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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.
The substances that go into a reaction are called the
1. reactants
2. chemicals
3. questions
4. products
What type of chemical reaction is $P + O -> PO$?
1. synthesis
2. decomposition
3. single replacement
4. double replacement
In a chemical reaction
1. the mass of the reactants equals the mass of the products
2. the mass of the products is greater than the mass of the reactants
3. the number of atoms in the reactants and products must change
4. energy as heat must be added to the reactants
Taking an antacid is an example of what type of reaction?
1. Combustion
2. Neutralization
3. Energy
4. Decomposition
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
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. $N$