8.31 L – kPa /mol – K
A) 0.05 mole
B) 0.41 mole
C) 2.42 moles
D) 20.0 moles
Moles of Oxygen they took in : C. 2.42
Further explanationThe gas equation can be written
\(\large{\boxed{\bold{PV=nRT}}}\)
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08205 l.atm / mol K
T = temperature, Kelvin
P=1000 kPa
V = 6 L
T = 298 K
moles of Oxygen :
\(\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1000\times 6}{8.31\times 298}\\\\n=2.42~moles\)
what mass of carbondioxide is formed when 60.0g of carbon is burned in 750g of oxygen
The mass of carbon dioxide formed when 60.0g of carbon is burned in 750g of oxygen is 810 g
The balanced chemical equation of the reaction can be represented as follows:
Balanced equationC + O₂ → CO₂Using the law of the conservation of mass, the mass of the reactant must be the same as the mass of the product.
The law of conservation of mass states that matter can neither be created nor destroyed but can be transformed from one form to another.
Therefore,
C + O₂ → CO₂
60 + 750 = 810 g
Therefore, the mass of carbon dioxide formed is 810 grams.
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Type the correct answer in the box. The density is 1.26grams/ centimeters. How many pounds/foot is this? Use the conversion rates of 454 grams/1 pound and 28,317 centimeters/1 ft.. Express your answer to the correct number of significant figures.
Answer: 78.59 lb/ft
Explanation:
use stoichiometry to solve
1.26g/cm x ( 1pound/ 454 grams) X (28317 Cm/1 ft) = 78.59 pounds/ft
I have a balloon that can hold 100. liters
of air. If I blow up this balloon with 3.0
moles of oxygen gas at a pressure of 1.0
atmosphere, what is the temperature of
the balloon?
Answer:
T = 4.062V
Explanation:
from PV = nRT => T = PV/RT
P = 1 atm
V = Final Volume
n = 3 moles
R = 0.08206 L·atm/mol·K
T = ?
T = 1 atm · V(Liters)/(3 moles)(0.08206L·atm/mol·K) = 4.062·V(final) Kelvin
The temperature of the balloon is 406 K
We'll begin by listing out what was given from the question. This is shown below:
Volume (V) = 100 L
Mole of oxygen (n) = 3 moles
Pressure (P) = 1 atm
Temperature (T) =?We can obtain the temperature of the balloon by using the ideal gas equation as shown below:
PV = nRTNOTE:P is the pressure.
V is the volume.
n is the number of mole
R is the gas constant (0.0821 atm.L/Kmol)
T is the temperature.
Applying the ideal gas equation, we have:
PV = nRT
1 × 100 = 3 × 0.0821 × T
100 = 0.2463 × T
Divide both side by 0.2463
T = 100 / 0.2463
T = 406 KTherefore, the temperature of the balloon is 406 K
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Monitor the temperatures at the same time ever day, and record your data in a chart like the one below. When you take the temperatures each day, write down your visual observations of the current weather such as rainy, sunny, windy, cloudy, and so on.
The weather condition of the place each day is influenced by the temperature.
Does daily temperature affect weather conditions?We know that the weather is the way that the place is in terms of the rain or the sunshine or the general temperature of the place. In this case, the student has been asked to observe the weather temperature of the place that is under study.
The result of the experiment would show that the temperature does have a huge effect on the weather condition of a place.
The implication of that is that the weather condition of the place each day would have something to do with the temperature.
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Zn-64 = 48.63%
Zn-66 = 27.90%
Zn-67 = 4.10%
Zn-68 = 18.75%
Zn-70 = .62%
Calculate the average atomic mass/given their percent abundance
Answer:
A = 65.46 u
Explanation:
Given that,
The composition of zinc is as follows :
Zn-64 = 48.63%
Zn-66 = 27.90%
Zn-67 = 4.10%
Zn-68 = 18.75%
Zn-70 = .62%
We need to find the average atomic mass of the given element. It can be solved as follows :
\(A=\dfrac{48.63\times 64+27.90\times 66+4.1\times 67+18.75\times 68+0.62\times 70}{100}\\A=65.46\ u\)
So, the average atomic mass of zinc is 65.46 u.
is bronze homogeneous or heterogeneous
Answer:
Homogenous
Explanation:
Mixture of copper and tin
what is effects of azeotrope system?
Answer:
An azeotrope or a constant boiling point mixture is a mixture of two or more liquids whose...Such a system of solvents is known as a heteroazeotrope. ... that will affect the volatility of one of the azeotrope constituents more than another.
Explanation:
Azeotrope, in chemistry, a mixture of liquids that has a constant boiling point because the vapor has the same composition as the liquid mixture. The boiling point of an azeotropic mixture may be higher or lower than that of any of its components.
Determine the mass of water formed when 12.5 L NH 3 (at 298 K and 1.50 atm) is reacted with 18.9 L of O 2 (at 323 K and 1.1 atm).
4 NH 3( g) + 5 O 2( g) → 4 NO( g) + 6 H 2O( g)
16.93g of water formed when 12.5 LNH3 (at 298 K and 1.50 atm) is reacted with 18.9 L of O2 (at 323 K and 1.1 atm).
