PencilGoGrade 2 · Science · Physical science
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Grade 2 Science Worksheet - Building Confidence
Write R or I.
Read this first
A reversible change (R) can be undone. Ice melts, and you can freeze the water again. An irreversible change (I) cannot be undone. A baked cake cannot turn back into batter.
Ice melting into water
Baking a cake
Water freezing into ice
Cooking an egg
Burning a log in a fire
Butter melting in a pan
Chocolate melting in the sun
Toasting a slice of bread
Heating and cooling can change a material, and sometimes the change can be undone and sometimes it cannot. Ice melts into water when it is warmed, and the water becomes ice again when it is cooled: that is a reversible change. A cake that is baked, an egg that is cooked or paper that is burned cannot go back to what it was: that is an irreversible change. This worksheet lists eight changes, one on each line, and your child writes R for reversible or I for irreversible.
Ask whether the change could be undone by cooling or heating the material again, and talk about what you have seen in the kitchen. Melting and freezing are the changes children know best, so start there, and then talk about why baking and burning are different. A tip at the top of the page explains the two letters.
NGSS standard: 2-PS1-4
Ice melting into water is R, because cooling the water turns it back into ice. Baking a cake is I, because a cake cannot turn back into batter.
Thinking every change caused by heat can be undone, even when the material has been cooked or burned.
Ask: can I get the original material back by heating or cooling it again?
Thinking every change caused by heat can be undone, even when the material has been cooked or burned.
Ask: can I get the original material back by heating or cooling it again?
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Similar: Properties of Matter · Material Tests for a Purpose
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