Period Table & Energy Random Retrieval

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Period Table & Energy Random Retrieval

This quiz contains all the questions in the Period Table & Energy section. The website will pick 10 questions at random.

1 / 10

Which of these reactions can be reversed by changing the conditions in a typical advanced chemistry laboratory?

(i) CuSO4.5H2O(s) -> CuSO4(s) + 5H2O(l)

(ii) 2Mg(s) + O2(g) -> 2MgO(s)

(iii) NH3(g) + HCl(g) -> NH4Cl(s)

(iv) CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l)

2 / 10

Chlorine disproportionates when it reacts with:

3 / 10

Which of the following increase from left to right along the series Mg - Ca - Sr - Ba?

(i) the thermal stability of the nitrates

(ii) the thermal stability of the carbonates

(iii) the solubility of the hydroxides in water

(iv) the solubility of the sulfates in water

 

4 / 10

What is the oxidation number of CARBON in methanol

CH3OH

5 / 10

What is the oxidation number of NITROGEN in

NH4+

6 / 10

What is the oxidation number of BROMINE in

BrO-

7 / 10

What is the oxidation number of CARBON in

C2H6

8 / 10

What is the oxidation number of NITROGEN in

NH3

9 / 10

Across period 2 from lithium to neon, the first ionisation enthalpy (energy) of:

(i) oxygen is higher than that of neon

(ii) oxygen is higher than that of nitrogen

(iii) boron is higher than that of beryllium

(iv) beryllium is higher than that of lithium

10 / 10

In which of these pairs do both entities have the same electron configuration?

(i) Li and Na

(ii) Na+ and Mg2+

(iii) F- and Cl-

(iv) Cl- and Ar

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