Grade 10 Chemistry Review — Chemical Equations and Reactions (Chapter 6 Practice Test)
You've got the Chapter 6 practice test open in front of you — the chemical equations and reactions test, thirty-five items across three parts.
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Grade 10 Chemistry Review — Chemical Equations and Reactions (Chapter 6 Practice Test)
Two hosts work straight through the Chapter 6 practice test — the chemical equations and reactions test — all thirty-five items, fifteen multiple choice, ten matching, and ten reactions to balance and classify, one question at a time, with the rule behind each answer and a hook to keep it. The questions and the answers come from the practice test on Mr Schmitt's Science 10 site, whose answer key is printed on its last page 1.
What this episode covers
- Questions 1 to 5 — counting atoms in a formula. A subscript after a bracket multiplies everything inside the bracket, and nothing outside it. Mg(ClO4)2 holds one magnesium, eight oxygens, and two perchlorate ions; Mg3(PO3)2 holds eleven atoms in total. In CO2 + H2O → C6H12O6 + O2 the product side carries eight oxygens.
- Questions 6 to 9 — reaction rates and balanced equations. Raising the temperature makes particles move faster, so they collide more often and harder — but it does not help them line up. Cs2CO3 + Mg(NO3)2 → 2CsNO3 + MgCO3, and CH4 + 2O2 → CO2 + 2H2O. Of the three equations given, only the second and the third are balanced.
- Questions 10 to 15 — two diagrams and two rate questions. Four H2O2 molecules give four O2 and four H2; 4CO2 + 4H2O → C4H8O4 + 4O2. In the flask, magnesium metal reacts with hydrochloric acid to give hydrogen gas, Mg + 2HCl → H2 + MgCl2. Raising the concentration speeds a reaction up because more particles collide more often.
- Matching, items 1 to 10 — naming the six reaction types. Synthesis (★ + □ → ★□; 2Mg + F2 → 2MgF), decomposition (DC → D + C; 2KClO3 → 2KCl + 3O2), single replacement (XY + Z → XZ + Y; CaCl2 + Br → BrCl2 + Ca), double replacement (ammonium hydroxide + copper fluoride; PAt + BUt → BAt + PUt), combustion (2C2H6 + 7O2 → 4CO2 + 6H2O), and neutralization (an acid group plus a hydroxide, giving a salt and water).
- Written response, items 1 to 5 — balance and classify. 2KCl + Mg(OH)2 → 2KOH + MgCl2 (double replacement); 2Cu + 3FeCl2 → 3Fe + 2CuCl3 (single replacement); 2Ni + 3I2 → 2NiI3 (synthesis); H2O2 → H2 + O2 (decomposition); CuBr2 + CaSO4 → CaBr2 + CuSO4 (double replacement). Item 4 is flagged in the episode: this sheet splits hydrogen peroxide into hydrogen and oxygen, while the course workbook gives the real breakdown, peroxide into water and oxygen 2; the episode answers it the sheet's way and says so.
- Written response, items 6 to 10 — balance and classify. HF + KOH → KF + H2O (neutralization); 2Na + H2SO4 → Na2SO4 + H2 (single replacement); 2HCl + Sn(OH)2 → SnCl2 + 2H2O (neutralization); 2MnBr3 → 2Mn + 3Br2 (decomposition); 2C4H10 + 13O2 → 8CO2 + 10H2O (combustion).
Quick answers
Multiple choice
| Question | Answer |
|---|---|
| 1. Magnesium atoms in Mg(ClO4)2 | B — one |
| 2. Oxygen atoms in Mg(ClO4)2 | D — eight |
| 3. Perchlorate ions in Mg(ClO4)2 | B — two |
| 4. Total atoms in Mg3(PO3)2 | D — eleven |
| 5. Oxygen atoms on the product side | D — eight |
| 6. Effects of raising the temperature | C — I, II, and IV |
| 7. Balancing Cs2CO3 + Mg(NO3)2 | A — 2CsNO3 + MgCO3 |
| 8. The reactant in ___ + 2O2 | C — CH4 |
| 9. Which equations are balanced | C — the second and third only |
| 10. Four H2O2 decomposing | D — 4 oxygen, 4 hydrogen |
| 11. Balancing CO2 + H2O → C4H8O4 + O2 | B — 4, 4, 1, 4 |
| 12. Reactants in the flask diagram | D — Mg and HCl |
| 13. Gas collected in the test tube | C — H2 |
| 14. Balanced equation for the diagram | D — Mg + 2HCl → H2 + MgCl2 |
| 15. Why more concentration speeds a reaction | A — more collisions |
Matching
| Item | Answer |
|---|---|
| 1. ★ + □ → ★□ | A — synthesis |
| 2. DC → D + C | B — decomposition |
| 3. Ammonium hydroxide + copper fluoride | D — double replacement |
| 4. An acid group + a hydroxide group → a salt + water | F — neutralization |
| 5. 2C2H6 + 7O2 → 4CO2 + 6H2O | E — combustion |
| 6. 2KClO3 → 2KCl + 3O2 | B — decomposition |
| 7. XY + Z → XZ + Y | C — single replacement |
| 8. PAt + BUt → BAt + PUt | D — double replacement |
| 9. CaCl2 + Br → BrCl2 + Ca | C — single replacement |
| 10. 2Mg + F2 → 2MgF | A — synthesis |
Written response
| Item | Coefficients | Type |
|---|---|---|
| 1. KCl + Mg(OH)2 → KOH + MgCl2 | 2, 1, 2, 1 | Double replacement |
| 2. Cu + FeCl2 → Fe + CuCl3 | 2, 3, 3, 2 | Single replacement |
| 3. Ni + I2 → NiI3 | 2, 3, 2 | Synthesis |
| 4. H2O2 → H2 + O2 | 1, 1, 1 | Decomposition |
| 5. CuBr2 + CaSO4 → CaBr2 + CuSO4 | 1, 1, 1, 1 | Double replacement |
| 6. HF + KOH → KF + H2O | 1, 1, 1, 1 | Neutralization |
| 7. Na + H2SO4 → Na2SO4 + H2 | 2, 1, 1, 1 | Single replacement |
| 8. HCl + Sn(OH)2 → SnCl2 + H2O | 2, 1, 1, 2 | Neutralization |
| 9. MnBr3 → Mn + Br2 | 2, 2, 3 | Decomposition |
| 10. C4H10 + O2 → CO2 + H2O | 2, 13, 8, 10 | Combustion |
That is the whole Chapter 6 practice test. Press play and study along.
References
- 1Chapter 6 Practice Test — Chemical Equations and Reactions
mrschmittscience10.weebly.com
- 2Chapter 6 Workbook — Answer Key
mrschmittscience10.weebly.com
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