How can you tell the difference between two clear liquids
Answers
Answer:
To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.
Explanation:
Related Questions
A homogeneous mixture is a composition of two or more
impure substances in a definite proportion, displaying non-
uniform characteristics.
TRUE
FALSE
Answers
The answer is FALSE. I did it on ck-12
PLEASE HELP
What is either broken down or released during the first stage of cellular respiration? Select two options.
glucose
oxygen
water
energy
carbon dioxide
Answers
Answer:
It is C (water) and E (carbon dioxide)
Have a nice day!
Explanation:
The first level of dna organization in a eukaryotic cell is maintained by which molecule?.
Answers
The first level of DNA organization in a eukaryotic cell is maintained by histone molecule. A histone is a protein that gives chromosomes structural support.
A kind of protein that is present in chromosomes. Histones bind to DNA, assist shape chromosomes, and regulate the expression of genes. The lengthy DNA molecules that make up each chromosome must fit inside the cell nucleus. The chromosome takes on a more compact shape as a result of the DNA wrapping around complexes of histone proteins.
Eukaryotic creatures are big and complicated because eukaryotic cells include nuclei that are encased in nuclear membranes. Eukaryotic cells are found in protozoa, fungi, plants, and mammals. A membrane-bound nucleus is a feature of eukaryotic cells. Chloroplasts can be found in plants and algae, while other membrane-bound organelles like the mitochondria and golgi apparatus are frequently seen in eukaryotic cells.
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PLEASE HELP!!!
Which of the analogies best describes a Bohr model of an atom?
A. A Bohr model is like a bowling ball because they are both solid spheres.
B.A Bohr model is like a model of the solar system because they both show orbits around a massive center
C. A Bohr model is like a string of beads because they both contain small parts that are lined up in a row.
D. A Bohr model is like a jigsaw puzzle because they are both made up of small parts that are all joined together.
Answers
Answer:
B is the Bohr model of atom
in a cryogenics (extreme cold) demonstration, a scientist takes a small, partially inflated balloon out of liquid nitrogen (at a very low temperature). As the balloon rests on the table, it begins to grow in size. explain this phenomenon.
Answers
The growth of the balloon after being taken out of liquid nitrogen is a result of the increase in temperature, which leads to an increase in the kinetic energy and speed of the gas molecules, causing them to spread out and expand, resulting in the expansion of the balloon.
The phenomenon you are describing, where a small, partially inflated balloon grows in size after being taken out of liquid nitrogen, can be explained by the principles of gas expansion due to temperature change.
When the balloon is submerged in liquid nitrogen, it is exposed to an extremely low temperature. As a result, the air molecules inside the balloon lose thermal energy and their average kinetic energy decreases. This decrease in kinetic energy causes the molecules to slow down and move closer together, leading to a decrease in pressure and volume of the gas inside the balloon.
When the balloon is removed from the liquid nitrogen and placed on the table, it starts to warm up. As the temperature increases, the air molecules regain thermal energy and their average kinetic energy rises. This increase in kinetic energy causes the molecules to move faster and spread out, leading to an increase in pressure and volume of the gas inside the balloon.
Furthermore, gases typically exhibit a property known as Thermal expansion, which means they expand when heated and contract when cooled. As the temperature of the air inside the balloon rises, the gas expands, causing the balloon to grow in size.
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When an antacid tablet dissolves in water, the fizz is due to a reaction between sodium hydrogen carbonate (sodium bicarbonate, NaHCO3) and citric acid (H₂CH₂O7).
3 NaHCO3(aq) + H₂C6H₂O7(aq) →3 CO₂(g) + 3 H₂O(l) + Na3CH₂O₂(aq)
How many moles of Na3C6H5O7 can be produced if one tablet containing 0.0217 mol of NaHCO3 is dissolved?
Answers
Therefore, 0.00723 moles of Na3C6H5O7 can be produced if one tablet containing 0.0217 mol of NaHCO3 is dissolved.
What is balanced chemical reaction?The balanced chemical equation shows that 3 moles of NaHCO3 react with 1 mole of H2C6H6O7 to produce 1 mole of Na3C6H5O7. Therefore, the number of moles of Na3C6H5O7 produced is directly proportional to the number of moles of NaHCO3.
If one tablet containing 0.0217 mol of NaHCO3 is dissolved, then according to the balanced chemical equation, the number of moles of Na3C6H5O7 produced is:
(0.0217 mol NaHCO3) x (1 mol Na3C6H5O7 / 3 mol NaHCO3) = 0.00723 mol Na3C6H5O7
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using nad and nadh (no structures needed) write out the reaction for the oxidation of methanol (ch3-oh) to formaldehyde, in which nad is the oxidizing agent. we won’t encounter this reaction, but it is a lot like ones we will.
