No questions found
'Particles moving very slowly from an area of higher concentration to an area of lower concentration.'
Which process is being described?
595
563
519
A student mixes 25 cm3 samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide. In each case, the student measures the change in temperature to test if the reaction is exothermic.
Which piece of apparatus is not needed?
[Image_1: A. burette, B. clock, C. pipette, D. thermometer]
599
520
598
A sample contains a mixture of powdered limestone (calcium carbonate), sugar and wax. What is the correct way to obtain a pure sample of sugar?
589
593
560
The table shows information about four different particles.
What are the values of W, X, Y and Z?
551
551
597
Which pair of statements about diamond and graphite is correct? [Image_1: Structures of diamond and graphite]
505
580
592
Which row shows the electronic structure of the sodium ion and the chloride ion in sodium chloride?
[Table_1]
580
551
541
A molecule of X contains two bromine atoms, three carbon atoms, six hydrogen atoms and one oxygen atom. What is the formula of X?
528
549
530
The diagram shows the electrolysis of concentrated aqueous sodium chloride using inert electrodes.
Which substances are produced at the electrodes?
575
501
511
Which apparatus could be used to electroplate an iron nail with copper?
520
521
561
Which experiment is the most exothermic?
[Table_1: initial temperature /°C and final temperature /°C]
564
542
586
Which substance is \textit{not} used as a fuel?
532
565
558
Zinc granules are reacted with excess dilute hydrochloric acid.
The volume of hydrogen given off is measured at different times.
The results are shown on the graph, labelled experiment 1.
The results for a second experiment are also shown on the graph, labelled experiment 2.
Which change to the conditions was made in experiment 2?
507
543
524
When green crystals of nickel(II) sulfate are heated, water is given off and a yellow solid remains. When water is added to the yellow solid, the green colour returns.
Which process describes these changes?
512
590
563
In which reaction is the copper compound reduced?
A. $\text{CuCO}_3 \rightarrow \text{CuO} + \text{CO}_2$
B. $\text{CuO} + \text{H}_2\text{SO}_4 \rightarrow \text{CuSO}_4 + \text{H}_2\text{O}$
C. $\text{CuSO}_4 + 2\text{NaOH} \rightarrow \text{Cu}( ext{OH})_2 + \text{Na}_2\text{SO}_4$
D. $2\text{CuO} + \text{C} \rightarrow 2\text{Cu} + \text{CO}_2$
576
547
535
The element selenium forms the oxide $\text{SeO}_2$. This oxide dissolves in concentrated aqueous sodium hydroxide.
The element zirconium forms the oxide $\text{ZrO}_2$. This oxide dissolves in concentrated sulfuric acid.
How are the elements selenium and zirconium classified?
[Table_1]
556
515
596
Aqueous sodium hydroxide was added slowly, until in excess, to separate solutions of W, X, Y, and Z.
The results are shown.
[Table_1]
Which row identifies the metal ions in the solutions?
574
528
584
Acids can react with metal oxides, carbonates and metals. Which reactions produce a gas?
[Table_1: Acids with different compounds]
535
533
500
The apparatus shown is used to prepare aqueous copper(II) sulfate.
What are X and Y?
576
599
565
Part of the Periodic Table is shown:
Which statement about the elements is correct?
525
539
526
What is not a property of Group I metals?
557
538
552
Which element is a transition element? [Table_1]
552
585
518
Which statement about the elements in Group VII is not correct?
581
545
541
Four metals are listed in decreasing order of reactivity.
magnesium
zinc
iron
copper
Titanium reacts with acid and cannot be extracted from its ore by heating with carbon.
Where should titanium be placed in the list?
586
500
579
Impurities in iron obtained from the blast furnace include carbon, phosphorus and silicon.
Which impurities are removed from the molten iron as gases when it is made into steel?
529
534
548
A student added dilute hydrochloric acid to four metals and recorded the results. Some of the results are not correct.
[Table_1]
Which two results are correct?
582
554
540
River water contains soluble impurities, insoluble impurities and bacteria.
River water is made safe to drink by filtration and chlorination.
Which statement is correct?
531
533
553
Air is a mixture of gases.
Which gas is present in the largest amount?
576
552
514
Which information about carbon dioxide and methane is correct? [Table_1]
538
581
571
Aqueous sodium hydroxide is added to a sample of a fertiliser and the mixture warmed.
Ammonia gas is given off.
Which ion does the fertiliser contain?
535
567
599
Which reaction would not result in the production of carbon dioxide?
594
537
537
Which substance gives off carbon dioxide on heating?
504
583
527
Petroleum is separated into fractions. Which statement is not correct?
547
547
569
Butane reacts as shown.
butane \(\xrightarrow{\text{catalyst and heat}}\) butene + hydrogen
What is this type of reaction?
562
554
521
Which compound is not a member of the alkene homologous series?
572
560
561
Which compound decolourises aqueous bromine?
597
535
546
The equation represents the fermentation of X.
X \overset{yeast}{\longrightarrow} ethanol + carbon dioxide
What is X?
591
518
550
Which equation for the complete combustion of ethanol is correct?
506
575
553
