Chemistry for changing times 14th edition. Chapter 5

11) When the equation below is balanced, the coefficient of sulfuric acid, H2SO4 is: NaCN + H2SO4 → Na2SO4 + HCN A) 1 B) 2 C) 3 D) 4

A)

14) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of oxygen is: CaO + SO2 + O2 → CaSO4 A) 1 B) 2 C) 3 D) 4

A)

15) Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. When the equation is written and balanced, the coefficient of magnesium nitride is A) 1. B) 3. C) 6. D) 8.

A)

21) When 2 liters of nitrogen gas react with 3 liters of hydrogen gas at constant temperature and pressure, how many liters of ammonia gas will be produced? A) 2 B) 3 C) 4 D) 5

A)

22) The law of combining volumes applies only to A) gases. B) liquids. C) solids. D) gases and liquids.

A)

23) Avogadro's number is A) 6.02 × 1023 B) 6.02 × 10-23 C) 3.02 × 1026 D) 2.06 × 1032

A)

31) Calcium metal reacts with water to form calcium hydroxide and hydrogen gas. How many grams of hydrogen are formed when 0.50 g of calcium are added to water? A) 0.025 g B) 0.050 g C) 0.10 g D) 0.50 g

A)

32) Joseph Priestley discovered oxygen in 1774 by heating mercury(II) oxide. The compound decomposes into its elements. How much oxygen, O2, is produced by the decomposition of 25 g of HgO? A) 1.8 g B) 3.7 g C) 5.5 g D) none of these

A)

35) What is the mass of 0.500 mol of NH3? A) 8.5 g B) 3.4 g C) 7.5 g D) 34 g

A)

39) Which of the following types of reactions can have a 100% yield? A) addition reaction B) substitution reaction C) neither addition nor substitution reactions D) both addition and substitution reactions

A)

10) When the equation below is balanced, the coefficient of sodium cyanide is: NaCN + H2SO4 → Na2SO4 + HCN A) 1 B) 2 C) 3 D) 4

B)

12) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of calcium oxide (commonly called "lime") is: CaO + SO2 + O2 → CaSO4 A) 1 B) 2 C) 3 D) 4

B)

13) The following reaction is important in the removal of sulfur dioxide, a major source of acid rain, from the smokestacks of coal burning power plants. When the equation below is balanced, the coefficient of calcium sulfate (commonly called "gypsum") is: CaO + SO2 + O2 → CaSO4 A) 1 B) 2 C) 3 D) 4

B)

16) When oxygen, O2, is passed through an electrical spark (lightning is a good natural source of an electrical spark), ozone, O3, is formed. When the equation is balanced, the coefficient of ozone is A) 1. B) 2. C) 3. D) 4.

B)

18) The total number of each type of atom must be the same on both sides of an equation in order to satisfy the A) Law of Combining Volumes. B) Law of Conservation of Matter. C) Law of Constant Composition. D) Law of Multiple Proportions.

B)

20) When 2 liters of hydrogen gas and 1 liter of oxygen gas react to form water at a constant temperature and pressure, how many liters of water vapor (steam) will be formed? A) 1 B) 2 C) 3 D) More information is required.

B)

28) Nitroglycerin has a formula C3H5(NO3)3. The molar mass of nitroglycerin is A) 65 g. B) 227 g. C) 309 g. D) 398 g.

B)

29) Aspirin has a formula C9H8O4. The molar mass of aspirin is A) 95 g. B) 180 g. C) 220 g. D) 325 g.

B)

3) When the equation below is balanced, the coefficient of zinc is: Zn + CuSO4 → ZnSO4 + Cu A) 0 B) 1 C) 2 D) 3

B)

36) How many moles of (NH4)2S are there in 75 g of (NH4)2S? A) 1.04 B) 1.10 C) 1.50 D) 1.56

B)

38) What is the best way to measure a reaction's efficiency? A) experimental yield B) percent atom economy C) percent yield D) theoretical yield

B)

42) The molarity of a solution that contains 8.0 g of NaOH in a liter of solution is A) 0.02 M. B) 0.2 M. C) 2 M. D) 0.8 M.

B)

43) The number of moles of NaOH that are in 250 mL of a 3 molar solution is A) 0.25 moles. B) 0.75 moles. C) 1.0 moles. D) 1.5 moles.