Answers
Using NAD and NADH reaction for the oxidation of methanol CH₃OH to formaldehyde, in which NAD is the oxidizing agent and then alcohol oxidase was crystallized after purification by ammonium sulfate precipitation
Oxidation means a process in which a chemical substance changes because of the addition of oxygen
Methanol was oxidized to formaldehyde by an alcohol oxidase and the reaction are
CH₃OH+O₂ → HCOH + H₂O₂
And the cofactor found in two form of cell and NAD is an oxidizing agent and it accept the electron of other molecule and reduced and this reaction is also with H⁺ form NADH which can be used as the reducing agent to donate electron and this reaction gives alcohol oxidase was crystallized after purification by ammonium sulfate precipitation
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Please can someone help me with 1 to 13 please
Answers
Answer: I can suck you di ck
Explanation:
a compound has the formula al2x3. which one of the following could be x?
A. P
B. S
C. H
D. Cl
Answers
Based on the given compound formula Al2X3, the most likely element for X is: D. Cl. The compound with the formula Al2X3 suggests that there are two aluminum atoms and three atoms of a particular element represented by "X".
To determine which element "X" could be, we need to consider the valency of aluminum and the other elements. Aluminum has a valency of +3, which means it can bond with three other atoms to complete its valence shell. Among the given options, sulfur (S) and chlorine (Cl) have a valency of -2, while phosphorus (P) and hydrogen (H) have a valency of -3 and +1, respectively.
Therefore, the correct answer would be D. Cl, as it can form a compound with Al in the ratio of 2:3 by gaining three electrons to attain a noble gas configuration. The compound would be Al2Cl3, which is aluminum chloride, a well-known and stable compound. The other options (A. P, B. S, C. H) do not form stable compounds with aluminum in a 2:3 ratio.
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For the following molecule, what will be the ratio of the M to M+6 peaks (M:M+6, respectively)? CI Br Cl. multiple choice O 1:1 O 10:1 O 27:1 O 3:1 O 12.5:1
Answers
For the following molecule, the ratio of the M to M+6 peaks (M:M+6, respectively) for the formula CI Br Cl is: 3:1.
This is because the molecule contains only one isotope of Chlorine (Cl) which has atomic mass 35.5.
The molecular weight of the molecule will be the sum of the atomic weights of Chlorine, Bromine, and Iodine.
Therefore, molecular weight = 35.5 + 79.9 + 126.9 = 242.3 g/mol
The ratio of M to M+6 peaks can be calculated using the formula:
M: M+6 = [2n+1] : [3n+1] where n is the number of carbons in the molecule.
From the given formula, there are no carbons in the molecule, so n=0.
So M: M+6 = [2(0)+1]: [3(0)+1] = 1:1
However, since there is one isotope of Chlorine in the molecule, the ratio will be affected.
The molecular ion (M) peak will be split into two peaks: M and M+2, with an intensity ratio of 3:1.
The peak for M+6 will also be split into two peaks: M+6 and M+8, but with a much lower intensity than the M:M+2 peaks. Therefore, the ratio of M to M+6 peaks for the formula CI Br Cl is 3:1.
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which of the following statements correctly describe resonance structures? select all that apply.
Molecules that require more than one inwis structure to accurately describe them.
The actual molecule is an average of the Lewis structure.
Moleculos that change back and forth between several different forms Molecules that spin so that double bends paint in ditferent dircctions
Molecules that react with other molecuies and form a hybrid
Answers
The statements correctly describe resonance structures is The actual molecule is an average of the Lewis structure. Therefore, option B is correct.
What is Lewis structure ?The representations known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.
In comparison to separate resonance structures, the resonance hybrid is more stable. The movement of a charge between two or more atoms is frequently represented by resonance structures. These atoms have a more evenly distributed charge, which makes it more stable.
Thus, option B is correct.
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Which of the following elements can exist in more than one form in the same
state?
neon
iodine
carbon
iron
Answers
Answer:
neon
Explanation:
it comes in different colours
how can you tell how reactive an element is?
Answers
01:45:05 Which statement describes how diffusion works? Molecules always move from inside of the cell to outside of the cell. Molecules always move from areas of high concentration to low concentration. Molecules always move from areas of low concentration to high concentration. Molecules always move from of outside the cell to inside of the cell.
Answers
Answer:
Molecules always move from areas of high concentration to low concentration.
