Lesson Check Heat

HMH Unit 2.3 Lesson Check

Pgs 149-150

Physical Changes

• If a piece of matter undergoes a physical change, the matter you started with is the same as what you ended with.

• This includes cutting, bending, and other ways.

• When matter changes phases (e.g. solid to liquid), this is still a physical change.

Multiple Choice

Which phrase describes a physical change?

• bread baking

• trash rotting

• crumpling paper

• gas bubbles rising when mixing baking soda and vinegar

Multiple Choice

When matter changes _____ , it is a physical change.

• liquid

• phases

Multiple Choice

The temperature at which a solid becomes a liquid is called the _______.

• melting point

• boiling point

Multiple Choice

If the temperature keeps going up, the _______ will be reached.

• freezing point

• boiling point

Multiple Choice

If the boiling point is reached, the liquid will turn into a ______.

• gas

• solid

Chemical Change

• In a chemical change, new matter is created. We cannot get back what we started with.

• Signs of a chemical change are heat, light, smell, color change and others.

Multiple Select

Choose the items from a physical change.

• precipitate

• odor

• shape change

• phase change

• color change

Multiple Select

Choose the items from a chemical change.

• precipitate

• odor

• shape change

• phase change

• color change

Conservation of Matter

• Remember, what ever amount of matter we start with, we will have the same amount in the end.

• This is true for physical and chemical changes.

• In a chemical change, sometimes the matter escapes as a gas.

Multiple Choice

You leave a glass of ice outside on a sunny day. When the ice melts, it turns into water. What does the conservation of matter state about the weight of that water?

• It will weigh more than the ice

• It will weigh less than the ice

• It will weigh slightly more than the ice

• It will weigh the same as the ice

Multiple Choice

A physical change happens when matter changes its phase. Changing from a solid to a liquid is called _______.

• freezing

• melting

• energy

• matter

Multiple Choice

To melt something, this requires an input of ________.

• freezing

• melting

• energy

• matter

Multiple Choice

When a liquid changes back into a solid, _______ is removed.

• freezing

• melting

• energy

• matter