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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
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 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
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
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
What does a neutralization reaction produce?
  1. Acids
  2. Bases
  3. water and Salt
  4. carbonated water
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 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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