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Lesson 2/3: Creating a fair test V2

Last updated 3 months ago
5 questions
Note from the author:
A beverage company wants to stop using plastic straws, so the company designs a new lid. The new lid has a much bigger hole than the old lid.
Alex, a scientist at the company, is wondering how this might affect what happens with the liquid inside the cup.




A beverage company wants to stop using plastic straws, so the company designs a new lid. The new lid has a much bigger hole than the old lid.
Alex, a scientist at the company, is wondering how this might affect what happens with the liquid inside the cup.




Alex thought about how the liquid in the cup could change. She thought the amount of liquid might change over time. She created the investigation below to find the answer.

Experiment question: Does a lid affect the amount of the liquid in a cup over time?

Procedure:
  • Fill 2 cups with the same cold liquid
  • Put the old lid (small hole) on 1 cup
  • Put the new lid (large hole ) on 1 cup
  • Draw a line where the liquid level is on each cup
  • Wait 30 days
  • Measure the weight of the liquid
Required
1

Is Alex's test a fair test?

Alex wants to use the mass of the liquid as her dependent variable. Answer the questions below to help her improve the steps of her investigation.
Required
0.25

What should she measure before she starts the experiment?

Required
0.25

What should she measure after she ends the experiment?

Required
0.25

When should she measure the different cups?

Required
0.25

What else should Alex change about her procedure to make it a fair test.