Chemistry Review Test #3

What is the mass of silver in 3.4 g AgNO? a. 0.025 g c. 2.2 g b. 0.64 g d. 3.0 g

a. 0.025 g

Calculate the number of moles of AlO that are produced when 0.60 mol of Fe is produced in the following reaction. 2Al(s) + 3FeO(s) --> 3Fe(s) + Al₂O₃(s) a. 0.20 mol c. 0.60 mol b. 0.40 mol d. 0.90 mol

a. 0.20 mol

What are the coefficients that will balance the skeleton equation below? AlCl₃ + NaOH ---> Al(OH)₃ + NaCl a. 1, 3, 1, 3 c. 1, 1, 1, 3 b. 3, 1, 3, 1 d. 1, 3, 3, 1

a. 1, 3, 1, 3

The molar volume of a gas at STP occupies ____. a. 22.4 L c. 1 kilopascal b. 0C d. 12 grams

a. 22.4 L

How many moles of silver atoms are in 1.8 10 atoms of silver? a. 3.0 x 10⁻⁴ c. 3.0 x 10² b. 3.3 x 10⁻³ d. 1.1 x 10⁴⁴

a. 3.0 x 10⁻⁴

Which of the following is NOT an empirical formula? a. C₂N₂H₈ c. BeCr₂O₇ b. C₃H₈O d. Sb₂S₃

a. C₂N₂H₈

The lowest whole-number ratio of the elements in a compound is called the ____. a. empirical formula c. binary formula b. molecular formula d. representative formula

a. empirical formula

The mass of a mole of NaCl is the ____. a. molar mass c. molecular mass b. atomic mass d. gram atomic mass

a. molar mass

In the activity series of metals, which metal(s) will displace hydrogen from an acid? a. only metals above hydrogen c. any metal b. only metals below hydrogen d. only metals from Li to Na

a. only metals above hydrogen

All of the following are equal to Avogadro's number EXCEPT ____. a. the number of atoms of bromine in 1 mol Br₂ b. the number of atoms of gold in 1 mol Au c. the number of molecules of nitrogen in 1 mol N₂ d. the number of molecules of carbon monoxide in 1 mol CO

a. the number of atoms of bromine in 1 mol Br

How many moles of H₃PO₄ are produced when 71.0 g P₄O₁₀ reacts completely to form HPO? P₄O₁₀(s) + 6H₂O(l) ---> 4H₃PO₄ (aq) a. 0.063 5 mol c. 4.00 mol b. 1.00 mol d. 16.0 mol

b. 1.00 mol

When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction? 4Fe(s) + 3O₂(g) → 2Fe2O₃(s) a. 1.2 mol c. 2.4 mol b. 1.8 mol d. 3.2 mol

b. 1.8 mol

What is the volume, in liters, of 0.500 mol of CH gas at STP? a. 0.0335 L c. 16.8 L b. 11.2 L d. 22.4 L

b. 11.2 L

Which of the following is an INCORRECT interpretation of the balanced equation shown below? 2S(s) + 3O₂(g) → 2SO₃(g) a. 2 atoms S + 3 molecules O → 2 molecules SO b. 2 g S + 3 g O → 2 g SO c. 2 mol S + 3 mol O → 2 mol SO d. none of the above

b. 2 g S + 3 g O → 2 g SO

How many moles of tungsten atoms are in 4.8 10 atoms of tungsten? a. 8.0 x 10² moles c. 1.3 x 10⁻¹ moles b. 8.0 x 10¹ moles d. 1.3 x 10⁻² moles

b. 8.0 x 10¹ moles

The product of a combination reaction is Ba(OH). If one of the reactants is HO, what is the other reactant? a. Ba₂O c. BaH b. BaO d. BaO₂

b. BaO

Which of the following compounds have the same empirical formula? a. CO₂ and SO₂ c. C₄H₁₀ and C₁₀H₄ b. C₇H₁₄ and C₁₀H₂₀ d. C₆H₁₂ and C₆H₁₄

b. C₇H₁₄ and C₁₀H₂₀

What is true about the molar mass of chlorine gas? a. The molar mass is 35.5 g. b. The molar mass is 71.0 g. c. The molar mass is equal to the mass of one mole of chlorine atoms. d. none of the above

b. The molar mass is 71.0 g.

