Chemistry Year 12 Random Retrieval

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Chemistry Year 12 Random Retrieval

This quiz contains all the questions in the year 12 chemistry section. The website will pick 10 questions at random.

1 / 10

Why is ethanol a liquid while propane is a gas? (Relative atomic masses: C = 12, H = 1, O = 16)

2 / 10

This procedure produces a white precipitate which dissolves easily in dilute ammonia solution: heating C4H9X for a few minutes with aqueous alkali, then acidifying the mixture with dilute nitric acid and adding silver nitrate. This shows that X is:

3 / 10

The peak with the largest mass to charge ratio in the mass spectrum of an alkane is detected at mass-to-charge ratio = 58.

This shows that the hydrocarbon:

4 / 10

Which of these comparative statements are true?

(i) a calcium atom is larger than a calcium ion

(ii) a calcium atom has a larger radius than a magnesium atom

(iii) calcium has a smaller first ionisation energy than magnesium

(iv) a calcium ion is smaller than a magnesium ion

5 / 10

Hydrazine burns according to this equation: N2H4(g) + O2(g) -> N2(g) + 2H2O(l)

Calculate the standard enthalpy change for the combustion of hydrazine given that the standard enthalpy of formation of hydrazine is +51 kJmol-1 and of water is -286 kJ mol-1

6 / 10

What is the electron configuration of an oxide ion?

7 / 10

An element X has the electron configuration 1s22s22p2. Element Y has the electron configuration 1s22s22p5. What is the likely formula of the compound of X and Y?

8 / 10

Which of these molecules are overall polar?

(i) CH3Cl

(ii) CH2Cl2

(iii) CHCl3

(iv) CCl4

9 / 10

What is the bond angle found in methane?

10 / 10

The oxidation number of sulfur in sulfuric acid, H2SO4, is:

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