Grade 10 · Science · Chemistry

10th grade Classify reactions: synthesis, decomposition, replacement, combustion worksheet

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Classify reactions: synthesis, decomposition, replacement, combustion

Grade 10 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Methane, CH₄, has 4 hydrogen atoms. When one methane molecule burns completely, how many H₂O molecules form, Ari?
Propane, C₃H₈, has 8 hydrogen atoms. When one propane molecule burns completely, how many H₂O molecules form, Bo?
Butane, C₄H₁₀, has 10 hydrogen atoms. When one butane molecule burns completely, how many H₂O molecules form, Esme?
4.
What type of reaction is AgNO₃ + NaCl → AgCl + NaNO₃, Jun?
- Decomposition
- Double replacement
- Single replacement
5.
What type of reaction is C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O, Kira?
- Double replacement
- Synthesis
- Combustion
6.
What type of reaction is Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag, Luz?
- Single replacement
- Double replacement
- Synthesis
7.
Water is split by electricity in a decomposition reaction. What are the products, Noah?
- H₂O₂ and H₂
- H₂ and O₂
- H and O atoms
8.
Zinc replaces hydrogen in dilute hydrochloric acid, HCl. Which products form, Pia?
- ZnCl₂ and H₂
- ZnCl and H
- ZnH₂ and Cl₂
9.
Zinc in dilute hydrochloric acid gives off bubbles. Which gas is in them, Ren?
- Hydrogen
- Chlorine
- Oxygen
10.
A copper wire in silver nitrate solution grows gray silver, and the liquid turns blue. What type of reaction is it, Zee?
- Single replacement
- Decomposition
- Combustion

Classify reactions: synthesis, decomposition, replacement, combustion. Every version has 10 questions, and the answer key prints on the second page.

I can sort a balanced equation into synthesis, decomposition, single replacement, double replacement or combustion.
I can predict the products of each type from its pattern.
I can match what is seen (bubbles, a white solid, a coated wire) to the reaction type.
I can say that complete combustion of a hydrocarbon makes CO₂ and H₂O, and count the products.

Standard: HS-PS1-2

synthesis: Two or more substances join into one product: A + B → AB

decomposition: One compound splits into simpler substances: AB → A + B

single replacement: An element takes another element's place in a compound: A + BC → AC + B

double replacement: Two compounds trade partners: AB + CD → AD + CB

combustion: A reaction with oxygen gas that gives off heat and light

Your child added the product's mass to the starting mass. In a decomposition the products share the starting mass, so subtract.

Your child made one water molecule per hydrogen atom. Each H₂O holds two hydrogens, so halve the hydrogen count.

Your child counted the oxygen in CO₂ only. The water made in combustion holds oxygen too, one atom per H₂O.

What is the most common mistake with classify reactions: synthesis, decomposition, replacement, combustion?

Your child added the product's mass to the starting mass. In a decomposition the products share the starting mass, so subtract.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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