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

CH2 - SEPARATING SUBSTANCES

Petroleum is a useful natural resource.The diagram shows how petroleum can be separated into useful substances.(a) What is the name of the separation ...

2020 Spring

2

Theory

CH11 - ACIDS AND BASES

Aluminium is extracted from its ore. The ore is converted into pure aluminium oxide, which then undergoes electrolysis as shown.(a) (i) Name an ore of...

2020 Spring

2

Theory

CH12 - THE PERIODIC TABLE

(a) Identify the element which is in Group VI and Period 4...............................................................................................

2020 Spring

3

Theory

CH13 - THE BEHAVIOR OF METALS

Iron is a typical transition element.Iron:● acts as a catalyst● forms coloured compounds● has more than one oxidation state.(a) Name one major i...

2020 Spring

3

Theory

CH18 - POLYMERS

There are two types of polymers.(a) Addition polymers are made from many identical small units. (i) What is the term used to describe these small unit...

2020 Spring

2

MCQ

CH1 - STATES OF MATTER

A mixture of ice and water is left to stand and the ice melts.Which row describes what happens as the ice is melting?[Table_1]temperature of mixture |...

2020 Summer

3

MCQ

CH1 - STATES OF MATTER

Which piece of apparatus should be used to measure exactly 21.4 cm$^3$ of water?

2020 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

The chromatogram for an unknown dye is shown.What is the $R_f$ value of the dye?

2020 Summer

3

MCQ

CH3 - ATOMS AND ELEMENTS

The atomic number and nucleon number of a potassium atom are shown.[Table_1]How many protons, neutrons and electrons are in a potassium ion, K⁺?

2020 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

The electronic structures of two atoms, P and Q, are shown. P and Q combine together to form a compound.What is the type of bonding in the compound an...

2020 Summer

2