No questions found
The diagram shows how the arrangement of particles changes when a substance changes state.
Which change of state is shown?
592
576
516
Which method can be used to separate a mixture of salt and water to obtain both parts of the mixture?
600
567
589
A student put 25.0 cm$^3$ of dilute hydrochloric acid into a conical flask.
The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture.
Which apparatus does the student need to use to obtain the most accurate results?
537
562
545
Propanone, C_3H_6O, is a liquid at room temperature. What is the boiling point of pure propanone?
574
567
500
Which statement about the boxes P, Q and R is correct?
552
590
524
The number of particles in atoms W, X, Y and Z are shown.
[Table_1: See image]
Which statement is correct?
533
531
531
Which row describes the type of bonding present in substances 1 and 2?
[Table_1]
582
502
550
Substances with giant covalent structures can be used as lubricants and as cutting tools for hard materials.
The diagram shows how the atoms are arranged in two giant covalent substances, X and Y.
Which statement is correct?
543
572
583
The equation shows the thermal decomposition of magnesium carbonate ($M_r = 84$).
$$\text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2$$
Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate are completely decomposed?
562
564
563
Electricity is passed through concentrated aqueous sodium chloride. Inert electrodes are used.
What is formed at the negative electrode?
506
595
595
Two chemical processes are described.
- During the combustion of gasoline, energy is ......1...... .
- During the electrolysis of sulfuric acid, energy is ......2...... .
511
539
581
When dilute sulfuric acid reacts with aqueous sodium hydroxide, the temperature of the solution increases.
Which words describe this reaction?
576
582
561
The mass of a beaker and its contents is plotted against time.
Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid in an open beaker?
530
598
538
When blue copper(II) sulfate is heated, a white solid and water are formed.
The white solid turns blue and gives out heat when water is added to it.
Which terms describe the blue copper(II) sulfate and the reactions?
[Table_1]
510
544
580
Which changes increase the rate of reaction between calcium carbonate and dilute hydrochloric acid?
1. increasing the concentration of the acid
2. increasing the temperature
3. increasing the size of the pieces of calcium carbonate
535
517
546
The equations for two reactions P and Q are given.
P: $2\text{NaNO}_2 + \text{O}_2 \rightarrow 2\text{NaNO}_3$
Q: $2\text{HgO} \rightarrow 2\text{Hg} + \text{O}_2$
In which of these reactions does oxidation of the underlined substance occur?
[Table_1]
597
595
538
What is not a typical characteristic of acids?
516
542
556
Magnesium, phosphorus and chlorine are elements in the same period of the Periodic Table. Which row describes the type of oxide formed by each of these elements?
[Table_1]
516
556
567
Zinc sulfate is made by reacting an excess of zinc oxide with dilute sulfuric acid.
The excess zinc oxide is then removed from the solution.
Which process is used to obtain solid zinc sulfate from the solution?
523
574
561
What is used to test for chlorine?
535
546
545
Which statements about the trends across a period of the Periodic Table are correct?
1. Aluminium is more metallic than sodium.
2. Beryllium is more metallic than carbon.
3. Boron is more metallic than lithium.
4. Magnesium is more metallic than silicon.
513
581
577
Astatine is an element in Group VII of the Periodic Table.
Astatine is ......1...... reactive than iodine.
The melting point of astatine is ......2...... than the melting point of iodine.
Astatine is ......3...... in colour than bromine.
Which words complete gaps 1, 2 and 3?
577
508
588
Which row describes the properties of a typical transition element?
[Table_1]
552
529
538
Why is argon gas used to fill electric lamps?
592
560
545
Which material is not involved in the large-scale extraction of iron from iron ore?
573
586
521
Some reactions of three metals are listed in the table.
[Table_1]
What is the order of reactivity of the metals?
[Table_2]
521
546
513
Which uses of the metals shown are both correct? [Table_1]
525
544
551
The flow chart shows stages in the treatment of river water to produce drinking water.
What occurs at stages X and Y?
533
509
538
Iron is a metal that rusts in the presence of oxygen and water.
Mild steel is used for ......1...... and is prevented from rusting by ......2...... .
Stainless steel does not rust. It is produced by ......3...... iron with another metal.
Which words complete gaps 1, 2 and 3?
[Table_1]
558
539
550
A mixture produces a gas both when it reacts with an acid and when it reacts with an alkali.
Which ions are present in the mixture?
503
580
580
Some marble chips (calcium carbonate) are heated strongly and substances X and Y are formed. Substance X is a white solid that reacts with water, giving out heat. Substance Y is a colourless gas. What are substances X and Y? [Table_1]
553
594
555
The structures of some organic molecules are shown.
Which structures represent an alkane with four carbon atoms?
528
578
552
Some of the fractions obtained from the fractional distillation of petroleum are used as fuels for vehicles.
Which two fractions are used as fuels for vehicles?
556
564
576
Burning fossil fuels releases heat energy.
Which substance is not a fossil fuel?
500
550
564
X, Y and Z are three hydrocarbons.
X $\text{CH}_2{=}\text{CH}_2$ Y $\text{CH}_3{−}\text{CH}{=}\text{CH}_2$ Z $\text{CH}_3{−}\text{CH}_2{−}\text{CH}{=}\text{CH}_2$
What do compounds X, Y and Z have in common?
1 They are all alkenes.
2 They are all part of the same homologous series.
3 They all have the same boiling point.
508
519
574
The table shows bonds that are present and bonds that are not present in compound X.
[Table_1]
What type of compound is X?
517
509
556
The diagram shows a reaction sequence.
Which row names the processes X, Y and Z?
539
600
534
Molecules of a substance react together as shown.
Which type of reaction has taken place?
530
556
505
