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?
542
517
583
Which statements about clean, dry air are correct? 1. It is a mixture of elements only. 2. It is a mixture of elements and compounds. 3. It contains only non-metals.
597
567
583
A representation of an atom is shown. What is the nucleon number of this atom?
599
579
561
Which statement describes isotopes of the same element?
595
506
524
Potassium reacts with iodine to form potassium iodide. Which statement about potassium iodide is correct?
507
524
562
Which row describes the properties of a simple molecular substance? [Table_1]
560
520
593
Different forms of an element G are used as lubricants and in cutting tools. What is the structure of G?
554
526
562
The diagram shows the structure of a molecule of ethyl ethanoate. What is the molecular formula of a molecule of ethyl ethanoate?
519
592
529
The formula of a compound containing element X is $\text{Na}_2\text{X}_2\text{O}_3$. The relative formula mass of the compound is 158. What is the relative atomic mass of X?
592
512
557
Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations. The equation for the reaction is shown. \[ \text{CaCO}_3 + \text{SO}_2 \rightarrow \text{CaSO}_3 + \text{CO}_2 \] What is the smallest mass of \( \text{CaCO}_3 \) required to remove 1 tonne of \( \text{SO}_2 \)?
512
506
600
Which statement about electrolysis is correct?
502
564
572
Which statements about hydrogen-oxygen fuel cells are correct?
1. The reaction between hydrogen and oxygen is endothermic.
2. The waste product in a hydrogen-oxygen fuel cell is water.
3. A chemical reaction in the cell produces hydrogen which is used as the fuel.
4. A hydrogen-oxygen fuel cell is used to generate electricity.
574
598
507
The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic? [Table_1]
561
600
594
Solid calcium carbonate reacts with dilute hydrochloric acid. Which changes to the reaction conditions increase the rate of reaction? [Table_1]
561
506
572
Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is faster. Which row identifies L and explains why the reaction is faster? [Table_1]
587
566
582
Which reaction shows a colour change from white to blue?
505
515
545
In a blast furnace, iron(III) oxide is converted to iron and carbon monoxide is converted to carbon dioxide. $$\text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2$$ What happens to each of these reactants?
548
572
520
Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid?
583
599
591
Which element forms an oxide that reacts with an aqueous solution of a base?
559
544
535
Which salt is insoluble?
511
600
565
Some properties of element R are shown.
[Table_1]
In which part of the Periodic Table is R found?
524
589
503
Lithium, sodium and potassium are elements in Group I. Statements about these elements are listed.
1. Lithium is more dense than sodium.
2. Sodium is more reactive than potassium.
3. They all conduct electricity at room temperature.
4. They all react with oxygen at room temperature.
Which statements are correct?
568
549
600
An outline of the Periodic Table is shown. Which name is given to the elements in column Y?
525
589
592
Which row describes the properties of a metal that can be used in the manufacture of aircraft? [Table_1]
565
597
517
Which metallic element is added to iron in the manufacture of stainless steel?
583
533
568
Which statement about the uses of metals is correct?
500
534
531
The list gives the order of some metals and hydrogen in the reactivity series.
Metal X is also included.
$$\begin{align*} \text{most reactive} & \quad K \\ & \quad \text{Mg} \\ & \quad \text{Zn} \\ & \quad \text{H} \\ & \quad \text{X} \\ \text{least reactive} & \quad \text{Cu} \end{align*}$$
Which row shows the properties of metal X?
558
552
556
Which gas in the air is needed for iron to rust?
544
565
561
Why is limestone added to the blast furnace?
517
524
597
Which process removes carbon dioxide from the atmosphere?
505
561
512
The flow chart shows stages in the treatment of river water to produce drinking water. What occurs at stages J and K?
534
549
590
Which two compounds can be mixed together to form an NPK fertiliser?
505
524
519
What are the main substances produced by the fractional distillation of liquid air?
595
571
581
Which diagram shows the displayed formula for the named organic compound?
528
568
518
Poly(ethene) is formed from petroleum using three separate processes. In which order are the processes used?
572
589
566
Gas oil and naphtha are two fractions obtained from petroleum. What are uses of gas oil and naphtha? [Table_1]
534
581
544
Ethene can be polymerised. Which diagram represents the structure of the product formed? [Image_1: Diagrams A, B, C, D representing different chemical structures of ethene polymerisation products.]
515
567
535
An acid–base titration is described. - 25.0 cm$^3$ of dilute aqueous alkali is put into a conical flask. - Indicator is added to the flask. - Dilute acid is added to the aqueous alkali until the indicator changes colour. - The volume of acid used is then recorded. Which use of apparatus is correct?
512
590
565
The apparatus shown is used to separate a mixture. What is the mixture?
544
599
547
The results of tests on three gases, X, Y, and Z, are shown below. Determine the identities of X, Y, and Z based on the given test outcomes. [Table_1] What are X, Y, and Z?
586
542
502
