80 questions · 80 marks · ≈ 1 hour · spans 26 of 26 topics
Assembled from the topic question banks — not an official Cambridge International paperCopper(II) sulfate can be prepared by reacting solid copper(II) carbonate with hot sulfuric acid. The alkali solid is always added in excess.
Why is the solid reactant added in excess?
Choose your answer
To ensure all of the acid reacts.
To make the reaction go faster.
To ensure all of the solid reactant has reacted.
To increase the product yield.
The X+ ion of element X has 16 electrons and a nucleon number of 37.
What is the correct Group number for element X?
Choose your answer
VII
VIII
III
I
Extended tier only
Which statement correctly describes the bonding in metals?
Choose your answer
A lattice of negative ions in a “sea of electrons”.
A lattice of positive ions in a “sea of electrons”.
A lattice of neutral atoms with delocalised electrons.
A lattice of negative ions with delocalised electrons.
Extended tier only
The reaction profile for making nitrogen monoxide, NO, is shown below:
What is the activation energy for this reaction?
Choose your answer
+140 kJ
+180 kJ
+320 kJ
-330 kJ
Catalysts are often used in chemical reactions.
Which letter represents two correct features of catalysts?
| Feature 1 | Feature 2 | |
|---|---|---|
| A | Lower activation energy for the reaction | More products made in total |
| B | Alternative pathway for the reaction is provided | Not used up over the course of the reaction |
| C | Makes industrial processes cheaper | Metal catalysts are cheap to buy |
| D | Reduce the overall energy change of the reaction | Can be present in biological systems as enzymes |
Choose your answer
When copper is heated in air, its surface turns black.
What is happening to the copper in this reaction?
Choose your answer
Copper undergoes thermal decomposition
Copper is oxidised
Copper burns with a lilac flame
Copper is reduced
Four chemical processes are described below. Which reactions contribute to global warming?
| 1 | Reacting hydrochloric acid with magnesium carbonate. |
|---|---|
| 2 | The complete combustion of propane. |
| 3 | Heating calcium carbonate. |
| 4 | Reacting sodium hydroxide with magnesium carbonate. |
Choose your answer
1, 2 & 3
1 & 4
1, 3 & 4
All 4
Potable water is produced from a water source near a country spring as shown in the flow diagram.
Which processes occur at P and Q?
| P | Q | |
|---|---|---|
| A | chlorination | filtration |
| B | chlorination | distillation |
| C | filtration | distillation |
| D | filtration | chlorination |
Choose your answer
In a fuel cell ............1........... energy is converted to ..................2................ energy.
| 1 | 2 | |
|---|---|---|
| A | electrical | heat |
| B | chemical | electrical |
| C | potential | chemical |
| D | chemical | heat |
Choose your answer
A student titrated sodium carbonate solution against 25 cm3 of hydrochloric acid.
They used methyl orange as an indicator.
What is the colour changed observed at the end point?
Choose your answer
red to yellow
yellow to orange
yellow to red
red to orange
Paper chromatography was used to determine if a banned preservative, X, is present in four samples obtained from four different packaged foods labelled A, B, C and D.
The results of the analysis of the foodstuffs are shown in the diagram below.
Which foodstuff contains X?
Choose your answer
Iron is extracted from hematite, Fe2O3, in a blast furnace. Limestone is also added to the furnace.
What is the purpose of the limestone?
Choose your answer
To remove impurities from the iron ore
To heat up the blast furnace
To reduce the hematite
To neutralise acidic gases
Properties of four elements are shown below.
Which of these elements is a metal?
| electrical conductivity when solid | electrical conductivity when liquid | melting point ℃ | |
|---|---|---|---|
| A | low | low | -7 |
| B | high | low | 801 |
| C | high | high | 1535 |
| D | low | low | 3550 |
Choose your answer
Extended tier only
The following section of the reactivity series shows a newly discovered element, Y. The only oxide of Y has the formula YO.
Ca
Mg
Fe
Y
H
Cu
Which of the equations shows a reaction which would take place?
Choose your answer
2 Y(s) + Cu2+(aq) → 2 Y+(aq) + Cu(s)
Y(s) + Fe2O3(s) → 2 Fe(s) + 3 YO(s)
Y(s) + 2 HCl (aq) → YCl2(aq) + H2(g)
Cu(s) + Y2+(aq) → Cu2+(aq) + Y(s)
Which of the following structures shows a compound that belongs to a different homologous series to octane?