Explanation:
The correct answer to how diffusion works would be that molecules always move from areas of high concentration to low concentration.
Diffusion is generally defined as the movement of molecules - solid, liquid, or gases - from the region of higher concentration of the molecule to the region of lower concentration of the same molecule. The net movement of molecules continues until an equilibrium is established between the two sides.
Nitrogen dioxide, NO2, an air pollutant, dissolves in rainwater to form a dilute solution of nitric acid. The equation for the reaction is
3NO2(g) + H2O(l) → 2HNO3(l) + NO(g)
Calculate ∆So for this reaction in J/K.
Answers
Nitrogen dioxide, NO2, an air pollutant, dissolves in rainwater to form a dilute solution of nitric acid. The equation for the reaction is 3NO2(g) + H2O(l) → 2HNO3(l) + NO(g). So, the standard entropy change for the reaction is -536.0 J/K.
To calculate ∆So for the reaction, we need to determine the standard entropy change (∆So) for each of the products and reactants, and then use them in the equation:
∆So = ΣS°(products) - ΣS°(reactants)
The standard entropy values can be found in a thermodynamics table, and for this reaction they are:
S°(NO₂(g)) = 239.9 J/K
S°(H₂O(l)) = 69.9 J/K
S°(HNO₃(l)) = 146.8 J/K
S°(NO(g)) = 240.0 J/K
Substituting these values into the equation, we get:
∆So = [2(146.8 J/K) + 240.0 J/K] - [3(239.9 J/K) + 69.9 J/K]
∆So = 293.6 J/K - 829.6 J/K
∆So = -536.0 J/K
Therefore, by calculating we can say that the standard entropy change for the reaction is -536.0 J/K.
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Which would easily give up more electrons during bonding? Use Periodic Table.
Answers
Answer:
I'm pretty sure that it's lithium because it gives up one of their 3 electrons, so li
Two grams of sodium chloride (table salt) were completely dissolved in a glass of water. How would you classify the resulting material?
Group of answer choices
As a mixture.
As a salt compound
As a pure substance
As an element
Answers
Answer:
This is a mixture.
Explanation:
While you can no longer see the salt when it's dissolved, it's still there! It's just in tiny, tiny, invisible to the eye molecules. It's now a mixture of H20 molecules and NaCl molecules in a solution :)
The water doesn't bond to the salt, so it's not a compound.
It's not just one element, it's a mixture of many!
It's not a pure substance since it's NaCl AND H2O.
In the reaction, 6CO2 + 6H2O →C6H12O6 + 6O2, which side should energy be placed on?
A)The left side, this is an endergonic reaction.
B)The left side, this is an exergonic reaction.
C)The right side, this is an endergonic reaction.
D)The right side, this is an exergonic reaction.
E)Neither side, the reaction is in equilibrium.
Answers
A) The left side, this is an endergonic reaction.
2(t. A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6"C. Determine thetemperature at which the volume of the gas is 3.45 L.a) 309 K b) 281 K e) 20,6 K d) 294 K e) 326 K
Answers
They tell us that the pressure of the gas is constant and the temperature and volume vary. If we assume that the gas behaves like an ideal gas, we can apply Charles's law, which tells us:
\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)where,
V1 is the initial volume, 3.62L
T1 is the initial temperature, 21.6°C=294.75K
V2 is the final volume, 3.45L
T2 is the final temperature, in Kelvin
Now, we clear T2 and replace the known data:
\(T_2=V_2\times\frac{T_1}{V_1}\)\(T_2=3.45L\times\frac{294.75K}{3.62L}=281K\)The temperature at which the volume of the gas is 3.45 L will be 281K
Answer. b) 281K
Lemon juice, pH = 2.75 Calculate [H +] and [OH﹘]
Answers
Answer
[H⁺] = 1.778 x 10⁻³ M
[OH⁻] = 5.624 x 10⁻¹² M
Explanation
Given:
The pH of the lemon juice = 2.75
What to find:
The [H⁺] and [OH⁻] of the lemon juice.
Step-by-step solution:
pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14.
