Physical and Chemical Changes Reading

What is a physical change?

• A change in form without changing identity

• A change that results in a new substance

• A change that involves energy release

• A change that cannot be reversed

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

• Melting ice

• Dissolving sugar in water

• Rusting of iron

• Freezing water

What happens when vinegar and baking soda are mixed?

• They form a new substance, carbon dioxide gas

• They dissolve into each other

• They form a precipitate

• They change color

What indicates a chemical change when two solutions are mixed?

• Formation of a precipitate

• Dissolving of substances

• Change in color

• Evaporation of water

Which of the following is true about chemical changes?

• They are usually not reversible

• They do not involve energy changes

• They can be easily reversed

• They do not form new substances