Equilibrium II | Edexcel A-Level Chemistry (9CH0)
Equilibrium II
- 23 questions
- 2 subtopics
- Paper 1: advanced inorganic and physical chemistry
- Paper 1 and Paper 3
Covers partial pressures and the equilibrium constant Kp, and which conditions change its value and which only move the position of equilibrium..
It covers partial pressures and Kp and calculating Kp and the effect of conditions.
Sample questions from Equilibrium II
Answer each one closed book first, then open the answer.
-
Partial pressures and Kp
What do the mole fractions of all the gases in a mixture add up to?
Show the answer
1. -
Partial pressures and Kp
Which species are included in a Kp expression?
Show the answer
Only gases; pure solids and pure liquids are omitted. -
Calculating Kp and the effect of conditions
How is the total number of moles of gas used when calculating partial pressures?
Show the answer
It is used to find each mole fraction before multiplying by the total pressure. -
Calculating Kp and the effect of conditions
Does altering a concentration change K?
Show the answer
There is no effect on the value.
The 2 subtopics
One subtopic is one session. Work down the list.
| Subtopic | What it covers | Questions |
|---|---|---|
| Partial pressures and Kp | Recall questions on mole fraction and partial pressure, on writing a Kp expression, and on the units it takes. | 10 |
| Calculating Kp and the effect of conditions | Finding equilibrium amounts to calculate Kc and Kp, working out their units, why only temperature changes the value of K and how it moves for exothermic and endothermic reactions, and what a large K says about the position of equilibrium. | 13 |
How the guide is worked
Answering a question from memory stores it far better than reading the answer again. The guide runs that as a fixed procedure on one subtopic at a time, about twenty minutes a session.
-
Step 1 · Closed book
Cover the answers. Work through one subtopic and write down what you can. Leave blanks where you have nothing.
-
Step 2 · Open book
Go back to the top. Read each printed answer and write it out in full, including the ones you had right.
-
Step 3 · Closed book again
Same questions, same order, from memory. The gap between pass one and pass three is the session result.
Read the full method, the return schedule and the research behind it.
Nearby topics
Edexcel A-Level Chemistry Active Recall Guide
Every topic, not just this one. 1,534 questions with their answers.