Chemistry 101 Final Ivy Tech Exam

Chemistry 101 Final Ivy Tech Exam Questions with 100% Verified Correct Answers Graded A+ Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced

chemical equation is:

O2 + Mg ⟶ 2 MgO If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?

• 8 Moles
• 2 Moles
• 4 Moles
• 1 Mole
• Not Enough Info - Correct Answer C

Which of the following is TRUE?

• Stoichiometry allows prediction of how much of the reactants are necessary to form a given amount

of product.

• All of the above are true.
• Stoichiometry allows prediction of the amount of products that form in a chemical reaction based on

the amounts of reactants.

• Stoichiometry shows the numerical relationship between chemical quantities in a balanced chemical

equation. - Correct Answer B 1 / 3

Diatomic N2 can react with diatomic H2 to form ammonia (NH3). The balanced chemical equation is:

N2 + 3 H2 ⟶ 2 NH3

If 6 moles of H2 totally reacted with more than enough N2, how many moles of ammonia would be expected to form?

• 4 Moles
• 6 Moles
• 3 Moles
• 2 Moles
• Not enough info - Correct Answer A

How many grams of the excess reactant remain assuming the reaction goes to completion and that you start with 15.5 g of Na2S and 12.1 g of CuSO4?

Reaction: Na2S+ CuSO4 ⟶ Na2SO4 + CuS

A. 0.05

B. 9.58

C. 5.92

• 15.45 - Correct Answer B

Calculate the maximum number of grams of NH3 that can be produced by the reaction of 2.00 g of N2 with 3.00 g of H2.

Reaction: N2 (g) + 3H2 (g) ⟶ 2 NH3 (g)

A. 2.43

B. 0.964 2 / 3

• None of the above

D. 4.00

• 17.0 - Correct Answer A

Which is the limiting reactant in the following reaction given that you start with 42.0 g of CO2 and 99.9 g KOH?

Reaction: CO2+ 2 KOH ⟶ K2CO3 + H2O

A. CO2

• Not enough information

C. KOH

D. K2CO3

• H2O - Correct Answer C

How many moles of lithium nitrate are theoretically produced if we start with 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4?

Reaction: 3 Ca(NO3)2 + ⟶ 6LiNO3 + Ca3(PO4)2

A. 1.1

B. 6.8

C. 1.2

• Not enough info
• 7.2 - Correct Answer B

Consider the following reaction: 2 Mg + O2 ⟶ 2 MgO Δ Hrxn = -1203 kJ. Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg.

• -1203 kJ
• / 3