HMH Unit 2.3 Pgs 128-130

HMH Science Unit 2.3

Pgs 128-130

Ch, Ch, Ch, Changes

One of the ways matter can be changed is in how it looks. It can be scribbled with pencil and change color.

It can be cut into many pieces.

It can be bent into a different shape

Ch, Ch, Ch, Changes

• The matter itself is still the same.

• This type of change is called a physical change.

• The key to a physical change is that nothing new is made.

Multiple Select

Physical changes happen when matter changes _____, ______, or ______.

• burning

• color

• shape

• size

• cutting

Multiple Choice

An example of a physical change is ______ a piece of wood.

• burning

• cutting

• temperature

• shape

Multiple Choice

In a physical change, no new ______ is made.

• makeup

• color

• matter

• flammability

Melting and Freezing

• Remember that matter can exist in different states.

• Solids, liquids and gases are the three most common states of matter. These states are also important to know when thinking about physical changes.

• Moving from one state to another is an example of a physical change.

Melting and Freezing

• The thing to keep in mind when looking at these changes of state is that NO NEW MATTER IS MADE.

• The matter you started with is still there, just in a different form.

Freezing and Melting

• Freezing and melting are two common physical changes.

• When you freeze a liquid, the cold slows down the particles in it.

• Remember that solids have very slow moving particles.

• Freezing a liquid changes it into a solid.

Freezing and Melting

• When you take a solid out of the freezer and warm it up, it is called melting.

• When the temperature is warmer, the particles start to move faster.

• This changes the solid into a liquid.

Open Ended

How does orange juice compare in its liquid state to its solid state? Answer in complete sentences.