1.
State what is meant by enthalpy change. [1]
JD SCIENCE
Physical chemistry 2 — energetics, kinetics and equilibria
Answer all questions. Show working. Answers are in a separate file on the Worksheets page — do not look at them until you have finished.
2.
State what is meant by Hess's law. [1]
3.
State what is meant by mean bond enthalpy. [1]
4.
State what is meant by collision theory. [1]
5.
State what is meant by rate equation. [1]
6.
State what is meant by equilibrium constant Kc. [1]
7.
State what is meant by Le Chatelier. [1]
8.
State what is meant by a Born–Haber cycle. [1]
9.
State what is meant by entropy. [1]
10.
State what is meant by the rate-determining step. [1]
11.
Amira is asked about enthalpy change in a AQA Chemistry paper.
(a) Describe enthalpy change. [2]
(b) Explain why enthalpy change is important in this topic. [3]
12.
Amira is asked about Hess's law in a AQA Chemistry paper.
(a) Describe Hess's law. [2]
(b) Explain why Hess's law is important in this topic. [3]
13.
Amira is asked about mean bond enthalpy in a AQA Chemistry paper.
(a) Describe mean bond enthalpy. [2]
(b) Explain why mean bond enthalpy is important in this topic. [3]
14.
Amira is asked about collision theory in a AQA Chemistry paper.
(a) Describe collision theory. [2]
(b) Explain why collision theory is important in this topic. [3]
15.
Amira is asked about rate equation in a AQA Chemistry paper.
(a) Describe rate equation. [2]
(b) Explain why rate equation is important in this topic. [3]
16.
Amira is asked about equilibrium constant Kc in a AQA Chemistry paper.
(a) Describe equilibrium constant Kc. [2]
(b) Explain why equilibrium constant Kc is important in this topic. [3]
17.
Q=mcΔT. 100 g, c=4.18, ΔT=5.0 [3]
18.
ΔH = −Q/n. Q=2090 J, n=0.010 [3]
19.
Kc = [C]²/[A][B]. If all conc=2 [3]
20.
A first-order half-life is 20 s. k [3]
21.
Bonds broken 1200, made 1500. ΔH [3]
22.
If T doubles and k increases, Ea is [3]
23.
Amira carries out a AQA-style required practical linked to energetics, kinetics and equilibria. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
24.
Amira carries out collecting valid data for energetics, kinetics and equilibria. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
25.
Amira carries out drawing a graph for energetics, kinetics and equilibria. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
26.
Amira carries out evaluating a method about energetics, kinetics and equilibria. This is a typical AQA required-practical style question.
(a) Identify the independent variable and the dependent variable. [2]
(b) State one control variable and explain why it must be controlled. [2]
(c) Suggest one improvement or source of error and how it affects the result. [2]
27.
Compare enthalpy change with Hess's law. [4]
28.
Compare Hess's law with mean bond enthalpy. [4]
29.
Compare mean bond enthalpy with collision theory. [4]
30.
Compare collision theory with rate equation. [4]
31.
Apply your knowledge of Le Chatelier to this situation: used with K to explain yield [3]
32.
Apply your knowledge of a Born–Haber cycle to this situation: formation, atomisation, ionisation, EA [3]