25' Chem Semester 2 Exam 1a

The unbalanced chemical equation below represents the formation of ammonia. N2(g) + H2(g) → NH3(g) When the equation is balanced using the smallest whole-number coefficients, what is the ratio of moles of hydrogen consumed to moles of ammonia produced?

• 1:3

• 3:2

• 3:1

• 2:3

The chemical equation below is correctly balanced. 2 Na + 2 H2O → 2 X + H2 What is the correct formula for the product represented by X?

• Na2O

• Na2OH

• NaO

• NaOH

The chemical equation below is unbalanced. Al(OH)3 + H2SO4 → Al2(SO4)3 + H2O What is the coefficient of H2O when the equation is correctly balanced using the smallest whole-number coefficients?

• 2

• 3

• 4

• 6

Which type of reaction will occur when equal volumes of 0.1 M HCl and 0.1 M NaOH are mixed?

• Electrolysis

• Hydrolysis

• Ionization

• Neutralization

Which of the following chemical reactions will produce a precipitate?

• Pb(NO3)2 + 2 HCl → PbCl2 + 2 HNO3

• HCl + NaOH → NaCl + H2O

• 2 HCl + Zn → ZnCl2 + H2

• CuSO4 + 2 HCl → CuCl2 + H2SO4

What is the total mass, in grams, of 0.75 mole of SO2?

• 16

• 24

• 32

• 48

What is the percent by mass of oxygen in Fe2O3 (gram formula mass = 160 grams)?

• 16%

• 30%

• 56%

• 70%

The chemical equation below represents the combustion of propane. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) At STP, what is the total number of liters of CO2 produced when 5.0 liters of C3H8(g) burns completely?

• 1.0 L

• 3.0 L

• 5.0 L

• 15 L

Two samples of gold that have different temperatures are placed in contact with one another. Heat will flow spontaneously from a sample of gold at 60°C to a sample of gold that has which of the following temperatures?

• 50°C

• 60°C

• 70°C

• 80°C

Which statement describes the transfer of heat energy that occurs when an ice cube is added to an insulated container with 100 milliliters of water at 25°C?

• Both the ice cube and the water gain heat energy.

• Both the ice cube and the water lose heat energy.

• The ice cube gains heat energy, and the water loses heat energy.

• The ice cube loses heat energy, and the water gains heat energy.