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

Theory

CH3 - ATOMS AND ELEMENTS

The table shows the numbers of protons, neutrons and electrons in particles A to I.[Table_1]Answer the following questions about particles A to I. Eac...

2021 Spring

1

Theory

CH15 - AIR AND WATER

The elements shown are gases at room temperature and pressure.hydrogennitrogenoxygenchlorine(a) State which one of these gases is green..................

2021 Spring

1

Theory

CH16 - SOME NON-METALS AND THEIR COMPOUNDS

This question is about ammonia.(a) Nitrogen reacts with hydrogen to form ammonia in an industrial process.$$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(...

2021 Spring

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

Plastics

The table shows the names or structures of organic compounds P to U. (a) Give the letters of the organic compounds, P to U, that are unsaturated hy...

2021 Spring

2

Theory

CH18 - POLYMERS

Polymers are large molecules built up from small molecules.(a) State the name given to the small molecules from which polymers are made..................

2021 Spring

2

MCQ

CH1 - STATES OF MATTER

A gas is released at point P in the apparatus shown. Which gas turns the damp universal indicator paper red most quickly?

2021 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

A mixture is separated using the apparatus shown. What is the mixture?

2021 Summer

2

MCQ

CH2 - SEPARATING SUBSTANCES

Which statement about paper chromatography is correct?

2021 Summer

3

MCQ

CH3 - ATOMS AND ELEMENTS

Element X has 7 protons. Element Y has 8 more protons than X. Which statement about element Y is correct?

2021 Summer

1