Choose your answer
Which of the equations show the incomplete combustion of methane?
Choose your answer
2 CH4 + 4O2 → 2 CO2 + 4 H2O
CH4 + O2 → C + 2 H2O
CH4 + O2 → C + 2 H2
2 CH4 + 4 O2 → 2 CO2 + 4 H2
Extended tier only
Which statement about polymers is correct?
Choose your answer
Addition polymers are all biodegradable.
Condensation polymers can all be hydrolysed to give amino acids.
Condensation polymers only exist in nature.
Forming addition polymers produces only one product.
Extended tier only
Matter exists in three states which are solid, liquid and gas. Phase changes occur when matter changes from one state to another.
In which changes do the particles move closer together?
gas rightwards harpoon over leftwards harpoon from 3 to 1 of liquid rightwards harpoon over leftwards harpoon from 4 to 2 of solid
Choose your answer
3 and 4
1 and 3
4 only
1 and 2
Extended tier only
Dilute sulfuric acid and barium chloride solution react to produce barium sulfate and hydrochloric acid, as shown in the reaction below:
H2SO4 + BaCl2 → BaSO4 + 2 HCl
Which row represents the correct state symbols for the reaction?
| H2SO4 | BaCl2 | BaSO4 | HCl | |
|---|---|---|---|---|
| A | (aq) | (l) | (s) | (aq) |
| B | (l) | (aq) | (aq) | (l) |
| C | (aq) | (aq) | (s) | (aq) |
| D | (l) | (aq) | (l) | (aq) |
Choose your answer
A solution of a lithium halide and a halogen are mixed together. A reaction occurs and the mixture darkens in colour.
What is present in the reaction mixture?
Choose your answer
Bromine and lithium chloride
Bromine and lithium fluoride
Chlorine and lithium iodide
Chlorine and lithium fluoride
The elements of the Periodic table can be broadly classified into two main characters which are metals and nonmetals. Which statements are correct?
| 1 | Magnesium is more metallic than silicon. |
|---|---|
| 2 | Boron is more metallic than lithium. |
| 3 | Carbon is less metallic than beryllium. |
| 4 | Sodium is less metallic than aluminium. |
Choose your answer
1 and 3
1 and 2
2, 3 and 4
1, 2 and 4
Extended tier only
Silver chloride can be prepared by the reaction of silver nitrate solution with potassium chloride solution.
Which statement about the preparation is correct?
Choose your answer
To get the maximum yield of product you need to have excess silver nitrate
To get the maximum yield of product you need to have excess potassium chloride
Equal volumes of the two solutions should be used
Equal concentrations of the two solutions should be used
The pH of two samples of different dilute acids were found.
Acid X had a pH of 6
Acid Y had a pH of 3
Which statement is correct?
Choose your answer
The hydrogen ion concentration of acid X is 1000 times greater than acid Y
The hydrogen ion concentration of acid Y is 3 times greater than acid X
The hydrogen ion concentration of acid Y is 1000 times greater than acid X
The hydrogen ion concentration of acid X is 100 times greater than acid Y
Substances can be broadly classified into three categories which are elements, compounds and mixtures.
Which of the following statements is correct?
Choose your answer
Elements contain different atoms
Compounds consist of elements that are not chemically combined
Mixtures consist of elements that are chemically combined
A mixture can contain elements and compounds
Extended tier only
Metals are malleable and ductile and can be hammered and pulled into useful shapes.
Which statement correctly explains these properties?
Choose your answer
Layers of atoms in the metal lattice are rigid and held strongly together so they cannot move.
Layers of atoms in a metal can slide over one another and break the attractive forces that hold them together.
Layers of atoms in a metal can slide over one another and new attractive forces are formed between the metal ions and the delocalised electrons.
Layers of atoms in a metal cannot slide over one another and the attractive forces between the metal ions and the delocalised electrons are unbreakable.
The bonding present in a substance determines the structure and properties of that substance.
Which of the following statements is a correct description of the structure of an ionic compound?
Choose your answer
A lattice structure with an irregular arrangement of alternating positive and negative ions
A lattice structure with a regular arrangement of alternating positive and negative ions
A random structure with a regular arrangement of alternating positive and negative ions
A random structure with an irregular arrangement of alternating positive and negative ions
Atoms P and Q have electronic structures as shown in the diagram. They react together to form a covalent compound.
