Substances change state when their temperature is changed.
Which changes of state take place when the temperature of a substance is lowered?
1 boiling
2 condensation
3 freezing
4 melting
A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm3 of dilute sulfuric acid.
Which apparatus is essential to complete the experiment?
1 stop-clock
2 measuring cylinder
3 thermometer
4 balance
Which method is used to separate a mixture of the following liquids?
X and Y are two different elements.
X and Y have the same number of nucleons.
Which statement about X and Y is correct?
Which row identifies an alloy, a pure metal and a non-metal?
Which statement about ions and ionic bonding is correct?
Which dot-and-cross diagram shows the arrangement of outer shell electrons in a molecule of hydrogen chloride?
Which statement explains why graphite can be used as a lubricant?
A compound of element X has the formula Xâ‚‚O and a relative formula mass of 144.
What is element X?
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.
At which electrodes is hydrogen produced?
Which type of reaction occurs when calcium carbonate is heated at a high temperature to produce calcium oxide and carbon dioxide?
Which row identifies a chemical change and a physical change?
Which statement about rate of reaction is correct?
Some common household substances are tested with litmus and methyl orange.
Which statement is correct?
Water is added to anhydrous copper(II) sulfate.
What happens during the reaction?
In which equation is carbon both oxidised and reduced?
Aqueous solutions containing copper(II) ions can be identified using flame tests and by adding aqueous sodium hydroxide.
Which row describes what is observed in these tests?
The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested.
Which information about X and Y is correct?
An acid is neutralised by adding an excess of an insoluble solid base.
A soluble salt is formed.
How is the pure salt obtained from the reaction mixture?
Some statements about gas G are listed.
G is monoatomic.
G is found in clean, dry air.
G is used in lamps.
Which element is G?
Part of the Periodic Table is shown.
Which element is a metal?
The elements sodium to argon form Period 3 of the Periodic Table.
Which row describes the trend across Period 3 from left to right?
Some properties of element E are listed.
It has a high density.
It has a high melting point.
What is E?
Lithium, sodium and potassium are elements in Group I of the Periodic Table.
Chlorine, bromine and iodine are elements in Group VII of the Periodic Table.
Which row identifies the least dense of these elements in each group?
The reactions of metals P, Q, R, and S are shown.
What is the order of reactivity of the metal
Iron is extracted from hematite in the blast furnace at a temperature of about 1550°C.
Which equation shows the main reaction that increases the temperature in the furnace?
Which diagram represents the arrangement of atoms in an alloy?
Which uses of the metals shown are correct?
Which row identifies a substance present in clean air and a substance that is a pollutant in air?
Which property of sulfur dioxide explains why it is used as a food preservative?
Fertilisers are used to provide three of the elements needed for plant growth.
Which two compounds would give a fertiliser containing all three of these elements?
Compound J is an unsaturated carboxylic acid.
Which bonds are present in a molecule of J?
Petroleum is separated into useful fractions by fractional distillation.
Which fraction is used as a fuel for jet aeroplanes?
What are the products when limestone (calcium carbonate) is heated strongly?
Ethene reacts with substance X to form ethanol.
What is X?
What is the equation for the complete combustion of methane?
Alkenes can be produced by cracking large hydrocarbon molecules to form smaller hydrocarbon molecules.
The products formed by burning substance J are passed through the apparatus shown.
What is substance J?
Which statements about ethanoic acid are correct?
1 Aqueous ethanoic acid reacts with magnesium to form magnesium ethanoate.
2 Carbon dioxide is formed when aqueous ethanoic acid reacts with sodium carbonate.
3 Hydrogen is formed when aqueous ethanoic acid reacts with sodium hydroxide.
4 Ethanoic acid turns red litmus paper blue
Which statement about polymerisation is correct?