Physical/Chemical Changes Flashcard Review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and includes processes like rusting, burning, and cooking.

Front

Example of a physical change: Ice melting.

Back

Ice melting is a physical change because it changes from solid to liquid without changing its chemical structure.

Front

Example of a chemical change: Cake batter baked in an oven.

Back

Baking cake batter is a chemical change because it undergoes a chemical reaction to form a new substance (cake) that cannot be reverted to its original ingredients.

Front

What happens during rusting?

Back

Rusting is a chemical change where iron reacts with oxygen and moisture to form iron oxide (rust), a new substance.

Front

Is shattering a glass bottle a physical or chemical change?

Back

Shattering a glass bottle is a physical change because the glass is broken into pieces but its chemical composition remains the same.

Front

What is an example of a chemical change involving gas production?

Back

Bubbling during a reaction, such as vinegar reacting with baking soda, is an example of a chemical change that produces gas.

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What is an example of a physical change involving a solution?

Back

Dissolving sodium hydroxide in water is a physical change because it forms a solution without changing the chemical identity of sodium hydroxide.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.