What is the formula of the compound?
Choose your answer
P2Q3
P3Q
P3Q2
PQ4
Extended tier only
An energy level diagram is shown below.
Which row is correct for the points labelled 1, 2 and 3?
| 1 | 2 | 3 | |
|---|---|---|---|
| A | activation energy | energy change | reactants |
| B | energy change | activation energy | products |
| C | energy change | activation energy | reactants |
| D | activation energy | energy change | products |
Choose your answer
A student was measuring the rate of reaction using the apparatus in the diagram.
What reaction is the student studying?
Choose your answer
CaO + H2SO4 → CaSO4 + H2O
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
Fe + H2SO4 → FeSO4 + H2
KCl + AgNO3 → KNO3 + AgCl
Magnesium reacts with iron(III) oxide in the following reaction.
magnesium + iron(III) oxide → magnesium oxide + iron
Which statement about this reaction is correct?
Choose your answer
Magnesium oxide is reduced
Iron is oxidised
Magnesium is oxidised
Iron(III) oxide is oxidised
Oxides, XO and YO2 are released into the air from power stations and car exhausts.
What are X and Y?
| X | Y | |
|---|---|---|
| A | carbon and nitrogen | carbon and nitrogen only |
| B | carbon and nitrogen | carbon, nitrogen, and sulfur |
| C | carbon only | sulfur only |
| D | carbon only | sulfur and nitrogen only |
Choose your answer
Which row correctly identifies the substance based on the experiment and observations carried out?
| Experiment | Observations | Identity of bold substance | |
|---|---|---|---|
| A | Pink crystals are heated | The crystals turn blue and steam is given off | anhydrous cobalt(II) chloride |
| B | Water is added to a white solid | The white solid turns blue | anhydrous copper(II) sulfate |
| C | Blue crystals are heated | The crystals turn white and steam is given off | anhydrous cobalt(II) chloride |
| D | Water is added to a blue solid | The blue solid turns pink | hydrated copper(II) sulfate |
Choose your answer
A student was investigating the electrolysis of zinc chloride.
What is the correct reason for electrolysis not working?
Choose your answer
Solid zinc chloride has been used
The electrodes don't conduct electricity
The power supply is not connected properly
The crucible is too small to allow ions to flow
A student performed a titration to find the volume of hydrochloric acid required to neutralise 25.0 cm3 of sodium hydroxide using the following method.
Another student suggested the following changes.
| 1 | Use a pipette to measure the sodium hydroxide |
|---|---|
| 2 | Use universal indicator as the indicator |
| 3 | Repeat the experiment until the results are concordant |
| 4 | Ensure that the initial volume of hydrochloric acid reads 0.00 cm3 on the burette |
Which suggestions would improve the experiment?
Choose your answer
1 and 2
1 and 3
2 and 3
3 and 4
A student tested copper sulfate solution and potassium iodide solution using flame tests using the method shown.
The student’s method did not produce the distinct lilac flame colour using potassium iodide solution.
Which statement would not cause the lack of lilac flame?
Choose your answer
The metal wire loop being overheated
Using the safety flame of the Bunsen burner
The same metal wire loop being used for each experiment
The metal wire loop being dipped in concentrated acid and burned between flame tests
Rocksalt is the mineral form of sodium chloride. It is known to commonly contain sodium chloride and sand along with other trace impurities.
A combination of physical changes and separation techniques can be used to produce higher purity sodium chloride and sand.
What is the correct order of physical changes and separation techniques to separate sodium chloride and sand?
Choose your answer
Melting, filtering, crystallising
Melting, filtering
Dissolving, filtering, crystallising
Dissolving, crystallising
Which of the following metals can not be extracted from its ore by reduction?
Choose your answer
Iron
Zinc
Copper
Lithium
Brass is an alloy of two metals.
