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 - Building Confidence

NameDate

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

100 g of calcium carbonate decomposes on heating into 56 g of calcium oxide and some carbon dioxide gas. What mass of carbon dioxide forms, Ari?
18 g of water decomposes with electricity into 2 g of hydrogen gas and some oxygen gas. What mass of oxygen forms, Bo?
68 g of hydrogen peroxide decomposes into 36 g of water and some oxygen gas. What mass of oxygen forms, Esme?

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4.
Using the card, which type has two compounds trading partners, Kira?
- Single replacement
- Double replacement
- Synthesis
5.
Using the card, what does a fuel like methane make when it burns completely, Luz?
- CH₄ and O₂
- CO₂ and H₂O
- C and H₂
6.
What type of reaction is 2 Na + Cl₂ → 2 NaCl, Milo?
- Decomposition
- Synthesis
- Combustion
7.
What type of reaction is CaCO₃ → CaO + CO₂, Noah?
- Single replacement
- Decomposition
- Synthesis
8.
What type of reaction is Zn + 2 HCl → ZnCl₂ + H₂, Pia?
- Single replacement
- Double replacement
- Synthesis
9.
What happens in a synthesis reaction, Ren?
- Two compounds trade partners
- One compound splits apart
- Substances join into one product
10.
Which reaction type always has oxygen gas as a reactant, Tala?
- Combustion
- Double replacement
- Decomposition

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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