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QUESTION 1 When propane undergoes complete combustion, the products are carbon dioxide and water.? ? ? ? __ C 3 H 8 (g) + __

QUESTION 1

  1. When propane undergoes complete combustion, the products are carbon dioxide and water.? ? ? ? __ C3H8(g) + __ O2(g) ? __ CO2(g) + __ H2O(g)What are the respective coefficients when the equation is balanced with the smallest whole numbers?

2 points ?

QUESTION 2

  1. What is the balanced chemical equation for the complete combustion of benzoic acid, C6H5CO2H, to form carbon dioxide and water?

2 points ?

QUESTION 3

  1. Which of the following statements is/are CORRECT?

    ? 1. Water soluble ionic compounds, such as NaCl, are strong electrolytes.
    ? 2. Some molecular compounds, such as HCl, are strong electrolytes.
    ? 3. Some molecular compounds, such as acetic acid, are weak electrolytes.
    ? ? ?

2 points ?

QUESTION 4

  1. Which one of the following compounds is a nonelectrolyte when dissolved in water?

2 points ?

QUESTION 5

  1. A precipitate will form when aqueous Pb(NO3)2 is added to an aqueous solution of ____.

2 points ?

QUESTION 6

  1. What is the net ionic equation for the reaction of aqueous sodium hydroxide and aqueous iron(II) chloride?

2 points ?

QUESTION 7

  1. Which of the following compounds is a weak base?

2 points ?

QUESTION 8

  1. What are the spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide?

2 points ?

QUESTION 9

  1. Which of the following chemical equations show oxidation-reduction reactions?

    ? 1. Mg(s) + I 2(aq) ? MgI 2(s)
    ? 2. Pb(ClO 4) 2(aq) + 2 KI(aq) ? PbI2(s) + 2 KClO 4(aq)
    ? 3. Fe 2O 3(s) + 3 CO(g) ? 2 Fe(s) + 3 CO 2(g)
    ? ? ?

2 points ?

QUESTION 10

  1. When strongly heated, boric acid breaks down to boric oxide and water. What mass of boric oxide is formed from the decomposition of 15.0 g B(OH)3?? ? ? ? 2 B(OH)3(s) ? B2O3(s) + 3 H2O(g)

2 points ?

QUESTION 11

  1. What mass of water is produced by the complete combustion of 2.68 grams of ethanol, C2H5OH?

2 points ?

QUESTION 12

  1. How many moles of sodium bromide can be produced from the reaction of 1.03 moles of sodium with 0.650 moles of bromine gas?? ? ? ? 2 Na(s) + Br2(g) ? 2 NaBr(s)

2 points ?

QUESTION 13

  1. How many moles of Mg3P2(s) can be produced from the reaction of 0.14 mol Mg(s) with 0.020 mol P4(s)?? ? ? ? 6 Mg(s) + P4(s) ? 2 Mg3P2(s)

2 points ?

QUESTION 14

  1. Aspirin is produced by the reaction of salicylic acid (M = 138.1 g/mol) and acetic anhydride (M = 102.1 g/mol).? ? ? ? C7H6O3(s) + C4H6O3() ? C9H8O4(s) + C2H4O2()If 2.04 g of C9H8O4 (M = 180.2 g/mol) is produced from the reaction of 3.03 g C7H6O3 and 4.01 g C4H6O3, what is the percent yield?

2 points ?

QUESTION 15

  1. Naphthalene, a hydrocarbon, has an approximate molar mass of 128 g/mole. If the combustion of 0.6400 g naphthalene produces 0.3599 g H2O and 2.1977 g CO2, what is the molecular formula of this compound?

2 points ?

QUESTION 16

  1. If 4.49 g NaNO3 is dissolved in enough water to make 250.0 mL of solution, what is the molarity of the sodium nitrate solution?

2 points ?

QUESTION 17

  1. How many liters of 0.1107 M KCl(aq) contain 2.50 g of KCl?

2 points ?

QUESTION 18

  1. Zn reacts with hydrochloric acid.? ? ? ? Zn(s) + 2 HCl(aq) ? ZnCl2(aq) + H2(g)What volume of 3.05 M HCl(aq) will react with 25.0 g Zn(s)?

2 points ?

QUESTION 19

  1. At 0.982 atm, the height of mercury in a barometer is 0.746 m. If the mercury were replaced with ethanol, what height of ethanol (in meters) would be supported at this pressure? The densities of Hg and ethanol are 13.5 g/cm3 and 0.789 g/cm3, respectively.

2 points ?

QUESTION 20

  1. If the volume of a confined gas is expanded to four times the original volume while its temperature remains constant, what change will be observed?

2 points ?

QUESTION 21

  1. Which of the following relationships is/are CORRECT for gases?

    ? 1. The amount of a gas (in moles) is inversely proportional to its volume (at constant temperature and pressure).
    ? 2. The volume of a gas is directly proportional to its temperature in kelvin (at constant pressure and moles).
    ? 3. The pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles).
    ? ? ?

2 points ?

QUESTION 22

  1. If 0.357 g of CH4 gas is introduced into an evacuated 1.75 L flask at 25 ?C, what is the pressure inside the flask? (R = 0.08206 L?atm/mol?K)

2 points ?

QUESTION 23

  1. The pressure of O2 in a 15.0 L flask is 322 mm Hg at 44 ?C. What mass of O2 is in the flask? (R = 0.08206 L?atm/mol?K)

2 points ?

QUESTION 24

  1. A mass of 1.37 g of an unknown gas is introduced into an evacuated 1.70 L flask. If the pressure in the flask is 0.814 atm at 98 ?C, which of the following gases might be in the flask? (R = 0.08206 L?atm/mol?K)

2 points ?

QUESTION 25

  1. Ozone decomposes to oxygen according to the balanced chemical equation below.? ? ? ? 2 O3(g) ? 3 O2(g)If the rate of disappearance of ozone is ?2.4 ? 10?6 M/s, what is the rate of formation of oxygen?

2 points ?

QUESTION 26

  1. Which of the following factors are likely to affect the rate of a chemical reaction?

    ? 1. the presence of a catalyst
    ? 2. the temperature of the reactants
    ? 3. the physical state (solid, liquid, or gas) of the reactants
    ? ? ?

2 points ?

QUESTION 27

  1. What is the name given to a substance that increases the rate of a chemical reaction but is not itself consumed?

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