GCSE AQA Chemistry Identification of Common Gases: This question is about algae.

A

Question

This question is about algae.

A student:
- placed algae in water containing dissolved carbon dioxide
- shone bright light on the algae.

Gas bubbles were collected as the algae photosynthesised.

1. Describe a test that would identify the gas collected.
   Give the result of the test.

Test _____________
   Result _____________

2. Glucose is produced when algae photosynthesise.
   Name two naturally occurring polymers produced from glucose.
   _____________________ and _____________________

3. How many functional groups are there in the molecule in Figure 6? (Tick (✓) one box.)
   1 [ ]  2 [ ]  3 [ ]  4 [ ]

4. Glycine reacts by condensation polymerisation to produce a polypeptide and one other substance.
   Name the other substance produced.
   _____________________

5. Scientists think that algae may have used gases in Earth's early atmosphere.
   Algae need an element to produce the molecule in Figure 6 which is not present in water or carbon dioxide.
   Which two gases from Earth's early atmosphere could have provided this element?
   _____________________ and _____________________

6. The development and function of algae are controlled by a naturally occurring polymer.
   Figure 7 represents the shape and structure of this polymer.
   Describe the shape and structure of this polymer.

This question is about algae - AQA - GCSE Chemistry - Question 9 - 2020 - Paper 2

Worked Solution & Example Answer:This question is about algae - AQA - GCSE Chemistry - Question 9 - 2020 - Paper 2

Describe a test that would identify the gas collected. Give the result of the test.

Name two naturally occurring polymers produced from glucose.

How many functional groups are there in the molecule in Figure 6?

Name the other substance produced.

Which two gases from Earth's early atmosphere could have provided this element?

Describe the shape and structure of this polymer.

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