No questions found
The apparatus shown is set up. After 20 minutes a white ring of ammonium chloride is seen at position Y.
Which statement about the molecules of ammonia and hydrogen chloride is correct?
521
527
568
A student measures 25.00 cm3 of dilute hydrochloric acid accurately.
Which apparatus is most suitable?
524
545
546
The chromatogram of solutions of two metal ions, P and Q, is shown.
P is coloured. A locating agent is used to find the position of Q.
The $R_f$ value of each solution is calculated.
P is a .....,1...... element and has an $R_f$ value ......2...... than that of Q.
Which words complete gaps 1 and 2?
515
561
522
Which row describes the formation of single covalent bonds in methane?
536
589
549
Which statement describes the structure of an ionic compound?
593
573
547
Calcium metal reacts with water to form a solution of calcium hydroxide and hydrogen gas. Which equation is correct?
524
557
595
25.0 cm$^3$ of 0.100 mol/dm$^3$ aqueous sodium hydroxide is neutralised by 24.6 cm$^3$ of dilute sulfuric acid.
What is the concentration of the dilute sulfuric acid?
536
514
503
The diagram shows the electrolysis of an aqueous solution of X using inert electrodes.
Hydrogen is produced at the cathode and chlorine is produced at the anode.
What is X?
517
544
532
Aluminium is extracted by electrolysis as shown.
Which row shows the ionic half-equations at the cathode and the anode? [Table_1]
505
555
589
Fuel cells are used as energy sources in cars.
Which row gives a fuel used in a fuel cell and the products formed?
[Table 1]
591
562
535
Two elements, X and Y, react together to form a covalent molecule as shown. The reaction is exothermic. $\text{X}_2(g) + \text{Y}_2(g) \rightarrow 2\text{XY}(g)$ The bond energies are shown in the table. [Table_1] The bond energies are: - X–X: 436 kJ/mol - Y–Y: 242 kJ/mol - X–Y: 431 kJ/mol What is the energy change for the reaction?
588
572
532
Which change in reaction conditions increases both the collision rate and the proportion of molecules with sufficient energy to react?
583
506
522
When blue-green crystals of nickel(II) sulfate are heated, water is produced and a yellow solid remains. When water is added to the yellow solid, the blue-green colour returns. Which process describes these changes?
505
509
524
The equation for the manufacture of ethanol is shown.
$\text{C}_2\text{H}_4 \text{(g)} + \text{H}_2\text{O} \text{(g)} \rightleftharpoons \text{C}_2\text{H}_5\text{OH} \text{(g)}$
ethene steam ethanol
What is the effect of doubling the pressure on this reaction?
579
525
518
The ionic equation for the reaction of aqueous potassium bromide with chlorine gas is shown.
$$2Br^- + Cl_2 \rightarrow Br_2 + 2Cl^-$$
Which statement is correct?
599
540
503
Which type of oxide are carbon monoxide and aluminium oxide? [Table_1]
568
539
519
The positions of elements W, X, Y, and Z in the Periodic Table are shown.
Which elements form basic oxides?
550
587
572
Which row shows the difference between a weak acid and a strong acid?
[Table below]
| | weak acid | strong acid |
|---|---|---|
| A | fully ionised | partially ionised |
| B | concentrated | dilute |
| C | dilute | concentrated |
| D | partially ionised | fully ionised |
501
600
518
Part of the Periodic Table is shown:
Which row describes the properties of X, Y and Z?
540
530
569
The melting points and boiling points of the elements of Group I of the Periodic Table are shown.
[Table_1]
Which pair of elements are liquid at 800°C?
564
537
587
The electronic structures of helium, neon and argon are shown.
Which row describes these gases? [Table_1]
534
568
506
The diagrams show the structure of two substances used to make electrical conductors.
Which statement correctly describes X and Y?
590
541
533
A student heated the carbonates and nitrates of sodium and copper.
The results are shown.
[Table_1]
Which rows describe the correct results?
528
527
536
Zinc is extracted from its ore, zinc blende, using two chemical reactions.
1 $2\text{ZnS} + 3\text{O}_2 \rightarrow 2\text{ZnO} + 2\text{SO}_2$
2 $2\text{ZnO} + \text{C} \rightarrow 2\text{Zn} + \text{CO}_2$
Which substance is reduced in reactions 1 and 2?
527
543
595
Four metals, zinc, M, copper, and magnesium, are reacted with aqueous solutions of their nitrates. The results are shown.
[Table_1]
What is the order of reactivity of these four metals starting with the most reactive?
582
555
533
Which property of aluminium makes it useful in the manufacture of aircraft?
586
569
562
The exhaust gases from cars contain oxides of nitrogen. How are these oxides of nitrogen formed?
517
513
600
Water can be treated by filtration then chlorination.
Which uses do not need water of this quality?
1 water for cooling in industry
2 water for washing clothes
3 water for drinking
505
516
538
Some of the processes involved in the carbon cycle are shown.
1. glucose + oxygen \rightarrow carbon dioxide + water
2. carbon dioxide + water \rightarrow glucose + oxygen
3. methane + oxygen \rightarrow carbon dioxide + water
What are the names of these processes?
[Table_1]
556
558
556
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?
591
542
513
Ammonia is produced in the Haber process. The equation for the reaction is shown.
$$3\text{H}_2(g) + \text{N}_2(g) \rightleftharpoons 2\text{NH}_3(g)$$
The forward reaction is exothermic.
Which conditions of temperature and pressure produce the highest yield of ammonia?
[Table_1: Contains temperature and pressure options]
589
580
578
Which row shows the conditions used in the Contact process?
[Table_1]
527
594
582
The diagram represents a lime kiln used to heat limestone to a very high temperature.
What leaves the kiln at X?
553
576
555
Which fuel could be gasoline?
[Image_1: A flowchart showing the decision process]
Is it obtained from petroleum?
- yes
- no
Is it used as fuel for cars?
- yes
- no
580
546
510
Which statement about homologous series is not correct?
578
543
519
In bright sunlight, ethane and chlorine combine in substitution reactions.
Which compound is not formed in these reactions?
566
516
576
What are the properties of aqueous ethanoic acid?
[Table_1]
537
572
536
The structures of four molecules are shown.
Which molecules react together to form the ester propyl methanoate?
597
524
508
But-1-ene has the structure CH$_3$CH$_2$CH=CH$_2$.
What is the structure of poly(but-1-ene)?
568
506
549
