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Grade 11 Chemical Reactions Worksheet with Answers

Grade 11 (US) · Year 12 (UK) · Class 11 (India) · Chemistry

Unit 3: ReactionsClassifying ReactionsNGSS HS-PS1-4

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 11 · Chemistry

Score___ / 12

Name

Class

Date

Learning goal: Classifying Reactions · NGSS HS-PS1-4

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

Example

Name one common sign that a chemical reaction has happened.

Answer: bubbles (gas), color change, temperature change, light, or a new smell (any one)

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 do we call a reaction that absorbs heat?

  2. 2

    What type of reaction happens when an acid and a base react to form salt and water?

  3. 3

    Is burning wood exothermic or endothermic?

    ExothermicEndothermic
  4. 4

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

  5. 5

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

  6. 6

    Name two ways to make a reaction go faster.

  7. 7

    Is rusting a physical change or a chemical change?

  8. 8

    What does an arrow mean in a chemical equation?

  9. 9

    Is melting ice a physical change or a chemical change?

  10. 10

    Balance this equation: H₂ + O₂ → H₂O

  11. 11

    What do we call a reaction that releases heat?

  12. 12

    What do we call the starting substances in a chemical reaction?

★ Challenge corner for fast finishers

Does a kilogram of feathers weigh more than a kilogram of iron?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/11/chemistry_reactions

Answer key (click to show)
  1. 1.endothermic
  2. 2.a neutralization reaction
  3. 3.exothermic
  4. 4.a chemical change
  5. 5.the law of conservation of mass
  6. 6.raise the temperature, increase concentration, use smaller pieces (more surface area), or add a catalyst (any two)
  7. 7.a chemical change
  8. 8."produces" or "yields"
  9. 9.a physical change
  10. 10.2H₂ + O₂ → 2H₂O
  11. 11.exothermic
  12. 12.reactants
  13. ★no — they weigh the same (challenge corner)

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