No questions found
The melting points and boiling points of four elements are shown.
[Table_1]
In which elements do the particles vibrate about fixed positions at 0°C?
523
522
579
The apparatus used to separate a mixture is shown.
What is the mixture?
513
573
585
During an experiment a measurement is recorded in $\text{cm}^3$.
Which apparatus is used?
507
596
516
Substance Q boils at 445°C and is a yellow solid at room temperature.
Which temperature could be the melting point of pure Q?
595
529
597
Which diagram shows a mixture of an element and a compound?
524
511
500
Which pair of atoms contains the same number of neutrons?
541
551
511
In which row do the properties described match the type of bonding?
[Table_1]
548
590
559
Which statement explains why graphite is used a lubricant?
556
521
531
What is the relative formula mass of magnesium nitrate, $\text{Mg(NO}_3\text{)}_2$?
517
537
545
The diagram shows the electrolysis of two solutions using inert electrodes.
Which substance is made at each electrode?
511
580
501
Two chemical processes are described.
• During the combustion of ethanol, energy is ......1...... .
• During the electrolysis of aqueous sodium chloride, energy is ......2...... .
Which words complete gaps 1 and 2?
586
552
560
Water is added to anhydrous copper(II) sulfate in a test-tube. The mixture becomes hot. Which type of reaction and energy level diagram apply to this reaction? [Table with energy diagrams and types of reaction depicted for Options A, B, C, and D]
530
552
508
The mass of a beaker and its contents is plotted against time.
Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid in an open beaker?
[Image_1 showing four graphs labeled A, B, C, D with mass vs. time]
586
579
553
When blue copper(II) sulfate is heated, a white solid and water are formed.
The white solid turns blue and gives out heat when water is added to it.
Which terms describe the blue copper(II) sulfate and the reactions?
[Table_1]
579
554
525
An experiment was carried out to find the rate of reaction when 1 g of solid X reacts with 100 cm$^3$ of solution Y.
The experiment took place too quickly for measurements to be made.
Which change could be made to slow down the reaction?
575
504
568
The equations for two reactions P and Q are given.
P $\underline{2\text{NaNO}_2} + \text{O}_2 \rightarrow 2\text{NaNO}_3$
Q $\underline{2\text{HgO}} \rightarrow 2\text{Hg} + \text{O}_2$
In which of these reactions does oxidation of the underlined substance occur?
[Table_1: showing options A, B, C, D with checkmarks corresponding to reactions P and Q]
585
588
509
What is not a typical characteristic of acids?
546
521
526
Elements Q and R both burn in air. The oxides formed both dissolve in water. The solution of the oxide formed from element Q turns Universal Indicator red. The solution of the oxide formed from element R turns Universal Indicator blue. What are Q and R? [Table_1]
503
538
563
Copper(II) sulfate can be prepared by adding excess copper(II) carbonate to sulfuric acid.
Why is an excess of copper(II) carbonate added?
545
514
515
Compound P reacts with hydrochloric acid to produce a gas that turns limewater milky.
What is P?
592
572
519
Which statement about nitrogen and phosphorus is not correct?
577
571
518
Sodium and rubidium are elements in Group I of the Periodic Table. Which statement is correct?
570
565
585
Which properties do the elements chromium, iron and vanadium have in common?
1. They all conduct electricity.
2. They, or their compounds, can act as catalysts.
3. They all form coloured compounds.
540
503
500
Why is argon gas used to fill electric lamps?
521
504
533
Which process is used to extract iron from hematite in the blast furnace?
521
551
544
Some reactions of three metals are listed in the table.
[Table]
| metal | metal reacts with dilute hydrochloric acid | metal oxide is reduced by carbon |
|-------|-------------------------------------|---------------------------------|
| P | yes | yes |
| Q | yes | no |
| R | no | yes |
What is the order of reactivity of the metals?
514
547
519
Which uses of the metals shown are both correct?
[Table_1]
575
517
517
The flow chart shows stages in the treatment of river water to produce drinking water.
What occurs at stages X and Y?
505
573
573
Which element in Group VI is a component of air?
528
574
532
Iron is a metal that rusts in the presence of oxygen and water.
Mild steel is used for ......1...... and is prevented from rusting by ......2....... .
Stainless steel does not rust. It is produced by ......3...... iron with another metal.
Which words complete gaps 1, 2 and 3?
[Table_1]
540
565
556
A chemical reaction is carried out on substance X.
A gas is produced that turns red litmus paper blue.
What is this reaction?
529
583
589
Some marble chips (calcium carbonate) are heated strongly and substances X and Y are formed.
Substance X is a white solid that reacts with water, giving out heat. Substance Y is a colourless gas.
What are substances X and Y?
[Table_1]
600
575
509
The structures of four organic compounds are shown:
Which compounds are unsaturated?
591
502
548
Which equation represents the complete combustion of butane, $C_4H_{10}$?
526
534
552
X, Y and Z are three hydrocarbons.
X $\text{CH}_2=\text{CH}_2$ Y $\text{CH}_3-\text{CH}=\text{CH}_2$ Z $\text{CH}_3-\text{CH}_2-\text{CH}=\text{CH}_2$
What do compounds X, Y and Z have in common?
1 They are all alkenes.
2 They are all part of the same homologous series.
3 They all have the same boiling point.
540
545
595
The table shows bonds that are present and bonds that are not present in compound X.
[Table]
bonds
C-C ✓
C=C ✗
C-H ✓
C-O ✓
C=O ✓
O-H ✓
What type of compound is X?
549
576
560
The diagram shows a reaction sequence.
Which row names the processes X, Y and Z?
502
583
544
Molecules of a substance react together as shown.
Which type of reaction has taken place?
530
523
590
