WorksheetsCambridge IGCSE Chemistry Quiz
Total questions: 40
Worksheet time: 20mins
An experiment is set up as shown. cotton wool soaked in ammonia cotton wool soaked in hydrochloric acid After several minutes, a white ring of ammonium chloride appears as shown. ammonium chloride Which statement explains the observation after several minutes?
Ammonia gas diffuses faster than hydrogen chloride gas because its molecules have a lower molecular mass.
Ammonia gas diffuses faster than hydrogen chloride gas because its molecules have a higher molecular mass.
Ammonia gas diffuses slower than hydrogen chloride gas because its molecules have a lower molecular mass.
Ammonia gas diffuses slower than hydrogen chloride gas because its molecules have a higher molecular mass.
A student put exactly 25.00 cm3 of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use?
balance, measuring cylinder, thermometer
balance, pipette, stopwatch
balance, pipette, thermometer
burette, pipette, thermometer
A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass. What is the filtrate?
broken glass only
broken glass and sugar solution
pure water
sugar solution
How many protons, neutrons and electrons are there in one atom of the isotope 27 13 Al?
13 13 13
13 14 13
14 13 13
14 14 13
Which description of brass is correct?
alloy
compound
element
non-metal
Some properties of diamond are shown. 1 It is very hard. 2 Every atom forms four bonds. 3 It does not conduct electricity. Which properties are also shown by silicon(IV) oxide?
1 only
1 and 2
1 and 3
2 and 3
Which statement describes the attractive forces between molecules?
They are strong covalent bonds which hold molecules together.
They are strong ionic bonds which hold molecules together.
They are weak forces formed between covalently-bonded molecules.
They are weak forces which hold ions together in a lattice.
Which substance is described as a macromolecule?
ammonia
graphite
iron
sodium chloride
The equation for the reaction of sodium with water is shown. 2Na + 2H2O → 2NaOH + H2 What is the volume of hydrogen gas, measured at r.t.p., produced when 18.4 g of sodium reacts with excess water?
9.6 dm3
15.0 dm3
19.2 dm3
30.0 dm3
Iron can be electroplated with zinc to make it resistant to corrosion. Which row about electroplating iron with zinc is correct?
iron zinc iron nitrate
iron zinc zinc nitrate
zinc iron iron nitrate
zinc iron zinc nitrate
Chlorine reacts with ethane to produce chloroethane and hydrogen chloride. The reaction is exothermic. The bond energies are shown in the table. bond bond energy in kJ / mol C–Cl +340 C–C +350 C–H +410 Cl –Cl +240 H–Cl +430 What is the energy change for the reaction?
–1420 kJ / mol
–120 kJ / mol
+120 kJ / mol
+1420 kJ / mol
Chlorine gas is bubbled into aqueous potassium iodide. What is the ionic equation for the reaction that takes place?
Cl + I– → Cl– + I
Cl2 + 2I– → Cl2– + I2
Cl2 + 2I– → 2Cl– + I2
Cl2 + 2I– → 2Cl– + 2I
Concentrated aqueous sodium chloride is electrolysed. Which equation represents the reaction at the cathode?
Na+ + e– → Na
2O2– → O2 + 4e–
2H+ + 2e– → H2
2Cl– → Cl2 + 2e–
Which statements about hydrogen are correct? 1 When hydrogen is burned, heat energy is released. 2 When hydrogen is used in a fuel cell, electrical energy is generated. 3 When hydrogen is used as a fuel, water is the only product.
1, 2 and 3
1 and 2 only
1 only
3 only
Solid X is heated strongly. The colour of the solid changes from blue to white. What is solid X?
anhydrous cobalt(II) chloride
calcium carbonate
hydrated copper(II) sulfate
lead(II) bromide
Iron(II) chloride solution reacts with chlorine gas. The equation is shown. 2FeCl2(aq) + Cl2(g) → 2FeCl3(aq) Which statements about this reaction are correct? 1 Fe2+ ions are reduced to Fe3+ ions. 2 Chlorine acts as a reducing agent. 3 Fe2+ ions each lose an electron. 4 Cl2 molecules are reduced to Cl– ions.
1 and 2
2 and 3
2 and 4
3 and 4
Which statements about acids and bases are correct? 1 An acid reacts with a metal to give off hydrogen. 2 A base reacts with an ammonium salt to give off ammonia. 3 An acid reacts with a carbonate to give off carbon dioxide. 4 Alkaline solutions are orange in methyl orange.
