WorksheetsYear 12 Chemistry - Summary Quiz
Total questions: 40
Worksheet time: 2hrs 34mins
How many protons are there in 6.0 g of nitrogen gas?
(Avogadro constant, L = 6.022 × 1023 mol–1)
1.3 × 1023
9.0 × 1023
1.8 × 1024
3.6 × 1024
The diagram shows how a property of Period 3 elements varies across the period.
What is the property?
Atomic radius
Electronegativity
First ionisation energy
Melting point
Which statement about barium sulfate is correct?
It is soluble in water at a temperature of 100 °C.
It is used in medicine because it does not dissolve in body fluids.
It is a pale yellow solid.
It reacts with acidified barium chloride solution.
Which statement is correct about the reaction between concentrated sulfuric acid and solid sodium bromide?
Bromide ions are reduced.
Hydrogen bromide and sulfur are formed.
Sulfuric acid acts as an oxidising agent.
Bromine and hydrogen sulfide are formed.
Which element has the highest first ionisation energy?
Aluminium
Phosphorus
Silicon
Sulfur
A solution of volume 500 cm3 contains 150 g of ammonia.
What is the concentration, in mol dm–3, of ammonia in this solution? (Give answer to 3sf)
(a)
A student devised an experiment to find the concentration of sulfuric acid in a sample of battery acid.
• A measuring cylinder was used to transfer 10 cm3 of battery acid to a volumetric flask.
• Distilled water was added to the volumetric flask until the volume reached 250 cm3
• A 25.0 cm3 sample of diluted acid was transferred from the volumetric flask to a conical flask using a pipette.
• A few drops of methyl orange indicator were added to the acid in the conical flask before titrating the acid with sodium hydroxide.
• The titration was repeated five times but concordant results were not obtained.
(Note: Methyl orange is red in acid and yellow in alkali.)
Which suggestion would improve the chances of obtaining concordant titres?
Invert the volumetric flask several times after adding the distilled water.
Wash the pipette with distilled water between each titration.
Add extra drops of indicator to the sample when nearing the end point in each titration.
Use a more concentrated solution of sodium hydroxide in the burette.
A student has a 10 cm3 sample of 1.00 × 10–2 moldm–3 methanoic acid solution.
The student is asked to dilute the methanoic acid solution to a concentration of 2.00 × 10–4 moldm–3 by adding distilled water.
Which volume of water should be added?
200 cm3
490 cm3
500 cm3
510 cm3
Which molecule does not have a permanent dipole?
CH3Br
CH2Br2
CHBr3
CBr4
Which is the MAJOR product of the reaction between 2-methylbut-2-ene and iodine monochloride (ICl)?
A
B
C
D
Which statement is NOT correct about the industrial preparation of ethanol by the hydration of ethene at 300 °C?
C2H4(g) + H2O(g) ⇌ C2H5OH(g)
∆H = –46 kJ mol–1
The reaction is catalysed by an acid.
The higher the pressure, the higher the equilibrium yield of ethanol.
The higher the temperature, the higher the equilibrium yield of ethanol.
A low equilibrium yield of ethanol is acceptable because unreacted ethene is recycled.
Which compound has the highest boiling point?
butanal
butan-2-ol
but-2-ene
1-fluorobutane
Which statement is correct about the fractional distillation of crude oil?
A zeolite catalyst is used.
Each fraction contains a mixture of hydrocarbons.
Gaseous fractions are formed by breaking covalent bonds.
The fractionating column is hottest at the top.
How many structural isomers with an unbranched carbon chain have the molecular formula C4H8Br2?
(a)
The Maxwell–Boltzmann distribution of molecular energies in a sample of gas at a fixed temperature is shown.Which letter represents the mean energy of the molecules?
(a)
Ethanol can be made from glucose by fermentation.
C6H12O6 → 2C2H5OH + 2CO2
In an experiment, 268 g of ethanol (Mr = 46.0) were made from 1.44 kg of glucose (Mr = 180.0).
What is the percentage yield? Give your answer to 1 d.p
(a)
Which species could act as a nucleophile?
BH3
NH4+
PH3
SiH4
Which statement is correct about poly(chloroethene)?
It has the empirical formula CHCl
It decolourises bromine water.
Its brittleness is reduced by plasticisers.
Its polymer chain contains alternate single and double bonds.
What is the enthalpy of formation of buta-1,3-diene, C4H6(g)?
