Chemistry Random Retrieval Y12

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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

The members of the homologous series of alkanes:

(i) are all straight-chain compounds

(ii) have the general formula CnH(2n + 2)

(iii) have identical chemical properties

(iv) show a regular gradation of physical properties as the number of carbon atoms increases.

2 / 10

Which of these organic compounds show a broad absorption peak caused by hydrogen bonding affecting a functional group.

(i) propanol

(ii) propanal

(iii) propanoic acid

(iv) propanone

3 / 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

4 / 10

What is the oxidation number of NITROGEN in

NH3

5 / 10

The carbonates of group 2 metals (M):

(i) have the formula of the form MCO3

(ii) are insoluble in water

(iii) become more difficult to decompose on heating down the group

(iv) decompose on heating to the metal and carbon dioxide

6 / 10

An example of an endothermic change is the:

7 / 10

The value that you obtain for the enthalpy of combustion ΔcH of liquid ethanol using mean bond enthalpies is different from the value obtained experimentally, or by using enthalpy of formation ΔfH of liquid ethanol.

What is the most significant reason for this?

8 / 10

Which of these systems is NOT in a state of dynamic equilibrium?

9 / 10

Steel and graphite are similar in that they both.

(i) conduct electricity

(ii) are dark grey/black when powdered

(iii) can have high tensile strength

(iv) are brittle

10 / 10

What volume of 0.10 mol dm-3 hydrochloric acid is needed to neutralise 20.0 cm3 of 0.05 mol dm-3 barium hydroxide?

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19

Foundations in Chemistry Random Retrieval

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

1 / 10

What is the temperature of a 12dm3 sample of gas that contains 7g of nitrogen if it is held at a pressure of 300kPa pressure given that the value of the gas constant R = 8.314 J mol-1K-1?:

2 / 10

Which of these gases behaves very much like an ideal gas at room temperature and pressure?

(i) helium

(ii) oxygen

(iii) hydrogen

(iv) butane

3 / 10

Which of these elements has a relatively low boiling point (below 500 oC)?

4 / 10

In the family of hydrocarbons called alkanes:

(i) the boiling points of the straight chain compounds rise as the number of carbon atoms increases

(ii) the intermolecular forces arise from attractions between temporary dipoles

(iii) in any pair of isomers the compound with the more highly branched molecules has the lower boiling point

(iv) the unbranched compounds are all liquids at room temperature.

5 / 10

What is/are the bond angle(s) found in iodine trifluoride?

(i) 104.5o

(ii) 120o

(iii) 107o

(iv) 90o

6 / 10

Using the basic rules of VSEPR, what would you expect the bond angle to be in H2S?

7 / 10

A chloride ion and an argon atom have the same:

(i) number of protons

(ii) number of electrons

(iii) atomic number

(iv) electron configuration

8 / 10

During the electrolysis of molten sodium chloride:

(i) sodium metal forms at the negative electrode

(ii) sodium ions are reduced at the cathode

(iii) chloride ions lose electrons at the positive electrode

(iv) chlorine atoms are given off as a gas at the anode

9 / 10

Which of these sets of properties is that of an ionic compound?

10 / 10

Analysis of a sample of potassium in a mass spectrometer shows that it consists of 93.2% potassium 39 and 6.8% potassium-41. What is the relative atomic mass of potassium?

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8

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

This is the equilibrium in a solution of bromine in water:

Br2(aq) + H2O(l) <=> HOBr(aq) + H+(aq) + Br-(aq)

The orange colour of bromine disappears on adding

(i) sodium bromide

(ii) water

(iii) dilute hydrochloric acid

(iv) sodium hydroxide solution

2 / 10

For which of these equilibria does a change in pressure have no effect on the yield of substances on the right-hand side of the equation?

(i) CH4(g) + H2O(g) <=> 3H2(g) + CO(g)

(ii) 2HI(g) <=> H2(g) + I2(g)

(iii) 2SO2(g) + O2(g) <=> 2SO3(g)

(iv) H2O(g) + CO(g) <=> H2(g) + CO2(g)

3 / 10

The enthalpy of combustion ΔcH of butan-1-ol = -2670 kJ mol-1

Using this figure and data from the 'Selection of Enthalpies of Formation and Combustion' shown above, calculate the enthalpy of formation ΔfH of liquid butan-1-ol

A Hess Cycle should be drawn to help you calculate this.

If this question was generated from Random Retrieval, this data can also be found in TOOLS>Data Sheets.

4 / 10

Using enthalpies of formation ΔfH, calculate the enthalpy change for the following reaction.

CaCO3(s) => CaO(s) + CO2(g)

Select the data from the 'Selection of Enthalpies of Formation and Combustion'.

If this question was generated from Random Retrieval, this data can also be found in TOOLS>Data Sheets.

5 / 10

The standard enthalpy change of formation of N2O(g) is +82 kJ mol-1. This shows that

6 / 10

Bubbling carbon dioxide into an aqueous solution of calcium hydroxide produces a white precipitate of:

7 / 10

What is the electron configuration of a magnesium atom?

8 / 10

What is the oxidation number of CHROMIUM in

Cr2O72-

9 / 10

What is the oxidation number of CARBON in

CH4

10 / 10

Which of these true statements help to explain why the values of the first ionisation enthalpies (energies) of the group 1 metals fall down the group from lithium to caesium?

(i) Down the group, the outer electron gets further from the nucleus

(ii) The charge on the nucleus increases down the group

(iii) Greater shielding means that the attraction between the nucleus and the outer electron reduces down the group

(iv) In all the atoms the outer electron is an s-electron

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20

Core Organic Chemistry Random Retrieval

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

1 / 10


Choose one of the following options:

2 / 10

3 / 10

Which of the following statements describe molecules that are stereo isomers?

(i) molecules whose atoms have a different arrangement in space

(ii) molecules that have the same molecular formula

(iii) molecules in which the atoms are joined to the same neighouring atoms

(iv) molecules which the same atoms but the atoms are bonded in a different order

 

4 / 10

Which of these pairs of compounds react to form 2-bromopropane as one of the products?

(i) prop-1-ene and hydrogen bromide at room temperature

(ii) propane and bromine in ultraviolet light

(iii) propan-2-ol on heating with sodium bromide

(iv) propan-1-ol and hydrogen bromide on heating

5 / 10

What is the formula of 2-bromo-3-methylpentane?

6 / 10

Which of these alcohols are isomers of butan-1-ol?

(i) CH3CH2CHOHCH3

(ii) (CH3)3COH

(iii) CH3CH(CH3)CH2OH

(iv) (CH3)3CCH2OH

7 / 10

What is made by heating propan-1-ol under reflux with excess of a hot acidic solution of potassium dichromate(VI) and then distilling off the product?

8 / 10

What is the H-C-H bond angle in ethene?

9 / 10

The members of the homologous series of alkanes:

(i) are all straight-chain compounds

(ii) have the general formula CnH(2n + 2)

(iii) have identical chemical properties

(iv) show a regular gradation of physical properties as the number of carbon atoms increases.

10 / 10

An alkane in petrol is:

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