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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 10 Reactions
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
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 10 Reactions
In what type of reaction does one reactant form two or more products?
  1. single replacement
  2. decomposition
  3. synthesis
  4. double replacement
Grade 9 Reactions
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
How are reactions related to chemical bonds?
  1. bonds in the reactants are broken and bonds in the products are formed
  2. bonds in the products are broken and bonds in the reactants are formed
  3. bonds are formed in both the reactants and products
  4. none of the above
Grade 10 Reactions
What type of reaction always releases energy?
  1. endothermic
  2. exothermic
  3. decomposition
  4. oxidation-reduction
Grade 10 Reactions
What is a reaction in which two or more substances react to form a single substance?
  1. single reaction
  2. synthesis reaction
  3. combustion
  4. none of the above
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.
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