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

Solid X is heated for 600 seconds. The graph shows the heating curve that is obtained. What is the melting point of X?

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Which statements about diffusion are correct? 1. Aqueous ions cannot diffuse in water. 2. Diffusion is caused by the random movement of particles. 3....

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Which statement about an atom of fluorine, $^{19}_{9}\text{F}$, is correct?

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Two of the isotopes of calcium are represented as $^{40}_{20}\text{Ca}$ and $^{44}_{20}\text{Ca}$. Which statement explains why these isotopes of calc...

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Which statement describes a property of potassium iodide?

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Methanal, CH$_2$O, has a boiling point of $-19^{\circ}$C. At $-20^{\circ}$C, the liquid methanal is a non-conductor of electricity. In a sample of met...

2024 Spring

MCQ

Explain state changes using kinetic particle theory

The structures of diamond and graphite are shown. Which statement about diamond and graphite is correct?

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Which row contains a description of metallic bonding and a property that is explained by reference to metallic bonding? [Table_1]

2024 Spring

MCQ

Explain state changes using kinetic particle theory

What is the relative molecular mass, $M_r$, of sulfur dioxide?

2024 Spring

MCQ

Explain state changes using kinetic particle theory

Magnetite is an ore of iron which contains the ions $\text{Fe}^{2+}$, $\text{Fe}^{3+}$, and $\text{O}^{2-}$ only. What is the formula of magnetite?

2024 Spring