Grade 10 Chemistry Review — Naming and Balancing (Chapter 4.2 & 4.3 Practice Test)
You've got the Chapter 4.2 and 4.3 practice test in front of you, twenty-eight marks of naming compounds and balancing equations.
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Grade 10 Chemistry Review — Naming and Balancing (Chapter 4.2 & 4.3 Practice Test)
Two hosts work straight through the Chapter 4.2 and 4.3 practice test — all thirteen multiple-choice questions and both written-response parts — 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 and its answer key on Mr Schmitt's Science 10 site 12.
What this episode covers
- Questions 1 to 3 — ionic or covalent. Nickel is the multivalent element, because the data sheet gives it two charges. BeBr2 is beryllium bromide: an ionic name takes no prefixes and no Roman numeral, since beryllium has only one charge. SiO2 is silicon dioxide: a covalent name counts the atoms with prefixes, and the single atom in front takes no mono.
- Questions 4 to 8 — prefixes, Roman numerals, polyatomic ions. K3P is potassium phosphide, N2O3 is dinitrogen trioxide, and PbCl2 is lead (II) chloride, because two chlorides force lead to 2+. NaNO2 is sodium nitrite, the -ite with one oxygen fewer than nitrate, and diphosphorus trisulphide is P2S3, where the prefixes become the subscripts.
- Questions 9 to 12 — names back into formulas. Manganese (III) oxide is Mn2O3, made by crossing the 3+ and the 2− over. Potassium phosphite is K3PO3, because phosphite is the polyatomic ion PO33−. CO is carbon monoxide: mono never leads a covalent name, and the vowel drops out of monoxide. CuCl2 is ionic, KNO3 polyatomic, and CCl4 covalent.
- Question 13 — the coefficients. 2K3PO4 + 3ZnSO4 → 3K2SO4 + Zn3(PO4)2 balances as 2, 3, 3, 1, with the polyatomic groups balanced as blocks.
- Written part — seven names and formulas. Silver phosphide Ag3P; ammonium nitrite NH4NO2; manganese (II) sulphide MnS; copper (II) chloride CuCl2; nitrogen tribromide NBr3; lead (II) perchlorate Pb(ClO4)2; dichlorine monoxide Cl2O.
- Written part — six equations to balance. 2H2O2 → 2H2O + O2; 2BiCl3 + 3H2S → Bi2S3 + 6HCl; 2C2H6 + 7O2 → 4CO2 + 6H2O; Pb(NO3)2 + K2CrO4 → PbCrO4 + 2KNO3; Fe2O3 + 3H2 → 3H2O + 2Fe; Al4C3 + 12H2O → 3CH4 + 4Al(OH)3.
Quick answers
Multiple choice
| Question | Answer |
|---|---|
| 1. Multivalent element | Nickel |
| 2. BeBr2 | Beryllium bromide |
| 3. SiO2 | Silicon dioxide |
| 4. K3P | Potassium phosphide |
| 5. N2O3 | Dinitrogen trioxide |
| 6. PbCl2 | Lead (II) chloride |
| 7. NaNO2 | Sodium nitrite |
| 8. Diphosphorus trisulphide | P2S3 |
| 9. Manganese (III) oxide | Mn2O3 |
| 10. Potassium phosphite | K3PO3 |
| 11. Why monocarbon monooxide is wrong for CO | Mono never leads, and monoxide drops a vowel |
| 12. CuCl2, KNO3, CCl4 | Ionic, polyatomic, covalent |
| 13. K3PO4 + ZnSO4 equation | 2, 3, 3, 1 |
Written response
| Item | Answer |
|---|---|
| Silver phosphide | Ag3P |
| Ammonium nitrite | NH4NO2 |
| Manganese (II) sulphide | MnS |
| Copper (II) chloride | CuCl2 |
| Nitrogen tribromide | NBr3 |
| Lead (II) perchlorate | Pb(ClO4)2 |
| Dichlorine monoxide | Cl2O |
| H2O2 decomposition | 2, 2, 1 |
| BiCl3 + H2S | 2, 3, 1, 6 |
| C2H6 + O2 | 2, 7, 4, 6 |
| Pb(NO3)2 + K2CrO4 | 1, 1, 1, 2 |
| Iron(III) oxide + hydrogen | Fe2O3 + 3H2 → 3H2O + 2Fe |
| Aluminum carbide + water | Al4C3 + 12H2O → 3CH4 + 4Al(OH)3 |
That is the whole Chapter 4.2 and 4.3 practice test. Press play and study along.
References
- 1Chapter 4.2 & 4.3 Practice Test
mrschmittscience10.weebly.com
- 2Chapter 4.2 & 4.3 Practice Test — Answer Key
mrschmittscience10.weebly.com
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