Naming compoundsPb3(AsO4)4

Potassium trifluoroacetate is the salt of a weak acid (trifluoroacetic acid) and a strong base (potassium hydroxide). In water it will dissociate into its ions.

KC₂F₃O₂ ------> K⁺ + C₂F₃O₂⁻

The trifluoroacetate ion is the conjugate base of a weak acid:

C₂F₃O₂⁻ + H₂O <-----> C₂F₃O₂H + OH⁻

The dissociation constant of this conjugate base will be:

Kb = [C₂F₃O₂H] * [OH⁻]/[C₂F₃O₂⁻]

I searched for the value of the Ka for the trifluoroacetatic acid. With this value we can find the Kb for the trifluoroacetate.

Ka = 1

Ka * Kb = 1 * 10^(-14)

Kb = 1 * 10^(-14)/1

Kb = 1 * 10^(-14)

So first we will have to find the concentration of OH⁻ and then we will be able to find the concentration of H+ and finally the pH.

We have to use the ICE table.

C₂F₃O₂⁻ + H₂O <-----> C₂F₃O₂H + OH⁻

I 5.43 0 0

C -x +x +x

E 5.43 - x x x

The initial concentration of the trifluoroacetate ion is 5.43, then some moles of it will convert into moles of C₂F₃O₂H and OH⁻. And finally we found the equilibrium concentrations that we can replace of the expression of the Kb.

Kb = [C₂F₃O₂H] * [OH⁻]/[C₂F₃O₂⁻]

Kb = x * x /(5.43 - x)

Kb = x²/(5.43 - x)

We can replace the Kb for the value that we found and solve this quadratic equation for x.

1 * 10^(-14) = x²/(5.43 - x)

1 * 10^(-14) * (5.43 - x) = x²

x² + 1 * 10^(-14) x - 5.43 * 10^(-14) = 0

This quadratic equation has two roots. We will use the positive one since it is a concentration.

x₁ = 2.33 * 10^(-7) x₂ = - 2.33 * 10^(-7)

The concentration of OH- in the equilibrium is x. We can determine the pOH.

[OH-]eq = x₁

[OH-]eq = 2.33 * 10^(-7)

pOH = - log [OH-]

pOH = - log (2.33 * 10^(-7))

pOH = 6.63

Finally we can find the pH using that value:

pH + pOH = 14

pH = 14 - pOH = 14 - 6.63

pH = 7.37

Answer: the pH of a 5.43 M solution of potassium trifluoroacetate is 7.37 supposing that ka of trifluoroacetic acid is 1.

One measure of solubility is concentration in grams per liter concentration of copper(II) ions, in grams per liter, measured in a 0.200 L sample of water in which 0.00026 g of copper(II) ions are present is 0.0013 g/L means 1.3×10⁻³g/L

Concentration is defined as mass per unit volume

Here given data is

Volume = 0.200 L

Mass = 0.00026 g

We have to calculate concentration = ?

Concentration = mass/volume

Concentration =  0.00026 g/0.200 L

Concentration = 0.0013g/L = 1.3×10⁻³g/L

1.3×10⁻³g/L concentration of copper(II) ions, in grams per liter, measured in a 0.200 L sample of water in which 0.00026 g of copper(II) ions are present

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Structural isomers have the same formula, but they have different bonds, that's why they can have the same number of carbon atoms.

Answer:

a. Student A has results that are neither precise nor accurate.

b. Student B has results that are both precise and accurate.

c. Student C has results that are precise but not accurate.

Explanation:

First, let's remember the concepts of accuracy and precision:

Accuracy is a measure of how close a measurement is to the correct or accepted value of the quantity being measured.

Precision is a measure of how close a series of measurements are to one another.

You can see this better in the following picture:

Based on this logic, you can note that:

- The results of Student A are not accurate and are not precise.

- The results of Student B are very close to each other which is precise and in turn, they are close to the real value which is very accurate.

- The results of Student C are very close to each other which is precise but it isn't close to the real value, so it isn't accurate.

The answers would be:

a. Student A has results that are neither precise nor accurate.

b. Student B has results that are both precise and accurate.

c. Student C has results that are precise but not accurate.

Answer:

2, 3, 1, 3.

Explanation:

Remember that a balanced chemical equation is when we have the same number of elements for reactant and product side.

Let's see the unbalanced equation:

You can note that we have:

You can realize that we have Fe, S, and O unbalanced, but if we put '2' moles beside Fe, we will balance Fe, like this:

Now, if we put '3' moles beside H2SO4 we will balance S and O, obtaining 3 moles of S, and 12 moles of O for both sides:

But H is unbalanced because on the left side we have 6 hydrogens but on the right side we have 2 hydrogens, so if we put '3' moles beside H2, we obtain the balanced chemical equation:

The order of the coefficients is 2, 3, 1, 3.

