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 the following statements describe molecules that are structural isomers?

(i) molecules whose atoms have the same arrangement in space

(ii) molecules that have the same molecular formula

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

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

3 / 10

How many functional group isomers of C4H8 are there?

4 / 10

5 / 10

What is the electron configuration of a magnesium atom?

6 / 10

Using enthalpies of combustion ΔcH, calculate the enthalpy change for the hydrogenation of propene:

C3H6(g) + H2(g) => C3H8(g)

Select the data from theenthalpies of combustion ΔcH.

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

7 / 10

Sodium hydride reacts with water:

NaH(s) + H2O(l) -> NaOH(aq) + H2(g)

What is the concentration of a solution of sodium hydroxide formed when 0.600 g sodium hydride reacts with water and the solution is diluted to 100 cm3?

8 / 10

Which of these molecules are overall non-polar?

(i) H2O

(ii) CO2

(iii) SO2

(iv) CCl4

9 / 10

Which of these true statements can help to explain why magnesium has a higher melting point than sodium:

(i) magnesium atoms/ions are smaller than sodium atoms/ions

(ii) the metallic bonds are stronger in magnesium than in sodium

(iii) a magnesium atoms contributes two bonding electrons not one

(iv) the first ionisation energy is higher for magnesium than for sodium.

10 / 10

Which of these changes are redox reactions?

(i) NaCl(s) + H2SO4(l) -> HCl(g) + NaHSO4(s)

(ii) NH3(g) + HCl(g) -> NH4Cl(s)

(iii) CaCO3(s) -> CaO(s) + CO2(g)

(iv) 2HBr(g) + H2SO4 (l) -> Br2(l) + SO2(g) + 2H2O(l)

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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

Which of these changes are redox reactions?

(i) NaCl(s) + H2SO4(l) -> HCl(g) + NaHSO4(s)

(ii) NH3(g) + HCl(g) -> NH4Cl(s)

(iii) CaCO3(s) -> CaO(s) + CO2(g)

(iv) 2HBr(g) + H2SO4 (l) -> Br2(l) + SO2(g) + 2H2O(l)

2 / 10

In a titration, 25 cm3 of 0.100 mol dm-3 potassium hydroxide was neutralised by 12.5 cm3 dilute nitric acid. What was the concentration of the nitric acid?

3 / 10

Which one of the following is the electron configuration of a group 2 metal atom?

4 / 10

An ammonia molecule, NH3, can react to form an ammonium ion, NH4+. When this happens:

(i) the ammonia molecule forms a bond with a proton

(ii) the ion formed has a tetrahedral shape

(iii) a dative covalent bond forms

(iv) the H-N-H bond angle is 90o

5 / 10

Typically the molecular compounds of carbon with hydrogen:

(i) are insoluble in water

(ii) form solutions which do not conduct electricity

(iii) are soluble in liquid hydrocarbons

(iv) are denser than water

 

6 / 10

Which of these materials consist of a giant structure of ions?

(i) magnesium oxide

(ii) silicon dioxide

(iii) potassium fluoride

(iv) silicon chloride

7 / 10

8 / 10

9 / 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?

10 / 10

How many electrons are there in an oxide ion?

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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

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)

2 / 10

When iron(II) chloride solution mixes with silver nitrate solution some silver metal precipitates and the mixture reaches an equilibrium state.

Fe2+(aq) + Ag+(aq) <=> Fe3+(aq) + Ag(s)

When the aqueous layer is decanted off, the precipitate of silver redissolves on adding a solution of:

3 / 10

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

CH3COOH(l) + C2H5OH(l) => CH3COOCH2CH3(l) + H2O(l)

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

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

4 / 10

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

5 / 10

An example of an endothermic change is the:

6 / 10

A solution of Br2 and KI were mixed. Then shaken with cyclohexane. Which is correct?

(i) the bromine is reduced

(ii) the cyclohexane layer goes brown

(iii) the cyclohexane layer goes purple

(iv) the iodine is reduced

7 / 10

The reaction of calcium with water produces:

8 / 10

What is the oxidation number of MANGANESE in

MnO4-

9 / 10

What is the oxidation number of CARBON in

C2H6

10 / 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

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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

4 / 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

 

5 / 10

Infra-red absorption ranges for some bonds are as follows:

C-H, 2850 - 3300 cm-1

C=C, 1620 - 1680 cm-1

C=O, 1680 - 1750 cm-1

C-O, 1000 - 1300 cm-1

O-H (alcohols), 3230 - 3550 cm-1

O-H (acids), 2500 - 3000 cm-1

The IR spectrum of propanal has one particularly strong absorption peak

This can be expected to be at:

6 / 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

7 / 10

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

8 / 10

What is the mechanism for the reaction of bromine with prop-1-ene?

9 / 10

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

10 / 10

At a high temperature in the presence of steam, the alkane C16H24 reacts to form a mixture of ethene, propene and ethane. This is an example of:

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