Which two gases will diffuse at the same rate, at the same temperature?
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 statement describes the properties of both diamond and silicon(IV) oxide?
Paper chromatography is used to separate four different coloured inks, W, X, Y and Z, and an unknown ink T.
The chromatogram is shown.
Particle P has an atomic number of 18, a mass number of 40 and no overall charge.
Particle Q has an atomic number of 19, a mass number of 40 and a single positive charge.
Which statement is correct?
Which statement about the properties of metals is correct?
The equation for the reaction between barium chloride and dilute sulfuric acid is shown.
Which row shows the state symbols for this equation?
A 0.5 g sample of calcium carbonate is reacted with excess dilute hydrochloric acid.
Aluminium is manufactured from aluminium oxide by electrolysis.
Which row shows the ionic half-equations at each electrode and describes the role of cryolite in the process?
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes
At which electrodes is hydrogen produced?
Which statement about fuels is correct?
Which row identifies a chemical change and a physical change?
Metal M reacts with steam and produces gas G.
Which row identifies gas G and the type of reaction when metal M reacts with steam?
Which statement explains why increasing the concentration of a reactant increases the rate of the reaction?
Water is added to anhydrous copper(II) sulfate.
What happens during the reaction?
Which statement explains why lime is added to soil?
Sulfur dioxide is bubbled through water containing litmus.
The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested.
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?
Which ion forms a precipitate that dissolves in excess with both aqueous ammonia and with aqueous sodium hydroxide?
Elements in Group IV of the Periodic Table are shown.
carbon
silicon
germanium
tin
lead
What does not occur in Group IV as it is descended?
W, X, Y and Z are elements in Period 3 of the Periodic Table.
The numbers of outer-shell electrons in an atom of each element are show
Which elements are non-metals?
Selenium is an element in Group VI.
Group VI elements follow similar trends to Group VII elements.
Which statement about selenium is correct?
Which row describes the properties of a typical transition element?
Which row describes an atom of a noble gas?
Some properties of four elements, P, Q, R and S, are shown.
Solid P reacts with dilute hydrochloric acid to give hydrogen.
Solid Q does not conduct electricity.
Solid R is used to make saucepans because it is a good conductor of heat.
Solid S reacts with oxygen to form a compound where atoms of S share electrons with
atoms of oxygen.
Which elements are metals?
Which substance is used to reduce zinc oxide in the manufacture of zinc?
Three metal compounds, J, K and L, are heated using a Bunsen burner.
The results are shown.
J colourless gas produced, which relights a glowing splint
K colourless gas produced, which turns limewater milky
L no reaction
Which row identifies J, K and L?
Nitrogen oxide, NO, is formed in the engine of petrol-powered cars.
One constituent of petrol is octane,
Nitrogen oxide is removed from exhaust fumes by catalytic converters.
Which row identifies the reactants that produce nitrogen oxide and a reaction that removes it in a
catalytic converter?
A magnesium block is attached to iron to prevent it from rusting.
Which statement about this method of rust prevention is correct?
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?
Which processes increase the amount of carbon dioxide in the air?
1 combustion of hydrogen
2 combustion of methane
3 photosynthesis by plants
4 thermal decomposition of limestone
In the Contact process, sulfur dioxide is converted into sulfur trioxide.
What is the effect of lowering the pressure on the rate of formation and percentage yield of sulfur trioxide at equilibrium?
What are the products when limestone (calcium carbonate) is heated strongly?
The structure of ester W is shown.
Which row gives the names of ester W and the carboxylic acid and alcohol from which it is made?
Butene has three structural isomers which are alkenes.
Which statements about these isomers are correct?
1 They have the same molecular formula.
2 They have different numbers of bonds in the molecule.
3 They have a C=C bond in the structure.
Which type of compound is made when a protein is hydrolysed?