Answer:

2,3,1,3

Explanation:

I took the test

ANSWER

An increased temperature will shift the equilibrium to the right and the pressure of water will be decreased.

A decreased in temperature will shift the equilibrium to the left and the pressure of the

STEP-BY-STEP EXPLANATION:

Firstly, we need to write out the balanced equation of the chemical equation.

What is chemical equilibrium?

Chemical equilibrium is the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactant and products occurs.

According to the balanced equation, it shows that the reaction is an endothermic reaction. This means that heat was absorbed from the surroundings during the reaction.

To study the change in the equilibrium shift, we need to apply Le Chatelier's principle.

Le Chatelier's principle states that when an external constraint such as (temperature, pressure, or concentration) is imposed on a chemical system in equilibrium, the equilibrium of the system shift in order to annul or neutralize the effect of the constraints.

When the temperature of the chemical system is increased, the products side of the system will be favored. This is because an increase in temperature will lead to a faster collision between the two reactants, hence, producing more methane. Therefore, the equilibrium will shift to the left.

When the temperature is increased, the equilibrium will shift to the right.

The pressure of water will be decreased when the temperature is increased. This is because has no effect on the equilibrium system

When the temperature is lowered, the reactants side is favored and the equilibrium will shift to the left.

Looking at the balanced equation critically, the number of moles at the reactant side is equal to the number of moles at the sides of the product.

When the temperature is lowered, the pressure of methane gas will be decreased

answer and explanation

in order to determine the equilibrium constant we have to use the ICE method

the initial concentration of PCl5 is given as 0.300M and at this stage, the concentration of PCl3 and Cl2 are zero

the equilibrium constant is 0.5

So,

The compound:

Can be called as:

Phosphorous acid

ANSWER

The mass of NaCl is 7.5 grams

EXPLANATION

Given that;

The volume of the solution is 0.625L

The molarity of the solution is 0.207 M

Follow the steps below to find the mass of NaCl

Step 1; Find the number of moles using the below formula

Step 2; Find the mass of NaCl using the below formula

Recall, that the molar mass of NaCl is 58.44g/mol

Therefore, the mass of NaCl is 7.5 grams

Answer:

The density of the gas will increase.

Explanation:

From the Charles's law of Ideal gases, we know that, if the pressure is constant, the behavior of the gas will be represented like:

So, if the temperature of a gas is increased, the volume of the gas will decrease, because temperature and volume (in the charles's law, that is with constant pressure) are inversely proportional.

Now, to analyze what happens with the density, we can see the density formula:

So, if the volume of the gas decrease, the density of the gas will increase, because in the density formula, volume and density are inversely proportional.

Finally, if the temperature of a gas is increased and the pressure is held constant, the density of the gas will increase.

Answer:

Iodine - > Fluorine, Bromine

Barium - > Beryllium, Magnesium

Iron - > Hassium, Osmium

Explanation:

Chemistry => Stoichiometry => Limiting reactant

The limiting reactant corresponds to the reactant that produces the least amount of moles of products, that is, it will be the reactant that theoretically reacts completely.

To find the limiting reactant we will first calculate the moles of each reactant. For that, we divide the given mass by the respective molar mass of the compounds.

Molar Mass Al = 26.98g/mol

Molar Mass CuCl = 98.999g/mol

Moles Aluminum

Moles Copper Chloride

Now, to find the limiting reactant we divide the moles found in each compound between the stoichiometry coefficient from the balanced equation.

So, we will have:

The compound with the smallest quotient will be the limiting reactant.

So, the limiting reactant will be CuCl

Answer: B. CuCl

The balanced molecular chemical equation for the reaction of solid lithium with aqueous chromium(III) acetate is given below:

3 Li (s) + Cr(CH₃CO₂)₃ (aq) ---> 3 LiCH₃CO₂ + Cr(s)

Chemical reactions are reactions that involve the rearrangement of atoms of the substances reacting such that new substances are formed.

Chemical reactions are usually represented using chemical equations.

Chemical equations can be written as molecular equations or as ionic equations.

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The number of moles in 16.23 liters of hydrogen sulfide h2s gas at STP is   0.7245 moles.

Standard temperature and pressure (STP) refer back to the nominal situations within the surroundings at sea stage. these conditions are zero degrees Celsius and 1 ecosystem (atm) of pressure.

A mole is a completely important unit of size that chemists use. A mole of something manner you have got of that aspect, like how having a dozen eggs approach you to have twelve eggs. Chemists should degree the use of moles for very small such things as atoms, molecules, or different debris.

