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Ninth Grade (Grade 9) Reactions Questions

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Grade 9 Reactions
Identify the reactant(s) in the chemical reaction: CO2+H2O→H2CO3.
  1. CO2
  2. CO2andH2O
  3. CO2,H2O,andH2CO3
  4. H2CO3
Grade 9 Reactions
Which is an example of a chemical reaction?
  1. ice melting
  2. wood burning
  3. glass breaking
  4. sugar dissolving in water
Grade 9 Reactions
A chemical reaction is likely to occur spontaneously if it
  1. has more reactants than products.
  2. has more products than reactants.
  3. releases energy.
  4. absorbs energy.
Grade 9 Reactions
Which of the following is NOT a sign of a chemical change occurring?
  1. change in color
  2. new substance is produced
  3. change in size
  4. hard to reverse
Grade 9 Reactions
If a reaction in one direction releases energy, the same reaction in the other direction
  1. also releases energy.
  2. cannot occur.
  3. destroys energy.
  4. requires energy.
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