2.6 Physical Change

2.6 Physical Change

Multiple Choice

What are the three states of matter?

• gas, liquid, mass
• solid, liquid, gas
• mass, solid, magnet
• gas, temperature, solids

Multiple Choice

An example of a physical property wold be?

• rust
• world war 1
• change of state
• Asia

Learning Objectives

• Define physical change.

• Give examples of physical changes.

Multiple Choice

What kind of change occurs if matter changes in amount, size, or shape?

• substance change

• chemical change

• physical change

• elemental change

Physical Change

• A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.

• Melting is an example of a physical change.

• Physical changes can be reversible or irreversible

Multiple Choice

which of these example is a physical change?

Reversible or Irreversible

• The melted ice cube may be refrozen, so melting is a reversible physical change

• Physical changes that involve a change of state are all reversible.

• Other changes of state include vaporization (liquid to gas), freezing (liquid to solid), and condensation (gas to liquid).

• When a piece of wood is ground into sawdust, that change is irreversible since the sawdust could not be reconstituted

  into the same piece of wood that it was before.

• Cutting the grass or pulverizing a rock would be other irreversible changes

Multiple Choice

The change happening in the picture is...

• Irreversible

• Reversible

• Changes

Multiple Choice

What is an irreversible change?

• Something you can change back.

• Something you cannot change back.

Summary

• A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.

• In a reversible physical change, the original form of the matter can be restored.

• In an irreversible physical change, the original form cannot be restored.

• Melting ice and grinding wood into sawdust are examples of physical changes.