No questions found
Substances change state when their temperature is changed. Which changes of state take place when the temperature of a substance is lowered?
523
547
548
A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm$^3$ of dilute sulfuric acid.
Which apparatus is essential to complete the experiment?
1 stop-clock
2 measuring cylinder
3 thermometer
4 balance
563
556
525
Which method is used to separate a mixture of the following liquids?
[Table_1]
577
510
564
X and Y are two different elements.
X and Y have the same number of nucleons.
Which statement about X and Y is correct?
596
534
568
Which row identifies an alloy, a pure metal and a non-metal? [Table_1]
541
515
577
Which statement about ions and ionic bonding is correct?
521
504
517
Which dot-and-cross diagram shows the arrangement of outer shell electrons in a molecule of hydrogen chloride?
523
550
572
Which statement explains why graphite can be used as a lubricant?
567
513
532
A compound of element X has the formula $X_2O$ and a relative formula mass of 144. What is element X?
552
530
585
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.
At which electrodes is hydrogen produced?
593
588
585
Which type of reaction occurs when calcium carbonate is heated at a high temperature to produce calcium oxide and carbon dioxide?
554
543
552
Which row identifies a chemical change and a physical change?
[Table_1]
573
517
561
Which statement about rate of reaction is correct?
549
559
595
Some common household substances are tested with litmus and methyl orange.
[Table_1]
Which statement is correct?
578
533
512
Water is added to anhydrous copper(II) sulfate. What happens during the reaction?
562
536
574
In which equation is carbon both oxidised and reduced?
545
585
543
Aqueous solutions containing copper(II) ions can be identified using flame tests and by adding aqueous sodium hydroxide. Which row describes what is observed in these tests?
[Table_1]
578
556
553
The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested.
[Table_1]
Which information about X and Y is correct?
[Table_2]
577
555
574
An acid is neutralised by adding an excess of an insoluble solid base.
A soluble salt is formed.
How is the pure salt obtained from the reaction mixture?
551
544
594
Some statements about gas G are listed.
G is monoatomic.
G is found in clean, dry air.
G is used in lamps.
Which element is G?
578
587
557
Part of the Periodic Table is shown. Which element is a metal?
518
508
577
The elements sodium to argon form Period 3 of the Periodic Table. Which row describes the trend across Period 3 from left to right? [Table_1]
539
500
506
Some properties of element E are listed.
It has a high density.
It has a high melting point.
What is E?
534
520
510
Lithium, sodium and potassium are elements in Group I of the Periodic Table.
Chlorine, bromine and iodine are elements in Group VII of the Periodic Table.
Which row identifies the least dense of these elements in each group?
[Table_1]
579
590
516
The reactions of metals P, Q, R and S are shown.
[Table_1]
What is the order of reactivity of the metals?
533
585
564
Iron is extracted from hematite in the blast furnace at a temperature of about 1550°C.
Which equation shows the main reaction that increases the temperature in the furnace?
528
570
597
Which diagram represents the arrangement of atoms in an alloy?
575
552
544
Which uses of the metals shown are correct? [Table_1]
515
556
530
Which row identifies a substance present in clean air and a substance that is a pollutant in air?
[Table_1]
550
575
582
Which property of sulfur dioxide explains why it is used as a food preservative?
508
570
566
Fertilisers are used to provide three of the elements needed for plant growth. Which two compounds would give a fertiliser containing all three of these elements?
502
533
550
Compound J is an unsaturated carboxylic acid.
Which bonds are present in a molecule of J?
[Table_1]
513
535
595
Petroleum is separated into useful fractions by fractional distillation. Which fraction is used as a fuel for jet aeroplanes?
584
544
564
What are the products when limestone (calcium carbonate) is heated strongly?
543
571
570
Ethene reacts with substance X to form ethanol.
What is X?
595
562
581
What is the equation for the complete combustion of methane?
532
554
528
Alkenes can be produced by cracking large hydrocarbon molecules to form smaller hydrocarbon molecules.
Which equations represent possible reactions when tetradecane, $C_{14}H_{30}$, is cracked?
1. $C_{14}H_{30} \rightarrow C_{2}H_{6} + C_{3}H_{6} + C_{4}H_{8} + C_{5}H_{10}$
2. $C_{14}H_{30} \rightarrow H_{2} + C_{2}H_{4} + C_{3}H_{6} + C_{4}H_{8} + C_{5}H_{10}$
3. $C_{14}H_{30} \rightarrow C_{2}H_{6} + 4C_{3}H_{6}$
4. $C_{14}H_{30} \rightarrow C_{2}H_{6} + C_{3}H_{8} + C_{9}H_{18}$
532
550
550
The products formed by burning substance J are passed through the apparatus shown.
What is substance J?
581
518
519
Which statements about ethanoic acid are correct?
1. Aqueous ethanoic acid reacts with magnesium to form magnesium ethanoate.
2. Carbon dioxide is formed when aqueous ethanoic acid reacts with sodium carbonate.
3. Hydrogen is formed when aqueous ethanoic acid reacts with sodium hydroxide.
4. Ethanoic acid turns red litmus paper blue.
565
542
518
