No questions found
A beaker containing solid carbon dioxide is placed in a fume cupboard at room temperature. The carbon dioxide becomes gaseous.
Which process describes this change of state?
573
542
508
The pressure of a sample of gas is decreased. The temperature is kept constant.
Which row describes the effects on the particles?
[Table_1]
600
529
595
Which statement about paper chromatography is correct?
520
526
589
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?
564
528
552
Iodine, I, has a lower relative atomic mass than tellurium, Te, but is placed after it in the Periodic Table.
[Image_1: Periodic Table with elements Te and I highlighted]
Which statement explains why iodine is placed after tellurium in the Periodic Table?
551
568
513
Substance Q has a high melting point and conducts electricity both when molten and when dissolved in water. What is Q?
585
573
533
Elements X and Y form an ionic compound, XY.
In which group of the Periodic Table is X found and how is the bond between X and Y formed?
546
516
598
The structure of glycine is shown.
Which row is correct?
[Table_1]
528
521
559
Calcium phosphate forms when calcium chloride and sodium phosphate solutions react together.
$xCaCl_2 + yNa_3PO_4 \rightarrow 2Ca_3(PO_4)_2 + 12NaCl$
Which values of $x$ and $y$ balance the equation? [Table_1]
566
558
502
During the electrolysis of concentrated aqueous sodium chloride, chlorine gas is produced at the positive electrode.
What happens at the negative electrode and to the solution?
[Table_1]
506
536
583
The diagram shows an experiment to electroplate a nickel spoon with silver.
Which row correctly describes the positive electrode, the negative electrode and the electrolyte? [Table_1]
517
566
594
Which substance does not use oxygen to produce heat energy?
518
559
559
An energy level diagram for a reaction is shown.
Which statement about the reaction is correct?
568
511
504
Two reactions are done.
1. Hydrated cobalt(II) chloride is heated. It changes colour.
2. Water is added to the product of reaction 1. It becomes hotter. The original colour is produced.
Which types of reaction have occurred in reactions 1 and 2?
[Table_1]
560
567
515
Which equation shows reduction of an iron compound?
548
513
573
Calcium carbonate reacts with dilute hydrochloric acid to make carbon dioxide gas. Graph X shows the results of this experiment.
The particle size of the calcium carbonate is increased and the experiment is repeated. All other conditions are kept the same. Graph Y shows the results of this experiment.
Which diagram is correct for the two experiments?
515
516
546
Part of the Periodic Table is shown.
Which element forms an oxide that reacts with dilute acid to form a salt and water?
542
593
532
An excess of substance Z is added to some spilt acid. The solution produced as a result is neutral. What is Z?
579
518
564
Aqueous sodium hydroxide is added to solid Q in a test-tube.
A gas is produced which turns damp red litmus blue.
What is Q?
519
588
517
Potassium hydroxide is a base.
Which statement describes a reaction of potassium hydroxide?
595
555
524
Which statement about the Periodic Table is not correct?
569
597
580
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]
594
562
548
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?
572
504
515
An inert gas R is used to fill weather balloons.
Which descriptions of R are correct?
[Table_1]
593
561
546
Metal X reacts with steam but not with cold water.
What is X?
564
501
599
Which process is used to extract aluminium from bauxite?
508
516
579
Which row shows uses of the metals listed?
[Table_1]
576
586
573
Argon is a noble gas used to fill light bulbs.
What is the approximate percentage of argon in air?
581
600
540
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?
559
580
530
Which statement about air pollutants is not correct?
521
589
570
The table describes three types of water.
[Table_1]
Which statement is correct?
511
560
505
Which compound would not be used as an important part of a garden fertiliser?
526
516
526
Carbon dioxide and methane both contribute to climate change.
Which process produces both gases?
574
535
557
Which reaction is endothermic?
580
561
522
Petroleum is a mixture of different hydrocarbons.
Which process is used to separate the petroleum into groups of similar hydrocarbons?
511
573
538
Which two compounds are molecules which both contain a double bond?
563
577
562
Which pair of diagrams shows compounds belonging to the same homologous series?
503
573
559
Ethanol can be formed by:
1. fermentation
2. reaction between steam and ethene.
Which of these processes use a catalyst?
[Table_1]
599
551
509
Which statement about ethanoic acid is correct?
540
509
540
