Chemistry Random Retrieval Y13

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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

What is the repeat unit in the polymer formed from propene?

2 / 10

Which of these polymers would you expect to have the strongest intermolecular (interchain) forces as a result of the presence of polar covalent bonds?

3 / 10

Step 6:

4 / 10

Step 2:

5 / 10

Which statement helps to explain why propene react with hydrogen bromide to form mainly 2-bromopropane and much less 1-bromopropane?

6 / 10

Consider the following equilibrium:

2SO2(g) + O2(g) <=>2SO3(g)

35.0 mol of 2SO2 was mixed with 22.5 mol of O2 and the mixture sealed in a heated vessel with vanadium (V) oxide catalyst. The mixture was left until no further observable change in composition took place. At this point, 15.0 mol of O2 was present in the mixture.

Calculate the value of the mole fraction of SO3 present in the mixture under these conditions

7 / 10

Which of these compounds give an alkaline solution when mixed with water?

(i) NH4Cl

(ii) NH3

(iii) CH3CH2OH

(iv) CH3CO2Na

8 / 10

For which of these compounds would expect the best agreement between the values of the lattice energy derived from experimental data (with the help of the Born-Haber cycle) and the values calculated from theory on the assumption that the bonding in the crystals is purely ionic?

9 / 10

What enthalpy change is represented by the following equation?

Cl(g) + e-=> Cl-(g)

10 / 10

Using your half-equations from questions 1 & 2, balance the REDOX equation below.

O2 + H+ + Br- => Br2 + H2O

Select the integers that represent the ratio of species in the overall balanced REDOX equation.

If this question appears in a Random Retrieval quiz, you would be best constructing separate half-equations for the species that is oxidised and the species that is reduced prior to working out the overall REDOX equation.

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7

Physical Chemistry & Transition Elements Random Retrieval

This quiz contains all the questions in the Physical Chemistry & Transition Elements section. The website will pick 10 questions at random.

1 / 10

What is the value of Eϴcell/V observed for a cell constructed from the following half-cells?

Zn2+(aq) + 2e- <=> Zn(s) Eϴcell/V = -0.76

Cu2+(aq) + 2e- <=> Cu(s) Eϴcell/V = +0.34

2 / 10

Work out the ratio of the species in the following half-equation.

S2O32- => S4O62- + e-

3 / 10

Which first-row d-block element has the electron configuration

1s22s22p63s23p64s13d5?

4 / 10

What enthalpy change is represented by the following equation?

Ca(s) => Ca(g)

5 / 10

Consider the following equilibrium:

N2(g) + O2(g) <=>2NO(g)

5.00 x 10-3 mol of N2 was mixed with 4.00 x 10-3 mol of O2 and 11.0 x 10-3 mol of NO and the mixture sealed in a container. The volume of the container was 0.500 dm3. The mixture was left to form a stable equilibrium. At this point, 9.00 x 10-3 mol of NO was present in the mixture. The pressure was recorded as 45000 kpa

Calculate the value of Kp (no units) under these conditions.

6 / 10

Kp = 4 atm for the dissociation of N2O4 at 350 K when the equilibrium is described by this equation.

N2O4(g) <=> 2NO2(g)

What is the value of Kp for this equilibrium:

2NO2(g) <=> N2O4(g)?

7 / 10

Consider the following equilibrium:

2SO2(g) + O2(g) <=>2SO3(g)

35.0 mol of 2SO2 was mixed with 22.5 mol of O2 and the mixture sealed in a heated vessel with vanadium (V) oxide catalyst. The mixture was left until no further observable change in composition took place. At this point, 15.0 mol of O2 was present in the mixture.

Calculate the value of the mole fraction of SO3 present in the mixture under these conditions

8 / 10

What are the units of k for this reaction?

9 / 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?

10 / 10

What does the symbol [X] represent?

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11

Organic Chemistry & Analysis Random Retrieval

This quiz contains all the questions in the Organic Chemistry & Analysis section. The website will pick 10 questions at random.

1 / 10

This is the 1H NMR spectrum of:

2 / 10

This is the 1H NMR spectrum of:

3 / 10

How many peaks would you expect to see in the 13C spectrym of 3-propyl aminobenzene?

 

4 / 10

Which of these compounds are functional group isomers of

HCO2CH2CH2CH3?

(i) ethyl ethanoate,

(ii) 2-methylpropanoic acid,

(iii) methyl propanoate,

(iv) butanoic acid

5 / 10

Which of these characteristics of polymers accounts for the difference between low density and high density poly(ethene)?

[1] the average length of the polymer chains

[2] the type of intermolecular (interchain) forces

[3] the number and size of bulky side groups

[4] the extent of chain branching

6 / 10

Which monomer polymerises to form this polymer?

---CH2CHCl-CH2CHCl-CH2CHCl-CH2CHCl---

7 / 10

Which is the most typical reaction of an amine in organic synthesis?

8 / 10

The reaction using a mixture of benzene and ethene in the presence of hydrogen chloride and aluminium chloride produces an important intermediate in the manufacture of:

9 / 10

Ethyl ethanoate is heated under reflux with excess aqueous sodium hydroxide. The resulting solution is distilled. The distillate contains:

10 / 10

Which of these aldehydes are isomers of pentan-2-one?

(i) pentanal

(ii) 2-methylbutanal

(iii) 3-methylbutanal

(iv) 2,2-dimethylbutanal

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