Theory

Crystal Hydrates

(a) Salts that are insoluble in water are made by precipitation. Lead(II) iodide, $PbI₂$, is insoluble in water. All nitrates are soluble in wat...

2021 Summer

3

Theory

Crystal Hydrates

(a) (i) Define the term acid.  [1] (ii) The chemical equation shows the changes which occur when the strong acid, hydrochloric acid, is added to...

2019 Summer

2

Theory

Crystal Hydrates

This question is about compounds of nitrogen. (a) Nitrogen reacts with lithium to form lithium nitride, $\text{Li}_3\text{N}$. (i) Write the chemica...

2021 Summer

3

Theory

Crystal Hydrates

(a) Iron and potassium have the same type of bonding. Name and describe the type of bonding in these two elements. (b) Transition elements and Group...

2021 Winter

2

Theory

Crystal Hydrates

(a) Sulfuric acid is manufactured by the Contact process.stage 1 Molten sulfur burns in air to produce sulfur dioxide.stage 2 Sulfur dioxide reacts wi...

2022 Winter

2

Theory

Crystal Hydrates

This question is about reactions of bases and acids. (a) Ammonia is a gas at room temperature. What is the test for ammonia gas? Describe the positive...

2020 Summer

1

Theory

Crystal Hydrates

This question is about copper and its compounds.(a) Describe the bonding in a metallic element such as copper.You may include a diagram as part of you...

2022 Summer

1

Theory

Crystal Hydrates

Acids are important laboratory chemicals. (a) Some acids completely dissociate in water to form ions. (i) State the term applied to acids that compl...

2021 Winter

5

Theory

Crystal Hydrates

A student wanted to make some zinc chloride crystals. The student followed the procedure shown. step 1 Add excess zinc powder to dilute hydrochlor...

2021 Spring

2

Theory

Crystal Hydrates

A student prepares magnesium sulfate crystals, $\text{MgSO}_4$, by adding excess magnesium to dilute sulfuric acid. (a) Write the chemical equation f...

2022 Winter

1

Theory

CH15 - AIR AND WATER

This question is about the first 30 elements in the Periodic Table. Name the element which: (a) is 78% of clean, dry air ................................

2022 Spring

1

Theory

CH4 - ATOMS COMBINING

(a) Add the missing state symbols to the chemical equation for the reaction.MgCO$_3$ ..... + 2HCl ..... $\rightarrow$ MgCl$_2$(aq) + H$_2$O ..... + CO...

2022 Spring

2

Theory

CH15 - AIR AND WATER

Nitrogen dioxide, NO$_2$, is an atmospheric pollutant and is formed in car engines.(a) Explain how nitrogen dioxide is formed in car engines.............

2022 Spring

2

Theory

CH13 - THE BEHAVIOR OF METALS

This question is about chemical reactions and electricity.(a) The diagram shows the apparatus used in the production of electrical energy in a simple ...

2022 Spring

3

Theory

CH17 - ORGANIC CHEMISTRY

This question is about alkanes and alkenes.(a) Short-chain alkanes and alkenes can be formed from long-chain alkanes in a chemical reaction.(i) Name t...

2022 Spring

2

Theory

Plastics

The names of four esters are listed. methyl propanoate ethyl propanoate propyl propanoate butyl propanoate (a) Esters are a family of organic...

2022 Spring

1

MCQ

CH1 - STATES OF MATTER

Which two gases will diffuse at the same rate, at the same temperature?

2022 Summer

1

MCQ

CH1 - STATES OF MATTER

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm\(^3\) of dilute sulfuric acid. Which apparatus is essential to complete ...

2022 Summer

1

MCQ

CH3 - ATOMS AND ELEMENTS

The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown.[Table_1]Which particles have the same c...

2022 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

Which substance should be pure for the intended use?

2022 Summer

1