Classify the following as physical or chemical changes. a....

Classify the following as physical or chemical changes. a. Mothballs gradually vaporize in a closet. b. A French chef making a sauce with brandy is able to burn off the alcohol from the brandy, leaving just the brandy flavoring. c. Hydrofluoric acid attacks glass, and is used to etch calibration marks on glass laboratory utensils. d. Calcium chloride lowers the temperature at which water freezes, and can be used to melt ice on city sidewalks and roadways. e. An antacid tablet fizzes and releases carbon dioxide gas when it comes in contact with hydrochloric acid in the stomach. f. Baking soda fizzes if mixed with vinegar. g. Chemistry majors usually get holes in the cotton jeans they wear to lab because of the acids used in many experiments. h. Whole milk curdles if vinegar is added to it. i. A piece of rubber stretches when you pull on it. j. Rubbing alcohol evaporates quickly from the skin. k. Acetone is used to dissolve and remove nail polish.

Classify the following as physical or chemical changes.
a. Mothballs gradually vaporize in a closet.
b. A French chef making a sauce with brandy is able to burn off the alcohol from the brandy, leaving just the brandy flavoring.
c. Hydrofluoric acid attacks glass, and is used to etch calibration marks on glass laboratory utensils.
d. Calcium chloride lowers the temperature at which water freezes, and can be used to melt ice on city sidewalks and roadways.
e. An antacid tablet fizzes and releases carbon dioxide gas when it comes in contact with hydrochloric acid in the stomach.
f. Baking soda fizzes if mixed with vinegar.
g. Chemistry majors usually get holes in the cotton jeans they wear to lab because of the acids used in many experiments.
h. Whole milk curdles if vinegar is added to it.
i. A piece of rubber stretches when you pull on it.
j. Rubbing alcohol evaporates quickly from the skin.
k. Acetone is used to dissolve and remove nail polish.

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Key Concepts

Chemical Change

A chemical change results in the formation of one or more new substances with different chemical properties from the original. This type of change occurs when chemical bonds are broken and new ones are formed, often accompanied by energy changes, such as the release of heat or light, and observable signs like color changes, gas evolution, or precipitation.

Physical Change

A physical change involves modifications in the state or appearance of a substance without altering its chemical composition. This can include changes like phase transitions (melting, freezing, evaporation) or changes in shape and size. In physical changes, the molecular structure remains intact, and the process is often reversible.

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