Choose the correctly balanced chemical equation from the list.

2H2 SO4 + Pb(OH)4 → Pb(SO4)2 + 4H2O

H2 SO4 + Pb(OH)4 → Pb(SO4)2 + 4H2O

2H2 SO4 + Pb(OH)4 → PbSO4 + 4H2O

2H2 SO4 + Pb(OH)4 → Pb(SO4)2 + H2O

Choose the correctly balanced chemical equation from the list.

Mg(OH)2 + 2HCl → MgCl2 + 2H2O

Choose the correctly balanced chemical equation from the list.

Na3PO4 + 3HCl → 3NaCl + H3PO4

3Na3PO4 + 3HCl → 3NaCl + H3PO4

Na3PO4 + 2HCl → 3NaCl + H3PO4

Can You Take The Challenge On This Chemistry Quiz

Approved & Edited by ProProfs Editorial Team

The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.

Learn about Our Editorial Process

| By Max

Max

Community Contributor

Quizzes Created: 37 | Total Attempts: 55,028

Questions: 10 | Attempts: 148 | Updated: Mar 18, 2023

Questions

Settings

Feedback

During the Quiz End of Quiz

Difficulty

Sequential Easy First Hard First

Play as

Quiz Flashcard

Create your own Quiz

Share on Facebook Share on Twitter Share on Whatsapp Share on Pinterest Share on Email Copy to Clipboard Embed on your website

Can You Take The Challenge On This Chemistry Quiz - Quiz

In chemistry, equations help us to know about what is happening in a chemical reaction. The starting materials are known as the reactants (sometimes called reagents), and the new materials are called the products. Scientists use balanced symbol equations to describe chemical reactions. Can you rightly balance these equations? Take this quiz to find out.

Questions and Answers

1.

Choose the correctly balanced chemical equation from the list.
- A.
  
  CH₄ + 2O₂ → CO₂ + H₂O
- B.
  
  CH₄ + 3O₂ → CO₂ + 2 H₂O
- C.
  
  CH₄ + 2O₂ → CO₂ + 2 H₂O
- D.
  
  CH₄ + 2O₂ → CO₂ + 3 H₂O
Correct Answer
C. CH₄ + 2O₂ → CO₂ + 2 H₂O

Explanation
The balanced chemical equation shows that one molecule of methane (CH4) reacts with two molecules of oxygen (O2) to produce one molecule of carbon dioxide (CO2) and two molecules of water (H2O). This is the correct equation because it follows the law of conservation of mass, where the number of atoms on both sides of the equation is the same.

Rate this question:
2.

Choose the correctly balanced chemical equation from the list.
- A.
  
  Al + 6HCl → 2AlCl₃ + 3H₂
- B.
  
  2Al + 6HCl → 2AlCl₃ + 3H₂
- C.
  
  Al + HCl → AlCl₃ + H₂
- D.
  
  2Al + HCl → AlCl₃ + 3H₂
Correct Answer
B. 2Al + 6HCl → 2AlCl₃ + 3H₂

Explanation
The balanced chemical equation must have the same number of atoms of each element on both sides of the equation. In this case, the equation 2Al + 6HCl -> 2AlCl3 + 3H2 satisfies this requirement. It shows that 2 atoms of Aluminum (Al) react with 6 molecules of Hydrochloric acid (HCl) to produce 2 molecules of Aluminum chloride (AlCl3) and 3 molecules of Hydrogen gas (H2). This equation is balanced because it has an equal number of Al, H, and Cl atoms on both sides.

Rate this question:
3.

Choose the correctly balanced chemical equation from the list.
- A.
  
  C₂H₆ + 3¹/₂O₂ → 2CO₂ + 3H₂O
- B.
  
  C₂H₆ + 7O₂ → 4CO₂ + 5H₂O
- C.
  
  C₂H₆ + 3O₂ → 2CO₂ + 3H₂O
- D.
  
  C₂H₆ + 3¹/₂O₂ → CO₂ + 3H₂O
Correct Answer
A. C₂H₆ + 3¹/₂O₂ → 2CO₂ + 3H₂O

Explanation
The correct answer is C2H6 + 31/2O2 → 2CO2 + 3H2O. This equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 2 carbon atoms, 6 hydrogen atoms, and 7 oxygen atoms on both sides of the equation. The coefficients in front of each molecule indicate the number of molecules involved in the reaction, and they are chosen to ensure that the equation is balanced.

Rate this question:
4.

Choose the correctly balanced chemical equation from the list.
- A.
  
  2NaBr + Cl₂ → 2NaCl + Br₂
- B.
  
  NaBr + Cl₂ → NaCl + Br₂
- C.
  
  2NaBr + Cl₂ → NaCl + Br₂
- D.
  
  3NaBr + Cl₂ → 3NaCl + Br₂
Correct Answer
A. 2NaBr + Cl₂ → 2NaCl + Br₂

Explanation
The given chemical equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 2 sodium (Na) atoms, 2 bromine (Br) atoms, 1 chlorine (Cl) atom, and 1 bromine (Br) atom on both sides of the equation. This means that the equation follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

Rate this question:
5.

