Get premium membership and access questions with answers, video lessons as well as revision papers.
(a) Froth floatation.
(b) PbCO3(s)-------->PbO(s) + CO2(g)
maurice.mutuku answered the question on November 1, 2019 at 06:17
- Study the information provided:-(Solved)
Study the information provided:-
Explain why the melting point of the oxide of W is lower than that of the oxide of Z
Date posted: November 1, 2019. Answers (1)
- Name the following compounds using IUPAC system
(i) CCl4
(ii) HOCl(Solved)
Name the following compounds using IUPAC system
(i) CCl4
(ii) HOCl
Date posted: November 1, 2019. Answers (1)
- The stages shown in the following diagram can be used to extract zinc from its oxide.
Name the stage and the process taking place in it:-(Solved)
The stages shown in the following diagram can be used to extract zinc from its oxide.
Name the stage and the process taking place in it:-
Stage 1
Stage 2
Stage 3
Date posted: November 1, 2019. Answers (1)
- What properties of aluminium and its alloys make it suitable for use in making aircraft parts(Solved)
What properties of aluminium and its alloys make it suitable for use in making aircraft parts
Date posted: November 1, 2019. Answers (1)
- Suggest one manufacturing plant that can be set up near zinc extraction plant. Give
reasons for your answer(Solved)
Suggest one manufacturing plant that can be set up near zinc extraction plant. Give
reasons for your answer
Date posted: November 1, 2019. Answers (1)
- Give one environmental hazard associated with the extraction of zinc metal(Solved)
Give one environmental hazard associated with the extraction of zinc metal
Date posted: November 1, 2019. Answers (1)
- You are provided with 20.0cm3 of 2M sodium hydroxide solution. Explain how you would prepare a solution of sodium hydroxide whose concentration is 0.16M.(Solved)
You are provided with 20.0cm3 of 2M sodium hydroxide solution. Explain how you would prepare a solution of sodium hydroxide whose concentration is 0.16M.
Date posted: October 31, 2019. Answers (1)
- State one use of each of the following radioactive isotopes.
i)Cobalt – 60
ii)Phosphorus – 32 (Solved)
State one use of each of the following radioactive isotopes.
i)Cobalt – 60
ii)Phosphorus – 32
Date posted: October 31, 2019. Answers (1)
- The graph below shows the changes in viscosity in liquid sulphur on heating. Use it to answer the questions that follow.
Explain what happens in the...(Solved)
The graph below shows the changes in viscosity in liquid sulphur on heating. Use it to answer the questions that follow.
Explain what happens in the region:
i)XY
ii)YZ
Date posted: October 31, 2019. Answers (1)
- A sample of 0.5g of gaseous alkane occupied a volume of 200cm3 at s.t.p.
a)Determine the molar mass of the alkane.(C = 12.0, H = 1.0,...(Solved)
A sample of 0.5g of gaseous alkane occupied a volume of 200cm3 at s.t.p.
a)Determine the molar mass of the alkane.(C = 12.0, H = 1.0, Molar gas volume = 22.4dm3)
b)Determine the molecular formula of the alkane and give its I.U.PA.C name.
Date posted: October 31, 2019. Answers (1)
- Study the table below and complete the property column.(Solved)
Study the table below and complete the property column.
Date posted: October 31, 2019. Answers (1)
- Consider the following standard electrode potentials:(Solved)
Consider the following standard electrode potentials:
Some modern cars are made from steel coated with other metals. Using this data above state and explain the best suited metal for coating steel
Date posted: October 31, 2019. Answers (1)
- Calculate the mass of metal J that would be dissolved at the anode when a solution of J (III) nitrite is electrolysed using a current...(Solved)
Calculate the mass of metal J that would be dissolved at the anode when a solution of J (III) nitrite is electrolysed using a current of 1.5amperes for 15minutes (1 Faraday = 96,500C; J = 52)
Date posted: October 31, 2019. Answers (1)
- The following are standard reduction potentials;(Solved)
The following are standard reduction potentials;
Rewrite the 
values of the above half-cells using iron as a reference electrode
Date posted: October 31, 2019. Answers (1)
- Complete the following redox equations by adding the correct number of electrons on either
reactant or product side of the redox equations:-(Solved)
Complete the following redox equations by adding the correct number of electrons on either
reactant or product side of the redox equations:-
Date posted: October 31, 2019. Answers (1)
- The following diagram represents the electrolysis of dilute sodium chloride solution using inert
electrodes(Solved)
The following diagram represents the electrolysis of dilute sodium chloride solution using inert
electrodes
Determine the electrode at which different electrolytic products would be produced if the solution is electrolysed for several hours. Explain
Date posted: October 31, 2019. Answers (1)
- Use the cell representation below to answer the questions that follow:-(Solved)
Use the cell representation below to answer the questions that follow:-
X(s) /X3+(aq) //W2+(aq) /W(s)
(a) Write the equation for the cell reaction above
(b) If the e.m.f of the cell is 0.30V and value for W2+/W is -0.44volts, calculate the for X3+(aq) /X(s)
Date posted: October 31, 2019. Answers (1)
- Name two types of isotopes of phosphorous(Solved)
Name two types of isotopes of phosphorous
Date posted: October 31, 2019. Answers (1)
- The following are electrode potentials of the half cells(Solved)
The following are electrode potentials of the half cells
Calculate the potential difference of the following cell.
Date posted: October 31, 2019. Answers (1)
- The standard hydrogen electrode is used as the reference electrode. Some of the difficulties in using hydrogen gas as an electrode are:(Solved)
The standard hydrogen electrode is used as the reference electrode. Some of the difficulties in using hydrogen gas as an electrode are:
- Hydrogen is a gas at 25oC
- Hydrogen does not conduct electricity
-The half-cell reaction,
is slow and takes long to reach equilibrium.
Explain how these difficulties are solved in the standard hydrogen electrode
Date posted: October 31, 2019. Answers (1)