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AP Exams AP Chemistry Chemical Reactions Easy Practice Question

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question 1 Multiple Choice Question

Question

Which coefficients balance C3H8 + O2 → CO2 + H2O?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

Detailed Explanation

Question

Which coefficients balance C3H8 + O2 → CO2 + H2O?

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

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Question 1

Easy Marks: 1.0 Practice Question

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Balance atoms and charge first, then apply mole ratios, solubility rules, or electron transfer as required.

Solve in 3 steps:

Mark the given values and the exact target.
Apply the relevant formula, rule, or concept.
Check the final value against the options.

Common mistake: Do not choose an option before confirming the exact demand of the question.

Question

Which coefficients balance C3H8 + O2 → CO2 + H2O?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

Why this answer is correct

The correct option matches the required rule and the given information.

Short Explanation

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

Detailed Explanation

Question

Which coefficients balance C3H8 + O2 → CO2 + H2O?

ANSWER

Correct Answer: A

Method / Topic: Chemical Reactions

Three carbon atoms require 3CO2, eight hydrogen atoms require 4H2O, and the products then contain ten oxygen atoms, requiring 5O2.

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Concept tagged

Balance atoms and charge first then apply mole ratios solubility rules or electron transfer as required.

Chemical Reactions · Easy Q10572: What is the net ionic equation when aqueous AgNO3 and NaCl are mixed? Chemical Reactions · Easy Q10573: The reaction Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq) is best classified as: Chemical Reactions · Easy Q10574: For 2H2(g)+O2(g)→2H2O(g), how many moles of O2 are required to react completely with 5.0 … Chemical Reactions · Easy Q10575: For 2H2+O2→2H2O, a mixture contains 4.0 mol H2 and 3.0 mol O2. Which reactant is limiting?

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