- Dry chlorine gas was passed through two pieces of coloured cotton cloth as shown.(Solved)
Dry chlorine gas was passed through two pieces of coloured cotton cloth as shown.
a) State what is observed in each experiment.
Experiment 1
Experiment 2
b) Explain your observation using an equation.
Date posted: May 16, 2019. Answers (1)
- The molar heat of formation of carbon (II) oxide is -105kJ/mol, molar heat of combustion of
carbon is -393kJ/mol.By using an energy cycle diagram, determine the...(Solved)
The molar heat of formation of carbon (II) oxide is -105kJ/mol, molar heat of combustion of
carbon is -393kJ/mol.By using an energy cycle diagram, determine the molar heat of combustion of
Carbon(II)oxide.
Date posted: May 16, 2019. Answers (1)
- The system below is at equilibrium. Explain how an increase in the following affects the equilibrium position. (i) Temperature (ii) Pressure.(Solved)
The system below is at equilibrium.
Explain how an increase in the following affects the equilibrium position.
(i) Temperature
(ii) Pressure.
Date posted: May 16, 2019. Answers (1)
- Bronze is an alloy of copper and another metal. Identify the other metal.(Solved)
Bronze is an alloy of copper and another metal. Identify the other metal.
Date posted: May 16, 2019. Answers (1)
- During the extraction of copper and Zinc from their Ores, some of the processes include.
(i) Crushing
(ii) Mixing of the crushed Ore with Oil and water...(Solved)
During the extraction of copper and Zinc from their Ores, some of the processes include.
(i) Crushing
(ii) Mixing of the crushed Ore with Oil and water and bubbling air through it.
(i) Name the process(ii) above.
(ii) What is the purpose of process (ii) above?
Date posted: May 16, 2019. Answers (1)
- The boiling and melting points of alkali metals decreases down the group while the melting and boiling points of halogens increase down the group.Explain(Solved)
The boiling and melting points of alkali metals decreases down the group while the melting and boiling points of halogens increase down the group.Explain
Date posted: May 16, 2019. Answers (1)
- Helium is used instead of Hydrogen to fill balloons.Explain(Solved)
Helium is used instead of Hydrogen to fill balloons.Explain
Date posted: May 16, 2019. Answers (1)
- A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.(Solved)
A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.
Date posted: May 16, 2019. Answers (1)
- When a current of 2.5 amperes was passed through a cell containing N2+ ions of a metal for 25 minutes, the mass of the cathode increased by...(Solved)
When a current of 2.5 amperes was passed through a cell containing N2+ ions of a metal for
25 minutes, the mass of the cathode increased by 0.36g. ( 1 faraday = 96500 coulombs).Determine the relative atomic mass of element N.
Date posted: May 16, 2019. Answers (1)
- State and explain the observation made in the set-up below.(Solved)
State and explain the observation made in the set-up below.
Date posted: May 16, 2019. Answers (1)
- Explain why aluminium articles are not easily corroded.(Solved)
Explain why aluminium articles are not easily corroded.
Date posted: May 16, 2019. Answers (1)
- A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.(Solved)
A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.
I) Name gas X
(ii) Why should gas X be burned.
(iii) Write a well balanced chemical equation for the reaction that takes place in the conical
flask in the first few seconds.
Date posted: May 16, 2019. Answers (1)
- Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:(Solved)
Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:
(i) Anode
(ii) Cathode
Date posted: May 16, 2019. Answers (1)
- Dilute hydrochloric acid is warmed with sodium sulphide.State a chemical test for the gas evolved.(Solved)
Dilute hydrochloric acid is warmed with sodium sulphide.State a chemical test for the gas evolved.
Date posted: May 16, 2019. Answers (1)
- 100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C =...(Solved)
100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C = 12, O = 16)
Date posted: May 16, 2019. Answers (1)
- A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow...(Solved)
A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow even after cooling.
a) Identify gases A and B
b) Write a balanced chemical equation for the decomposition of solid K.
Date posted: May 16, 2019. Answers (1)
- Below is a set up used to collect hydrogen gas.(Solved)
Below is a set up used to collect hydrogen gas.
a) Identify with reasons, two mistakes in the set up.
b) Explain the role of hydrogen in the manufacture of margarine.
Date posted: May 16, 2019. Answers (1)
- Complete the following reactions.(Solved)
Complete the following reactions.
Date posted: May 16, 2019. Answers (1)
- The scheme below shows some reaction sequence starting with solid M(Solved)
The scheme below shows some reaction sequence starting with solid M
(i) Name Solid M
(ii) Write the formula of complex ion present in Solution Q
(iii) Write ionic equation of reaction between barium nitrate and solution N.
Date posted: May 16, 2019. Answers (1)
- What is the oxidation number of chlorine in ClO-4?(Solved)
What is the oxidation number of chlorine in ClO-4?
Date posted: May 16, 2019. Answers (1)