No questions found
The diagram shows a cup of hot tea.
Which row describes the water particles in the air above the cup compared with the water particles in the cup? [Table_1]
599
547
575
A student is asked to measure the time taken for 0.4 g of magnesium carbonate to react completely with 25.0 cm3 of dilute hydrochloric acid. Which pieces of apparatus does the student need?
550
576
576
Petroleum is a mixture.
Which method is used to separate petroleum?
523
550
549
Magnesium hydroxide can be obtained from sea water as shown.
Which process is used in the separation stage to separate solid magnesium hydroxide from the mixture?
541
581
590
What is the total number of electrons in one molecule of ammonia, NH$_3$?
581
577
507
An isotope of lithium has the symbol $_{3}^{7}\text{Li}$.
What is the arrangement of electrons in one atom of this isotope of lithium?
559
508
560
Graphite is a form of carbon.
Why can graphite be used as a lubricant?
517
574
521
Magnesium burns in oxygen to form magnesium oxide.
The equation for the reaction is shown.
$2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}$
Which mass of magnesium oxide is formed when 48 g of magnesium is burned?
585
530
575
The apparatus used for electrolysis is shown.
Which statement is correct?
564
512
519
The temperature of the water in two beakers, X and Y, is measured as 21.5°C.
5 g of sodium chloride is dissolved in the water in beaker X. The temperature changes to 18.0°C.
5 g of calcium oxide is dissolved in the water in beaker Y. The temperature changes to 29.4°C.
Which types of process are occurring in beakers X and Y? [Table_1]
545
524
542
Which reaction produces a white-coloured substance?
561
537
539
Four students collect the gas produced from the reaction of calcium carbonate with dilute hydrochloric acid. Each student records the time taken to collect a volume of gas.
Which results show the highest average rate of reaction?
574
517
552
Which row identifies a chemical and a physical change?
[Table_1]
569
529
554
When magnesium is heated with zinc oxide a reaction occurs.
The equation is shown.
$ \text{Mg} + \text{ZnO} \rightarrow \text{MgO} + \text{Zn} $
Which substance is oxidised?
510
599
518
Which statement describes the properties of hydrochloric acid?
573
559
540
A sample of X is heated with aqueous sodium hydroxide and small pieces of aluminium.
A gas is produced which turns red litmus paper blue.
Aqueous sodium hydroxide solution is added to a second sample of X. A pale green precipitate is observed.
What is X?
561
532
566
A method used to make copper(II) sulfate crystals is shown.
1. Place dilute sulfuric acid in a beaker.
2. Warm the acid.
3. Add copper(II) oxide until it is in excess.
4. Filter the mixture.
5. Evaporate the filtrate until crystals start to form.
6. Leave the filtrate to cool.
What are the purposes of step 3 and step 4?
512
593
586
Which statements describe changes that occur from left to right across a period of the Periodic Table?
1. The atomic number of the elements increases.
2. The metallic character of the elements decreases.
3. The physical state of the elements changes from gas to solid.
566
519
541
Which pair of elements reacts together most violently?
571
571
548
Which is a typical property of transition elements?
549
596
583
Helium is a noble gas.
Which statement about helium is correct?
585
554
517
Some properties of substance X are listed.
● It conducts electricity when molten.
● It has a high melting point.
● It burns in oxygen and the oxide dissolves in water to give a solution with pH 11.
What is X?
584
540
568
Four unknown metals, Q, R, S and T, are reacted with water, steam and dilute hydrochloric acid. The results are shown in the table.
[Table_1]
Which statements are correct?
1. R is the least reactive metal.
2. T could be potassium.
3. S is more reactive than Q and R.
4. Metals react faster with steam than they do with water.
560
592
528
What is added to molten iron to make steel?
553
593
596
Which row describes the uses of aluminium, copper and mild steel? [Table_1]
500
541
522
River water contains soluble impurities, insoluble impurities and bacteria.
River water is made safe to drink by filtration and chlorination.
Which statement is correct?
586
555
552
Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table.
Which row shows the composition of clean, dry air?
[Table_1]
512
548
506
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?
509
595
520
Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction?
526
600
594
Which information about carbon dioxide and methane is correct? [Table_1]
574
567
521
Which statement about the uses of sulfur dioxide is not correct?
515
598
591
Which statement about limestone and lime is correct?
560
565
502
Some fractions obtained from petroleum are listed.
[Table_1]
Which rows are correct?
543
525
597
The structures of three compounds are shown.
Which statement explains why these three compounds have similar chemical properties?
565
547
534
Which statement about ethane is correct?
529
555
527
Which products are obtained by the cracking of an alkane? [Table_1]
580
596
507
Which statement about an aqueous solution of ethanoic acid is correct?
509
500
540
The diagram shows the structure of a monomer and of the polymer made from it.
What are the monomer and polymer?
[Table_1]
560
591
505