Give your answer in kJ mol-1 and to 3sf, making sure to give the sign (+ or -) in front of the number.
(a)
Compound A is a halogenoalkane. Name Compound A.
HINT - take care to put the commas and hyphens in the right places.
(a)
Nonane can be cracked to form large quantities of propene.
Name the type of cracking used.
(a)
Complete the equation for the complete combustion of nonane.
C9H20 + (a) O2 → 9CO2 + 10H2O
Complete the electron configuration for Fe2+.
1s22s22p63s2 (a)
(Do not worry about numbers not being superscript)
A sample of nickel was analysed in a time of flight (TOF) mass spectrometer. The sample was ionised by electron impact ionisation. The spectrum produced showed three peaks with abundances as set out in the table.
Calculate the relative atomic mass of the nickel in the sample.
Give your answer to one decimal place.
(a)
Copper can be produced by the reaction of carbon with copper(II) oxide according to the equation
2CuO + C ⟶ 2Cu + CO2
Calculate the percentage atom economy for the production of copper by this process.
Give your answer to 3sf.
(a)
Which statement about time of flight mass spectrometry is correct?
The current in the detector is proportional to the ion abundance
Sample particles gain electrons to form positive ions
Particles are detected in the order of their kinetic energies
Ions are accelerated by a magnetic field
A 4.85 g sample of anhydrous sodium sulfate is dissolved in water and the solution made up to 250 cm3 in a volumetric flask.
What is the concentration in mol dm−3 of sodium sulfate in the solution?
0.0341
0.137
0.163
0.273
Which species has one or more bond angle(s) of 90°?
CH4
NH4+
ClF4−
AlCl4−
The forward reaction in this equilibrium is endothermic
COCl2 (g) ⇌ CO(g) + Cl2 (g)
Which statement is correct?
If the total pressure is increased at constant temperature, the proportion of COCl2 in the equilibrium mixture will decrease
Use of a catalyst will increase the proportion of COCl2 in the equilibrium mixture at constant temperature and pressure
Reducing the equilibrium concentration of CO will increase the value of the equilibrium constant
Raising the temperature from 373 K to 473 K will increase the value of the equilibrium constant
Which of these is not a redox reaction?
Cu2O + H2SO4 ⟶ CuSO4 + Cu + H2O
MgO + 2HCl ⟶ MgCl2 + H2O
SnCl2 + HgCl2 ⟶ Hg + SnCl4
MnO2 + 4HCl ⟶ MnCl2 + 2H2O + Cl2
What is the empirical formula of an oxide of nitrogen that contains 26% nitrogen by mass?
(a)
Which species is NOT produced by a redox reaction between solid sodium iodide and concentrated sulfuric acid?
Na2SO4
H2S
S
SO2
2-Methylpropan-1-ol can be prepared by reacting 1-bromo-2-methylpropane with dilute aqueous sodium hydroxide.
Name the mechanism for this reaction.
(a)
This structure shows a molecule that has been used as a plasticiser in PVC.
Deduce the number of hydrogen atoms in this molecule.
(a)
Hydrogen can be produced by this reaction.
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)
In an experiment 4.20 mol of carbon monoxide were mixed with 2.00 mol of steam. When the reaction reached equilibrium, 1.60 mol of hydrogen had been formed.
What is the value of the equilibrium constant, Kc, for this reaction?
0.30
0.41
1.54
2.46
Two sealed flasks with the same volume are left side by side.
Flask A contains 4.0 × 10−3 mol of methane. Flask B contains 340 mg of a different gas.
Both gases are at the same temperature and pressure. Which gas could be in Flask B?
CH2Cl2
HBr
Kr
PF3
Which one of the following statements about but-2-enal, CH3CH=CHCHO, is not true?
It has stereoisomers.
It shows a strong absorption in the infra-red at about 1700cm−1.
It will turn an acidified solution of potassium dichromate(VI) green.
It can be dehydrated by concentrated sulphuric acid.
The infrared spectrum of an organic compound is shown.
Which compound produces this spectrum?
butanone
ethanol
pent-2-ene
propanoic acid
Which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
CHCl3 + Cl2 ⟶ CCl4 + HCl
●CCl3 + ●Cl ⟶ CCl4
CHCl3 + ●Cl ⟶ CCl4 + ●H
●CCl3 + Cl2 ⟶ CCl4 + ●Cl
Which compound is a structural isomer of Z-but-2-ene?
butane
E-but-2-ene
cyclobutane
methylbut-2-ene