1, 2 and 3
1, 2 and 4
1, 3 and 4
2, 3 and 4
Oxide 1 is a solid that reacts with dilute hydrochloric acid. Oxide 2 is a gas that reacts with sodium hydroxide solution. What are the formulae of the oxides?
CaO MgO
MgO NO2
NO2 SO2
SO2 CaO
Which reaction is a photochemical reaction?
addition of bromine to propene
esterification of ethanol and ethanoic acid
oxidation of ethanol
substitution of methane with chlorine
The equation shown represents a reaction at equilibrium. m and n represent the balancing numbers for the reactant and product respectively. mP(g) nQ(g) A high temperature increases the concentration of Q. A high pressure increases the concentration of Q. Which statement about the reaction is correct?
The forward reaction is exothermic and m is greater than n.
The forward reaction is exothermic and m is less than n.
The forward reaction is endothermic and m is greater than n.
The forward reaction is endothermic and m is less than n.
A period of the Periodic Table is shown. group I II III IV V VI VII VIII element R S T V W X Y Z The letters are not their chemical symbols. Which statement is correct?
Element R does not conduct electricity.
Elements R and Y react together to form an ionic compound.
Element Z exists as a diatomic molecule.
Element Z reacts with element T.
All metal nitrates are soluble in water. All metal chlorides are soluble except silver and lead. All metal carbonates are insoluble except sodium and potassium. Which aqueous solutions produce a precipitate when mixed together? 1 silver nitrate + sodium carbonate 2 silver nitrate + sodium chloride 3 barium nitrate + potassium chloride
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
Which row describes properties of transition elements?
coloured compounds high density variable oxidation states
high density high
Which row describes properties of transition elements?
coloured compounds high density variable oxidation states
high density high melting point one oxidation state
high melting point coloured compounds one oxidation state
low melting point high density variable oxidation states
Which statement explains why noble gases are unreactive?
They all have eight electrons in their outer shells.
They all have full outer shells.
They are all gases.
They are all monoatomic.
Which statement is correct for all metals?
They conduct electricity when molten.
They gain electrons when they form ions.
They have a low density.
They have a low melting point.
Which statement describes how carbon dioxide is made during the extraction of aluminium from bauxite?
Carbon monoxide reduces aluminium oxide forming carbon dioxide and aluminium.
Carbon is burned in the blast furnace to release heat energy.
Oxygen made in the process reacts with the carbon electrode.
The ore of aluminium undergoes thermal decomposition.
Which statement explains why aluminium resists corrosion?
Aluminium does not form ions easily.
Aluminium does not react with water or air.
Aluminium has a protective oxide layer.
Aluminium is below iron in the reactivity series.
Which statements explain why zinc is used to protect iron from rusting?
Zinc is more reactive than iron.
Zinc is less reactive than iron.
Zinc can form alloys with iron.
Zinc acts as a sacrificial metal.
Which conditions are used in the Haber process?
100 °C, 10 atmospheres
450 °C, 10 atmospheres
450 °C, 200 atmospheres
1000 °C, 500 atmospheres
Which process does not produce a greenhouse gas?
acid rain on limestone buildings
combustion of wood
digestion in cows
zinc reacting with sulfuric acid
Which reaction involving sulfur dioxide is correct?
It is produced during the extraction of zinc from zinc blende.
It reacts with concentrated sulfuric acid to form oleum.
It reacts with sulfur to form sulfur trioxide.
It turns an acidified solution of potassium manganate(VII) purple.
Which substance is removed by lime in the treatment of waste water?
ammonia
sodium chloride
sodium hydroxide
sulfuric acid
What is the structure of the ester formed from ethanoic acid and propanol?
Structure A
Structure B
Structure C
Structure D
What could fuels X and Y be if they produce carbon dioxide and water when burned in air?
C2H6, C8H18
C3H8, C2H6
CH4, C8H18
CH4, C2H6
How many different homologous series are represented by the four organic molecules shown?
1
2
3
4
Which statement about ethene is correct?
It has the chemical formula C2H6.
It burns in excess oxygen producing carbon dioxide and water.
It reacts with Br2 to produce an orange solution.
It reacts with oxygen to form ethanol.
Which row states an advantage of each method of ethanol manufacture?
produces purer ethanol, is a batch process
produces purer ethanol, is a continuous process
uses a renewable resource, is a batch process
uses a renewable resource, is a continuous process
Which statements about unsaturated hydrocarbons are correct?
They contain both single and double bonds.
They turn aqueous bromine from colourless to brown.
They can be manufactured by cracking.
Which polymers have the same linkage between monomer units?
carbohydrate and polyamide
carbohydrate and polyester
protein and polyamide
protein and polyester
