No questions found
A gas is released at point P in the apparatus shown.
Which gas turns the damp universal indicator paper red most quickly?
509
552
585
A 1 cm$^3$ sample of substance X is taken. This is sample 1.
X is then converted to a different physical state and a 1 cm$^3$ sample is taken. This is sample 2.
Sample 2 contains more particles in the 1 cm$^3$ than sample 1.
Which process caused this increase in the number of particles in 1 cm$^3$?
574
593
581
Which statement about paper chromatography is correct?
578
537
514
Element X has 7 protons.
Element Y has 8 more protons than X.
Which statement about element Y is correct?
575
543
503
A covalent molecule Q contains only six shared electrons. What is Q?
575
500
529
Which statement explains why metals are malleable?
553
572
595
Which statement about isotopes of the same element is correct?
567
547
535
The element silicon has the same structure as diamond.
Which statement about silicon is correct?
509
558
546
Three ionic compounds of vanadium have the formulae $V_2O$, $VCl_2$ and $V_2O_3$.
What is the charge on the vanadium ion in each compound?
[Table_1]
558
547
580
In separate experiments, electricity was passed through concentrated aqueous sodium chloride and molten lead(II) bromide.
What would happen in both experiments?
545
538
582
The equation for the decomposition of calcium carbonate is shown.
$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$
What mass of calcium oxide is produced when 10 g of calcium carbonate is heated?
511
578
594
Gas syringe X contains 100 cm3 of hydrogen bromide gas, HBr.
Gas syringe Y contains 100 cm3 of carbon dioxide gas. The volume of each gas is measured at room temperature and pressure.
Which statement is correct?
503
551
543
Which simple cell produces the most electrical energy?
582
550
559
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]
594
596
583
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?
540
581
538
An example of a redox reaction is shown.
Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu
Which statement about the reaction is correct?
524
564
543
The equation for the decomposition of hydrogen iodide is shown.
$2HI \rightarrow H_2 + I_2$
Some bond energies are shown.
[Table_1]
What is the energy change for the reaction?
506
538
550
Element X forms an oxide, XO, that neutralises sulfuric acid.
Which row describes X and XO?
[Table_1]
525
536
591
Aqueous solutions of sodium sulfate and barium chloride are mixed.
$$\text{Na}_2\text{SO}_4(\text{aq}) + \text{BaCl}_2(\text{aq}) \rightarrow \text{BaSO}_4(\text{s}) + 2\text{NaCl}(\text{aq})$$
Which process is used to separate a sample of barium sulfate from the reaction mixture?
545
507
552
Information about element J is shown.
• Its atoms have four electrons in their outer shell.
• It is a non-metal.
• Its oxide has a macromolecular structure.
• It has a high melting point.
What is J?
533
598
531
Which property is shown by transition elements?
590
527
590
Helium and neon exist as monoatomic gases at room temperature and pressure.
statement 1 Helium and neon have eight electrons in their outer shell.
statement 2 Helium and neon are unreactive.
Which option is correct?
535
510
545
What are possible effects of an inadequate water supply during a drought?
1. crop failure
2. wastage of water
3. human disease
4. death of farm animals
536
503
534
Which statement explains why galvanising prevents iron from rusting?
574
542
561
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?
506
570
508
Which compounds are released by the extraction of zinc from zinc blende and by respiration?
[Table_1]
554
541
557
Which gas is an air pollutant that causes acid rain?
520
572
566
Ammonia is made from nitrogen and hydrogen. The equation for the reaction is shown.
$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$
The forward reaction is exothermic.
Which conditions give the greatest equilibrium yield of ammonia?
[Table_1]
502
583
596
Which reaction does not occur during the extraction of iron from hematite in a blast furnace?
548
524
516
Which substance is used as a catalyst in the manufacture of sulfuric acid by the Contact process?
505
517
538
Metal X is a good conductor of electricity and is used for electrical wiring.
Metal Y is used to make an alloy which is resistant to corrosion and is used to make cutlery.
Metal Z is light and strong and is used in the manufacture of aircraft.
What are X, Y and Z?
[Table_1]
569
545
564
The formulae of two compounds of manganese are MnO$_2$ and KMnO$_4$.
In these two compounds the oxidation state of potassium is +1 and the oxidation state of oxygen is –2.
What are the oxidation states of manganese in each of these two compounds?
539
512
575
Which statement about calcium carbonate is correct?
573
568
571
Ethanol is reacted with acidified potassium manganate (VII). Which row describes the type of reaction and the type of organic compound formed? [Table_1]
524
537
503
The diagrams show the structural formulae of four compounds.
Which two compounds are structural isomers?
588
548
520
Which statement about alkanes is correct?
592
579
554
How much hydrogen is needed to react completely with 0.02 moles of butene to make butane?
563
530
557
What is an advantage of the fermentation process for producing ethanol compared with the catalytic addition of steam to ethene?
517
530
599
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?
521
572
542
