Physical Change and Chemical Change

Define a physical change.

A physical change occurs when the size or shape of matter is altered. The molecules remain unchanged. The initial substance still exists but only in a different form.

True or False A physical change is easy to reverse.

True

Name three examples of osmosis.

Water moving into a fish that lives in fresh water, water moving out a fish which lives in salt water and the absorption of water by plant roots are examples of osmosis.

List some examples of physical change.

Physical change involved tearing, breaking, grinding a state of matter, changing the state of matter and dissolving a substance.

What is a semi - permeable membrane?

A semi - permeable membrane is a membrane that allows certain substances to pass through.

Define a chemical change.

An chemical change occurs when a new substance is produced having different characteristics from the original substance.

Explain the difference between diffusion and osmosis.

Diffusion is the movement of molecules from an area if high concentration to an area of low concentration until balance is achieved while osmosis describes the movement of water molecules from an area of high concentration to low across a semi - permeable membrane.

Name three examples of diffusion.

The gaseous exchange in alveoli in lungs, the gaseous exchange in leaf and digestion are examples of diffusion.

Name some examples of a chemical change.

Some examples of chemical change is burning, rusting of iron, souring of milk and decaying of food.

Name the 3 basic ways in which molecules move in living systems.

They are diffusion, osmosis and active transport.