6. A student doing a titration found out that 12.5cm3 of aqueous KOH with a concentration of 0.0200 exactly neutralised 25.0cm3 of nitric acid. What is the concentration of the nitric acid? (concentration units have been excluded to avoid giving away answer
9.965
0.0100
1.23 times 10 to the power of 5
1.1000
123.7
7. Electrons can be found in orbits.
False
True
8. Ammonium nitrate( NH4NO3) is used as a fertiliser. How much nitrogen does it contain by mass?
80%
45%
6%
35%
28%
9. How many products can produced from a reaction of an acid and a carbonate?
3
4
5
1
2
10. How many atoms are in 1.25 mol of oxygen gas?
6
8.9 times ten to the power of 88
1.51 times 10 to the power of 24
3.33 times 10 to the power of 66
4.5 times ten to the power of 21
11. What colour and state is anhydrous copper(II) sulphate?
white powder
blue crystals
brown crystals
pink gas
yellow liquid
12. Which experiment is used to measure the oxidation number of a molecule?
none
titration
mass spectrometer
electron micrograph
redox
13. What is the oxidation number of oxygen bonded in peroxides?
+1
-1
-2
+2
14. What happens to the first ionisation energy down a group?
oscillates
increases
deceases
stays the same
15. Oxidation and reduction involves only oxygen?
False
True
16. How many f orbitals are there?
9
1
7
5
3
17. The first ionisation energy of O is greater than the ionisation energy of N?
False
True
18. What do successive ionisation energies provide evidence for?
orbits
orbitals
nuclei
shells
sub shells
19. How many electrons does the seventh shell have?
18
7
98
81
2
20. What is the electron configuration of O2-? (Not using short hand)
