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Reactions Questions - All Grades

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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 8 Reactions
Which of the following is an indicator of a chemical change or reaction?
  1. a solid dissolves
  2. a new substance is formed
  3. water turns to steam
  4. a mixture is made
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 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 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 11 Reactions
In all chemical equations, the products' collective mass                                                              .
  1. is less than the reactants' total mass
  2. is greater than the reactants' total mass
  3. is equal to the reactants' total mass
  4. has no quantitative relationship to the reactants' total mass
Grade 10 Reactions
Which of the following statements is/are true?
  1. The total mass of the substance remains same in a chemical change.
  2. A chemical change is permanent and irreversible.
  3. A physical change is temporary and reversible.
  4. All the these.
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