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Eighth Grade (Grade 8) Science Questions

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Grade 8 Physics
The rate of reaction informs us about                                       .
  1. How slow or fast the reaction proceeds
  2. Matter is conserved
  3. Products formed from the reactants
  4. The direction of a reaction
Grade 8 Physics
Chemical changes can be indicated by                                .
  1. Change in color
  2. Change in temperature
  3. Formation of gas or precipitate
  4. All of these
Grade 8 Physics
Potassium metal combines with chlorine gas to form potassium chloride. Which of the following shows that reaction?
  1. 2K+Cl2→2KCl
  2. 2K+2H2O→2KOH+H2
  3. CO2+H2O→H2CO3
  4. H2+Cl2→2HCl
Grade 8 Physics
Which of the following is an inexhaustible source of energy?
  1. water
  2. nuclear fuel
  3. petroleum
  4. coal
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