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A gas is released at point P in the apparatus shown. Which gas turns the damp universal indicator paper red most quickly?
593
559
587
A mixture is separated using the apparatus shown.
What is the mixture?
591
558
514
Which statement about paper chromatography is correct?
533
576
500
Element X has 7 protons.
Element Y has 8 more protons than X.
Which statement about element Y is correct?
599
568
582
A covalent molecule Q contains only six shared electrons.
What is Q?
515
518
539
The arrangement of particles in each of two solids, S and T, are shown.
What are S and T?
563
553
542
Two elements, P and Q, are in the same period of the Periodic Table.
P and Q react together to form an ionic compound. Part of the lattice of this compound is shown.
Which statement is correct?
525
578
520
2.56 g of a metal oxide, MO_2, is reduced to 1.92 g of the metal, M.
What is the relative atomic mass of M?
504
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502
In separate experiments, electricity was passed through concentrated aqueous sodium chloride and molten lead(II) bromide.
What would happen in both experiments?
520
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502
What is the ionic half-equation for the reaction that occurs at the cathode when molten lead(II) bromide is electrolysed?
519
561
548
The complete combustion of propane is exothermic.
The equation for this reaction is shown.
$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$
Which energy level diagram represents the complete combustion of propane?
567
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573
Which equation represents a reaction that takes place in a fuel cell?
550
517
505
When sulfur is heated it undergoes a ......1...... change as it melts. Further heating causes the sulfur to undergo a ......2...... change and form sulfur dioxide. Which words complete gaps 1 and 2? [Table_1]
574
519
591
Four statements about the effect of increasing temperature on a reaction are shown.
1 The activation energy becomes lower.
2 The particles move faster.
3 There are more collisions between reacting particles per second.
4 There are more collisions which have energy greater than the activation energy.
Which statements are correct?
560
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556
An example of a redox reaction is shown.
$\text{Zn} + \text{Cu}^{2+} \rightarrow \text{Zn}^{2+} + \text{Cu}$
Which statement about the reaction is correct?
558
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555
Which statement about a reaction in equilibrium is correct?
537
511
507
Element X forms an oxide, XO, that neutralises sulfuric acid.
Which row describes X and XO?
[Table_1]
505
512
571
Copper(II) sulfate is prepared by adding excess copper(II) oxide to warm dilute sulfuric acid. Which purification methods are used to obtain pure solid copper(II) sulfate from the reaction mixture?
573
502
577
Some reactions of element M are shown.
What is element M?
552
552
594
In which equation is the underlined reactant acting as a base?
581
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579
Which elements in the table are transition elements?
[Table_1]
518
536
558
Element R forms a covalent compound $R_2$Si with silicon. Which row describes R? [Table_1]
551
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556
Some properties of metal J are listed.
● J does not react with cold water.
● J reacts with dilute hydrochloric acid.
● No reaction occurs when the oxide of J is heated with carbon.
What is J?
514
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532
Some metal nitrates and carbonates decompose when heated strongly.
Metal Q has a nitrate that decomposes to give a salt and a colourless gas only.
The carbonate of metal Q does not decompose when heated with a Bunsen burner.
What is metal Q?
573
527
507
Which substances are used in the extraction of aluminium?
540
539
593
Different types of steel alloys are manufactured by changing the percentage of carbon in the alloy.
The properties of four steel alloys are shown.
[Table_1]
What are the properties of the steel alloy containing 0.23\% of carbon?
567
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521
Ammonia is made by reacting nitrogen with hydrogen in the Haber process.
The equation for the process is shown.
[Image_1: N_2 + 3H_2 ⇌ 2NH_3]
Which changes in reaction conditions would produce a greater yield of ammonia?
1. adding more iron catalyst
2. increasing the reaction pressure
3. increasing the particle size of the iron catalyst
531
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576
Which process removes carbon dioxide from the atmosphere?
545
596
537
Which catalyst is used in the Contact process?
530
567
537
A white solid Z reacts with dilute hydrochloric acid to produce a gas. The same gas is produced when compound Z is heated strongly. What is Z?
578
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566
Compound Z contains carbon, hydrogen and oxygen.
Molecules of compound Z have four hydrogen atoms and two carbon atoms.
Compound Z can be made by oxidation of an alcohol.
What is compound Z?
526
513
564
Which statement about homologous series and isomerism is correct?
513
551
583
Which statement about alkanes is correct?
571
583
527
What is an advantage of manufacturing ethanol by fermentation?
593
542
596
P, Q, R and S are four organic compounds.
P is an unsaturated hydrocarbon.
Q burns but otherwise is unreactive.
R contains a C–C single bond and a C=C double bond.
S undergoes addition polymerisation.
Which compounds are alkenes?
590
558
573
The structure of a synthetic polymer is shown.
The structure shows that it is a ......1...... . It is formed by ......2...... polymerisation.
Which words complete gaps 1 and 2?
580
510
511
