No questions found
A gas is heated. The pressure is kept constant.
Which statement describes the behaviour of the particles in the gas?
531
501
577
In which state does 1 dm3 of methane contain the most particles?
560
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549
The chromatogram obtained from four mixtures of dyes, P, Q, R and S, is shown.
What is the total number of different dyes identified in the four mixtures?
526
578
510
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?
[Table_1]
568
558
506
How many neutrons are present in the atom $^{45}_{21}\text{X}$?
528
524
596
Strontium nitrate is an ionic compound.
Cyclohexane is a covalent compound.
Which row describes a property of each compound?
[Table_1]
555
578
547
Ionic bonds are formed when elements from Group I and Group VII react together.
Which statement about ions or ionic compounds is not correct?
589
522
504
What is the relative formula mass of $\text{Mg(OH)}_2$?
535
581
566
Calcium carbonate, $\text{CaCO}_3$, reacts with dilute hydrochloric acid to produce carbon dioxide.
The equation for the reaction is shown. The relative formula mass of calcium carbonate is 100.
$\text{CaCO}_3 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2$
10g of calcium carbonate is reacted with an excess of dilute hydrochloric acid.
Which mass of carbon dioxide is produced?
508
545
514
Concentrated hydrochloric acid and dilute sulfuric acid were electrolysed in separate experiments using carbon electrodes.
Which statement is correct for both electrolysis experiments?
553
509
521
Aqueous nickel(II) sulfate is used as the electrolyte to electroplate a piece of steel with nickel. Which materials are used as the negative electrode and positive electrode? [Table_1]
574
553
564
Which substance does not use oxygen to produce heat energy?
533
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538
Equal volumes and concentrations of dilute hydrochloric acid and aqueous sodium hydroxide are mixed. The temperatures of the solutions are shown.
[Table_1]
Which statement describes the reaction?
592
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532
A student heats hydrated copper(II) sulfate. The blue crystals change to a white powder. How can the student reverse this reaction?
574
535
505
Which compound is written with the oxidation state (VII)?
591
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543
Magnesium powder reacts with an excess of dilute hydrochloric acid to produce hydrogen gas. Which statements about this reaction are correct?
1. The smaller the particles of magnesium powder, the slower hydrogen is produced.
2. The higher the temperature, the faster the magnesium powder disappears.
3. The lower the concentration of dilute hydrochloric acid, the faster the rate of reaction.
4. The faster the magnesium powder disappears, the faster the rate of reaction.
503
564
548
In which row are the oxides correctly identified?
[Table_1]
| acidic | basic | |
|---|---|---|
| A | magnesium oxide, calcium oxide | sulfur dioxide, carbon dioxide |
| B | magnesium oxide, sulfur dioxide | carbon dioxide, calcium oxide |
| C | sulfur dioxide, carbon dioxide | calcium oxide, magnesium oxide |
| D | sulfur dioxide, magnesium oxide | calcium oxide, carbon dioxide |
529
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511
The following steps are done to prepare solid magnesium sulfate.
1. filtration
2. measurement of 20 cm$^3$ of dilute sulfuric acid using a measuring cylinder
3. evaporation
4. addition of an excess of solid magnesium carbonate to dilute sulfuric acid
What is the correct order for these steps?
542
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518
When dilute sulfuric acid is added to solid X, a colourless solution is formed and a gas is produced.
What is X?
572
504
529
A few drops of methyl orange are added to a reaction mixture.
During the reaction, a gas is produced and the methyl orange turns from red to orange.
What are the reactants?
507
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598
The positions of two elements, P and Q, in the Periodic Table are shown.
P and Q react together to form a compound.
What is the formula of the compound?
546
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541
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]
543
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517
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?
514
596
502
An inert gas R is used to fill weather balloons.
Which descriptions of R are correct?
[Table_1]
588
523
584
Four metals, W, X, Y and Z, are separately reacted with water and dilute hydrochloric acid.
The results are shown.
[Table_1]
What is the order of reactivity of the four metals starting with the least reactive?
551
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Part of the reactivity series is shown.
potassium most reactive
carbon
zinc
iron
copper least reactive
Which metal must be extracted from its ore by electrolysis?
585
542
549
Which statement about the uses of metals is not correct?
505
521
574
Argon is a noble gas used to fill light bulbs. What is the approximate percentage of argon in air?
552
505
536
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?
521
508
506
Which statements about sulfur dioxide pollution are correct?
1. It increases the pH of rivers.
2. It damages limestone buildings.
3. It causes respiratory problems.
558
543
551
The table describes three types of water.
[Table_1]
Which statement is correct?
561
552
570
Which compound would not be used as an important part of a garden fertiliser?
510
597
541
Carbon dioxide and methane both contribute to climate change. Which process produces both gases?
542
503
592
What is not a use of lime?
541
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519
Petroleum is a mixture of different hydrocarbons.
Which process is used to separate the petroleum into groups of similar hydrocarbons?
559
579
553
Which two compounds are molecules which both contain a double bond?
527
586
549
Which molecule does not belong to the alcohol homologous series?
560
586
540
Ethanol can be formed by:
1. fermentation
2. reaction between steam and ethene.
Which of these processes use a catalyst?
[Table_1]
600
525
537
Ethanolic acid is a weak acid.
Which statements about ethanolic acid are correct?
1. It turns Universal Indicator purple.
2. It reacts with magnesium to form hydrogen gas.
3. It reacts with calcium carbonate to form carbon dioxide gas.
4. It decolourises aqueous bromine.
544
572
533
