Which of the following is an example of a chemical change?
A.
Releasing compressed gas to make a bottle-rocket launch
B.
Adding water to clay to make slip
C.
Crystalizing honey to make candy
D.
Including baking soda in a recipe to make it less sour
The correct answer is:
D. Including baking soda in a recipe to make it less sour
Explanation: A chemical change involves a chemical reaction, resulting in the formation of one or more new substances with different properties. When baking soda (a base) is included in a recipe, it reacts with acidic ingredients to neutralize them, which is a chemical reaction that alters the chemical composition of the ingredients.
- A. Releasing compressed gas to make a bottle-rocket launch: This is a physical change, as it involves the expansion of gas but no new substances are formed.
- B. Adding water to clay to make slip: This is a physical change, as the clay and water mix but do not form a new substance.
- C. Crystalizing honey to make candy: This is a physical change, as it involves the change in physical state (from liquid to solid) without altering the chemical structure of the honey.