No questions found
A sugar cube is dropped into a hot cup of tea.
The tea is not stirred.
Which statement explains why the tea becomes sweet?
530
541
518
A blue solid, X, is soluble in water.
Which method is used to obtain pure solid X from an aqueous solution?
571
530
572
Two atoms, X and Y, can be represented as shown.
$^{41}_{20}X \qquad ^{45}_{20}Y$
Which statement is not correct?
523
522
587
Two atoms have the same relative atomic mass but different chemical properties.
Which row about the proton and neutron numbers of these atoms is correct?
[Table_1]
597
559
597
Which statements comparing the properties of electrons, neutrons and protons are correct?
[Table_1]
574
537
560
Diamond and graphite are both macromolecules. Which statement is not correct?
540
595
516
In which compounds are pairs of electrons shared between atoms?
1. methane
2. lead bromide
3. sodium chloride
509
528
544
Aluminium oxide has the formula $Al_2O_3$.
Which statement about aluminium oxide is correct?
506
511
551
Copper and hydrogen can each be formed by electrolysis. At which electrodes are these elements formed? [Table_1]
586
538
515
An object is electroplated with silver using an aqueous silver salt as the electrolyte. Which set of conditions is used?
[Table_1]
587
548
578
Which substance does not use oxygen to produce energy?
556
546
564
When pink crystals of cobalt(II) chloride are heated, steam is given off and the colour of the solid changes to blue.
$$ \text{CoCl}_2 \cdot 6\text{H}_2\text{O} \rightleftharpoons \text{CoCl}_2 + 6\text{H}_2\text{O} $$
What happens when water is added to the blue solid?
[Table_1]
592
594
508
The diagram shows an experiment to measure the rate of a chemical reaction. Which change decreases the rate of reaction?
520
593
576
Which reaction is \textit{not} characteristic of an acid?
562
511
561
Hydrochloric acid is used to clean metals. The acid reacts with the oxide layer on the surface of the metal, forming a salt and water. Which word describes the metal oxide?
549
566
569
Which of the following methods are suitable for preparing both zinc sulfate and copper sulfate?
1. Reacting the metal oxide with warm dilute aqueous sulfuric acid.
2. Reacting the metal with dilute aqueous sulfuric acid.
3. Reacting the metal carbonate with dilute aqueous sulfuric acid.
574
503
556
The noble gases, which are in Group 0 of the Periodic Table, are all very .......1....... .
.......2......., one of these gases, is used to provide an inert atmosphere in lamps.
Another, .......3......., is used for filling balloons because it is less dense than air.
Which words complete the sentences about noble gases?
[Table_1]
553
543
500
Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table?
[Table_1]
562
514
528
X is a Group I metal. Y and Z are Group VII elements.
When X reacts with Y a salt is formed. A solution of this salt reacts with Z to form a different salt.
What are X, Y and Z?
[Table_1]
592
539
567
In the outline of the Periodic Table below, some elements are shown as numbers.
Which two numbers are \textbf{metals} in the same period?
581
537
543
The diagrams show the structure of two substances used to make electrical conductors.
Which statement correctly describes X and Y?
525
552
532
Which statement about the uses of aluminium, mild steel and stainless steel is correct?
586
508
526
Which row describes the conditions used to make steel from the iron produced by a blast furnace? [Table_1]
540
543
565
The statements describe how different metals react with cold water.
• Calcium sinks, fizzing and releasing a steady stream of hydrogen.
• Copper does not react.
• Sodium floats, fizzing and rapidly releasing hydrogen.
• Zinc does not react but does react with steam, releasing hydrogen.
Using the information, where should hydrogen be placed in the reactivity series?
517
555
579
The diagram shows stages in producing drinking water.
In which tank is chlorine added to the water?
585
509
589
Oxygen is a reactive element. Which row shows which of oxygen's reactions are useful? [Table_1]
579
580
558
Which combination of chemical compounds could be used to produce the fertiliser shown?
[Image_1: A bag labeled 'SUPERGROW' with 'N P K 21 : 16 : 8']
563
540
519
Below are two statements about sulfur dioxide.
1. Sulfur dioxide is formed when fossil fuels burn and it is an acidic oxide.
2. Sulfur dioxide is one of the gases in the air which is responsible for 'acid rain'.
Which is correct?
582
545
534
Which method is not used for rust prevention?
520
590
574
Carbon dioxide and methane are 'greenhouse gases' which contribute to global warming.
Which process does not increase global warming?
543
578
564
Four reactions produce carbon dioxide.
1. respiration
2. fermentation
3. combustion of methane
4. manufacture of lime
Which reactions do not use oxygen from the air?
501
524
568
The diagram shows a kiln used to manufacture lime. Which row identifies X and Y?
590
553
500
Which statement about the names of organic compounds is correct?
569
521
579
Which statement about petroleum is not correct?
568
521
572
Ethene, propene and butene are all members of the same homologous series. Which statement explains why ethene, propene and butene have similar chemical properties?
500
528
542
Which statement describes the compound shown below?
555
599
557
A hydrocarbon A is cracked to make B and hydrogen. Compound C is formed by the addition polymerisation of B. To which homologous series do A, B and C belong? [Table_1]
543
576
553
Ethanol is manufactured from petroleum by reacting ethene with steam.
Which statements about this process are correct?
1. Ethene is obtained from the cracking of alkanes.
2. The process is carried out in the presence of yeast.
3. The reaction is an addition reaction.
4. The rate of reaction is increased by a catalyst.
531
546
559
