C2.3 - Analytical chemistry Knowledge Test

Candidate Name:
1) What is a pure substance?
2) What is a formulation?
3) What can be used to distinguish between pure substances and mixtures?
4) What are examples of formulations?
5) What is a pure substance in everyday language?
6) How are formulations made?
7) How would you test if carbon dioxide was present In a reaction?
8) How would you test if Hydrogen was present In a reaction?
9) How would you test if chlorine was present In a reaction?
10) How would you test if Oxygen was present In a reaction?
11) What can Chromatography be used to separate?
12) What are the names of the two phases involved in chromatography?
13) What does seperation depend on?
14) How should the Rf value be expressed?
15) How is the Rf value calculated?
16) How do the Rf values of compounds change in different solvents?
17) How can compounds be identified?
18) How many spots are produced by a pure compound compared to a compound in a mixture?
19) How can paper chromatography be used to separate mixtures?
20) How can chromatographic methods can be used for distinguishing pure substances from impure substances?
21) How can chromatograms be used to determine R values?
22) How can elements and compounds be detected?
23) What are the advantages of instrumental methods compared with the chemical tests?
24) What are the different colours produced by some metal ions (cations)?
25) When are some flame colours masked?
26) How do carbonates react with dilute acids?
27) What do Halide ions produce when they react with silver nitrate solution?
28) What do Sulfate ions in solution produce when they react with barium chloride in the presence of hydrochloric acid?
29) What solution can be used to identify some some metal ions (cations)?
30) What do solutions of aluminium, calcium and magnesium ions form?
31) What happens when sodium hydroxide is added to Solutions of copper(II), iron(II) and iron(III) ions?
32) Write a balanced equation for reactions that produce the insoluble hydroxides.
33) What is Flame emission spectroscopy used for?
34) What can the output of a line spectrum be used for?
35) How do the Big Ideas link to this topic?

a) Forces:

b) Particles:

c) Energy:

d) Cells: