No questions found
Which gas has the slowest rate of diffusion?
580
505
593
A mixture of colourless amino acids is separated using chromatography.
The solvent used is propanol.
The chromatogram is sprayed with a locating agent.
Which row describes the purpose of the propanol and the locating agent?
590
517
585
Which piece of apparatus can only measure a single fixed volume?
557
505
555
In the chromatography experiment shown, which label represents the solvent front?
519
512
540
The atomic structure of four particles are shown.
[Table_1]
Which particles have the same chemical properties?
507
536
543
The arrangements of the electrons in two ions formed from elements X and Y are shown.
Which equation represents the reaction between elements X and Y?
554
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578
Which diagram shows the outer shell electron arrangement in a molecule of methanol, $\text{CH}_3\text{OH}$?
566
527
549
Which statement about silicon dioxide, $SiO_2$, is correct?
539
546
554
Rubidium is in Group I of the Periodic Table and bromine is in Group VII.
Rubidium reacts with bromine to form an ionic compound.
Which row shows the electron change taking place for rubidium and the correct formula of the rubidium ion?
[Table_1]
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571
Which statement explains why graphite is used as a lubricant?
542
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548
Sodium carbonate reacts with sulfuric acid to form carbon dioxide, water and a sodium salt.
An incomplete equation for the reaction is shown.
$\text{Na}_2\text{CO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{..................}$
What is the formula of the sodium salt?
509
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553
The relative atomic mass of chlorine is 35.5.
When calculating relative atomic mass, which particle is the mass of a chlorine atom compared to?
510
595
539
What is the empirical formula of an oxide of iron, formed by reacting 2.24 g of iron with 0.96 g of oxygen?
595
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516
Which reaction takes place at the cathode during the electrolysis of molten nickel(II) chloride?
598
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592
Sodium nitrate is added to water in a beaker and stirred until it dissolves. At the end of the experiment, the beaker feels cold. Which row describes the reaction? [Table_1]
522
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554
Which substance does not require oxygen in order to produce energy?
553
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Ethenereacts with hydrogen to form ethane.
The bond energies are shown in the table.
[Table_1]
What is the energy change for the reaction?
557
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510
A sign displayed in a flour mill is shown:
Which statement explains why there is a danger of explosion in a flour mill?
536
533
558
A student investigates the effect of concentration on the rate of reaction between calcium carbonate and hydrochloric acid. He follows the method shown.
• Place 1g of calcium carbonate in a conical flask.
• Add excess hydrochloric acid.
• Let the reaction continue until no more gas is made.
• Repeat the experiment with different concentrations of hydrochloric acid.
Which essential step has been left out of the method if he is to work out the rate of the reaction?
523
568
550
The reaction between sulfur dioxide and oxygen is shown.
$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$
The reaction is exothermic. Which of the changes shifts the position of equilibrium to the right?
1. Increase the concentration of oxygen.
2. Increase the pressure.
3. Increase the temperature.
547
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508
The reaction between chlorine and bromide ions is a redox reaction.
$$\text{Cl}_2 + 2\text{Br}^- \rightarrow 2\text{Cl}^- + \text{Br}_2$$
What is the change in oxidation state of the reducing agent in this reaction?
518
538
564
Zinc oxide is an amphoteric oxide.
Which row describes the reactions of zinc oxide?
[Table depicting reactions of zinc oxide]
533
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537
A student carries out an experiment to prepare pure magnesium sulfate crystals.
The diagram shows the first stage of the preparation.
He adds magnesium carbonate until no more reacts.
Which process should he use for the next stage?
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582
Elements P and Q have the same number of electron shells.
Q has more electrons in its outer shell than P.
Which statements are correct?
1. P and Q are in the same group of the Periodic Table.
2. P and Q are in the same period of the Periodic Table.
3. P has a greater tendency to form positive ions than Q.
4. The oxides of Q are more basic than those of P.
541
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The positions of four elements in the Periodic Table are shown:
Which element is a gas that displaces iodine from sodium iodide?
548
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A flammable gas needs to be removed from a tank at an industrial plant. For safety reasons, an inert gas is used.
Which gas is suitable?
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A strip of aluminium is placed into a test-tube containing aqueous lead(II) nitrate and left for several minutes. Aluminium is higher than lead in the reactivity series.
Which statement explains why lead is not displaced by this strip of aluminium?
525
540
598
Which statements about the metal zinc are correct?
1. It is extracted from the ore bauxite.
2. It is used to galvanise steel.
3. It is used to make the alloy brass.
4. It reacts with dilute hydrochloric acid to produce hydrogen gas.
505
598
551
What is the symbol of the metal used in the manufacture of aircraft because of its strength and low density?
573
584
512
Ammonia is manufactured using the Haber process. Which statement about this process is correct?
520
597
502
Iron can be protected from rusting by attaching a piece of a more reactive metal, e.g. magnesium, to the iron.
Which equation represents the reaction that takes place?
502
543
571
Which row describes two uses of sulfur dioxide? [Table_1]
600
598
600
Part of the carbon cycle is shown.
What are processes P, Q and R?
549
561
530
The structures of four organic molecules are shown. Which molecules are structural isomers of structure 1?
504
562
521
Which chemical equation for the substitution of an alkane with chlorine is correct?
574
501
564
Propene is an alkene that reacts with bromine, steam and hydrogen as shown.
What are the products of these reactions?
573
567
537
The flow chart shows the preparation of ethanol and some important chemistry of ethanol.
What are X, Y and Z?
560
537
595
Which statements about aqueous ethanoic acid are correct?
1. It is an alkane.
2. It reacts with sodium carbonate to form carbon dioxide.
3. It changes the colour of litmus solution from blue to red.
4. It is a hydrocarbon.
518
579
570
The structure of a polymer is shown.
Which monomer forms this polymer?
550
566
580
