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]
593
533
529
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?
575
536
547
A fractionating column is used to separate the hydrocarbon fractions in petroleum by fractional distillation.
Which row describes the properties of the fractions that condense at the top of the fractionating column?
[Table_1]
529
594
531
Some information about solid silver chloride and solid sodium chloride is shown.
• Silver chloride and sodium chloride do not dissolve in kerosene.
• Silver chloride is insoluble in water but sodium chloride is soluble in water.
• The boiling point of silver chloride is 1547°C and the boiling point of sodium chloride is 1413°C.
Which processes are used to separate a mixture of solid silver chloride and solid sodium chloride?
595
590
538
A covalent molecule M contains four shared pairs of electrons. What is M?
596
533
522
An isotope of chromium is represented by $^{52}_{24}\text{Cr}$.
Which statement about an atom of this isotope of chromium is correct?
593
550
591
Substances P and Q both conduct electricity.
P is a mixture of two different types of atom.
Q is made of only one type of atom.
Which row describes P and Q?
[Table_1]
561
502
507
Graphite is a form of carbon.
Why can graphite be used as a lubricant?
561
545
556
The structure of a molecule is shown.
What is the formula of the molecule?
541
535
582
During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode?
510
533
527
Which statements about endothermic reactions are correct?
1. The energy of the products is greater than the energy of the reactants.
2. The energy of the reactants is greater than the energy of the products.
3. The temperature of the surroundings increases during the reaction.
4. The temperature of the surroundings decreases during the reaction.
556
551
544
Equations for the formation of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are shown.
$\text{CoCl}_2 \cdot 6\text{H}_2\text{O} \rightarrow \text{CoCl}_2 + 6\text{H}_2\text{O}$
$\text{CuSO}_4 \cdot 5\text{H}_2\text{O} \rightarrow \text{CuSO}_4 + 5\text{H}_2\text{O}$
Which statement about the reactions is not correct?
506
586
516
A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown.
• Place 50 $\text{cm}^3$ of dilute hydrochloric acid in a conical flask.
• Add a known volume of water to the conical flask.
• Heat the conical flask to the required temperature.
• Add 1.0 g of calcium carbonate to the conical flask.
• Measure the time taken for the reaction to finish.
Which volume of water and which temperature gives the shortest time taken for the reaction to finish? [Table_1]
517
575
597
Mercury(II) oxide, HgO, decomposes when heated.
The equation is shown.
$2\text{HgO} \rightarrow 2\text{Hg} + \text{O}_2$
Why is this a reduction reaction?
528
543
596
Carbonic acid is a weak acid formed when carbon dioxide dissolves in water.
What is the pH of the solution?
600
564
516
Solid X is tested as shown.
[Table_1]
What is X?
535
504
562
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?
572
592
579
Which set of elements shows the change from metallic to non-metallic character across a period of the Periodic Table?
500
566
578
Which pair of elements reacts together most violently?
597
555
524
What is \textbf{not} a typical property of a transition element?
556
540
584
Part of the Periodic Table is shown.
Which element is used to provide an inert atmosphere?
554
547
599
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.
513
546
540
Four different metals are reacted with an equal volume of dilute hydrochloric acid. The results of the reactions are shown.
[Table_1]
What is the order of reactivity of the four metals starting with the most reactive?
505
594
564
Iron is extracted from its ore in a blast furnace.
The equations for four different reactions are shown.
1. $4Fe + 3CO_2 \rightarrow 2Fe_2O_3 + 3C$
2. $CO_2 \rightarrow C + O_2$
3. $CO_2 + C \rightarrow 2CO$
4. $Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2$
Which equations represent reactions that occur in the blast furnace?
568
544
575
River water contains soluble impurities, insoluble impurities and bacteria.
River water is made safe to drink by filtration and chlorination.
Which statement is correct?
501
510
535
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]
513
500
513
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?
532
582
524
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?
501
523
503
Which information about carbon dioxide and methane is correct?
[Table_1]
526
554
525
What is not a use of sulfur dioxide?
579
566
561
Which process is used to obtain lime from limestone?
522
536
590
Petroleum is separated by fractional distillation. Which statement about the fractions produced is correct?
568
527
536
Which compounds have similar chemical properties?
571
544
525
Which statement about a molecule of ethane is correct?
538
561
528
Which products are obtained by the cracking of an alkane?
[Table_1]
583
518
518
Which statements about aqueous ethanoic acid are correct?
1. It has a pH value of 10.
2. It reacts with metal carbonates to produce carbon dioxide gas.
3. It reacts with magnesium metal to produce hydrogen gas.
586
537
586
The diagram shows the structure of a monomer and of the polymer made from it.
What are the monomer and polymer?
522
582
538
