Theory

Stoichiometry

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

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

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

Stoichiometry

What is the concentration of the solution when 31.8g of sodium carbonate, $\text{Na}_2\text{CO}_3$, is dissolved in water to make a solution of 250 cm...

2021 Winter

2

MCQ

Stoichiometry

What is the empirical formula of an oxide of iron, formed by reacting 2.24 g of iron with 0.96 g of oxygen?

2020 Winter

2

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

2

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

1

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

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

MCQ

CH1 - STATES OF MATTER

The rate of diffusion of two gases, methane, CH₄, and ethene, C₂H₄, is measured using the apparatus shown.Which gas diffuses faster and why?

2016 Summer

3

MCQ

CH2 - SEPARATING SUBSTANCES

A sample of a dye is investigated by chromatography. A line is drawn across a piece of chromatography paper and a spot of the dye is placed on it.The ...

2016 Summer

1

MCQ

CH2 - SEPARATING SUBSTANCES

The paper chromatogram below was obtained from four different dyes.Which dye has an $R_f$ value of 0.7?

2016 Summer

2

MCQ

CH3 - ATOMS AND ELEMENTS

Which statements about isotopes of the same element are correct?1. They are atoms which have the same chemical properties because they have the same n...

2016 Summer

1

MCQ

CH4 - ATOMS COMBINING

The table shows the electronic structure of four atoms.[Table_1]atom | electronic structure---- | ------------------- W | 2,8,1 X | 2,8,4 Y | 2,...

2016 Summer

2

MCQ

CH4 - ATOMS COMBINING

Which statement describes the attractive forces between molecules (intermolecular forces)?

2016 Summer

2

MCQ

CH4 - ATOMS COMBINING

The diagram represents the general structure of a solid Z. What is Z?

2016 Summer

2

MCQ

CH6 - USING MOLES

A compound, X, contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass.The relative molecular mass, $M_r$, of X is 60.What is the molecular form...

2016 Summer

2

MCQ

CH11 - ACIDS AND BASES

25 cm$^3$ of 0.1 mol/dm$^3$ hydrochloric acid exactly neutralise 20 cm$^3$ of aqueous sodium hydroxide.The equation for this reaction is:NaOH + HCl $\...

2016 Summer

1

MCQ

CH1 - STATES OF MATTER

Which reactions could take place at the anode during electrolysis? 1. $4\text{OH}^-(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g) + 4e^-$ 2...

2016 Summer

2