Theory

Stoichiometry

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

Stoichiometry

Sodium hydrogencarbonate is found in baking powder. When sodium hydrogencarbonate is heated it forms three products. $2\text{NaHCO}_3 \rightarrow \t...

2021 Summer

2

Theory

Stoichiometry

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

Stoichiometry

(a) Calculate the maximum mass of the copper(II) sulfate crystals, CuSO_4·5H_2O, that can form using the following steps.• Calculate the number of ...

2019 Summer

1

Theory

Stoichiometry

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

6

Theory

Stoichiometry

(a) Calculate the relative formula mass, $M_r$, of $Cu_2FeSnS_4$.$M_r$ of $Cu_2FeSnS_4$ = .................................(b) The $M_r$ of $SnO_2$ is...

2018 Winter

2

Theory

Stoichiometry

Barium carbonate, BaCO$_3$, is an insoluble solid. (a) When barium carbonate is heated strongly, it undergoes thermal decomposition. One of the produ...

2017 Summer

2

Theory

Stoichiometry

When lead(II) nitrate is heated, two gases are given off and solid lead(II) oxide remains. The equation for the reaction is shown. $$2\text{Pb(NO}_3\t...

2016 Winter

3

Theory

Stoichiometry

(a) A compound contains 72% magnesium and 28% nitrogen. What is its empirical formula? (b) A compound contains only aluminium and carbon. 0.03 mo...

2009 Summer

3

MCQ

Stoichiometry

4.55 g of zinc is reacted with 50 cm3 of 2.25 mol/dm3 dilute hydrochloric acid.The equation for the reaction is shown.$\text{Zn} + 2\text{HCl} \righta...

2022 Winter

1

MCQ

CH1 - STATES OF MATTER

Small crystals of purple $\text{KMnO}_4$ $(M_r = 158)$ and orange $\text{K}_2\text{Cr}_2\text{O}_7$ $(M_r = 294)$ were placed at the centres of separa...

2017 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

Pure water has a boiling point of 100 °C and a freezing point of 0 °C. What is the boiling point and freezing point of a sample of aqueous sodium c...

2017 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

A chromatogram obtained from the chromatography of four substances is shown. Which substance has an $R_f$ value of 0.6?

2017 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

Sodium reacts with chlorine to form sodium chloride.Which statements describe what happens to the sodium atoms in this reaction?1. Sodium atoms form p...

2017 Summer

1

MCQ

CH3 - ATOMS AND ELEMENTS

Diamond is extremely hard and does not conduct electricity.Which statement explains these properties?

2017 Summer

3

MCQ

CH4 - ATOMS COMBINING

Which statement about metals is not correct?

2017 Summer

1

MCQ

CH4 - ATOMS COMBINING

Aluminium reacts with fluorine.$xAl(s) + yF_2(g) \rightarrow zAlF_3(s)$Which values of $x$, $y$ and $z$ balance the equation?[Table_1]

2017 Summer

2

MCQ

CH4 - ATOMS COMBINING

Carbon monoxide burns in oxygen to produce carbon dioxide. $$2\text{CO}(g) + \text{O}_2(g) \rightarrow 2\text{CO}_2(g)$$ Which mass of carbon dioxide...

2017 Summer

1

MCQ

CH1 - STATES OF MATTER

Which statement about electrolysis is correct?

2017 Summer

2

MCQ

CH1 - STATES OF MATTER

The reactivity series for a number of different metals is shown.[Image_1: Reactivity series and diagram]The diagram shows different metal strips dippe...

2017 Summer

3