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- Study the scheme below and use it to answer the questions that follow:-(Solved)
Study the scheme below and use it to answer the questions that follow:-
i) Name the following compounds:-
I. Product T ………………………… II. K ………
ii) State one common physical property of substance G
iii) State the type of reaction that occurred in step J
iv) Give one use of substance K
v) Write an equation for the combustion of compound P
vi) Explain how compounds CH3CH2COOH and CH3CH2CH2OH can be distinguished chemically
vii) If a polymer K has relative molecular mass of 12,600, calculate the value of n (H=1 C =12)
Date posted: November 6, 2019. Answers (1)
- Name the compound with the formula below :
CH3CH2CH2ONa(Solved)
Name the compound with the formula below :
CH3CH2CH2ONa
Date posted: November 6, 2019. Answers (1)
- State two factors that affect the properties of a polymer(Solved)
State two factors that affect the properties of a polymer
Date posted: November 6, 2019. Answers (1)
- State why C2H4 burns with a more smoky flame than C2H6(Solved)
State why C2H4 burns with a more smoky flame than C2H6
Date posted: November 6, 2019. Answers (1)
- The structure below shows some reactions starting with ethanol. Study it and answer the questions that follow:(Solved)
The structure below shows some reactions starting with ethanol. Study it and answer the questions that follow:
(i) Write the formula of the organic compounds P and S
(ii) Name the type of reaction, the reagent(s) and condition for the reactions in the following steps :-
(I) Step I
(II) Step II
(III) Step III
(iii) Name reagent R ……………………………………………………………
(iv) Draw the structural formula of T and give its name
(v) (I) Name compound U………………………………………………………..
(II) If the relative molecular mass of U is 42000, determine the value of n (C=12, H=1)
Date posted: November 6, 2019. Answers (1)
- Give the IUPAC names of the following compounds:(Solved)
Give the IUPAC names of the following compounds:
Date posted: November 6, 2019. Answers (1)
- What is absolute ethanol?(Solved)
(a) What is absolute ethanol?
(b) State two conditions required for process G to take place efficiently
Date posted: November 6, 2019. Answers (1)
- Study the polymer below and use it to answer the questions that follow:(Solved)
Study the polymer below and use it to answer the questions that follow:
(a) Give the name of the monomer and draw its structures
(b) Identify the type of polymerization that takes place
(c) State one advantage of synthetic polymers
Date posted: November 6, 2019. Answers (1)
- The formula below represents active ingredients of two cleansing agents A and B(Solved)
The formula below represents active ingredients of two cleansing agents A and B
Which one of the cleansing agents would be suitable to be used in water containing magnesium hydrogen carbonate? Explain
Date posted: November 6, 2019. Answers (1)
- A natural polymer is made up of the monomer:(Solved)
A natural polymer is made up of the monomer:
(a) Write the structural formula of the repeat unit of the polymer
(b) When 5.0 x 10-5 moles of the polymer were hydrolysed, 0.515g of the monomer were obtained.
Determine the number of the monomer molecules in this polymer.
(C = 12; H = 1; N = 14; O =16)
Date posted: November 1, 2019. Answers (1)
- Sodium octadecanoate has a chemical formula CH3(CH2)6 COO-Na+, which is used as soap.
Explain why a lot of soap is needed when washing with hard water(Solved)
Sodium octadecanoate has a chemical formula CH3(CH2)6 COO-Na+, which is used as soap.
Explain why a lot of soap is needed when washing with hard water
Date posted: November 1, 2019. Answers (1)
- Write chemical equation to represent the effect of heat on ammonium carbonate(Solved)
Write chemical equation to represent the effect of heat on ammonium carbonate
Date posted: November 1, 2019. Answers (1)
- Explain the environmental effects of burning plastics in air as a disposal method(Solved)
Explain the environmental effects of burning plastics in air as a disposal method
Date posted: November 1, 2019. Answers (1)
- The structure of the monomer phenyl ethene is given below:-(Solved)
The structure of the monomer phenyl ethene is given below:-
a) Give the structure of the polymer formed when four of the monomers are added together
b) Give the name of the polymer formed in (a) above
Date posted: November 1, 2019. Answers (1)
- In the extraction of aluminium form its ore by the use of electrolysis, explain the following observations:-
(i) the graphite anode is replaced from time to...(Solved)
In the extraction of aluminium form its ore by the use of electrolysis, explain the following observations:-
(i) the graphite anode is replaced from time to time
(ii) the steel tank which can also serve as an electrode is also lined with graphite cathode
Date posted: November 1, 2019. Answers (1)
- Aluminum metal is mainly extruded from molten Bauxite by electrolysis.
a) Name the main impurity in this ore.
b) Briefly describe how the impurity is removed from...(Solved)
Aluminum metal is mainly extruded from molten Bauxite by electrolysis.
a) Name the main impurity in this ore.
b) Briefly describe how the impurity is removed from the ore before electrolysis process.
Date posted: November 1, 2019. Answers (1)
- Name the following compounds.(Solved)
Name the following compounds.
Date posted: November 1, 2019. Answers (1)
- One of the steps in the extraction of Zinc metal from its ore is roasting of the ore in excess
oxygen. Write equations for the reactions...(Solved)
One of the steps in the extraction of Zinc metal from its ore is roasting of the ore in excess
oxygen. Write equations for the reactions that take place when the ore in (a) above is roasted
Date posted: November 1, 2019. Answers (1)
- The following table shows some properties of period three elements and their chlorides. Study it and answer the questions that follow.
a)Complete the table by filling...(Solved)
The following table shows some properties of period three elements and their chlorides. Study it and answer the questions that follow.
a)Complete the table by filling in the formula of the missing chlorides.
b)In terms of structure and bonding, explain the following observations:
i)The melting point of aluminium is higher than that of sodium.
ii)The melting point of chlorine is lower than that of sulphur.
iii)The melting point of aluminium chloride is lower than that of magnesium chloride.
c)Sodium chloride dissolves in water to form a neutral solution but aluminium chloride dissolves
to form an acidic solution. Explain this observation.
d)Generally, the first ionization energy increases across the period. Explain
e)Iron (III) oxide was found to be contaminated with magnesium chloride. Describe how a pure dry sample of iron (III) oxide can be obtained.
Date posted: November 1, 2019. Answers (1)
- The diagram below is a simplified apparatus for extraction of sodium. Study it and answer the
equations that follow:-(Solved)
The diagram below is a simplified apparatus for extraction of sodium. Study it and answer the
equations that follow:-
(a) Which substances come out at:- P & Q
(b) What is the role of the diaphragm
(c) Write the equation of the reaction forming sodium
Date posted: November 1, 2019. Answers (1)