The mole, symbol mol, is the unit of quantity of substance inside the worldwide machine of gadgets. the amount quantity of the substance is a degree of what number of elementary entities of a given substance is in an item or pattern. The mole is defined as containing exactly 6.02214076×10²³ simple entities

calculation:-

mole at STP = volume in liters/22.4

                   =  16.23 liters /22.4

                  = 0.7245 moles.

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The molecular

Step-by-step explanation:

Molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts. The numeric subscripts only tell us the number of atoms of the constituent elements

Molecular mass of water can be calculated as follows

H2O

The molar mass of hydrogen is 1

The molar mass of oxygen is 16

Since water has two atoms of hydrogen and 1 atom of oxygen

Molecular mass of water = 2(1) + 1(16)

Molecular mass of water = 2 + 16

Molecular mass of water = 18g/mol

Hence, the molecular mass of water is 18g/mol

The expression used to calculate the mass percent concentration is: % (m/m) = (mass of solute) / (mass of solution (solute + solvent)) x 100.

First let's transform mL into grams of water:

1 g of water ---- 1 mL of water

x g of water ---- 170 mL of water

x = 170 g of water

Now let's calculate the mass of solution:

mass of solute = 30 g of NaCl

mass of solvent = 170 g of water

solute + solvent = 30 + 170 = 200 g

% (m/m) = (mass of solute) / (mass of solution (solute + solvent)) x 100.

% (m/m) = (30g/200g) x 100.

% (m/m) = 15.0%

Answer: 15.0%

In order to find the percentage of an element within a compound, we need to have the mass for this element and also the mass of the whole compound, and the masses are:

H = 1.008 g/mol or amu

and we have 3 H in the compound, therefore = 3.024 g/mol or amu

NH3 = 17.031 g/mol

Now we know that 17.031 is the total mass, so we will call it 100%

17.031 g/mol = 100%

3.024 g/mol = x %

x = 17.75% of H in NH3

Answer:

Explanation:

Here, we want to describe the correct Lewis diagram for the molecule

For the molecule, we will have a double bond between the two central carbon atoms. Then, we will have 2 single bonds from each carbon atom to the hydrogen atoms.

Thus, the correct answer choice here is 2 single bonds to carbon and 1 double bond to a carbon

The correctly drawn Lewis structure for CH₂CH₂ will have 2 single bonds to carbon and one double bond to carbon. Therefore, the correct option is option 2.

A Lewis structure is a representation of a molecule or ion that shows the arrangement of atoms, the bonding between them, and the distribution of valence electrons. It is a simplified way to visualize the electronic structure of a compound.

In a Lewis structure, atoms are represented by their chemical symbols, and valence electrons are represented as dots or lines. Dots are placed around the atomic symbols to indicate non-bonding electrons, and lines represent covalent bonds between atoms. Lewis structures help in understanding the bonding and molecular geometry of a compound, as well as predicting its chemical behavior.

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The first thing we do is to verify that the equation is balanced. We are going to count the atoms of each element on each side of the reaction.

Reagents side:

Carbon (C) = 5 atoms.

Hydrogen (H) = 12 atoms.

Oxygen (O) = 16 atoms.

Products side:

Carbon (C) = 5 atoms.

Hydrogen (H) = 12 atoms.

Oxygen (O) =16 atoms.

We have the same number of atoms on both sides of the reaction. So, the reaction is balanced. Now, we must determine which is the limiting reagent.

For each mole of C5H12 that reacts, 8 moles of oxygen are needed and 5 moles of CO2 and 6 moles of H2O are produced.

So, if we have 2.5 moles of C5H12 we will need:

Moles of O2 = 2.5 moles of C5H12 x 8 = 20 moles of oxygen.

We only have 12 moles of oxygen, we don't have enough moles to react to 2.5 moles of C5H12. So oxygen is the limiting reagent. So we will calculate based on the number of moles of oxygen.

So, for every 8 moles of oxygen 1 mole of C5H12 reacts, if we have 12 moles of the oxygen we divide this amount by 8 to know how many moles of C5H12 react.

Moles of C5H12 that reacts = 12 moles of oxygen / 8 = 1.5 moles of C5H12

For each mole of C5H12 6 moles of H2O are produced. So the number of moles produced will be:

Moles of H2O produced= 1.5 moles of C5H12 x 6 = 9 moles of H2O

So, the maximum amount of H2O that can be produced is 9 moles.

ANSWER

EXPLANATION:

A single replacement reaction is also called a single displacement reaction.

A single replacement reaction is a type of reaction where one element is substituted for another element in a compound during a chemical reaction.

Below reaction is an example of a single replacement reaction

From the given options, you will see that the reaction between Zn and H2SO4 is a single replacement reaction

Zn will displace H2 because it is more reactive than hydrogen

Hence, the correct option is D

Firstly, what you need to understand is that boiling points reflect the intermolecular attractive forces within the sustance.

