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Eighth Grade (Grade 8) Reactions Questions

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Grade 8 Reactions
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
  1. This is a physical change.
  2. This is a chemical change.
  3. Iron and iron oxide have the same properties.
  4. Oxygen and iron have similar properties.
Grade 8 Reactions
What law says that nothing can be created or destroyed in a reaction?
  1. The Law of Physics
  2. The Law of Conservation and Mass
  3. The Law of Chemistry
  4. The Law of Conserving Chemical Reactions
Grade 8 Reactions
Which of the following is the product in the chemical formula [math]N+O_2=NO_2[/math]?
  1. [math]NO_2[/math]
  2. [math]O[/math]
  3. [math]O_2[/math]
  4. [math]N[/math]
Grade 8 Reactions
Energy is taken in
  1. exothermic
  2. electromagnetic
  3. endothermic
  4. weight
Grade 8 Reactions
A chemical equation that shows the same number of each kind of atom is considered to be
  1. balanced
  2. unbalanced
  3. an incomplete reaction
  4. a replacement reaction
Grade 8 Reactions
Grade 8 Reactions
Grade 8 Reactions
In an exothermic reaction, energy is transferred from
  1. the reactants to the surrondings
  2. surronding to the reactants
  3. one to another reactant
  4. the container it was in
Grade 8 Reactions
What does a neutralization reaction produce?
  1. Acids
  2. Bases
  3. water and Salt
  4. carbonated water
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 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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