Changes in nature

What is the meaning of Irreversible ?

• Something that can return to it's normal shape

• Something that can't return to it's normal shape

What is the meaning of Reversible ?

• Something that can't return ti it's normal shape

• Something that can return to it's normal shape

When a stick of butter melts it changes from a...

• solid to gas
• gas to solid
• solid to liquid

Tags

NGSS.MS-PS1-4

Of the changes below, which is NOT an irreversible change:

• rusting

• cooking

• melting

• burning

Burning a candle is a type of reversible reaction.

• True

• False

Cooking an egg is what type of change?

• Irreversible

• Reversible

Melting chocolate is what type of change?

• Irreversible

• Reversible

The change happening in the picture is...

• Irreversible

• Reversible

• Changes

Tags

NGSS.MS-PS1-4

Which of these are irreversible changes?

• Salt dissolved in water.

• Plaster of Paris dissolved in water.

• Wood that has been burnt.

• An egg that has been boiled.

Tags

NGSS.MS-PS1-5

Which description best describes what happens when a material is burnt?

• The process is reversible.

• The process is irreversible: the original material is destroyed to

  produce new

• The material being burnt disappears.

• The material being burnt always turns completely into a

  gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5