When two substances react to form products, the reactant which is used up is called the ____. a. determining reagent c. excess reagent b. limiting reagent d. catalytic reagent

b. limiting reagent

A catalyst is ____. a. the product of a combustion reaction b. not used up in a reaction c. one of the reactants in single-replacement reactions d. a solid product of a reaction

b. not used up in a reaction

To determine the formula of a new substance, one of the first steps is to find the ____. a. molar mass c. volume at STP b. percent composition d. number of particles per mole

b. percent composition

In a double-replacement reaction, the ____. a. products are always molecular b. reactants are two ionic compounds c. reactants are two elements d. products are a new element and a new compound

b. reactants are two ionic compounds

What is the number of moles in 432 g Ba(NO)? a. 0.237 mol c. 1.65 mol b. 0.605 mol d. 3.66 mol

c. 1.65 mol

What is the percent composition of chromium in BaCrO? a. 4.87% c. 20.5% b. 9.47% d. 25.2%

c. 20.5%

What is the number of moles in 500 L of He gas at STP? a. 0.05 mol c. 22 mol b. 0.2 mol d. 90 mol

c. 22 mol

When the equation Fe Cl FeCl is balanced, what is the coefficient for Cl? a. 1 c. 3 b. 2 d. 4

c. 3

How many hydrogen atoms are in 5 molecules of isopropyl alcohol, CHO? a. 5 x (6.02 x 10²³) c. 35 b. 5 d. 35 x (6.02 x 10²³)

c. 35

If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound? a. 28.5% c. 71.5% b. 39.9% d. 60.1%

c. 71.5%

In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is the percent yield of silver in this reaction? Cu + 2AgNO Cu(NO) + 2Ag a. 56.7% c. 88.2% b. 77.3% d. 176%

c. 88.2%

What is the molar mass of (NH)CO? a. 144 g c. 96 g b. 138 g d. 78 g

c. 96 g

What is the empirical formula of a substance that is 53.5% C, 15.5% H, and 31.1% N by weight? a. C₃HN₂ c. C₂H⁸N b. C₄H₁₄N₂ d. CH₄N₇

c. C₂H⁸N

What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight? a. SO c. SO₃ b. SO₂ d. S₆O₄

c. SO₃

In a chemical reaction, the mass of the products ____. a. is less than the mass of the reactants b. is greater than the mass of the reactants c. is equal to the mass of the reactants d. has no relationship to the mass of the reactants

c. is equal to the mass of the reactants

In a combustion reaction, one of the reactants is ____. a. hydrogen c. oxygen b. nitrogen d. a metal

c. oxygen

When an equation is used to calculate the amount of product that will form during a reaction, then the value obtained is called the ____. a. actual yield c. theoretical yield b. percent yield d. minimum yield

c. theoretical yield

How many molecules are in 2.10 mol CO? a. 2.53 x 10²⁴ molecules c. 3.49 x 10⁻²⁴ molecules b. 3.79 x 10²⁴ molecules d. 1.26 x 10²⁴ molecules

d. 1.26 x 10²⁴ molecules

What is the mass of oxygen in 250 g of sulfuric acid, HSO? a. 0.65 g c. 16 g b. 3.9 g d. 160 g

d. 160 g

What is the molar mass of AuCl3? a. 96 g c. 232.5 g b. 130 g d. 303.6 g

d. 303.6 g

How many atoms are in 0.075 mol of titanium? a. 1.2 x 10⁻²⁵ c. 6.4 x 10² b. 2.2 x 10²⁴ d. 4.5 x 10²²

d. 4.5 x 10²²

Use the activity series of metals to complete a balanced chemical equation for the following single replacement reaction. Ag(s) + KNO(aq) a. AgNO₃ + K b. AgK + NO₃ c. AgKNO₃ d. No reaction takes place because silver is less reactive than potassium.

d. No reaction takes place because silver is less reactive than potassium.

Avogadro's number of representative particles is equal to one ____. a. kilogram c. kelvin b. gram d. mole

d. mole

What SI unit is used to measure the number of representative particles in a substance? a. kilogram c. kelvin b. ampere d. mole

d. mole