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

CH11 - ACIDS AND BASES

A student investigated the diffusion of ammonia gas, NH$_3$, and hydrogen chloride gas, HCl.Two sets of apparatus were set up as shown at room tempera...

2018 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

Chromatography is a technique used to separate coloured dyes.Which dye has an $R_f$ value of 0.7?

2018 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

Which piece of apparatus is used to measure exactly 26.3 cm³ of a liquid?

2018 Summer

1

MCQ

CH4 - ATOMS COMBINING

The ‘lead’ in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil slides across the paper...

2018 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

Chlorine exists as two common isotopes, $^{35}Cl$ and $^{37}Cl$.Information about these two isotopes is shown.[Table_1]Which statement explains why th...

2018 Summer

3

MCQ

CH4 - ATOMS COMBINING

Which substance is not a macromolecule?

2018 Summer

2

MCQ

CH12 - THE PERIODIC TABLE

Copper is a metallic element. Which statements about copper are correct? 1. Copper is malleable because layers of ions are in fixed positions and ca...

2018 Summer

2

MCQ

CH6 - USING MOLES

The equation for the combustion of ethane is shown.$2C_2H_6 + 7O_2 \rightarrow 4CO_2 + 6H_2O$Which volume of carbon dioxide, at room temperature and p...

2018 Summer

4

MCQ

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A solution of ethanoic acid, CH$_3$COOH, has a concentration of 2 mol/dm$^3$.Which statement about this solution is correct?

2018 Summer

2

MCQ

CH7 - REDOX REACTIONS

Aqueous copper(II) sulfate is electrolysed using copper electrodes. Which statement is correct?

2018 Summer

3