No questions found
Which two gases will diffuse at the same rate, at the same temperature?
588
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521
A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm$^3$ of dilute sulfuric acid. Which apparatus is essential to complete the experiment?
1 stop-clock
2 measuring cylinder
3 thermometer
4 balance
552
555
567
Which statement describes the properties of both diamond and silicon(IV) oxide?
581
600
570
Paper chromatography is used to separate four different coloured inks, W, X, Y and Z, and an unknown ink T.
The chromatogram is shown.
Which inks are present in ink T?
558
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548
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?
599
570
509
Which statement about the properties of metals is correct?
566
556
553
The equation for the reaction between barium chloride and dilute sulfuric acid is shown. $${\text{BaCl}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{BaSO}_4 + 2\text{HCl}}$$ Which row shows the state symbols for this equation?
[Table_1]
577
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599
A 0.5 g sample of calcium carbonate is reacted with excess dilute hydrochloric acid.
$\text{CaCO}_3(s) + 2\text{HCl}(aq) \rightarrow \text{CaCl}_2(aq) + \text{H}_2\text{O}(l) + \text{CO}_2(g)$
Which volume of CO₂ is produced at r.t.p.?
547
553
501
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?
[Table_1]
565
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576
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.
At which electrodes is hydrogen produced?
511
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517
Which statement about fuels is correct?
573
566
563
Which row identifies a chemical change and a physical change?
[Table_1]
595
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510
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?
[Table_1]
554
504
597
Which statement explains why increasing the concentration of a reactant increases the rate of the reaction?
520
588
593
Water is added to anhydrous copper(II) sulfate.
What happens during the reaction?
502
525
508
Which statement explains why lime is added to soil?
565
525
545
Sulfur dioxide is bubbled through water containing litmus. Which row describes and explains what happens to the litmus? [Table_1]
571
575
565
The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested.
[Table_1]
Which information about X and Y is correct?
[Table_2]
583
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547
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?
531
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506
Which ion forms a precipitate that dissolves in excess with both aqueous ammonia and with aqueous sodium hydroxide?
548
530
521
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?
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543
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 shown.
[Table_1]
Which elements are non-metals?
579
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531
Selenium is an element in Group VI. Group VI elements follow similar trends to Group VII elements. Which statement about selenium is correct?
589
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519
Which row describes the properties of a typical transition element?
[Table_1]
521
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536
Which row describes an atom of a noble gas?
[Table_1]
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546
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?
531
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500
Which substance is used to reduce zinc oxide in the manufacture of zinc?
590
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535
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?
[Table_1]
594
513
520
Nitrogen oxide, NO, is formed in the engine of petrol-powered cars.
One constituent of petrol is octane, $\text{C}_8\text{H}_{18}$.
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?
[Table_1]
541
597
505
A magnesium block is attached to iron to prevent it from rusting.
Which statement about this method of rust prevention is correct?
554
533
579
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?
523
533
571
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
521
521
530
In the Contact process, sulfur dioxide is converted into sulfur trioxide.
$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$
What is the effect of lowering the pressure on the rate of formation and percentage yield of sulfur trioxide at equilibrium?
[Table_1]
590
520
547
What are the products when limestone (calcium carbonate) is heated strongly?
507
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517
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?
[Table_1]
568
579
581
The equation for the reaction between butane, $C_4H_{10}$, and chlorine is shown.
$$C_4H_{10} + Cl_2 \rightarrow C_4H_9Cl + HCl$$
Which type of reaction does butane undergo when it reacts with chlorine?
538
543
595
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.
589
550
529
The hydrocarbon $C_{12}H_{26}$ is cracked to give X and Y, as shown.
$$C_{12}H_{26} \rightarrow X + Y$$
Which statement is correct?
548
575
567
An ester, $C_4H_8O_2$, is made by reacting 0.06 mol of ethanol, $C_2H_6O$, and 0.05 mol of ethanoic acid, $C_2H_4O_2$.
$C_2H_6O + C_2H_4O_2 \rightarrow C_4H_8O_2 + H_2O$
0.0375 mol of the ester was made.
What is the percentage yield and the $M_r$ of the ester?
[Table_1]
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524
Which type of compound is made when a protein is hydrolysed?
575
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565
