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Bath Bomb Chemistry Reactions

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Bath Bomb Chemistry Reactions

A bath-bomb maker wants to understand the fizz before designing a new recipe. Read the information, then solve the science clues. Do not taste or handle unknown chemicals.

Read the reaction story

A dry bath bomb contains two key ingredients: a white alkaline powder commonly used in baking and a food-grade acid found in citrus fruits. While the ingredients remain dry, their particles cannot move around enough to react quickly. When water is added, the substances dissolve and their particles meet. They react to make new substances, including a gas that is also released when people breathe out. The gas escapes as bubbles, creating the fizz. Sodium citrate and water are also products. The starting substances in a reaction are called reactants; the substances made are called products. Water helps this reaction happen, but it is not used up overall. Bath bombs are kept dry so they do not start reacting before bath time.

1.Choose the best description of a chemical reaction.
  • A substance changes shape but stays the same substance.
  • One or more new substances are formed.
  • A solid always melts into a liquid.
  • A substance is simply mixed without changing.
2.Select the two main reactants in the bath-bomb reaction.
  • Sodium bicarbonate and citric acid
  • Carbon dioxide and sodium citrate
  • Water and food colouring
  • Sodium citrate and citric acid
3.Complete the sentence: The gas that forms bubbles and makes the bath bomb fizz is .
4.In the reaction story, name one product other than the gas that causes the fizz.
5.True or false? Keeping a bath bomb dry helps prevent its fizzing reaction from starting early.
TrueFalse
6.Maryam puts the dry powders together and sees no fizz. She then adds water and sees bubbles. Explain why the water makes a difference.
7.A maker doubles the amount of citric acid but keeps the sodium bicarbonate amount the same. Predict what may happen to the fizz, and explain why the exact result depends on the recipe.
8.A student records these observations after adding water. Which observation is strongest evidence that a gas is being produced?
  • The powder is white.
  • Bubbles rise through the water.
  • The container is clear.
  • The mixture takes up space.
9.Put the events in the correct order by numbering them 1–3: products form; water is added and ingredients dissolve; particles meet and react.
10.Suggest one fair test a bath-bomb maker could use to investigate whether warmer water changes how quickly a bath bomb fizzes. State what to change and what to keep the same.

2 printable pages

  • Bath Bomb Chemistry Reactions, page 1 of 2: Read the reaction story

    Page 1

  • Bath Bomb Chemistry Reactions, page 2 of 2: 6. Maryam puts the dry powders together and sees no fizz. She then adds water and sees…

    Page 2

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