Choose the correctly balanced chemical equation from the list.
- A.
  
  2H₂ SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O
- B.
  
  H₂ SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O
- C.
  
  2H₂ SO₄ + Pb(OH)₄ → PbSO₄ + 4H₂O
- D.
  
  2H₂ SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + H₂O
Correct Answer
A. 2H₂ SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O

Explanation
The given correct answer is the balanced chemical equation for the reaction between 2 moles of sulfuric acid (H2SO4) and 1 mole of lead(IV) hydroxide (Pb(OH)4). It produces 1 mole of lead(II) sulfate (Pb(SO4)2) and 4 moles of water (H2O). The coefficients in the equation represent the stoichiometric ratios between the reactants and products, ensuring that the number of atoms of each element is the same on both sides of the equation.

Rate this question:
6.

Choose the correctly balanced chemical equation from the list.
- A.
  
  Mg(OH)₂ + 2HCl → MgCl₂ + H₂O
- B.
  
  Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O
- C.
  
  Mg(OH)₂ + HCl → MgCl₂ + H₂O
- D.
  
  MgOH + 2HCl → MgCl₂ + 2H₂O
Correct Answer
B. Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

Explanation
The correct answer is Mg(OH)2 + 2HCl → MgCl2 + 2H2O. This equation is balanced because there are an equal number of atoms on both sides of the equation. The equation follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. In this equation, there are 2 magnesium atoms, 4 hydrogen atoms, 2 chlorine atoms, and 2 oxygen atoms on both sides of the equation. Therefore, this equation is correctly balanced.

Rate this question:
7.

Choose the correctly balanced chemical equation from the list.
- A.
  
  TiCl₄ + H₂O → TiO + 4HCl
- B.
  
  TiCl₄ + 3H₂ → TiO₂ + 5HCl
- C.
  
  TiCl₄ + H₂ → TiO₂ + HCl
- D.
  
  TiCl₄ +2H₂O → TiO₂ + 4HCl
Correct Answer
D. TiCl₄ +2H₂O → TiO₂ + 4HCl

Explanation
The correct answer is TiCl4 + 2H2O → TiO2 + 4HCl. This is the balanced chemical equation because the number of atoms of each element is the same on both sides of the equation. There are 1 titanium (Ti) atom, 4 chlorine (Cl) atoms, 4 hydrogen (H) atoms, and 2 oxygen (O) atoms on both sides. The coefficients in front of each compound indicate the number of molecules or moles of that compound involved in the reaction, and they are balanced to ensure that the number of atoms is conserved.

Rate this question:
8.

Choose the correctly balanced chemical equation from the list.
- A.
  
  3Na₃PO₄ + 3HCl → 3NaCl + H₃PO₄
- B.
  
  Na₃PO₄ + 2HCl → 3NaCl + H₃PO₄
- C.
  
  Na₃PO₄ + HCl → NaCl + H₃PO₄
- D.
  
  Na₃PO₄ + 3HCl → 3NaCl + H₃PO₄
Correct Answer
D. Na₃PO₄ + 3HCl → 3NaCl + H₃PO₄

Explanation
The given equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 3 sodium (Na) atoms, 1 phosphorus (P) atom, 12 oxygen (O) atoms, and 3 chlorine (Cl) atoms on both sides of the equation. The coefficients in front of each compound indicate the number of molecules or moles of that compound, and they are balanced as well. Therefore, this equation is correctly balanced.

Rate this question:
9.

Choose the correctly balanced chemical equation from the list.
- A.
  
  PCl₅ + H₂O → H₃PO₄ + HCl
- B.
  
  PCl₅ + 4H₂O → H₃PO₄ + HCl
- C.
  
  PCl₅ + 4H₂O → H₃PO₄ + 5HCl
- D.
  
  PCl₅ + 4H₂O → H₃PO₄ + 5HC
Correct Answer
C. PCl₅ + 4H₂O → H₃PO₄ + 5HCl

Explanation
The balanced chemical equation is PCl5 + 4H2O → H3PO4 + 5HCl. This equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 1 phosphorus atom, 5 chlorine atoms, 8 hydrogen atoms, and 4 oxygen atoms on both sides of the equation, which indicates that the equation is balanced.

Rate this question:
10.

Choose the correctly balanced chemical equation from the list.
- A.
  
  FeO₃ + 3CO → Fe + 3CO₂
- B.
  
  2FeO₃ + 2CO → Fe + 3CO₂
- C.
  
  FeO₃ + 3CO → Fe + 2CO₂
- D.
  
  FeO₃+ 3CO → Fe + CO₂
Correct Answer
A. FeO₃ + 3CO → Fe + 3CO₂

Explanation
The correct answer is FeO3 + 3CO → Fe + 3CO2. This equation is balanced because there are equal numbers of each type of atom on both sides of the equation. There is one Fe atom on both sides, three O atoms on both sides, and three C atoms on both sides. Additionally, there are two CO2 molecules on the right side to balance the equation.

Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 18, 2023

Quiz Edited by
ProProfs Editorial Team
Apr 27, 2019

Quiz Created by
Max