Chemistry Year 13 Random Retrieval

This quiz contains all the questions in the year 13 chemistry section. The website will pick 10 questions at random.

1 / 10

The reagent which converts ethanoic acid to ethanoyl chloride is:

Cl₂

SOCl₂

NaCl

NaOCl

2 / 10

Examples of polymers that contain the amide bond include:

(i) sugars

(ii) DNA

(iii) Terylene^TM(PET)

(iv) proteins

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which of these amino acids are chiral?

(i) CH₃CHNH₂CO₂H

(ii) C₆H₅CH₂CHNH₂CO₂H

(iii) HOCH₂CHNH₂CO₂H

(iv) CH₂NH₂CO₂H

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

Step 6:

relux with dilute hydrochloric acid

heat with acidified K₂Cr₂O₇ with distillation of product

reflux with concentrated phosphoric acid and distil

relux with dilute potassium hydroxide

5 / 10

Which of these are examples of kinetic stability?

(i) A solution of hydrogen peroxide can be stored at room temperature

(ii) Hydrogen does not ignite in air at room temperature

(iii) Aluminium does not corrode in moist air

(iv) Magnesium oxide does not decompose on heating

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

What does the symbol [X] represent?

the mass of X in g

the amount of X in moles

the concentration of X in g dm^-3

the concentration of X in mol dm^-3

7 / 10

Nitrogen monoxide gas reacts with oxygen gas to form nitrogen dioxide gas. If the rate of formation of nitrogen dioxide is 1.4 x 10^-5 mol dm^-3, what is the rate of disappearance of oxygen?

0.7 x 10^-5 mol dm^-3

1.4 x 10^-5 mol dm^-3

2.1 x 10^-5 mol dm^-3

2.8 x 10^-5 mol dm^-3

8 / 10

Which of these are examples of acid-base reactions according to the Bronsted-Lowry theory.

(i) ZnO_(s)+2H₃O⁺_(aq)->Zn²⁺_(aq)+3H₂O_(l)

(ii) H₂O_(l)+H₂O_(l)->H₃O⁺ _(aq)+ OH^-_(aq)

(iii) NH₃_(g)+HBr_(g)->NH₄Br _(s)

(iv) SO₂_(g)+H₂O_(l)->H₂SO₃_(aq)

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

9 / 10

These are four values for the hydration enthalpies of ions:

-361 kJ mol^-1, -559 kJ mol^-1, -2003 kJ mol^-1, -2537 kJ mol^-1.

These ions from left to right are:

K⁺, Li⁺, Mg²⁺, Al³⁺

Li⁺, K⁺, Mg²⁺, Al³⁺

Al³⁺, Mg²⁺, Li⁺, K⁺

Al³⁺, Mg²⁺, K⁺, Li⁺

10 / 10

The lattice enthalpy for magnesium oxide is -3850 kJ mol^-1.

The energy needed to break up 0.1 mol MgO into gaseous ions at 298K is:

[1] -38.5 kJ mol-1

[2] -385 kJ mol^-1

[3] +385 kJ mol^-1

[4] +3850 kJ mol^-1

38.5 kJ mol-1

-385 kJ mol^-1

+385 kJ mol^-1

+3850 kJ mol^-1

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