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Question 17N.1.SL.TZ0.19

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.1.SL.TZ0.19
Level SL Paper 1 Time zone TZ0
Command term Deduce Question number 19 Adapted from N/A
19.
[Maximum mark: 1]
17N.1.SL.TZ0.19

An experiment was set up so that each test tube contained water at a pH of 6.3 and a pH indicator. Test tubes 1 and 2 also contained a common pond autotroph. Carbon dioxide dissolves in water and forms carbonic acid. After three days the four test tubes were found to have these results.

What conclusion can be drawn from test tube 1 and test tube 2?

[1]

Markscheme

A

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