Question 1

1. Which type of chemical reaction is involved once you turned on the gas stove?

Accepted Answer

Combustion Reaction

Answer

Decomposition Reaction

Answer

Combination Reaction

Answer

Single Replacement Reaction

Question 2

2. Which is NOT TRUE about the Law of Conservation of mass?

Accepted Answer

The total mass of the product of the reaction is less than the reactants.

Answer

Mass is neither created nor destroyed in a chemical reaction.

Answer

The product of the reaction is different from the reactants but, the mass is still the same.

Answer

The number of atoms before and after the reaction is equal.

Question 3

3. How can we say that a chemical reaction took place between reactants?

Accepted Answer

Both Statement 1 and 2 are correct

Answer

Statement 1: If a new product was formed.

Answer

Statement 2: If there is a change in color, state, odor, and taste, or bubbles evolve.

Answer

Statement 3: If the reactants’ number of atoms remains the same.

Question 4

4. Determine the type of chemical reaction: H2O (l) + MgO (s) → Mg(OH)2 (s)

Accepted Answer

Combination

Answer

Decomposition

Answer

Single Replacement

Answer

Combustion

Question 5

5. Determine the type of chemical reaction: 2NaCl (s) + F2 (g) → 2NaF (s) + Cl2 (g)

Accepted Answer

Single Replacement

Answer

Combustion

Answer

Combination

Answer

Double Replacement

Question 6

6. Determine the type of chemical reaction: 2NaClO3 (s) → 2NaCl (s) + 3O2 (g)

Accepted Answer

Decomposition

Answer

Combination

Answer

Double Replacement

Answer

Combustion

Question 7

7. Determine the type of chemical reaction: 3Ba (s) + Cr2O3 (s) → 3BaO (s) + 2Cr (s)

Accepted Answer

Single Replacement

Answer

Double Replacement

Answer

Decomposition

Answer

Combustion

Question 8

8. What numerical coefficients are needed to balance the equation: ___CH4 (g) + ___O2 (g) → ___CO2 (g) + ___H2O (g)

Accepted Answer

CH4 (g) + 2O2(g) → CO2 (g) + 2H2O (g)

Answer

CH4 (g) + O2 (g) → CO2 (g) + H2O (g)

Answer

2CH4 (g) + O2 (g) → 4CO2 (g) + 2H2O (g)

Answer

CH4(g) + O2 (g) → 2CO2 (g) + H2O (g)

Question 9

9. What numerical coefficients are needed to balance the equation:___CaCO3 (s) + ___ HCl (aq) → ___ CaCl2 (aq) + ___ CO2 (g) + ___ H2O (l)

Accepted Answer

CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

Answer

CaCO3 (s) + HCl (aq) → CaCl2 (aq) + 2CO2 (g) + H2O (l)

Answer

2CaCO3 (s) + HCl(aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

Answer

CaCO3 (s) + HCl (aq) → 2CaCl2 (aq) + CO2 (g) + H2O (l)

Question 10

10. If I want to use a wire to hang my plants, which will last longer: an iron wire or a copper wire? Why?

Accepted Answer

A copper wire because it will not react with water and oxygen under normal condition.

Answer

An iron wire because it is less reactive to water and oxygen than copper.

Answer

A copper wire because it is reactive to water and oxygen under normal condition.

Answer

An iron wire because it is more reactive to water and oxygen than copper.

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