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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
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 $N+O_2=NO_2$?
1. $NO_2$
2. $O$
3. $O_2$
4. $N$
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
Energy is taken in
1. exothermic
2. electromagnetic
3. endothermic
4. weight
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
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