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Cooking Chemistry Explorations

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Cooking Chemistry Explorations

Help Layla investigate what happens to ingredients in the kitchen. Read each clue carefully. Changes can be physical (the material changes form) or chemical (new substances form). Never heat or taste anything for this worksheet.

Ingredients and states of matter

Use what you know about solids, liquids and gases.

1.At breakfast, Layla sees an ice cube, milk, and steam rising from a warm mug. Match each to its state of matter.
  • Ice cube
  • Milk
  • Steam
  • Liquid
  • Solid
  • Gas
2.Which two items are liquids at room temperature? Choose two.
  • Cooking oil
  • Flour
  • Honey
  • Ice
3.Water in a saucepan gets hot enough to boil. What happens to some of the liquid water?

What kind of change?

A physical change does not make a new substance. A chemical change makes new substances and is often hard to reverse.

4.Layla melts a chocolate square. Is this a physical change or a chemical change? Explain what happens to the chocolate.
5.Layla cracks an egg and cooks it in a pan. Is the change to the egg reversible or irreversible? Give one reason.
6.Classify each kitchen event as a physical or chemical change: melting butter; baking a cake; freezing juice into an ice block; toasting bread.
  • Melting butter
  • Baking a cake
  • Freezing juice into an ice block
  • Toasting bread
  • Chemical change
  • Physical change
  • Physical change
  • Chemical change
7.A recipe mixes flour, milk and eggs into batter, then bakes it into a cake. Which part clearly makes new substances: mixing the batter or baking the cake?
  • Mixing the batter
  • Baking the cake
  • Both make no changes

Be a kitchen chemist

Use evidence from the changes to explain your thinking.

8.A pan of water is left in a freezer and becomes ice. What state change has happened, and is it usually a physical or chemical change?
9.Imagine butter melting on warm toast. Describe one observation that shows a physical change and name the change.
10.Complete the science idea in your own words: Cooking is like chemistry because… Include one example of a change that happens when food is cooked.

3 printable pages

  • Cooking Chemistry Explorations, page 1 of 3: Ingredients and states of matter

    Page 1

  • Cooking Chemistry Explorations, page 2 of 3: What kind of change?

    Page 2

  • Cooking Chemistry Explorations, page 3 of 3: Be a kitchen chemist

    Page 3

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