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Reactions Questions - All Grades

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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 7 Reactions
A chemical change                          .
  1. always can be reversed
  2. never will change state
  3. never can be reversed
  4. cannot be reversed easily
Grade 10 Reactions
To balance a chemical equation, you may adjust the
  1. coefficients.
  2. subscripts.
  3. formulas of the product.
  4. either of coefficients or subscripts.
Grade 10 Reactions
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 6 Reactions
The substances that go into a reaction are called the
  1. reactants.
  2. chemicals.
  3. questions.
  4. products.
Grade 11 Reactions
You know that you have a balanced chemical equation when the
  1. coefficients of the reactants equal the coefficients of the products.
  2. number of atoms of each element in the reactants equal that of each corresponding element in the products.
  3. products and reactants are the same chemicals.
  4. subscripts of the reactants equal the subscripts of the products.
Grade 11 Reactions
Which of the following must always be true for any kind of chemical reaction?
  1. The masses of the products and the reactants are equal.
  2. The mass of the products is greater than that of the reactants.
  3. The number of atoms in the reactants must change when products are formed.
  4. The reactants require the absorption of heat for a reaction to occur.
Grade 8 Reactions
A substance that undergoes a change in a chemical reaction is
  1. a substance.
  2. a reactant.
  3. an enzyme.
  4. a chemical.
Grade 5 Reactions
Which is a chemical reaction?
  1. paper tears
  2. sugar dissolves
  3. water boils
  4. paper burns
Grade 11 Reactions
Based on the Law of Conservation of Mass, we know that the mass of the reactants
  1. always be more than the total mass of the products.
  2. always be less than the total mass of the products.
  3. sometimes be more and sometimes be less than the total mass of the products.
  4. always be equal to the total mass of the products.
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