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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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Answer:

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.

pstnonsonjoku

A chemical change often involves cues such as evolution of a gas, appearance of a solid or change in color.

A chemical change is said to occur when there is an alteration in the composition of a substance(s) undergoing the change. When this occurs, a new substance(s) is/are formed.

Certain cues can signal the occurrence of a chemical change such as;

  • a precipitate is formed
  • an unexpected change in color
  • the formation of gas bubbles
  • smoke begins to form
  • the substance becomes very cold
  • the odor changes

Learn more: https://brainly.com/question/6284546

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