No questions found
Gases are separated from liquid air by fractional distillation. The boiling points of four gases are shown.
Which gas is both monatomic and a liquid at $-200^{\circ}\text{C}$?
[Table_1]
517
566
584
The diagrams show four pieces of laboratory equipment.
Which equipment is essential to find out if dissolving a salt in water is an exothermic process?
524
589
533
X and Y are both atoms.
X and Y have the same chemical properties as each other.
Which row describes the atomic structures of X and Y?
[Table_1]
504
532
566
Which covalent molecule contains two atoms bonded together by exactly four shared electrons?
557
588
585
The formula of ammonia is $\text{NH}_3$. Which statement about a molecule of ammonia is correct?
563
538
513
Which gas sample has the greatest mass?
594
543
529
Which sample of magnesium chloride, MgCl_2, contains the same number of moles as 69.6g of potassium sulfate, K_2SO_4?
568
546
530
Iron(III) chromate is a yellow solid. It contains the ions $\text{Fe}^{3+}$ and $\text{CrO}_4^{2-}$.
What is the formula of iron(III) chromate?
556
558
577
Electrolysis of copper(II) sulfate can be done using either carbon electrodes or copper electrodes.
Which statement describes what happens at the positive electrode?
522
553
592
The diagram shows a circuit used to electrolyse aqueous copper(II) sulfate.
Which arrows indicate the movement of the copper ions in the electrolyte and of the electrons in the external circuit?
534
507
534
Ethene burns in oxygen to form carbon dioxide and water vapour.
The bond energies are shown in the table.
[Table_1]
What is the energy change for the reaction?
591
568
545
The equation for the formation of ammonia is shown.
$\text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3$
The energy level diagram for the reaction is shown.
What is the energy change for the reaction?
578
567
535
Dilute hydrochloric acid reacts with 1 g of limestone.
Which conditions produce the fastest rate of reaction?
573
580
598
The reversible reaction between methane and steam is shown.
$ \text{CH}_4(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}(g) + 3\text{H}_2(g) $
The forward reaction is endothermic.
Which changes in pressure and temperature move the equilibrium to the right?
[Table_1]
508
571
556
The equation for the reaction between zinc and copper(II) oxide is shown.
$$\text{Zn + CuO} \rightarrow \text{ZnO + Cu}$$
Which row shows the oxidising agent and the reducing agent?
527
563
570
The results of some experiments with sulfur dioxide are shown.
experiment | description | result
1 | mix with dilute hydrochloric acid | does not react
2 | mix with concentrated sodium hydroxide | a salt forms
3 | add Universal Indicator | Universal Indicator turns purple
4 | add acidified aqueous potassium manganate(VII) | purple solution turns colourless
Which results are correct? [Table_1]
535
526
547
A white precipitate is produced when small amounts of two colourless solutions are mixed together.
Which pairs of solutions produce a white precipitate?
1 sodium hydroxide and zinc nitrate
2 sodium hydroxide and aluminium chloride
3 barium chloride and sulfuric acid
4 acidified barium nitrate and potassium sulfate
517
539
571
Solution Q is warmed with ammonium chloride.
In a separate experiment, solution Q is added to methyl orange.
Which observations show that solution Q is basic?
516
584
573
Some general rules for the solubility of salts in water are listed.
- Carbonates are insoluble (except ammonium carbonate, potassium carbonate and sodium carbonate).
- Chlorides are soluble (except lead(II) chloride and silver chloride).
- Nitrates are soluble.
- Sulfates are soluble (except barium sulfate, calcium sulfate and lead(II) sulfate).
Which substances produce an insoluble salt when aqueous solutions of them are mixed?
547
574
570
Elements in Group I of the Periodic Table react with water.
Which row describes the products made in the reaction and the trend in reactivity of the elements?
[Table_1]
600
544
593
The equation shows the reaction between a halogen and aqueous bromide ions.
$$ X_2 + 2Br^- \rightarrow 2X^- + Br_2 $$ ......1...... ......2...... ......3......
Which words complete gaps 1, 2 and 3?
556
535
543
An inert gas R is used to fill weather balloons.
Which descriptions of R are correct?
[Table 1]
581
525
528
Heating copper(II) carbonate produces copper(II) oxide and carbon dioxide.
Heating the copper(II) oxide formed with carbon produces copper.
Which colour changes are observed during these reactions?
532
589
549
Calcium reacts with cold water to produce hydrogen.
Lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam.
Silver does not react with either air or water.
Zinc reacts when heated with steam to produce hydrogen.
What is the order of reactivity starting with the least reactive?
[Table_1]
511
553
573
Which row describes the use of a metal and the property upon which the use depends?
[Table_1]
521
559
577
Which statement about the manufacture of aluminium by electrolysis is correct?
553
559
581
Ammonia is manufactured by the Haber process from nitrogen and hydrogen. Which row gives the main sources of these two gases? [Table_1]
557
523
599
Which equation represents the incomplete combustion of propane, $C_3H_8$?
517
566
534
Argon is a noble gas used to fill light bulbs.
What is the approximate percentage of argon in air?
558
585
510
The diagrams show experiments involving the rusting of iron.
A student predicted the following results.
1 In tube P, the iron nails rust.
2 In tube Q, the iron nails do not rust.
3 In tube R, the iron nails do not rust.
Which predictions are correct?
528
520
506
Which statement about the carbon cycle is correct?
524
501
527
Which statement about sulfur or one of its compounds is correct?
594
504
525
Which equation represents the formation of lime?
514
500
539
Which equation representing a reaction of methane is correct?
559
543
523
Which two compounds are molecules which both contain a double bond?
508
502
575
Ethanol can be formed by:
1. fermentation
2. reaction between steam and ethene.
Which of these processes use a catalyst?
[Table_1: See image above]
533
596
555
Sugar can be fermented to produce ethanol.
Some of the stages in the process to produce and purify ethanol are listed.
1 Leave in a warm place.
2 Add yeast.
3 Fractionally distil the solution.
4 Dissolve the sugar in water.
5 Filter to remove the yeast.
6 Crush some sugar cane.
What is the correct order of these stages?
527
572
542
Which statement about ethanoic acid is correct?
587
529
546
The structure of a polymer is shown: .
Which monomer is used to make this polymer?
583
513
536
