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You can create printable tests and worksheets from these Grade 8 Reactions questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.

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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.
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.
Which of the following is the product in the chemical formula $N+O_2=NO_2$?
1. $NO_2$
2. $O$
3. $O_2$
4. $N$
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
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
Energy is taken in
1. exothermic
2. electromagnetic
3. endothermic
4. weight
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
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