Grade 10 Chemistry Review — Provincial Exam Practice (Chapters 4.2 & 4.3) (2026)

Two hosts work straight through the provincial exam practice for Chapters 4.2 and 4.3 — ten multiple choice questions on ionic compounds, naming, conservation of mass, and balancing coefficients — one at a time, with the rule behind each answer and a hook to keep it. The questions and the answers come from the practice sheet on Mr Schmitt's Science 10 site, whose file carries its own answer key at the end 1.

What this episode covers

Questions 1 to 3 — ionic or molecular, and naming in both directions. An ionic compound needs a metal paired with a non-metal or a polyatomic ion, so the hydrogen, the ammonia, and the carbonate ion on the page all lose, and potassium dichromate wins. A name carries its formula: di and pent become N2O5, and the second element's ending turns to ide. Where the metal can hold more than one charge, the charge arithmetic settles the Roman numeral — two sulphides make four minus, so the manganese in MnS2 is four plus.
Questions 4 to 6 — three pictures on the page. An atom drawn with one bond and no lone pairs is hydrogen; one bond with three lone pairs is fluorine, so that pair of molecules gives hydrogen fluoride. Conservation of mass only shows itself in a closed system, which is why the flask with the balloon beats the flask open to the room. Count the atoms in CH4 + 2O2 and the blank takes one CO2.
Questions 7 to 10 — grams on the scale and coefficients in front. Thirty-two grams plus ninety-six grams is a hundred and twenty-eight grams going in, so the zinc weighs 128 − 76 = 52 g. Start N2 + I2 → NI3 from the three iodines on the right and I2 takes a 3. In K3PO4 + ZnSO4 → K2SO4 + Zn3(PO4)2 the phosphate travels as one block and the coefficients are 2, 3, 3, 1 — the same equation that came up on the Chapter 4.2 and 4.3 practice test, which is the sheet's own point about the exam recycling its questions. Two NH4ClO4 give N2, Cl2, 4H2O and 2O2, so O2 takes a 2.

Quick answers

Question	Answer
1. Which formula is an ionic compound	D — K2Cr2O7, potassium dichromate
2. Formula for dinitrogen pentoxide	B — N2O5
3. Name of MnS2	D — manganese(IV) sulphide
4. Product from the two electron-dot molecules	D — hydrogen fluoride
5. Best data for the law of conservation of mass	D — bicarbonate and acetic acid with a balloon over the flask
6. Missing product in CH4 + 2O2 → ___ + 2H2O	B — CO2
7. Zinc from 32 g plus 96 g giving 76 g	C — 52 g
8. Coefficient on I2 in N2 + I2 → NI3	C — 3
9. Coefficients for K3PO4 + ZnSO4 → K2SO4 + Zn3(PO4)2	D — 2, 3, 3, 1
10. Coefficient on O2 in the NH4ClO4 decomposition	B — 2

That is the whole provincial exam practice on Chapters 4.2 and 4.3. Press play and study along.

References

1
4.2 & 4.3 Provincial Exam Practice — Mr Schmitt, Science 10
mrschmittscience10.weebly.com

What this episode covers

Questions 1 to 3 — ionic or molecular, and naming in both directions. An ionic compound needs a metal paired with a non-metal or a polyatomic ion, so the hydrogen, the ammonia, and the carbonate ion on the page all lose, and potassium dichromate wins. A name carries its formula: di and pent become N2O5, and the second element's ending turns to ide. Where the metal can hold more than one charge, the charge arithmetic settles the Roman numeral — two sulphides make four minus, so the manganese in MnS2 is four plus.

Questions 4 to 6 — three pictures on the page. An atom drawn with one bond and no lone pairs is hydrogen; one bond with three lone pairs is fluorine, so that pair of molecules gives hydrogen fluoride. Conservation of mass only shows itself in a closed system, which is why the flask with the balloon beats the flask open to the room. Count the atoms in CH4 + 2O2 and the blank takes one CO2.

Questions 7 to 10 — grams on the scale and coefficients in front. Thirty-two grams plus ninety-six grams is a hundred and twenty-eight grams going in, so the zinc weighs 128 − 76 = 52 g. Start N2 + I2 → NI3 from the three iodines on the right and I2 takes a 3. In K3PO4 + ZnSO4 → K2SO4 + Zn3(PO4)2 the phosphate travels as one block and the coefficients are 2, 3, 3, 1 — the same equation that came up on the Chapter 4.2 and 4.3 practice test, which is the sheet's own point about the exam recycling its questions. Two NH4ClO4 give N2, Cl2, 4H2O and 2O2, so O2 takes a 2.

Quick answers

Question	Answer
1. Which formula is an ionic compound	D — K2Cr2O7, potassium dichromate
2. Formula for dinitrogen pentoxide	B — N2O5
3. Name of MnS2	D — manganese(IV) sulphide
4. Product from the two electron-dot molecules	D — hydrogen fluoride
5. Best data for the law of conservation of mass	D — bicarbonate and acetic acid with a balloon over the flask
6. Missing product in CH4 + 2O2 → ___ + 2H2O	B — CO2
7. Zinc from 32 g plus 96 g giving 76 g	C — 52 g
8. Coefficient on I2 in N2 + I2 → NI3	C — 3
9. Coefficients for K3PO4 + ZnSO4 → K2SO4 + Zn3(PO4)2	D — 2, 3, 3, 1
10. Coefficient on O2 in the NH4ClO4 decomposition	B — 2

That is the whole provincial exam practice on Chapters 4.2 and 4.3. Press play and study along.

Grade 10 Chemistry Review — Provincial Exam Practice (Chapters 4.2 & 4.3)

What this episode covers

Quick answers

References

Related content

Grade 10 Chemistry Review — Provincial Exam Practice (Chapters 4.2 & 4.3)

What this episode covers

Quick answers

References

Related content