No questions found
Which change of state takes place during evaporation?
540
574
583
The diagram shows apparatus being used to demonstrate how the rate of a chemical reaction changes with temperature. Which statement must be correct?
510
522
551
The table shows the nucleon number and the number of neutrons in one atom of isotopes W, X, Y, and Z.
[Table_1]
Which statement about W, X, Y, and Z is correct?
522
525
521
Compound X melts at 801°C and is a good electrical conductor when dissolved in water. Compound Y boils at 77°C, is insoluble in water and is a non-conductor of electricity. Which type of bonding is present in X and in Y? [Table_1]
521
566
501
What do the nuclei of $^1H$ hydrogen atoms contain?
535
590
576
The electronic structures of atoms X and Y are shown.
X and Y form a covalent compound.
What is its formula?
572
572
533
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?
567
522
594
The diagram shows the electrolysis of concentrated hydrochloric acid and concentrated aqueous sodium chloride using carbon electrodes.
At which electrode(s) is hydrogen produced?
600
555
585
The diagram shows a section of an overhead power cable.
Which statement explains why a particular substance is used?
575
597
511
Hydrogen can be used as a fuel. Which properties of hydrogen would be advantages and which would be disadvantages?
1. Hydrogen is expensive to produce.
2. Hydrogen reacts exothermically with oxygen.
3. When hydrogen burns, a greenhouse gas is not formed.
[Table_1]
538
582
512
Which row correctly describes whether the reaction is exothermic or endothermic? [Table_1]
528
521
500
The diagram shows four experiments in which equal volumes of aqueous acid (all in an excess) are added to equal masses of metal. Both acids have the same concentration. In which experiment has the metal completely reacted in the shortest time?
512
537
566
The element vanadium, V, forms several oxides. In which change is oxidation taking place?
510
513
582
Which reaction is not a reversible reaction?
513
518
582
The reaction between magnesium and carbon dioxide is represented by the following equation.
$$2\text{Mg} + \text{CO}_2 \rightarrow 2\text{MgO} + \text{C}$$
Which statement describes what happens in this reaction?
563
595
529
Which property is not characteristic of a base?
551
574
551
A sting from insect X has a pH of 6 and a sting from insect Y has a pH of 8.
The table shows the pH of four substances.
[Table_1]
Which substances are used to treat the two stings?
[Table_2]
530
577
518
A salt is produced in each of the following reactions.
P magnesium + dilute hydrochloric acid
Q zinc oxide + dilute sulfuric acid
R sodium hydroxide + dilute hydrochloric acid
S copper carbonate + dilute sulfuric acid
Which statements about the products of the reactions are correct?
1 A flammable gas is produced in reaction P.
2 Water is formed in all reactions.
3 All the salts formed are soluble in water.
532
516
585
The table shows the symbols of three metals with names that begin with the letter C.
Which row correctly shows the melting point of the metals?
[Table_1]
524
585
517
The table gives information about four elements. Which element is a transition metal?
[Table_1]
The table lists elements with their electrical conductivity, density in $g/cm^3$, and melting point in °C.
A. electrical conductivity: good, density: 0.97, melting point: 98°C
B. electrical conductivity: good, density: 7.86, melting point: 1535°C
C. electrical conductivity: poor, density: 2.33, melting point: 1410°C
D. electrical conductivity: poor, density: 3.12, melting point: -7°C
518
535
506
The diagram shows elements W, X, Y and Z in a section of the Periodic Table.
Which statement about the reactivity of the elements is correct?
566
542
512
The diagrams show what happens when three different metals are added to water.
What are X, Y and Z?
575
549
573
Which substances do not react together?
525
511
587
Iron is extracted from hematite in a blast furnace.
Which reaction increases the temperature in the blast furnace to over 1500°C?
508
530
541
Which statements about water are correct?
1. Household water may contain salts in solution.
2. Water for household use is filtered to remove soluble impurities.
3. Water is treated with chlorine to kill bacteria.
4. Water is used in industry for cooling.
572
528
583
Carbon monoxide is an air pollutant produced when petrol is burned in a car engine. Why is carbon monoxide considered to be an air pollutant?
528
594
598
Metals are welded by using the heat produced by burning a gas in oxygen.
Which gas could not be used for this purpose?
551
577
505
Which elements are present in NPK fertilisers?
510
532
578
The apparatus shown is set up and left for a week.
Which diagram shows the level of the water at the end of the week?
578
547
567
A farmer moves his cows into a concrete shelter for protection. There is little access for fresh air once the door is closed. Which gases would increase in amount in the shelter?
544
585
570
A student is asked to draw a diagram showing the uses of limestone.
[Image_1: Diagram showing limestone uses with connections labeled 1, 2, and 3 indicating paths to 'making cement', 'making lime', and 'added, with hematite, to a blast furnace']
Which numbered lines show a correct use of limestone?
553
505
574
Which row describes the formation of a polymer?
[Table_1]
595
588
554
Hydrocarbons obtained by fractional distillation of petroleum can be cracked to make useful products.
Which substance could not be obtained by cracking propane, $M_r 44$?
522
560
562
Ethanol can be formed by
1. fermentation
2. reaction between steam and ethene
Which of these processes uses a catalyst? [Table_1]
536
576
533
The flow chart shows the preparation of ethanol and some important chemistry of ethanol.
What are X, Y and Z?
588
581
509
What are the properties of a dilute solution of ethanoic acid? [Table_1]
503
583
549
