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Grade 9 Chemical Reactions Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Chemistry

Unit 4: Chemical ReactionsReactions & Conservation of MassNGSS HS-PS1-2

Reactants and products, types of chemical reactions, and signs that a reaction has happened. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Chemical Reactions

Grade 9 · Chemistry

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Name

Class

Date

Learning goal: Reactions & Conservation of Mass · NGSS HS-PS1-2

Directions: Read each question carefully. Circle the correct choice or write your answer on the line.

Example

Is rusting a physical change or a chemical change?

Answer: a chemical change

RememberTypes of reactions

SynthesisA + B → ABDecompositionAB → A + BSingle replacementA + BC → AC + BDouble replacementAB + CD → AD + CBCombustionfuel + O₂ → CO₂ + H₂ONeutralizationacid + base → salt + water
  1. 1

    What substance speeds up a reaction without being used up?

  2. 2

    Balance this equation: H₂ + O₂ → H₂O

  3. 3

    Is burning wood exothermic or endothermic?

    ExothermicEndothermic
  4. 4

    What law says matter can't be created or destroyed in a reaction?

  5. 5

    What do we call a reaction that releases heat?

  6. 6

    What does an arrow mean in a chemical equation?

  7. 7

    Is baking a cake a physical change or a chemical change?

  8. 8

    Name two ways to make a reaction go faster.

  9. 9

    If 10 g of reactants react completely in a sealed container, what is the mass of the products?

  10. 10

    What do we call the new substances formed by a chemical reaction?

  11. 11

    Is melting ice a physical change or a chemical change?

  12. 12

    What do we call a reaction that absorbs heat?

★ Challenge corner for fast finishers

If you could fold a sheet of paper 42 times, roughly how thick would it be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/9/chemistry_reactions

Answer key (click to show)
  1. 1.a catalyst
  2. 2.2H₂ + O₂ → 2H₂O
  3. 3.exothermic
  4. 4.the law of conservation of mass
  5. 5.exothermic
  6. 6."produces" or "yields"
  7. 7.a chemical change
  8. 8.raise the temperature, increase concentration, use smaller pieces (more surface area), or add a catalyst (any two)
  9. 9.10 g (mass is conserved)
  10. 10.products
  11. 11.a physical change
  12. 12.endothermic
  13. ★far enough to reach the Moon (about 440,000 km) (challenge corner)

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