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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
A chemical equation is
  1. the process by which particles leave a liquid and become a gas.
  2. a substance made by a chemical reaction.
  3. a statement of chemical symbols that shows what happens during a chemical reaction.
  4. a change in which matter keeps the same chemical properties; a change in size, shape, volume, or state of matter.
Grade 8 Reactions
The only sure evidence for a chemical reaction is
  1. the formation of a gas.
  2. production of one or more new substances.
  3. color change.
  4. changes in properties.
Grade 8 Reactions
What is the term used to describe a physical or chemical change in which energy is given off?
  1. exothermic
  2. endothermic
  3. change of state
  4. none of the above
Grade 8 Reactions
The minimum amount of energy needed to start a reaction is the                   .
  1. chemical energy
  2. endothermic energy
  3. exothermic energy
  4. activation energy
Grade 8 Reactions
A substance that undergoes a change in a chemical reaction is
  1. a substance.
  2. a reactant.
  3. an enzyme.
  4. a chemical.
Grade 8 Reactions
What is an endothermic reaction?
  1. A reaction where energy is absorbed.
  2. A reaction where energy is released.
  3. A reaction where the energy is not changed.
  4. A reaction where the energy is multiplied.
Grade 8 Reactions
The 3 types of radioactive decay are                         .
  1. Alpha, Beta, and Isotope
  2. Alpha, Beta, and Zenith
  3. Alpha, Beta, and Kappa
  4. Alpha, Beta, and Gamma
Grade 8 Reactions
Which of these reactions releases thermal energy?
  1. unbalanced
  2. balanced
  3. exothermic
  4. endothermic
Grade 8 Reactions
Which of the following is a single replacement reaction?
  1. Al(NO3)3+MgSO4→Al2(SO4)3
  2. 2Na+CaCl2→2NaCl+Ca
  3. O2+2H2→2H2O
  4. 2H2O→2H2+O2
Grade 8 Reactions
In a reversible change matter
  1. cannot be changed back.
  2. can be changed back.
  3. is always liquid.
  4. does not exist.
Grade 8 Reactions
Which of these describes a catalyst?
  1. It is a reactant.
  2. It speeds up a reaction.
  3. It appears in the chemical equation.
  4. It can be used in place of an inhibitor.
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