reversible and irreversible changes

Front

What is a reversible change?

Back

A reversible change is a process in which materials can change back to their original state. For example, melting ice can turn back into water.

Front

What is an irreversible change?

Back

An irreversible change is a process that creates new substances and cannot be reversed. For example, cooking an egg.

Front

Is melting chocolate a reversible or irreversible change?

Back

Melting chocolate is a reversible change because it can solidify again when cooled.

Front

Is cooking pancakes a reversible or irreversible change?

Back

Cooking pancakes is an irreversible change because you cannot turn the cooked pancakes back into the original batter.

Front

What happens to water vapor when it cools down?

Back

Water vapor turns into water droplets, which is a reversible change.

Front

What is the process of ice turning into water called?

Back

The process of ice turning into water is called melting.

Front

Can you name a process that is irreversible?

Back

Burning paper is an irreversible process because it creates ash and smoke, which cannot be turned back into paper.

Front

What is an example of a reversible change in cooking?

Back

An example of a reversible change in cooking is freezing and thawing fruits.

Front

What happens during heating in terms of state changes?

Back

Heating can cause solids to melt into liquids, which is a reversible change.

Front

What is an example of an irreversible change in nature?

Back

Rusting of iron is an example of an irreversible change because it creates rust, which cannot be turned back into iron.