Theory

Interpret heating and cooling curves

1. This question is about gases found in clean, dry air and gases found in polluted air. (a) Name one gas found in clean, dry air which contributes to...

2023 Spring

Theory

Interpret heating and cooling curves

2. Lithium, sodium, and potassium are Group I elements. (a) Name the type of bonding in these elements. [1] (b) Sodium reacts with cold water to form ...

2023 Spring

Theory

Interpret heating and cooling curves

3. The Haber process is used to manufacture ammonia. (a) State the main source of each gas used in the Haber process. Nitrogen... Hydrogen... [2] (b) ...

2023 Spring

Theory

Interpret heating and cooling curves

4. Copper is element 29 in the Periodic Table. (a) Brass contains copper. (i) Name the other metal in brass. [1] (ii) State the term given to a mixtur...

2023 Spring

Theory

Interpret heating and cooling curves

5. Propane, propene, propan-1-ol, and propanoic acid are members of different homologous series. Molecules of these substances contain three carbon at...

2023 Spring

Theory

Interpret heating and cooling curves

1. Some symbol equations and word equations, A to J, are shown:A. $\text{Fe}^{3+} + 3\text{OH}^– \rightarrow \text{Fe(OH)}_3$B. $\text{H}^+ + \text{...

2023 Summer

Theory

Interpret heating and cooling curves

2. (a) The symbols of the elements in Period 2 of the Periodic Table are shown:Li Be B C N O F NeUse the symbols of the elements in Period 2 to answer...

2023 Summer

Theory

Interpret heating and cooling curves

3. This question is about ionic and covalent compounds.(a) (i) Sodium reacts with oxygen to form the ionic compound sodium oxide. The electronic confi...

2023 Summer

Theory

Interpret heating and cooling curves

4. Oxygen is produced by the decomposition of aqueous hydrogen peroxide. Manganese(IV) oxide, MnO2, is a catalyst for this reaction.(a) State the mean...

2023 Summer

Theory

Interpret heating and cooling curves

5. This question is about electricity and chemical reactions.(a) The electrolysis of concentrated aqueous potassium bromide using graphite electrodes ...

2023 Summer

MCQ

Explain state changes using kinetic particle theory

Substance M is a solid at 30°C.The substance is heated to 80°C and its temperature measured as it cools down to room temperature.The cooling curve i...

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Which gas has the fastest rate of diffusion?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

There are two stable isotopes of bromine. The mass number of isotope 1 is 79. The mass number of isotope 2 is 81. Which statement is correct?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Which statement about ions and ionic bonds is correct?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Part of the Periodic Table is shown. Which type of chemical bonding is present in the oxide of F and in the oxide of G?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Elements X and Y react to form a compound.Element X loses two electrons and element Y gains one electron.What is the charge on the ions of elements X ...

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Which statement about graphite explains why it is used as an electrode?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

Methane, CH_4, burns in air to form carbon dioxide and water. What is the balanced equation for this reaction?

2023 Spring

MCQ

Explain state changes using kinetic particle theory

The equation for the thermal decomposition of sodium hydrogencarbonate is shown.$$2\text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text...

2023 Spring

MCQ

Explain state changes using kinetic particle theory

An electrolysis experiment is done using carbon electrodes. Hydrogen and oxygen are formed at the electrodes. What is the electrolyte?

2023 Spring