Question 1

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

Accepted Answer

Combustion Reaction

Answer

Decomposition Reaction

Answer

Single Replacement Reaction

Answer

Combination Reaction

Question 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

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

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.

Question 3

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

Accepted Answer

If a new product was formed and there is a change in color, state, odor, and taste, or if bubbles evolve.

Answer

If a new product was formed.

Answer

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

Answer

If the reactants’ number of atoms remains the same.

Question 4

What is the type of chemical reaction in H2O (l) + MgO (s) → Mg(OH)₂(s)

Accepted Answer

Combination

Answer

Decomposition

Answer

Combustion

Answer

Single Replacement

Question 5

What is the type of chemical reaction in 2NaCl (s) + F₂ (g) → 2NaF (s) + Cl₂ (g)

Accepted Answer

Single Replacement

Answer

Combustion

Answer

Combination

Answer

Double Replacement

Question 6

What is the type of chemical reaction in 2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)

Accepted Answer

Decomposition

Answer

Double Replacement

Answer

Combustion

Answer

Combination

Question 7

What is the type of chemical reaction in 3Ba (s) + Cr₂O3 (s) → 3BaO (s) + 2Cr (s)

Accepted Answer

Single Replacement

Answer

Combination

Answer

Combustion

Answer

Double Replacement

Question 8

Which chemical equation is balanced?

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

Which chemical equation is balanced?

Accepted Answer

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

Answer

CaCO₃ (s) + HCl (aq) → 2CaCl₂ (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)

Question 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

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

Answer

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

Answer

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

Related quizzes

Related quizzes