Question 21
Question 21 of 40
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Periodic Table
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
6. Chemical reactions
6.3. Reversible reactions and equil...

State the sources of the hydrogen (methane) and nitrogen (air) in the Haber process

6. Chemical reactions
6.2. Rate of reaction

Describe and explain the effect on the rate of reactions of: (a) changing the concentration of solutions (b) changing the pressure of gases (c) changing the surface area of solids (d) changing the temperature (e) adding or removing a catalyst, including enzymes using collision theory