Week 8 Flashcard: Chemical vs. Physical Changes

Front

What is evidence that a chemical change has occurred?

Back

A new substance is formed.

Front

Has a chemical reaction taken place when an ice cube melts in a glass of water?

Back

No, a phase change does not always indicate a chemical reaction.

Front

Which of the following is an example of a chemical change?

• Rust forming on your bike.
• A popsicle melting in the sun.
• Rolling a ball of dough into a flat pizza.
• Boiling a pot of water.

Back

Rust forming on your bike.

Front

Which of the following is an example of a physical change?

• Rust forming on your bike.
• Sugar turning into caramel.
• Rolling a ball of dough into a flat pizza.
• Plants changing sunlight, water, and carbon dioxide into glucose and oxygen.

Back

Rolling a ball of dough into a flat pizza.

Front

Baking soda and vinegar chemically change. What evidence supports a chemical change?

Back

A gas is produced

Front

A change in chemical structure, resulting in a new substance

Back

Chemical Change

Front

Which example best describes a physical change? Options: baking a pie, burning a candle, making a paper airplane, lighting a match

Back

making a paper airplane