Unit Quiz
Quiz Instructions
Complete all 10 questions without notes first, then check answers.
Scoring: 9-10 = Excellent | 7-8 = Good | 5-6 = Review needed | Below 5 = Retake unit
Quiz Questions
Q1: Balance: Na + Cl2 → NaCl
Answer: 2Na + Cl2 → 2NaCl
Q2: Identify reaction type: 2H2 + O2 → 2H2O
Answer: Synthesis (or combustion)
Q3: Balance: C2H6 + O2 → CO2 + H2O
Answer: 2C2H6 + 7O2 → 4CO2 + 6H2O
Q4: Is burning wood exothermic or endothermic?
Answer: Exothermic (releases heat and light)
Q5: What type is: AgNO3 + NaCl → AgCl + NaNO3
Answer: Double replacement
Q6: Balance: Al + O2 → Al2O3
Answer: 4Al + 3O2 → 2Al2O3
Q7: What does a catalyst do?
Answer: Lowers activation energy, speeds up reaction without being consumed
Q8: Identify: 2KClO3 → 2KCl + 3O2
Answer: Decomposition
Q9: An ice pack absorbs heat. Is the reaction inside exo- or endothermic?
Answer: Endothermic
Q10: What type is: Mg + 2HCl → MgCl2 + H2
Answer: Single replacement