Study the investigative setup below and answer the questions that follow.

Question

16

Question 3.3.1 [2 marks]
Write an investigative question for this investigation.
Question 3.3.2 [2 marks]
Write a suitable hypothesis for this investigation.
Question 3.3.3 [2 marks]
What does the soda-lime and sodium hydroxide do?
Question 3.3.4 [1 mark]
Which test tube is considered the control of the investigation? Question 3.3.5 [2 marks]
What happened to the lime water in test tube D? Why did this happen?

Answer 1

Question 3.3.1: How does the presence of different substances affect the color change in the limewater solution?

Question 3.3.2: If different substances are added to limewater solution, then the color change will vary based on the acidity or basicity of the substances.

Question 3.3.3: The soda-lime and sodium hydroxide are used to absorb carbon dioxide from the air in the test tubes, which helps to keep the limewater solution clear.

Question 3.3.4: Test tube A with just limewater is considered the control of the investigation.

Question 3.3.5: The lime water in test tube D turned milky, indicating the presence of carbon dioxide. This happened because the substance added to test tube D released carbon dioxide when it reacted with the limewater solution.