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

2

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

1

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

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

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 calcium nitrate, $Ca(NO_3)_2,$ by adding calcium carbonate to dilute nitric acid. (a) Write the chemical equation for this reactio...

2022 Winter

2

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

3

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

1

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

2