Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2024 Summer Zone 2

Which gas has the slowest rate of diffusion?

Which statements about the position of the elements in the Periodic Table are correct?\n1. Elements in the same group have similar chemical properties.\n2. Elements in the same period have similar chemical properties.\n3. Elements in the same group have the same number of electron shells.\n4. Elements in the same group have the same number of outer shell electrons.

Which statements about isotopes are correct?

1. Isotopes are atoms of different elements with the same number of protons.
2. Isotopes of the same element have the same chemical properties.
3. Isotopes are atoms with the same relative atomic mass.
4. Isotopes of the same element have the same electronic configuration.

Which diagram shows the arrangement of the outer shell electrons in a molecule of water?

The structures of three substances are shown: . Which substances are hard and have a high melting point?

Information about four substances, W, X, Y, and Z, is shown. [Table_1] W, X, Y, and Z are graphite, poly(ethene), sodium chloride and silicon(IV) oxide but not in that order. What are W, X, Y, and Z?

The structure of glycine is shown.
Which row is correct?
[Table_1]

The incomplete equation for photosynthesis is shown. $ wCO_2 + xH_2O \rightarrow P + yO_2 $ Compound P is a product of the reaction. Which row describes the values of $w$, $x$ and $y$ and gives the empirical formula of compound P? [Table_1]

The concentration and volume of an aqueous alkali are known. Which additional information is required to calculate the number of moles of acid needed to neutralise the aqueous alkali?

Which statement about electrolysis is correct?

Aqueous copper(II) sulfate is electrolysed using copper electrodes. What is the half-equation for the reaction at the cathode?

Three statements about activation energy, $E_a$, are listed.
1. Colliding particles must have at least $E_a$ before they can react.
2. $E_a$ for exothermic reactions is always greater than for endothermic reactions.
3. $E_a$ is always endothermic.
Which statements are correct?

A student adds excess magnesium ribbon to 10 cm$^3$ of 0.5 mol/dm$^3$ sulfuric acid. The hydrogen gas produced is collected and its total volume is measured every 10 seconds. The experiment is repeated with 5 cm$^3$ of 0.5 mol/dm$^3$ sulfuric acid added to 5 cm$^3$ of water using the same mass of magnesium ribbon. Which line on the graph shows the results of the second experiment?

The equation represents the reversible reaction between ethene and steam.
$$ \text{C}_2\text{H}_4(g) + \text{H}_2\text{O(g)} \rightleftharpoons \text{C}_2\text{H}_5\text{OH(g)} $$
\( \Delta H \) is negative.
Which row describes the conditions that produce the greatest yield of ethanol? [Table_1]

Which row identifies the pressure and the catalyst used for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? [Table_1]

Which equation represents a redox reaction?

The equation for the reaction between aluminium and copper(II) oxide is shown. $$2Al + 3CuO \rightarrow Al_2O_3 + 3Cu$$ Which statements about this equation are correct? 1. The oxidation number of the aluminium reactant is +2. 2. The oxidation number of the aluminium in the product is +6. 3. The oxidation number of the copper in the reactant is +2. 4. The oxidation number of the copper product is 0.

What is the colour of thymolphthalein in dilute hydrochloric acid?

Two acids, P and Q, with the same concentration and volume are reacted separately with the same mass of magnesium ribbon. The reactions produce the same total volume of hydrogen gas but acid Q reacts much more slowly than acid P. Which explanation for the difference between P and Q is correct?

Which process is not used in the preparation of an insoluble salt?

Lithium and potassium are metals in Group I of the Periodic Table. Lithium has a melting point of 181 \(^\circ C\) and a density of 0.53 g/cm\(^3\). Which row describes the melting point and density of potassium? [Table_1]

Which statements about transition elements are correct?\n\n1. They have a low density.\n2. They form ions with variable oxidation numbers.\n3. They have a high melting point.\n4. They form only colourless compounds.

Which statements describe the elements in Group VIII of the Periodic Table?
1. Their atoms have full outer electron shells.
2. They are unreactive metals.
3. They are monatomic gases.
4. They are diatomic gases.

Four metals, Q, R, S and T, are each added to separate samples of water, steam and dilute hydrochloric acid. The results are shown.
[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 generally react faster with steam than they react with water.

Metal X acts as a sacrificial metal to prevent iron from corroding. Metal X does \textit{not} act as a sacrificial metal to prevent aluminium from corroding. What is X?

Which equation represents the reduction of a compound found in hematite in the blast furnace?

Which statements about the treatment of domestic water supplies are correct? 1. Filtration is used to remove insoluble substances from the water. 2. Sedimentation is used to remove soluble substances from the water. 3. Carbon is used to remove tastes and odours from the water. 4. Chlorine is used to lower the pH of the water.

Which statement about water is correct?

Cupronickel is used to make coins.
The arrangement of atoms in cupronickel is shown.

Which kind of substance is cupronickel?

Which physical properties are typical of all metals?
1. good heat conductivity
2. low density
3. malleability

Which oxide is used to neutralise acidic gases in flue gas desulfurisation?

Some information about three gases, P, Q and R, is listed.
• Gas P forms when magnesium reacts with dilute hydrochloric acid.
• Gas Q makes up 78\% of the air.
• Gas R forms when gas P reacts with gas Q.
What is gas R?

Which formula represents an alkene?

The structures of two compounds used to make an ester are shown. What is the name of the ester?

Which statement about a homologous series is correct?

Which statements about aqueous ethanoic acid are correct?
1. It contains the functional group --COOH.
2. It reacts with carbonates to produce hydrogen.
3. It turns universal indicator paper blue.
4. It has a pH lower than pH 7.

Alkenes react with steam in an addition reaction. Some alkenes produce only one alcohol product. Some alkenes produce two different alcohols which are structural isomers. Which row gives the number of alcohol isomers formed when ethene reacts with steam and when propene reacts with steam? [Table_1]

What is an advantage of manufacturing ethanol by fermentation rather than by the addition of steam to ethene?

The diagram shows the structure of a polymer. Which structure represents the monomer for this polymer?

Which piece of apparatus is used to measure 24.5 cm$^3$ of gas produced during a reaction?