Which row describes the correct use of the two metals that brass is made from?
| metal 1 | metal 2 | |
|---|---|---|
| A | galvanising steel | making aircraft |
| B | electrical wiring | galvanising steel |
| C | making aircraft | making cutlery |
| D | making cooking pans | electrical wiring |
Choose your answer
Four metals, P, Q, R, and S, are each placed in separate test tubes containing dilute hydrochloric acid. The observations are recorded in the table below.
| metal | observation with dilute hydrochloric acid |
|---|---|
| P | no reaction |
| Q | slow bubbles of gas produced |
| R | rapid bubbling, test tube becomes warm |
| S | moderate bubbles of gas produced |
Which row shows the correct order of reactivity and correctly identifies the metal that is copper?
| order of reactivity (most to least) | copper | |
|---|---|---|
| A | R, S, Q, P | P |
| B | R, S, Q, P | Q |
| C | P, Q, S, R | P |
| D | R, Q, S, P | P |
Choose your answer
The structures of four organic compounds are shown.
Which one does not show the displayed formula of the compound?
Choose your answer
The apparatus below was used to test gas Y
The bromine solution quickly went colourless.
What is the correct structure of gas Y?
Choose your answer
Extended tier only
The diagram shows the structure of an important product.
This product is formed by …... 1 .….. of an .….. 2 …… .
Which words complete gaps 1 and 2?
| 1 | 2 | |
|---|---|---|
| A | addition polymerisation | alkane |
| B | addition polymerisation | alkene |
| C | cracking | alkane |
| D | cracking | alkene |
Choose your answer
Substance X can occur in three different physical states as shown in the diagram.
Which statement is correct?
Choose your answer
In state 1 the particles vibrate around fixed positions but don't move
Diffusion occurs in the phase change from state 1 to 2
The volume of the substance in state 3 is fixed
Condensation occurs in the phase change from state 3 to 2
Extended tier only
Nitric acid and potassium hydroxide react in a neutralisation reaction to produce salt and water, as shown by the equation below:
HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(l)
Which row describes the spectator ions and the net ionic equation for the reaction?
| spectator ions | net ionic equation | |
|---|---|---|
| A | NO3- and K+ | NO3-(aq) + K+(aq) → KNO3(aq) |
| B | H+ and OH- | NO3-(aq) + K+(aq) → KNO3(aq) |
| C | NO3- and K+ | H+(aq) + OH-(aq) → H2O(l) |
| D | H+ and OH- | H+(aq) + OH-(aq) → H2O(l) |
Choose your answer
Extended tier only
Magnesium nitride and water react to produce a precipitate of magnesium hydroxide and ammonia gas.
Mg3N2 + 6 H2O → 3 Mg(OH)2 + 2 NH3
How much magnesium nitride is needed to produce 87 g of the precipitate in excess water?
Choose your answer
24 g
50 g
30 g
12 g
X, Y and Z are the halogens chlorine, bromine and iodine, but not necessarily in that order.
When aqueous Y is added to an aqueous solution containing ions of Z, a brown solution is formed. When aqueous X is added to an aqueous solution containing ions of Z, no reaction occurs
Which row correctly identifies halogens X, Y and Z?
| X | Y | Z | |
|---|---|---|---|
| A | bromine | chlorine | iodine |
| B | iodine | chlorine | bromine |
| C | iodine | bromine | chlorine |
| D | chlorine | iodine | bromine |
Choose your answer
The early Periodic table was used to classify the known elements and was used to predict the properties of the elements that had not yet been discovered.
Which row correctly describes how this was possible?
Choose your answer
Elements in the same Period displayed similar properties.
The arrangement of the known elements provided trends in behaviour which was used to make predictions about the unknown elements.
Elements in different Groups displayed similar properties.
The unknown elements were used to fill the gaps in the original Periodic table and were placed according to their physical properties.
A substance reacts with dilute H2SO4 to form a salt which is separated by filtration.
What is the substance?
Choose your answer
Aqueous sodium hydroxide
Aqueous barium chloride
Copper
Copper(II) carbonate
Which words complete the gaps 1 & 2 in these sentences?
Aqueous solutions of acids contain 1 ions and aqueous solutions of alkalis contain 2 ions.
| 1 | 2 | |
|---|---|---|
| A | Na+ | OH– |
| B | OH– | H+ |
| C | H+ | Cl– |
| D | H+ | OH– |
Choose your answer
Extended tier only
Which row correctly describes the number of outer shell electrons and properties of isotopes?
| Number of electrons | Chemical properties | |
|---|---|---|
| A | same | same |
| B | same | different |
| C | different | same |
| D | different | different |
Choose your answer
Extended tier only
Metallic bonds are very strong and give metals their properties. Which of the following definitions is correct for a metallic bond?
Choose your answer
A metallic bond is formed by the electrostatic attraction that occurs due to electron transfer between metal atoms.
