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Reactions Questions - All Grades

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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
What type of reaction always releases energy?
  1. endothermic
  2. exothermic
  3. decomposition
  4. oxidation-reduction
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 11 Reactions
All of the following are clear indicators that a chemical change has occurred EXCEPT for what?
  1. the formation of a precipitate
  2. the production of a gas (bubbles)
  3. heat and light
  4. a change in the total mass of substances
Grade 8 Reactions
The only sure evidence for a chemical reaction is
  1. the formation of a gas.
  2. production of one or more new substances.
  3. color change.
  4. changes in properties.
Grade 5 Reactions
Which is a chemical reaction?
  1. paper tears
  2. sugar dissolves
  3. water boils
  4. paper burns
Grade 8 Reactions
What is the term used to describe a physical or chemical change in which energy is given off?
  1. exothermic
  2. endothermic
  3. change of state
  4. none of the above
Grade 8 Reactions
The minimum amount of energy needed to start a reaction is the                   .
  1. chemical energy
  2. endothermic energy
  3. exothermic energy
  4. activation energy
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 10 Reactions
What is a reaction in which a compound breaks down into two or more simpler substances?
  1. decomposition
  2. oxidation
  3. reaction
  4. reduction
Grade 9 Reactions
In chemical reactions, atoms are                .
  1. created
  2. destroyed
  3. rearranged
  4. neutralized
Grade 8 Reactions
What is an endothermic reaction?
  1. A reaction where energy is absorbed.
  2. A reaction where energy is released.
  3. A reaction where the energy is not changed.
  4. A reaction where the energy is multiplied.
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