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Chemical Reactions - 8th grade

Students will answer questions pertaining to chemical reactions, formulas and equations. 10 Questions.

 
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1

Which of the following is an indicator that a chemical reaction has occurred?

  • Color change
  • Change in size
  • Gas produced

2

What are the substances that exist before a reaction occurs?

  • reactants
  • products
  • elements

3

What lists the reactants, products, physical states and proportions of each substance present?

  • chemical reaction
  • chemical equation
  • chemical formula

4

Which of the following cannot be used to describe a chemical reaction?

  • words
  • names
  • numbers

5

What are the small numbers written to the right of each element that indicate the number of molecules present?

  • mini numbers
  • exponents
  • subscripts

6

Which of the following absorb heat energy?

  • endothermic reactions
  • exothermic reactions
  • chemical reactions

7

Which substances are present after the reaction had occurred?

  • reactants
  • products
  • elements

8

Which of the following release heat energy?

  • endothermic
  • exothermic
  • chemical

9

What is something that speeds up the rate of a chemical reactions without being affected by the reaction?

  • chemical formula
  • reactants
  • catalysts

10

Which of the following is not included in a chemical equation?

  • reactants
  • time
  • words

 

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