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Reaction Types I: Combination and Decomposition

See how substances join together or break apart

ScienceGrade 10Mixed12 questions24 min

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Skills

Distinguish thermal photolytic and electrolytic decomposition, Distinguish exothermic and endothermic reactions, Connect temperature change with reaction energy, Identify energy changes in daily-life reactions, Classify displacement reactions

Question types

multiple choice

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Section A: Combination Reactions · 6 questionsSection B: Decomposition Reactions · 6 questions

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Section A: Combination Reactions

Identify reactions where two or more reactants form one product.

Classify each equation or description correctly.

Question 1

Easymultiple_choice

Which equation represents a combination reaction?

Topic: Types of Chemical Reactions · Skill: Distinguish thermal photolytic and electrolytic decomposition

Question 2

Easymultiple_choice

When magnesium burns in oxygen, the reaction type is mainly:

Topic: Types of Chemical Reactions · Skill: Distinguish thermal photolytic and electrolytic decomposition

Question 3

Mediummultiple_choice

Combination and decomposition reactions are often considered opposite because:

Topic: Types of Chemical Reactions · Skill: Distinguish exothermic and endothermic reactions

Question 4

Mediummultiple_choice

Classify: $2H_2 + O_2 \rightarrow 2H_2O$ .

Topic: Types of Chemical Reactions · Skill: Connect temperature change with reaction energy

Question 5

Mediummultiple_choice

The reaction $CaO + H_2O \rightarrow Ca(OH)_2 + heat$ is also:

Topic: Energy in Reactions · Skill: Identify energy changes in daily-life reactions