Heating and Cooling

Answer Key - Grade 2 Science Worksheet - Building Confidence

Write R or I.

1. Read this first

   Tip

   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.

2. 1.

   Ice melting into water R

3. 2.

   Baking a cake I

4. 3.

   Water freezing into ice R

5. 4.

   Cooking an egg I

6. 5.

   Burning a log in a fire I

7. 6.

   Butter melting in a pan R

8. 7.

   Chocolate melting in the sun R

9. 8.

   Toasting a slice of bread I