The equation for calculating pH is
\(pH=-\log_[H^+]\)Putting the values of pH as 2.75 into the equation above, the [H⁺] of the juice can be calculated as follows:
\(\begin{gathered} 2.75=-\log_[H^+] \\ \\ Multiply\text{ }all\text{ }through\text{ }by\text{ }- \\ \\ \log_[H^+]=-2.75 \\ \\ .[H^+]=10^{-2.75} \\ \\ .[H^+]=1.778\times10^{-3}M \end{gathered}\)The [H⁺] = 1.778 x 10⁻³ M
The [H⁺] and [OH⁻] of an aqeuous solution is related by
\(\begin{gathered} [H^+]\times[OH^-]=1.0\times10^{-14} \\ \end{gathered}\)So, putting [H⁺] = 1.778 x 10⁻³ M into the relation, we have [OH⁻] of the lemon juice to be:
\(\begin{gathered} 1.778\times10^{-3}\times[OH^-]=1.0\times10^{-14} \\ \\ Divide\text{ }both\text{ }sides\text{ }by\text{ }1.778\times10^{-3} \\ \\ \frac{1.778\times10^{-3}\times[OH^-]}{1.778\times10^{-3}}=\frac{1.0\times10^{-14}}{1.778\times10^{-3}} \\ \\ .[OH^-]=5.624\times10^{-12}M \end{gathered}\)Therefore, [H⁺] = 1.778 x 10⁻³ M and [OH⁻] = 5.624 x 10⁻¹² M
Three blocks are shown: Block A has mass 2 kilograms, length 5 centimeters, height 2 centimeters, and width 1 centimeter. Block B has mass 2 kilograms, length 1 centimeter, height 5 centimeters, and width 2 centimeters. Block C has mass 3 kilograms, length 5 centimeters, height 1 centimeter, and width 2 centimeters. Which statement is correct? Block A has the greatest density. Block B has the greatest density. The density of Block A is equal to the density of Block B. The density of Block B is equal to the density of Block C.
Answers
The correct answer to the question is: The density of Block A is equal to the density of Block B.
The density of an object is defined as the mass per unit volume of the object. Mathematically, it is expressed as:
Density = mass / volumeTo know which option is correct, we shall determine the density of block A, B and C.
For Block A:Mass of A = 2 Kg
Length = 5 cm
Height = 2 cm
Width = 1 cm
Volume = Length × Width × HeightVolume = 5 × 1 × 2
Volume of A = 10 cm³
Density of A =?Density = mass / volume
Density = 2 / 10
Density of A = 0.2 Kg/cm³For Block B:Mass of B = 2 Kg
Length = 1 cm
Height = 5 cm
Width = 2 cm
Volume = Length × Width × HeightVolume = 1 × 2 × 5
Volume of B = 10 cm³
Density of B =?Density = mass / volume
Density = 2 / 10
Density of B = 0.2 Kg/cm³For Block C:Mass of C = 3 Kg
Length = 5 cm
Height = 1 cm
Width = 2 cm
Volume = Length × Width × HeightVolume = 5 × 2 × 1
Volume of C = 10 cm³
Density of C =?Density = mass / volume
Density = 3 / 10
Density of C = 0.3 Kg/cm³SUMMARYDensity of A = 0.2 Kg/cm³
Density of B = 0.2 Kg/cm³
Density of C = 0.3 Kg/cm³
From the above calculations, we obtained the following:
1. The density of block A and B are equal.
2. Block C has the highest density.
Thus, the correct statement is: The density of Block A is equal to the density of Block B.
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what isotope produces boron-11 when it emits a positron
Answers
Answer:
boron-11
Explanation:
When an isotope emits a positron and produces boron-11, it is the isotope beryllium-11 (Be-11).
Beryllium-11 (Be-11) is an unstable isotope of beryllium. It has a proton number of 4, which means it normally has four protons in its nucleus. However, in this case, it undergoes a process known as positron emission.
During positron emission, one of the protons in the nucleus of beryllium-11 transforms into a neutron. This conversion process releases a positron (a positively charged electron) and results in the formation of boron-11 (B-11), which has five protons and six neutrons in its nucleus.
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Consider the following equilibrium:
4nh3(g) + 3o2(g) right arrow 2n2(g) + 6h2o(g) 1531 kj
the concentrations of the reactants would decrease after ammonia was added to the system.
a. true
b. false
Answers
Consider the following equilibrium:
4NH₃ (g) + 3O₂ (g) ⇄ 2N₂ (g) + 6H₂O (g) + 1531 kJ
The given statement is True, because
According to Le Ch's Principle:
Systems that have attained the state of chemical equilibrium will tend to maintain their equilibrium state.
External factors such as the addition of products and reactants result in the disruption of the equilibrium state.
we expect the system to shift to the direction that offsets the change in concentration.
This results in the state of chemical equilibrium to be reestablished.
