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Chemical Reactions pt. 2

General questions about chemical reactions. 15 Questions.

 
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1

What has occurred when a new substance is formed?

  • physical change
  • chemical property
  • chemical change

2

What are the substances that exist before a chemical reaction occurs?

  • reactants
  • products
  • yields

3

Which of the following is not an example of a chemical reaction?

  • burning paper
  • enzymes in the body breaking down food
  • tearing a sheet of paper

4

In the following equation, which one is the product?H + S --> H2S

  • H
  • S
  • H2S

5

What are the substances formed after a chemical reaction has occurred?

  • reactants
  • products
  • coefficients

6

When balancing a chemical equation, which of the following is false?

  • Subscripts can never be changed.
  • Subtracting molecules is not possible.
  • Coefficients can only be added to the reactants.

7

What tells you the number of atoms of each element in a compound?

  • subscripts
  • coefficients
  • reactants

8

What is needed to start a chemical reaction?

  • products
  • activation energy
  • fire

9

What tells us how fast a reaction occurs?

  • rate of reaction
  • time
  • displacement

10

Which of the following would NOT increase the rate of reaction?

  • increasing the temperature
  • increasing the surface area
  • adding an inhibitor

11

What of the following is NOT true about catalysts?

  • speed up the rate of reaction
  • cause explosions
  • are not included in the chemical equation

12

Which of the following is true about enzymes?

  • they are catalysts
  • they are only found in chemicals
  • they can only speed up reactions

13

Which of the following is an example of an enzyme?

  • potato
  • hydrogen peroxide
  • catalase

14

What type of chemical reactions release heat?

  • Endothermic
  • Exothermic
  • Exergonic

15

Which of the following is an example of an endothermic reaction?

  • starting a fire
  • using a cold pack on an injury
  • metal rusting

 

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