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23 May, 02:54

Which of the following would be evidence that a chemical reaction has occurred? (Select all that apply.) *

a change in shape

a precipitate is formed

an unexpected change in color

the formation of gas bubbles

smoke begins to form

clear liquids remain clear

the odor changes

the substance becomes very cold

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Answers (2)
  1. 23 May, 03:25
    0
    An unexpected change in color, the odor changes, the temperature changes, precipitation is formed, formation of gas bubbles
  2. 23 May, 03:45
    0
    1) precipitate is formed

    2) unexpected color change

    3) formation of gas bubbles

    4) smoke forms

    5) odor change

    6) substance becomes cold

    Explanation:

    1/3) its a new substance.

    2/5) they are both changes to the original substance that cannot be reversed.

    4) where theres smoke theres fire, and burning is classified as a type of chemical change.

    6) it could possibly be an endothermic reaction, where it absorbs heat and the substance becomes cold.
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