The stronger the intermolecular forces, the lower the vapor pressure of the substance and the higher the boiling point.

In this case, vegetable oil has stronger intermolecular forces, these forces are difficult to break, which then leads to increased/higher temperatures needed to break them. That is why vegetable oil has a boiling point of approximately 300 degrees celsius.

Maple syrup has a lower boiling point because its intermolecular forces are less stronger compared to vegetable oil. Not a lot of energy is required to break the intermolecular bonds, thus lower boiling temperature.

Answer:

Explanations:

1) According to the first question, we are to find the molar mass of Na₂SO₄.

Find the molar mass of each element present on the compound

• Molar mass of Sodium (Na) = 23g/mol

• Molar mass of sulfur (S) = 32g/mol

• Molar mass of Oxygen (O) = 16g/mol

Get the molar mass of Na₂SO₄.

Therefore the molar mass of Na₂SO₄ is 142g/mol

2) The formula for calculating the number of moles of the compound Na₂SO₄ is expressed as:

Given the following parameters:

• Molar concentration = 0.202M = 0.202mol/L

• Volume = 784mL= 0.784L

Substitute the given parameters into the formula:

Hence the number of Na₂SO₄ needed is 0.1584moles.

Answer:

false trust me gang^^^

Explanation:

In this question, we have to find the molar concentration of the acid, and the question already provides us with the formula and each required data:

MaVa = MbVb

We have:

Ma = ?

Va = 100 mL

Mb = 1.0 M

Vb = 25 mL

Now we add these values into the formula:

Ma * 100 = 1 * 25

100Ma = 25

Ma = 25/100

Ma = 0.25 M

So,

First of all, let's remember what physical and chemical changes are.

A physical change occurs when there's changes in the size or shape of matter. Changes of state, for example, from solid to liquid or from liquid to gas, are also physical changes. In this kind of change, the composition of the matter doesn't change.

A chemical change occurs when a substance combines with another to form a new substance, and the composition of the matter changes.

Now that we know what these changes are, we could give some examples of a physical change in cooking, for example:

1. Suppose we want to serve a freezed drink, like a popsicle. For this, we could freeze a fruit juice. This is a physical change because the composition of the juice changes from liquid to solid.

2. Suppose we want to serve pasta. We need to boil the pasta to make it soft, which is a physical change clearly.

3. Suppose we want to serve meat but this is freezed, so, we need to thaw it to start cooking, which is a physical change.

Alkanes are paraffins and that means they don't react a lot. SO when potassium permanganate solution is introduced to alkanes, it will not react with KMnO4 & the pink color of the solution shall persist as there is no change in the reaction.

Alkanes do not react with potassium permanganate solution.

Alkanes are the least reactive type of compound. Alkanes are saturated hydrocarbons that are slightly stable due to the presence of only single bonds. Double bonds are absent in them. Two important reactions they undergo are combustion, which is the reaction with oxygen and halogenation, and which is the reaction with halogens. Potassium permanganate is a potent oxidizing agent that dissolves in water to give the purple solution.

Alkanes do not react with potassium permanganate solution because potassium permanganate is an oxidizer and alkanes have no functional groups such as double bonds that can be further oxidized. Thus, alkanes do not react with potassium permanganate.

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According to the given graph, at 30 degrees, the solution is saturated with 200g of solute per 100mL of water.

It means that if we have 150 grams of solute:

75mL should be used to have a saturated solution.

Answer

D) mass

Explanation

The density of a substance is a ratio of its mass to volume.

Therefore, density is the ratio of a substance's mass to its volume.

The correct answer is option D) mass

First, let's count down the number of carbon. There are six carbon, so the name have "hex"

There are no double or triple bonds, sou hexane.

The compound is a cyclo, so cyclohexane

There are 2 chlorines, one in position 1 and other in position 2 of the cyclo.

The right name is:

1,2-Dichlorocyclohexane

Answer:

Na2S2O3.

Explanation:

What is given?

If we suppose that the compound has a mass of 100 g:

Mass of Na = 29.1 g,

Mass of S = 40.5 g,

Mass of O = 30.4 g,

Molar mass of Na = 23 g/mol,

Molar mass of S = 32 g/mol,

Molar mass of O = 16 g/mol.

Step-by-step solution:

First, we have to convert all the given masses of each element to moles using their respective molar mass, like this:

The next step is to divide each number of moles by the least number of moles obtained, which in this case is 1.27, as follows:

Remember that we need to have the number of moles of each element as integers, so if we multiply each number of moles of each element by 2, we will obtain:

We would have 2 mol of Na, 2 mol of S, and 3 mol of O, so the empirical formula is Na2S2O3