Question 1

Consider the reaction: $2NO_2(g)$ ⇌ $N_2O_4(g)$
The imposed change at T1 is most likely to be:

Accepted Answer

an addition of $N_2O_4.$

Answer

an increase in the volume of the container.

Answer

a decrease in the volume of the container

Answer

an addition of $NO_2$

Question 2

Which of the following statements about acids and bases is FALSE?

Accepted Answer

All oxides are basic.

Answer

A hydrogen ion attached to water forms a hydronium ion.

Answer

Acids are able to produce hydrogen ions in solutions.

Answer

Bases are able to produce hydroxide ions in solution.

Question 3

The structural formula represents a compound. The IUPAC systematic name for this compound is:

Accepted Answer

2,4-dimethyl-1,3-hexadiene

Answer

3,5-dimethyl-3,5-hexane

Answer

2-ethyl-4-methyl-2,4-pentadiene

Answer

2-methyl-4-ethyl-1,3-pentadiene

Question 4

The equilibrium expression for the Ksp of $CaCO_3$ is:

Accepted Answer

$[Ca^{2+}][CO_3^{2–}]$

Answer

$[Ca^{2+}][CO_3^{2–}]/[CaCO_3]$

Answer

1/$[Ca^{2+}][CO_3^{2–}]$

Answer

$[CaCO_3]/[Ca^{2+}][CO_3^{2–}]$

Question 5

The pH of pure water at 50°C $(K_w$ = 5.5 × $10^{–14})$ is:

Accepted Answer

13.2

Answer

6.63

Answer

13.6

Answer

7

Question 6

Which of the following hydrocarbons have the molecular formula $C_5H_{10}O?$
(I) Pentanoic Acid
(II) Pentan-3-ol
(III) Pentanal
(IV) Pentan-3-one

Accepted Answer

I, III and IV

Answer

III and IV

Answer

I, II and III

Answer

IV only

Question 7

The purpose of the flame in the flame atomic absorption spectroscopy is to:

Accepted Answer

ionise the analyte atoms

Answer

purify the sample

Answer

excite the analyte atoms

Answer

desolvate and atomise the analyte atoms in a sample

Question 8

The equation describes an equilibrium reaction occurring in a closed system.
X(g) + Y(g) ⇌ 4Z(g); ∆H = +58 kJ
Under which set of conditions would the highest yield of Z(g) be obtained?

Accepted Answer

Temp: $50^0C$ ; Pressure: 200kPa

Answer

Temp: $300^0C$ ; Pressure: 200kPa

Answer

Temp: $50^0C$ ; Pressure: 100kPa

Answer

Temp: $300^0C$ ; Pressure: 100kPa

Question 9

Which of the following conductivity graphs represent the titration of acetic acid and ammonium hydroxide.

Accepted Answer

https://uploads.quizalize.com/ce2b13b9-7afe-474f-8c2e-665284e8add3/question/bd5b1e87c2607c6d3037ca4cff2dc5a424711ce4.JPG

Answer

https://uploads.quizalize.com/ce2b13b9-7afe-474f-8c2e-665284e8add3/question/c7a1f22a2b4e857951576614bdcc4478bf90f4dc.JPG

Answer

https://uploads.quizalize.com/ce2b13b9-7afe-474f-8c2e-665284e8add3/question/76f27c90ee9fc17c84b51b54521516d6f75d5b3e.JPG

Answer

https://uploads.quizalize.com/ce2b13b9-7afe-474f-8c2e-665284e8add3/question/c74f63765fed40ce489e7e6f9e817112402b797d.JPG

Question 10

The low boiling point of liquid hydrocarbons are often classified as being volatile. This means that:

Accepted Answer

they can ignite, even without an ignition source

Answer

they all give out the same amount of energy when combusted

Answer

they can easily change into a gas at normal temperature

Answer

their products of combustion are toxic

Question 11

Which of the following statements regarding mass spectroscopy is incorrect?

Accepted Answer

Only cations can be detected by a normal mass spectrometer

Answer

A compound whose molecules contain just one bromine atom shows two molecular peaks of
similar intensity, one at +1 and one and -1 of the average m/z value

Answer

In a normal mass spectrometer, electron impact causes a molecule to lose an electron an become
a molecular radical cation which decomposes into fragment cations and radicals

Answer

Molecular ion peaks always have an even-numbered values of mass charge ratio (m/z)

Question 12

The solubility product expression for tin (II) hydroxide is

Accepted Answer

$[Sn^{2+}][OH^-]^2$

Answer

$[Sn^{2+}]^2[OH^-]$

Answer

$[Sn^{2+}]^3[OH^-]$

Answer

$[Sn^{2+}][OH^-]$

Question 13

Choose the LEAST appropriate response.
A chemical industry such as the production of ammonia should be located:

Accepted Answer

where workers can easily access the site

Answer

in an urban area

Answer

close supplies to raw materials

Answer

close to transport facilities for removing the product

Question 14

A student uses their data table to find out that the heat of combustion of 1-propanol is 2021 kJ mol-1.
What value would the student calculate for the heat of combustion of 1-propanol in kJ g-1?

Accepted Answer

33.7

Answer

27.3

Answer

43.9

Answer

23.0

Question 15

A compound has the structure shown below: Hydrolysis of this compound will produce:

Accepted Answer

butan-2-ol and propanoic acid

Answer

propan-1-ol and butanoic acid

Answer

butan-1-ol and propanoic acid

Answer

propan-1-ol and 2-methylbutanoic acid

Question 16

What mass of acetic acid will produce 2.5 L of solution having a pH of 5.50?

Accepted Answer

1.9 x $10^{-4}g$

Answer

0.11 g

Answer

4.8 x $10^{-4}g$

Answer

8.3 x $10^{-5}g$

Question 17

Which of the following compounds is represented by X in the flow chart?

Accepted Answer

Ethanol

Answer

Glucose

Answer

Cellulose

Answer

Styrene

Question 18

A student determines the percentage of sodium chloride in a food sample by the following procedure. The food sample is dissolved in water and the chloride ion is precipitated by adding an excess of silver nitrate solution. The precipitate is washed and dried. If the food sample had a mass of 20.0 g and the final precipitate a mass of 0.376 g. What is the percentage of sodium chloride in the food?

Accepted Answer

1.88%

Answer

0.465%

Answer

0.767%

Answer

0.220%

Question 19

The concentration of reactants and products were studied for the following reactions:
$H_2(g)$ + $F_2(g)$ ⇌ 2HF(g); $K_{eq}$ = 313 at $25^oC$
In an experiment, the initial concentrations of the gases were
$[H_2]$ = 0.0120 M, $[F_2]$ = 0.0200 M, and [HF] = 0.500 M.
When the reaction reaches equilibrium at $25^oC,$ the concentration of HF will be:

Accepted Answer

0.25 M

Answer

less than 0.500 M

Answer

0.550 M

Answer

between 0.0500 M and 0.550 M

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