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Seventh Grade (Grade 7) Reactions Questions

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Grade 7 Reactions
A chemical change                          .
  1. always can be reversed
  2. never will change state
  3. never can be reversed
  4. cannot be reversed easily
Grade 7 Reactions
All chemical reactions in living things take place                   .
  1. in dry conditions
  2. in water solutions
  3. outside a membrane
  4. inside a membrane
Grade 7 Reactions
What is produced as a candle burns?
  1. carbon dioxide
  2. water vapor
  3. both of the above
  4. none of the above
Grade 7 Reactions
Which of the following will not increase the rate of a reaction?
  1. adding a catalyst
  2. increasing the temperature of a reaction
  3. decreasing the concentration of reactants
  4. grinding the solid into powder
Grade 7 Reactions
Which of the following describes a slow reaction with oxygen over time?
  1. burning
  2. melting
  3. rusting
  4. boiling
Grade 7 Reactions
When two substances react chemically to produce a new substance, what is TRUE of the mass of the two substances compared to the mass of the new substance?
  1. They have the same mass.
  2. The mass of the two substances is less than the mass of the single substance.
  3. The mass of the two substances is more than the mass of the single substance.
  4. None of the above.
Grade 7 Reactions
What is a process that produces chemical change?
  1. Oxidation
  2. Acetic acid
  3. Chemical Reaction
  4. None of the above