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Which process represents a chemical change?



A. A lake freezes over into ice.
B. A metal bar is rolled into a flat sheet
C. Vinegar bubbles when baking soda is added.
D. Sand, water and salt combined to form a mixture.

This question is part of East Semester Exam
Asked by Sophie, Last updated: Apr 07, 2020

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2 Answers

E. Austin

E. Austin

Answered Nov 27, 2018

Option C - vinegar bubble when baking soda is added is a chemical change and it is correct.
Chemical change is a chemical reaction that occur when a substance combine with another to form a new substance. Chemical reactions are not reversible except by further chemical reactions. The options above, only option C is a Chemical change.

A lake freezes to ice is a physical change and can be turned back to water. A metal bar is rolled into a flat sheet can be reversed back to its normal state. Sand, water and salt combined to form a mixture is also a physical change.

 

aacosta

Aacosta

Answered Mar 07, 2018

Vinegar bubbles when baking soda is added.
 

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