JDES Physical and Chemical Changes

Front

A student mixed two substances in a test tube and noticed that the test tube became warm and an odor was coming from it. What was most likely occurring inside the test tube?

Back

The substances were undergoing a chemical reaction.

Front

Which of the following models a physical change? Options: An apple ripens and turns red, A nail rusts and becomes reddish brown, A hamburger is cooked and turns brown, A red apple is cut in half.

Back

A red apple is cut in half.

Front

A chemical reaction is occurring for certain when

Back

new substance is formed.

Front

What was demonstrated by the melting ice pack after Billy injured his ankle?

Back

a physical change

Front

What kind of change takes place when charcoal burns and leaves ashes?

Back

A chemical change has occurred.

Front

How will adding water to a container with a mixture of salt and sand help to separate them?

Back

Salt will dissolve in water, and sand will not.

Front

What will happen if water heats on a stove long enough?

Back

The water will evaporate.

Front

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

• leaves burning
• plant decaying
• ice melting
• nail rusting

Back

ice melting

Front

What happens to water after it is heated for 10 minutes?

Back

It started to boil, and the liquid in the pot started to evaporate into a gas.

Front

Which process is NOT the result of a chemical change during a reaction? Options: digesting food, burning wood, rusting metal, folding paper

Back

folding paper