Reaction Types I: Combination And Decomposition

See how substances join together or break apart

ScienceGrade 10Mixed12 questions24 min

Print / Save as PDF

Preview

Preview questions

Sample preview - start assignment to submit answers.

Focus question style

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

Preview onlyStart free practice to answer.

Section A: Combination Reactions

Identify reactions where two or more reactants form one product.

Classify each equation or description correctly.

Question 1

EasyQuestion

Which equation represents a combination reaction?

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

Question 2

EasyQuestion

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

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

Question 3

MediumQuestion

Combination and decomposition reactions are often considered opposite because:

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

Question 4

MediumQuestion

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

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

Question 5

MediumQuestion

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

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

What this assignment covers

Learn to identify combination reactions, thermal decomposition, electrolytic decomposition and photolytic decomposition from equations and examples.

Skills and sections

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

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