A metallic bond is formed by the electrostatic attraction between the positive ions and the delocalised electrons.
A metallic bond is formed by the electrostatic attraction that occurs due to the uneven sharing of electrons between metal atoms.
A metallic bond is formed by the intermolecular forces between the positive metal ions and the delocalised electrons.
The ionic lattice structure of potassium chloride is shown below.
Which of the following statements best describes the bonding and structure of KCl?
Choose your answer
A small lattice structure held together by electrostatic forces between oppositely charged ions which act in all directions.
A small lattice structure held together by electrostatic forces between like charged ions which act in all directions.
A giant lattice structure held together by electrostatic forces between oppositely charged ions which act in all directions.
A giant lattice structure held together by electrostatic forces between oppositely charged ions which act in one direction only.
Which of the following compounds are formed by covalent bonding?
| 1 | Potassium fluoride |
|---|---|
| 2 | Propane |
| 3 | Carbon dioxide |
| 4 | Lithium bromide |
Choose your answer
2 and 3
2 and 4
1, 2 and 3
1 and 4
The table shows the change in temperature of four different reactions W, X, Y and Z.
| initial temperature / °C | final temperature / °C | |
|---|---|---|
| W | 10 | 20 |
| X | 23 | 25 |
| Y | 15 | 13 |
| Z | 22 | 12 |
Which row is correct?
Choose your answer
W is the most exothermic reaction.
W and X are endothermic reactions.
Z is the most exothermic reaction.
Y and Z are exothermic reactions.
Extended tier only
Which of the following statements best describes the activation energy of a reaction?
Choose your answer
The minimum energy released when colliding particles react.
The minimum energy required for particles to react when they collide.
The maximum energy required for particles to react when they collide.
The maximum energy released when colliding particles react.
Copper(II) oxide reacts with hydrogen gas.
CuO (s) + H2 (g) → Cu (s) + H2O (l)
Which substance is reduced?
Choose your answer
CuO
H2
Cu
H2O
Which of the following equations would not occur inside a catalytic converter?
Choose your answer
2NO → N2 + O2
N2 + 2CO2 → 2NO + 2CO
2NO2 → N2 + 2O2
2CO + O2 → 2CO2
Which is the correct reason for carrying out each step when treating water?
| Adding carbon | Chlorination | Sedimentation | |
|---|---|---|---|
| A | kill microbes | remove salts | remove solids |
| B | remove salts | remove odours | kill microbes |
| C | remove odours | kill microbes | remove solids |
| D | remove odours | remove solids | remove salts |
Choose your answer
Hydrogen-oxygen fuel cells can be used to power motor vehicles.
What is the correct balanced symbol equation for the reaction that occurs in a hydrogen-oxygen fuel cell?
Choose your answer
H2O → H2 + O2
H2 + O2 → 2H2O
2H2 + O2 → 2H2O
H2 + O2 → H2O
A student is following the written procedure for an experiment. The instruction states:
'Quickly add 25 cm3 of sodium hydroxide'
Which piece of apparatus would be most suitable to use?
Choose your answer
Burette
Conical flask
Measuring cylinder
Volumetric pipette
Which reaction would result in the production of a gas that would produce a squeaky pop with a lit splint?
Choose your answer
Iron(II) oxide + sulfuric acid
Methane + oxygen during complete combustion
Magnesium + hydrochloric acid
Carbon dioxide and water in the presence of light and chlorophyll
A student performs a technique using the apparatus shown.
Which separation technique has the student performed?
Choose your answer
Crystallisation
Evaporation
Distillation
Filtration
Tin is less reactive than iron and the metal is extracted from its ore cassiterite, SnO2.
Which of the following statements are correct?
Choose your answer
1, 2 & 3
1 & 2 only
1 & 3 only
2 & 3 only
Most of the elements on the Periodic Table are metals. Metals can be distinguished from non-metals by differences in their physical properties.
Which row correctly describes a metal?
| Malleability | Heat & electrical conductivity | |
|---|---|---|
| A | ✓ | |
| B | ✓ | |
| C | ✓ | ✓ |
| D |
Choose your answer
Five different metals P, Q, R, S and T were reacted with dilute hydrochloric acid.
