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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
What new substances can be formed when table salt is added to copper and aluminum?
  1. copper (II) oxide and aluminum oxide
  2. copper (II) oxide and aluminum chloride
  3. copper (II) chloride and aluminum chloride
  4. copper (II) chloride and aluminum oxide
  5. none of the above
Grade 8 Reactions
Which of the following statements about chemical properties is true?
  1. They can be observed when the identity of a substance changes.
  2. They can always be observed without changing the identity of a substance.
  3. They are easier to observe than physical properties.
  4. They are the properties that are most useful in identifying a substance.
Grade 8 Reactions
Which of the following is a chemical reaction?
  1. making ice cubes
  2. baking a cake
  3. slicing a carrot
  4. boiling water
Grade 8 Reactions
Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?
  1. shredding a piece of paper into hundreds of tiny strips
  2. dropping a dinner plate on the floor
  3. melting ice cubes in a glass of juice
  4. burning a piece of paper to ashes in a fireplace
Grade 8 Reactions
What does a neutralization reaction produce?
  1. Acids
  2. Bases
  3. Water and a salt
  4. Carbonated water
Grade 8 Reactions
In an exothermic reaction, energy is transferred from
  1. the reactants to the surroundings.
  2. the surroundings to the reactants.
  3. one reactant to another.
  4. the container it was in.
Grade 8 Reactions
Define chemical reaction.
Grade 8 Reactions
What happens to the old molecules in a chemical reaction?
  1. They rearrange into new molecules.
  2. They stay the same.
  3. They are destroyed.
  4. They create new molecules to attach to.
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