What is water in chemistry?The primary component of Earth's hydrosphere and the fluids in all known living things is water (H2O), an inorganic chemical that is transparent, tasteless, odorless, and almost colorless (in which it acts as a solvent).
Despite not providing food, energy, or organic micronutrients, water is necessary for all known forms of life. Each of its molecules has one oxygen and two hydrogen atoms, which are connected by covalent bonds, as indicated by the chemical formula H2O. At a 104.45° angle, the hydrogen atoms are joined to the oxygen atom.
We will use the idea gas equation to calculate the moles of NH3 and O2
that is Pv= n RT
where; P= pressure,
V= volume,
n = number of moles,
R=gas constant = 0.0821 l .atm/ mol.K
can also be written as
n = PV /RT
The moles of NH3
n= (1.50 atm x 12.5 L) /( 0.0821 L. atm /mol.k x 298 K) = 0.766 moles
The moles of O2
=(1.1 atm x 18.9 L) / ( 0.0821 L. atm/ mol.k x 323 K) = 0.784 moles
Now we will write the reaction between NH3 and O2
4 NH3 + 5 O2 → 4 No +6H2O
from equation above 0.766 moles of NH3 reacted to produce
0.766 x 6/4 =1.149 moles of H2O
0.784 moles of O2 reacted to produce
0.784 x 6/5 = 0.9408 moles of H20
As we can see O2 is totally consumed, O2 is the limiting reagent and therefore the moles of H2O produced = 0.9408 moles
Mass of H2O = moles x molar mass
Molar mass of H2O = (1 x2)+16= 18 g/mol
mass = 18 g/mol x 0.9408 moles
= 16.93 grams
Thusm 16.93g of water formed when 12.5 L NH 3 (at 298 K and 1.50 atm) is reacted with 18.9 L of O 2 (at 323 K and 1.1 atm).
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22. What is the excess reactant for the following reaction given we have 2.6 moles of HCl and
1.4 moles of Ca(OH),?
2HCl + Ca(OH), → 2H,0 +CaCl,
>
Answer:Cells in the thyroid have much higher concentrations of iodide ions than the extracellular fluid that surrounds them, which is delivered by the blood. Are iodide ions transported into the thyroid cells by active transport or passive transport?
A. active transport, because the cell must pump ions from regions of low concentration to high concentration
B. active transport, because charged ions cannot diffuse through the lipid bilayer of the cell membrane
C. passive transport, because iodide ions diffuse into the cell from the surrounding fluids
D. passive transport, because charged ions are able to diffuse through the lipid bilayer of the cell membrane
Explanation:
what is the name of the the bending effect convex lenses do?
Convex lenses refract light inward toward a focal point. Light rays progress through the edges of a convex lens and are bent most.
What is it called when a convex lens bends light rays together?convex lenses are across in the middle. Rays of light that pass through the lens are conducted closer together (they converge). A convex lens is a meet lens. When parallel rays of light pass through a convex lens the refracted rays cross at one point called the principal focus.
. A convex lens is a connecting lens. When parallel rays of light pass through a convex lens the refracted rays merge at one point called the principal focus.
So we can conclude that Convex Lens. Concave Lens; It is known as a converging lens as light rays, when passed through this lens, tends to bend towards each other. It is known as a Convex Lens
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V2O5 + Ca = V + CaO balance the eqaution
Answer: The balanced equation is \(V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO\).
Explanation:
A chemical equation which contains same number of atoms on both reactant and product side is called a balanced chemical equation.
For example, \(V_{2}O_{5} + Ca \rightarrow V + CaO\)
Here, number of atoms on reactant side are as follows.
V = 2O = 5Ca = 1The number of atoms on product side are as follows.
V = 1O = 1Ca = 1In order to balance this equation, multiply Ca by 5 on reactant side. Multiply V by 2 and CaO by 5 on product side. Therefore, the equation can be rewritten as follows.
\(V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO\)
Now here, number of atoms on reactant side are as follows.
V = 2O = 5Ca = 5The number of atoms on product side are as follows.
V = 2O = 5Ca = 5Since, there are same number of atoms on both reactant and product side. So, the equation is now balanced.
Thus, we can conclude that the balanced equation is \(V_{2}O_{5} + 5Ca \rightarrow 2V + 5CaO\).
Identify the double displacement reaction
2NH3+H2SO4
Answer:
......................
nh42so4
Determine the total kilojoules in two tablespoons
The total kilojoules in two tablespoons is 836.8 kJ.
To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.
The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.
For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:
100 kcal * 4.184 kJ/kcal = 418.4 kJ
So, if we have two tablespoons of this substance, the total energy would be:
418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ
It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.
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ch4+br2 ch3br+hbr which type of reaction does this equation represent
To solve such this we must know the concept of combination reaction. Therefore, the given reaction CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr is a combination reaction.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr
The above reaction is a combination reaction. In combination reaction, more than one reactant combine to form a product. Because new chemicals are created during combination reactions, they are often referred to as synthesis.
Therefore, the given reaction is a combination reaction.
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The __________________variable is the one factor you manipulate or change in the experiment