Hence, The statement is true,
The addition of more ammonia (a reactant) would offset the state of equilibrium.To restore chemical equilibrium, the system must consume the excess reactants to form more products.A shift to favor the products side occurs.To learn more about equilibrium here
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An atom loses 1 electron, this is the new electron configuration: [Rn]7s1
What is the element symbol of this positively charged atom?
Answers
At what temperature would a 1.30 m NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86 ∘C/m .
Answers
Answer:
-4.59°C
Explanation:
Let's see the formula for freezing point depression.
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
Kf = Freezing constant. For water if 1.86°C/m
m = molality (moles of solute in 1kg of solvent)
i = Van't Hoff factor.
0°C - Freezing T° of solution = 1.86°C /m . 1.30m . 1.9
Freezing T° of solution = - (1.86°C /m . 1.30m . 1.9)
Freezing T° of solution = - (1.86°C/m . 1.30m . 1.9) → -4.59°C
NaCl → Na⁺ + Cl⁻
how to calculate mass percent of acetic acid in vinegar
Answers
The mass percent of acetic acid in vinegar can be calculated by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100.
To calculate the mass percent of acetic acid in vinegar, you need to determine the mass of acetic acid and the total mass of the vinegar solution. Here are the steps to follow:
1. Obtain the molar mass of acetic acid (CH3COOH), which is approximately 60.05 g/mol.
2. Measure the mass of vinegar used in the calculation.
3. Prepare a known volume of vinegar solution and record the mass of the solution using an analytical balance.
4. Determine the mass of acetic acid in the solution by subtracting the mass of the empty container from the mass of the container with the vinegar solution.
5. Calculate the mass percent of acetic acid by dividing the mass of acetic acid by the total mass of the vinegar solution and multiplying by 100:
Mass percent of acetic acid = (mass of acetic acid / total mass of vinegar solution) x 100
The resulting value will give you the mass percent of acetic acid in the vinegar solution. It represents the percentage of acetic acid by mass in the total solution.
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How many molecules of glucose,
C6H12O6, are present in 240.0 grams?
[?] x 10 molecules C6H12O6
Enter the coefficient in the green blank and the
exponent in the yellow blank. Report your answer
to the appropriate number of significant figures!
Coefficient (green)
Exponent (Yellow)
Enter
Answers
Answer:
The molecular weight of glucose (C6H12O6) is 6(12.01) + 12(1.01) + 6(16.00) = 180.18 g/mol.
So, the number of moles of glucose present in 240.0 g can be calculated as follows:
n = m/M = 240.0 g / 180.18 g/mol = 1.33 mol
And the number of molecules of glucose can be calculated as follows:
N = n x Avogadro's constant = 1.33 mol x 6.022 x 10^23 molecules/mol = 7.98 x 10^23 molecules
Therefore, the number of molecules of glucose present in 240.0 g is 7.98 x 10^23 molecules, rounded to the nearest whole number.
So, the coefficient is 7.98 and the exponent is 23.
Explanation:
Difference between tetrahedral void and octahedral void.
Answers
Tetrahedral voids
Tetrahedral voids It can be found in substances having a tetrahedral arrangement in their crystal system. Tetrahedral voids are unoccupied empty spaces present in substances having a tetrahedral crystal systemFour is the coordination number of the tetrahedral void.Tetrahedral voids can be observed in the edges of the unit cell.Octahedral voids
It can be found in substances having an octahedral arrangement in their crystal systemOctahedral voids are unoccupied empty spaces present in substances having an octahedral crystal system. Six is the coordination number of the Octahedral void. Octahedral voids can be observed in the center of the unit cell.A chemist carefully measures the amount of heat needed to raise the temperature of a sample of from to. The experiment shows that of heat are needed. What can the chemist report for the molar heat capacity of ? round your answer to significant digits.
Answers
Answer:
Are there any options or starting points for this question?
Explanation:
The electrolyte that is used to make Hypochlorous Acid is made from Sodium Chloride (NaCl). the bottle says that the electrolyte solution contains 25% sodium chloride. If 2.4 ounces of the solution is added to the half gallon to prepare for the reaction. How many total grams of sodium chloride are used in the reaction. If the reaction produces 1100 PPM of HOCl (hypocholorus acid) how many grams of Hypocholrous are made? Do you think all the NaCl was converted to HOCl? or we can brew one more time and get more HOCl. If all of the NaCl converts to HOCl what would be the maximum possible PPM of the disinfectant
Answers
Answer:
63.9 grams. Yes, the Nacl was converted. Maximum possible ppm is 540ppm.
Explanation:
I this is college level chemistry not regular high school chem.
Answer:2
Explanation:
it is it do not ask questions