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Kitchen Chemistry Project Presentations

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Kitchen Chemistry Project Presentations

Use the case study and data below to analyse a kitchen reaction, then plan a short scientific presentation. Show how evidence supports your explanations. Do not taste experimental mixtures; follow laboratory safety procedures.

Case study: why does apple turn brown?

Wiremu is preparing apple slices for a fruit salad. She notices that slices left in air develop a brown surface, while slices treated with lemon juice stay pale for longer. Apple browning is a series of oxidation reactions: enzymes in damaged apple tissue help oxygen react with compounds in the apple, producing brown pigments. Lemon juice slows browning because its acidity changes the conditions for the enzyme, and its antioxidants can react with oxygen-related compounds. Cooling also slows the reaction. Wiremu tests equal-sized apple slices under four conditions. Each slice is left for 20 minutes. Browning is rated from 0 (none) to 5 (very dark).

Treatment

Browning score after 20 min

Room-temperature apple, exposed to air

Room-temperature apple, coated with lemon juice

Chilled apple, exposed to air

Room-temperature apple, coated with water

Interpret the evidence

Use details from the case study and results in your answers.

1.Which condition produced the least browning, and what was its score?

2.What is the independent variable in Wiremu’s comparison, and what outcome did she measure?

3.Why is the water-coated slice a useful comparison when considering the effect of lemon juice?

4.Select the best explanation for the chilled slice’s score of 2.

Cooling generally slows enzyme-controlled reaction rates.
Cooling adds oxygen to the apple.
Chilling turns the brown pigment back into apple tissue.
The result proves temperature has no effect.

5.The room-temperature untreated slice and the water-coated slice both scored 4. Does this prove that water has no effect in every situation? Explain one limitation of this evidence.

6.Identify two variables that Wiremu should keep the same to make a fair comparison between treatments.

7.Wiremu wants to test whether lemon-juice concentration affects browning. Write a testable question and identify the independent variable.

8.Plan a reliable follow-up test of lemon-juice concentration. State what you would change, what you would measure, and how you would improve reliability.

9.For a presentation to a food science club, write a concise claim supported by two pieces of evidence from the results. Avoid claiming more than the data show.

10.Give one safety precaution and one limitation you would mention when presenting a kitchen chemistry investigation like this.

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More Science Worksheets

Kitchen Chemistry Project Presentations

Kitchen Chemistry Project Presentations

Case study: why does apple turn brown?

Interpret the evidence

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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