No questions found
In which changes do the particles move further apart?
$$ ext{gas} \stackrel{W}{\rightleftharpoons} \text{liquid} \stackrel{X}{\rightleftharpoons} \text{solid}$$
567
572
539
Chromatography experiments are carried out on four substances, P, Q, R, and S. The same solvent is used in each experiment. The resulting chromatograms are shown below. Which statement is not correct?
512
523
559
One of the instructions for an experiment reads as follows.
Quickly add 50 cm$^3$ of acid.
What is the best piece of apparatus to use?
512
500
512
The structures of diamond and graphite are shown.
Which statement about diamond and graphite is not correct?
502
596
519
The table shows the electronic structure of four atoms.
[Table_1]
Which two atoms combine to form a covalent compound?
525
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565
The table shows the atomic structure of four atoms. Which atom is \textit{not} a metal?
[Table_1]
574
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514
Potassium, K, forms a compound with fluorine, F.
Which statements about this compound are correct?
1. The compound is ionic.
2. The formula of the compound is KF.
3. The compound is soluble in water.
534
516
550
The equation shows the reaction between magnesium and sulfuric acid. [A_r: H, 1; O, 16; Mg, 24; S, 32]
$$\text{Mg} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2$$
In this reaction, which mass of magnesium sulfate is formed when 6g of magnesium react with excess sulfuric acid?
595
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544
The diagram shows an electrical cable.
Which statement about the substances used is correct?
546
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544
Electricity is passed separately through concentrated hydrochloric acid, concentrated aqueous sodium chloride and dilute sulfuric acid. In which rows are the electrolysis products correctly named?
[Table]
| | cathode product | anode product |
|----|-----------------|--------------|
| 1 | hydrogen | chlorine |
| 2 | sodium | chlorine |
| 3 | hydrogen | oxygen |
600
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The energy level diagram shows the energy of the reactants and products in a chemical reaction.
Which row correctly describes the energy change and the type of reaction shown?
595
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553
The diagram shows some properties that substances may have. To which labelled part of the diagram does $^{235}\text{U}$ belong?
589
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A liquid X reacts with solid Y to form a gas. Which two diagrams show suitable methods for investigating the rate (speed) of the reaction?
573
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Magnesium is reacted with a dilute acid. The hydrogen gas is collected and its volume measured. The results are shown on the graph. Between which times was the reaction fastest?
504
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554
A violent reaction occurs when a mixture of chromium(III) oxide and aluminium is ignited with a magnesium fuse as shown.
The equation for the reaction is shown.
$$\text{Cr}_2\text{O}_3 + 2\text{Al} \rightarrow 2\text{Cr} + \text{Al}_2\text{O}_3$$
Which substance is oxidised in the reaction?
577
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549
Equations for the effect of water on anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are shown.
$\text{CoCl}_2(s) + 6\text{H}_2\text{O}(l) \rightarrow \text{CoCl}_2 \cdot 6\text{H}_2\text{O}(s)$
$\text{CuSO}_4(s) + 5\text{H}_2\text{O}(l) \rightarrow \text{CuSO}_4 \cdot 5\text{H}_2\text{O}(s)$
Which statement is not correct?
532
571
529
Which statements are properties of an acid?
1. reacts with ammonium sulfate to form ammonia
2. turns red litmus blue
[Table_1]
579
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585
Part of the Periodic Table is shown.
Which element forms an acidic oxide?
589
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582
Salts can be made by adding different substances to dilute hydrochloric acid. For which substance could any excess not be removed by filtration?
589
539
503
A solution containing substance X was tested. The table shows the results.
[Table_1]
What is X?
501
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541
Where in the Periodic Table is the metallic character of the elements greatest?
[Table_1]
584
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551
Which statement about the elements in Group I is correct?
556
591
530
Osmium is a transition element. Which row gives the expected properties of osmium? [Table_1]
510
510
557
Two statements about noble gases are given.
1 Noble gases are reactive, monatomic gases.
2 Noble gases all have full outer shells of electrons.
Which is correct?
566
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592
Some properties of substance X are listed.
● It conducts electricity when molten.
● It has a high melting point.
● It burns in oxygen and the product dissolves in water to give a solution with pH 11.
What is X?
550
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The list shows the order of reactivity of some elements.
K Na Ca Mg Zn Fe (H) Cu
Which statement about the reactivity of these metals is correct?
503
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Iron is obtained from its ore in a blast furnace and is used to make steel.
Iron obtained from the blast furnace is contaminated with ......1...... .
In order to remove this substance, ......2...... is passed through the molten iron.
......3...... is also added to remove oxides of phosphorus and silicon which are ......4...... .
Which words complete the sentences about the conversion of iron to steel?
521
505
548
Copper is a transition element used to make saucepans.
Which property is not correct for copper?
564
560
554
The diagram shows an experiment to investigate how paint affects the rusting of iron.
What happens to the water level in tubes P and Q?
554
579
537
A new planet has been discovered and its atmosphere has been analysed.
The table shows the composition of its atmosphere.
[Table_1]
Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth's atmosphere?
511
576
504
The following substances can be formed when petrol is burnt in a car engine.
Which substance is the main cause of acid rain?
538
573
587
Which statement about methane is not correct?
506
564
577
The formulae of four compounds, W, X, Y, and Z, are given.
[Table_1]
Compound formulas:
W: FeSO₄
X: (NH₄)₃PO₄
Y: KNO₃
Z: NaCl
Which mixture of compounds makes a complete fertiliser?
505
542
574
Which process is used to make lime (calcium oxide) from limestone (calcium carbonate)?
549
542
554
The diagram shows the separation of petroleum into fractions.
What could X, Y, and Z represent?
547
515
501
Which compound does not belong to the same homologous series as the other three compounds?
555
526
563
Which reaction is used as a test for alkenes?
513
561
554
Which statement about ethanol is correct?
509
546
535
Ethene forms an addition polymer as shown.
Which terms describe this polymer?
554
572
596
Liquid W burns completely to give carbon dioxide and water.
Liquid W is a compound containing carbon, hydrogen and oxygen.
A solution of liquid W in water is pH 7.
What is liquid W?
592
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522
