No questions found
The diagram shows the result of dropping a purple crystal into water.
Which processes take place in this experiment?
[Table_1]
582
587
521
Which row about elements, mixtures and compounds is correct? [Table_1]
562
553
560
What are the relative charge and relative mass of an electron? [Table_1]
592
564
541
The atomic structures of four particles, W, X, Y, and Z, are shown in the table below. [Table_1] Which particles are isotopes of the same element?
583
556
512
Which row shows the properties of an ionic compound?
[Table_1]
552
588
506
Which row describes the formation of single covalent bonds in methane?
558
546
575
Which equation represents the neutralisation of nitric acid using sodium hydroxide?
579
503
547
What is the relative formula mass of ammonium nitrate, NH$_4$NO$_3$?
553
525
596
Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Gases X and Y are produced at the electrodes shown. What are X and Y?
557
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521
Which statement about hydrogen fuel cells is correct?
554
529
549
A reaction pathway diagram is shown. Which statement about this reaction is correct?
588
563
559
Lumps of calcium carbonate react with dilute hydrochloric acid as shown. $$\text{CaCO}_3 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2$$ Which change in conditions decreases the rate of the reaction?
568
503
568
Solid copper(II) sulfate exists in two different forms, anhydrous and hydrated. One of these forms is blue and the other is white. The change between these two forms is reversible. blue form ⇌ white form What is the blue form and how is the change from the blue form to the white form brought about? [Table_1]
553
565
577
Four redox equations and statements about the equations are shown.
[Table_1]
Which statements about the equations are correct?
584
600
537
Sodium hydroxide forms an alkaline solution with a pH of 14.
Which indicator turns yellow when added to this solution?
586
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526
Which row identifies an acidic oxide and a basic oxide? [Table_1]
502
527
514
A student makes aqueous copper(II) chloride by adding excess copper(II) carbonate to dilute hydrochloric acid. What is the next step in the method in the formation of solid copper(II) chloride?
559
539
582
Which statements about the trends across a period of the Periodic Table are correct? 1. Aluminium is more metallic than sodium. 2. Beryllium is more metallic than carbon. 3. Boron is more metallic than lithium. 4. Magnesium is more metallic than silicon.
542
514
582
Which row shows the trend in melting point, density and reactivity as Group I is descended? [Table_1]
539
536
565
Which row describes a similarity and a difference between chlorine and bromine? [Table_1]
507
500
507
Which statement describes transition elements?
525
543
517
Which diagram shows the electronic structure of a noble gas?
599
594
533
Which gas is made when powdered zinc is added to dilute hydrochloric acid?
578
539
530
Which metal is used in aircraft manufacture because it has a low density?
505
574
507
The diagram represents the structure of a solid. Which solids does the diagram represent? [Table_1: brass, graphite, sodium chloride]
503
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501
Three students, X, Y, and Z, are told that solid P reacts with dilute acids and also conducts electricity.
The table shows the students' suggestions about the identity of P.
[Table_1]
Which students are correct?
526
523
589
Which substances in the air are needed for iron to rust?
557
503
515
Part of the reactivity series of metals is shown.\n\nmetal P \n\ncarbon\n\nmetal Q \n\nmetal R\n\nDecreasing reactivity \n\nWhich row shows how each metal is extracted from its ore? \n\n[Table_1]
546
519
517
Several processes are used to treat domestic water.
Which row identifies a reason for the given process?
[Table_1]
536
577
521
Which pair of compounds make an NPK fertiliser?
590
519
534
Some information about gas X is listed.
• It is not present in clean, dry air.
• It is not a cause of respiratory problems.
• It is responsible for global warming.
What is X?
594
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512
Part of the structure of a molecule of vitamin A is shown. Which statements about this part of the structure are correct? 1. It is saturated. 2. There are two alkene groups. 3. The structure shows a carboxylic acid.
597
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519
The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the longest chain length?
546
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596
Which equation represents the cracking of an alkane?
508
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556
Which statements about ethanol are correct?
1. Ethanol is made by reacting steam with ethene at 300 \(^\circ\)C.
2. Ethanol is made by fermentation at 55 \(^\circ\)C.
3. Ethanol burns to produce carbon dioxide and water.
4. Ethanol contains a carbon–carbon double bond.
505
598
552
Which substances react with aqueous ethanoic acid to form a gas?
1. magnesium
2. magnesium carbonate
3. magnesium oxide
599
517
593
In reaction R, 2000 molecules of CH$_2$=CH$_2$ react to form a single molecule X only.\n\n$$2000 \text{ CH}_2=\text{CH}_2 \rightarrow X$$\n\nWhich terms describe reaction R, CH$_2$=CH$_2$ and X?\n\n[Table_1]
563
554
573
The concentration of acids and alkalis can be determined by titration. Which pieces of equipment are needed to perform a titration?
506
599
600
Which process is used to produce drinking water from sea water?
568
599
529
The results of two separate tests on a white solid X are shown.
[Table_1]
What is X?
532
548
534
