CHEM 120 EXAM 2 INTRODUCTION TO
GENERAL ORGANIC AND BIOLOGICAL
CHEMISTRY NEW UPDATE PRACTICE
SCRIPT 2026 QUESTIONS WITH ANSWERS
GRADED A+
⫸ What is the right side of a chemical reaction called? Answer:
Products
⫸ What are the states of matter represented in chemical equations?
Answer: s, l, g, and aq
⫸ How do you balance the chemical equation MgBr2 + KCl → MgCl2
+ KBr? Answer: MgBr2 + 2 KCl → MgCl2 + 2 KBr
⫸ How do you balance the chemical equation Al2(SO4)3 + CaO →
Al2O3 + CaSO4? Answer: Al2(SO4)3 + 3 CaO → Al2O3 + 3 CaSO4
⫸ How do you balance the chemical equation C10H12 + O2 → CO2 +
H2O? Answer: C10H12 + 13 O2 → 10 CO2 + 6 H2O
⫸ How do you balance the chemical equation FeBr2 + H2O → FeO +
HBr? Answer: FeBr2 + H2O → FeO + 2 HBr
, ⫸ What is stoichiometry in chemistry? Answer: The calculation of
reactants and products in chemical reactions.
⫸ If I have 60 moles of CO2, how many moles of O2 did I consume?
Answer: 78 moles O2
⫸ If I have 5 moles of CaO, how many moles of Al2O3 can I produce?
Answer: 1.67 moles Al2O3
⫸ How many moles of O2 are in 7 grams of CO2? Answer: 0.21 moles
O2
⫸ How many moles of CaCl2 can be produced from 5 moles of HCl?
Answer: 2.5 moles CaCl2
⫸ What is the formula for % mass concentration? Answer: g solute / (g
solute + g solvent) x 100%
⫸ What is the % mass of a solution with 5 grams of compound and 68
grams of water? Answer: 6.8% mass
⫸ What is molarity (M)? Answer: mol/L
⫸ What is the molarity of a solution with 8 g of O2 in 40,000 ml of
water? Answer: 0.006 M
GENERAL ORGANIC AND BIOLOGICAL
CHEMISTRY NEW UPDATE PRACTICE
SCRIPT 2026 QUESTIONS WITH ANSWERS
GRADED A+
⫸ What is the right side of a chemical reaction called? Answer:
Products
⫸ What are the states of matter represented in chemical equations?
Answer: s, l, g, and aq
⫸ How do you balance the chemical equation MgBr2 + KCl → MgCl2
+ KBr? Answer: MgBr2 + 2 KCl → MgCl2 + 2 KBr
⫸ How do you balance the chemical equation Al2(SO4)3 + CaO →
Al2O3 + CaSO4? Answer: Al2(SO4)3 + 3 CaO → Al2O3 + 3 CaSO4
⫸ How do you balance the chemical equation C10H12 + O2 → CO2 +
H2O? Answer: C10H12 + 13 O2 → 10 CO2 + 6 H2O
⫸ How do you balance the chemical equation FeBr2 + H2O → FeO +
HBr? Answer: FeBr2 + H2O → FeO + 2 HBr
, ⫸ What is stoichiometry in chemistry? Answer: The calculation of
reactants and products in chemical reactions.
⫸ If I have 60 moles of CO2, how many moles of O2 did I consume?
Answer: 78 moles O2
⫸ If I have 5 moles of CaO, how many moles of Al2O3 can I produce?
Answer: 1.67 moles Al2O3
⫸ How many moles of O2 are in 7 grams of CO2? Answer: 0.21 moles
O2
⫸ How many moles of CaCl2 can be produced from 5 moles of HCl?
Answer: 2.5 moles CaCl2
⫸ What is the formula for % mass concentration? Answer: g solute / (g
solute + g solvent) x 100%
⫸ What is the % mass of a solution with 5 grams of compound and 68
grams of water? Answer: 6.8% mass
⫸ What is molarity (M)? Answer: mol/L
⫸ What is the molarity of a solution with 8 g of O2 in 40,000 ml of
water? Answer: 0.006 M
