Danielle pours lemon juice over a tablespoon of baking soda. At first, many bubbles form, but then they slowly stop forming. What is the BEST clue that this is a chemical change and not a physical change?

PHYSICAL SCIENCES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	The bubbles stop forming
B	Bubbles form without heating the liquid
C	The lemon juice and baking soda form a mixture
D	The mixture can be separated

Explanation:

Detailed explanation-1: -Sodium bicarbonate and acetic acid reacts to carbon dioxide, water and sodium acetate. The solid baking soda was placed in liquid vinegar producing carbon dioxide gas, which is evident because of the formation of bubbles in the foaming mixture.

Detailed explanation-2: -Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

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