B)

5) When the equation below is balanced, the coefficient of copper(II) nitrate is: Cu + AgNO3 → Cu(NO3)2 + Ag A) 0 B) 1 C) 2 D) 3

B)

8) When the equation below is balanced, the coefficient of the product is: Fe + O2 → Fe2O3 A) 1 B) 2 C) 3 D) 4

B)

9) When the equation below is balanced, the coefficient of the hydrogen cyanide, HCN, is: NaCN + H2SO4 → Na2SO4 + HCN A) 1 B) 2 C) 3 D) 4

B)

1) Which one of the following reactions is NOT balanced? A) 2 CO + O2 → 2 CO2 B) 2 SO2 + O2 → 2 SO3 C) 2 KNO3 + 10 K → 5 K2O + N2 D) SF4 + 3 H2O → H2SO3 + 4 HF

C)

17) When oxygen, O2, is passed through an electrical spark (lightning is a good natural source of an electrical spark), ozone, O3, is formed. When the equation is balanced, the coefficient of oxygen is A) 1. B) 2. C) 3. D) 4.

C)

2) When the equation below is balanced, the coefficient of HCl is: AlCl3 + H2SO4 → Al2(SO4)3 + HCl A) 2 B) 3 C) 6 D) 12

C)

24) Which of the following has the same number of atoms as 23 g of sodium? A) 23 g of potassium B) 19 g of potassium C) 24 g of magnesium D) 18 g of water

C)

30) In the reaction CH4 + 2 O2 → CO2 + 2 H2O how many moles of oxygen are required to burn 16.0 g of methane? A) 0.50 B) 1.0 C) 2.0 D) 32

C)

33) Consider the following equation: N2 + 3 H2 → 2 NH3 Which of the following statements is NOT true for this equation? A) 1 mole of N2 reacts with 3 moles of H2. B) 1 L of N2 reacts with 3 L of H2. C) 1 gram of N2 reacts with 3 grams of H2. D) 1 molecule of N2 reacts with 3 molecules of H2.

C)

34) What is the molar mass of N2O? A) 30 g B) 30 u C) 44 g D) 44 u

C)

4) When the equation below is balanced, the coefficient of silver is: Cu + AgNO3 → Cu(NO3)2 + Ag A) 0 B) 1 C) 2 D) 3

C)

44) How many liters of a 0.2 M NaOH solution are needed in order to have 1.0 moles of NaOH? A) 0.2 L B) 0.8 L C) 5 L D) 8 L

C)

45) How many liters of a 0.2 M HCl solution are needed in order to have 1.0 moles of HCl? A) 0.2 L B) 0.8 L C) 5 L D) 8 L

C)

46) A chemist dissolves 10 g of NaCl in 200 mL of water. Water is the A) solution. B) solute. C) solvent. D) solubility.

C)

6) When the equation below is balanced, the coefficient of silver nitrate is: Cu + AgNO3 → Cu(NO3)2 + Ag A) 0 B) 1 C) 2 D) 3

C)

19) The observations that gaseous reactants combine to form gaseous products in volume ratios that are simple whole numbers is most directly summarized by which of the following. A) The Law of Conservation of Mass B) The Law of Fixed Proportions C) The Law of Multiple Proportions D) The Law of Combining Volumes

D)

25) Which of the following does NOT contain Avogadro's number of particles? A) 1.0 mole of carbon B) 23 g of sodium C) 6.02 × 1023 atoms of silicon D) 12 g of water

D)

26) The formula mass of CO2 is A) 28 g. B) 28 u. C) 44 g. D) 44 u.

D)

27) How many molecules are in 237 g (about a cup) of water? A) 13.1 B) 4267 C) 6.02 × 1023 D) 7.93 × 1024

D)

37) The quantitative relationship between reactants and products in a chemical reaction is A) relative mass. B) percent yield. C) molarity. D) stoichiometry.

D)

40) Molarity is a measure of A) the volume of a solution. B) the mass of a substance. C) the ability of a substance to ionize. D) the concentration of a solute in a solution.

D)

41) Expressing concentrations in terms of molarity is especially convenient since it allows one to count chemical particles by measuring A) the weights of solutes. B) the weights of solutions. C) the volumes of solvents. D) the volumes of solutions.

D)

47) What mass of KOH is needed to make 400 mL of 0.725 M KOH? A) 31.0 g B) 101.7 g C) 40.6 g D) 16.3 g

D)

7) When the equation below is balanced, the coefficient of oxygen is: Fe + O2 → Fe2O3 A) 0 B) 1 C) 2 D) 3

D)