Worksheet: Heating and Cooling: Reversible and Irreversible Changes

In this worksheet, we will practice identifying changes to substances caused by heating and cooling and recognizing whether these changes are reversible.

Q1:

What is the process of changing a liquid to a solid called?

Chocolates with heart shape-72 ppi
  • AMelting
  • BEvaporation
  • CCondensation
  • DSolidifying

Q2:

If we fry an egg, it changes from a liquid to a solid. Once the egg is cooked, it can not be changed back into a liquid.

What name is given to a change that can not be reversed (changed back)?

  • AIrreversible
  • BReversible

Q3:

Fill in the blank: Burning a firework is a/an change.

Hand holding a burning sparkler firework bengal light-72 ppi
  • Areversible
  • Birreversible

Q4:

The image shows a cooking pot of water that has been heated on a stove. What happens when water is heated to a high temperature?

Cooking pot of water - 72 ppi
  • AThe water changes into ice.
  • BThe water changes into steam.
  • CThe water stays the same.

Q5:

What is the process of changing a solid to a liquid called?

Melting chocolate-72 ppi
  • AMelting
  • BSolidifying
  • CEvaporation
  • DFreezing

Q6:

What causes water to change into ice?

  • AFreezing it
  • BHeating it

Q7:

What happens to a snowman when the temperature outside rises?

  • AThe snowman melts.
  • BThe snowman freezes.

Q8:

What causes butter to melt?

  • AHeating it
  • BCooling it

Q9:

The popsicle is changing from a solid to a liquid. What is the change from a solid to a liquid called?

Melted Popsicle-72 ppi
  • AFreezing
  • BEvaporating
  • CMelting

Q10:

What has happened to the water on the tree?

Ice on tree
  • AThe water has melted.
  • BThe water has frozen.

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