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

MCQ

CH1 - STATES OF MATTER

Which statement explains why ammonia gas, $\text{NH}_3$, diffuses at a faster rate than hydrogen chloride gas, $\text{HCl}$?

2019 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

2.00 g of powdered calcium carbonate is added to 50.0 cm$^3$ of hydrochloric acid. Which apparatus is used to measure the calcium carbonate and the h...

2019 Summer

4

MCQ

CH2 - SEPARATING SUBSTANCES

The measurements from a chromatography experiment using substance F are shown. The diagram is not drawn to scale.What is the $R_f$ value of F?

2019 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

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

2019 Summer

2

MCQ

CH4 - ATOMS COMBINING

Which row describes the formation of single covalent bonds in methane?

2019 Summer

2

MCQ

CH4 - ATOMS COMBINING

Which statement describes the structure of an ionic compound?

2019 Summer

2

MCQ

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

Propane burns in oxygen. $\text{C}_3\text{H}_8 + x\text{O}_2 \rightarrow 3\text{CO}_2 + y\text{H}_2\text{O}$Which values of $x$ and $y$ balance the eq...

2019 Summer

2

MCQ

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A tablet contains 0.080g of ascorbic acid ($M_r = 176$).What is the concentration of ascorbic acid when one tablet is dissolved in 200 cm$^3$ of water...

2019 Summer

2

MCQ

CH1 - STATES OF MATTER

Which statement about the electrolysis of copper(II) sulfate solution using carbon electrodes is correct?

2019 Summer

2

MCQ

CH1 - STATES OF MATTER

Aluminium metal is extracted from aluminium oxide by electrolysis. Which ionic half-equation describes a reaction that occurs at the named electrode?...

2019 Summer

3