The volume of hydrogen gas produced after one minute was measured. The results are shown in the bar chart below:
What is the order of reactivity of the metals?
| most reactive | → | → | → | least reactive | |
|---|---|---|---|---|---|
| A | P | Q | R | S | T |
| B | R | P | S | Q | T |
| C | T | Q | S | P | R |
| D | T | S | R | Q | P |
Choose your answer
The diagram below shows some simple hydrocarbons and the products of two reactions.
Which of these structures are named correctly?
| Structure 1 | Structure 2 | Structure 3 | |
|---|---|---|---|
| A | x | ✔ | ✔ |
| B | ✔ | ✔ | ✔ |
| C | x | ✔ | x |
| D | ✔ | x | ✔ |
Choose your answer
Ethanol can be produced from substance Y.
substance Y + steam ethanol
What is substance Y?
Choose your answer
Ethane
Ethene
Carbon dioxide
Hydrogen
Extended tier only
A polymer can be made from methylpropene.
Which diagram shows the structure of the polymer?
Choose your answer
Extended tier only
Which words complete the gaps 1 & 2 in these sentences?
As the temperature of air in a balloon ............1.............. the volume increases. When the volume of air in a balloon increases the pressure ...............2...................
| 1 | 2 | |
|---|---|---|
| A | increases | increases |
| B | increases | decreases |
| C | decreases | increases |
| D | decreases | decreases |
Choose your answer
Iron(III) chloride is an ionic compound.
What is the formula of iron(III) chloride?
Choose your answer
FeCl
FeCl2
FeCl3
Fe3Cl
Extended tier only
Aluminium and oxygen react to produce aluminium oxide.
4 Al + 3 O2 → 2 Al2O3
How many kilograms of aluminium oxide are formed when 5.4 kg of aluminium react with excess oxygen?
Choose your answer
5.4 kg
88 kg
10.2 kg
33.6 kg
Properties of four alkali metals labelled are shown in the table. Which one is placed lowest in the group?
| **melting point / **oC | density / g cm-3 | |
|---|---|---|
| A | 39 | 1.50 |
| B | 28.5 | 1.93 |
| C | 98 | 0.98 |
| D | 63.5 | 0.86 |
Choose your answer
Oxygen, sulfur, selenium and tellurium are Group VI elements. What do all these elements have in common?
Choose your answer
They all have 6 outer shell electrons and similar physical properties.
They are all non-metals.
They all have 5 outer shell electrons and similar chemical properties.
They all have 6 outer shell electrons and similar chemical properties.
A student prepares pure hydrated copper(II) sulfate crystals from copper(II) oxide and dilute sulfuric acid.
Which row shows the correct order of steps for this preparation?
Choose your answer
add excess copper(II) oxide → filter → evaporate filtrate to point of crystallisation → cool
add excess copper(II) oxide → evaporate mixture to point of crystallisation → filter → cool
add excess copper(II) oxide → filter → heat filtrate until dry → cool
add excess copper(II) oxide → evaporate mixture until dry → cool → filter
Hydrochloric acid is often used to clean metals by reacting with the surface coating which develops on some metals when exposed to the atmosphere.
Which row correctly describes the surface coating on these metals?
| name | acidic or basic | reacts with | |
|---|---|---|---|
| A | oxide | basic | acid |
| B | oxide | acidic | basic |
| C | alloy | acidic | basic |
| D | alloy | basic | acid |
Choose your answer
The atomic number of element Q is 9 and its mass number is 19.
In which group of the Periodic Table should element Q be placed?
Choose your answer
Group 0
Group I
Group VII
Group II
The structures of two solids X and Y are shown below.
What are the correct uses of these structures?
| X | Y | |
|---|---|---|
| A | industrial lubricating | glass cutters |
| B | industrial lubricating | industrial lubricating |
| C | glass cutters | industrial lubricating |
| D | glass cutters | glass cutters |
Choose your answer
The electronic structures of atoms X and Y are shown.
X and Y combine by ionic bonding.
What is the formula of the compound produced?
Choose your answer
X2Y
X2Y2
X2Y4
XY
Extended tier only
Which statement about methane is correct?
Choose your answer
It has a high melting point due to strong covalent bonds between atoms
It has a low melting point due to weak covalent bonds between the molecules
It has a low boiling point due to weak intermolecular forces between molecules
It has a high boiling point because of strong intermolecular forces between molecules
What is the reading on the following thermometer?
Choose your answer
28.3 oC
28.6 oC
29.2 oC
28.5 oC