Study resources on Kenyaplex

Get ready-made curriculum aligned revision materials

Exam papers, notes, holiday assignments and topical questions – all aligned to the Kenyan curriculum.

Browse exam papers

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

How does heat combustion of paraffin wax compare to heat combustion of propane?

Answers

Heat of combustion of paraffin is higher than propane.

Mr Masinde answered the question on June 9, 2019 at 17:38

Answer Attachments

Next: Figure below shows circular waves approaching a concave reflector. Show the reflected waves.

Previous: Six challenges facing industrial sector in Africa

View more Chemistry Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

Give the contrasting difference in chemical properties of chlorine and hydrogen? (Solved)

Give the contrasting difference in chemical properties of chlorine and hydrogen?

Date posted: May 24, 2019 . Answers (1)
The grid below shows part of the periodic table. Study it and answer the questions that follows. a) Give the name of the elements represented by... (Solved)

The grid below shows part of the periodic table. Study it and answer the questions that follows.

a) Give the name of the elements represented by the shaded region.
b) Identify an element which form ion with +2 charge.
c) Which non-metal is most reactive ?
d) Element V is in the second period and group V of the periodic table. Place it on the above grid of the periodic table.
e) State and explain how the atomic radius of U and J compare.
f) Write a chemical equation for the reaction between the oxide of A and water.
g) Explain how the electrical conductivity of A and Y compare.

Date posted: May 24, 2019 . Answers (1)
Study the information given in the table below and answer the questions below. Calculate the enthalpy change for the reaction. CH_4(g) + Cl_2(g) ---> CH₃Cl_(g) +... (Solved)

Study the information given in the table below and answer the questions below.

Calculate the enthalpy change for the reaction.
CH_4(g) + Cl_2(g) ---> CH₃Cl_(g) + HCl_(g)

Date posted: May 24, 2019 . Answers (1)
A volume of 15cm³ of ethane gas was exploded with 50cm³ of oxygen. If both volumes were measured at the same temperature and pressure, calculate... (Solved)

A volume of 15cm³ of ethane gas was exploded with 50cm³ of oxygen. If both volumes were measured at the same temperature and pressure, calculate the volume of resulting gaseous mixture.

Date posted: May 24, 2019 . Answers (1)
Bottle of sodium carbonate, sodium chloride and sugar have lost their labels. A student prepares and tests an aqueous solution of a sample of each... (Solved)

Bottle of sodium carbonate, sodium chloride and sugar have lost their labels. A student prepares and tests an aqueous solution of a sample of each bottle. The results obtained are as shown below.

Complete the table by filling the correct label for each bottle.

Date posted: May 24, 2019 . Answers (1)
Study the scheme below and answer the questions that follow. a) Draw the structure of polymer P. b) Identify compound S. c) Give the reagents and... (Solved)

Study the scheme below and answer the questions that follow.

a) Draw the structure of polymer P.
b) Identify compound S.
c) Give the reagents and conditions for step I and II
Step I:
Reagent
Condition
Step II:
Reagent
Condition

Date posted: May 24, 2019 . Answers (1)
An element Q has a relative atomic mass of 88. When a current of 0.5A was passed through the fused chloride of Q for 32 minutes... (Solved)

An element Q has a relative atomic mass of 88. When a current of 0.5A was passed through the fused chloride of Q for 32 minutes and 10 seconds, 0.44g of Q were deposited at cathode. Determine the charge on the ion of Q. (1 Faraday = 9650

Date posted: May 24, 2019 . Answers (1)
The electronic structures for elements represented by letters A, B, C and D are A - 2.8.6 B - 2.8.2 C - 2.8.1 D - 2.8.8 a)... (Solved)

The electronic structures for elements represented by letters A, B, C and D are
A - 2.8.6 B - 2.8.2 C - 2.8.1 D - 2.8.8
a) Select the element which forms :
i) a double charged cation
ii) a soluble carbonate
b) Which element has the shortest atomic radius ?

Date posted: May 24, 2019 . Answers (1)
Some water samples A, B and C were tested with soap solution. The lathering produced was recorded as good or poor. The results are in... (Solved)

Some water samples A, B and C were tested with soap solution. The lathering produced was recorded as good or poor. The results are in the table below.

a) Identify the anions present in sample of water A.
b) Give an advantage of hard water.
c) State one structural difference between a soapy and soapless detergent.

Date posted: May 24, 2019 . Answers (1)
Metal S removes oxygen combined with P. Q reacts with an oxide of R and not with an oxide of P. P reacts with cold... (Solved)

Metal S removes oxygen combined with P. Q reacts with an oxide of R and not with an oxide of P. P reacts with cold water
but Q does not.
a) Which is the most reactive metal ?
b) Which is the least reactive metal ?
c) Arrange the metals in order of reactivity starting with most reactive to the least reactive.

Date posted: May 24, 2019 . Answers (1)
Below are PH values of some solutions. i) Which solution is likely to be I. acidic rain II. Potassium hydroxide ii) A basic substance V... (Solved)

Below are PH values of some solutions.

i) Which solution is likely to be
I. acidic rain
II. Potassium hydroxide
ii) A basic substance V reacted with both solutions Y and X. What is the nature of V.
iii) Identify two substances that show these characteristics in question (ii) above.

Date posted: May 24, 2019 . Answers (1)
The diagram below is a section of a model of the structure of element T. a) State the type of bonding that exist in T. b) In... (Solved)

The diagram below is a section of a model of the structure of element T.

a) State the type of bonding that exist in T.
b) In which group of the periodic table does element T belong ? Give a reason.

Date posted: May 24, 2019 . Answers (1)
20cm³ of an unknown gas Q takes 12.6 seconds to pass through small orifice. 10cm³ of oxygen gas takes 11.2 seconds to diffuse through the... (Solved)

20cm³ of an unknown gas Q takes 12.6 seconds to pass through small orifice. 10cm³ of oxygen gas takes 11.2 seconds to
diffuse through the same orifice under the same conditions of temperature and pressure. Calculate the molecular mass of
unknown gas. (O = 16)

Date posted: May 24, 2019 . Answers (1)
Differentiate between prescription drugs and over the counter drugs. (Solved)

Differentiate between prescription drugs and over the counter drugs.

Date posted: May 24, 2019 . Answers (1)
When one mole of lithium has completely reacted what volume of hydrogen would be produced at room temperature? (MGV = 24dm³, Li=7) (Solved)

When one mole of lithium has completely reacted what volume of hydrogen would be produced at room temperature? (MGV = 24dm³, Li=7)

Date posted: May 24, 2019 . Answers (1)
When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melts into a golden yellow mobile liquid at 113°C. The... (Solved)

When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melts into a golden yellow mobile liquid at
113°C. The liquid changes at 180°C into a dark brown liquid that is very viscous. More heating at 400°C produces a brown
less viscous liquid.
a) Draw the molecular structure of sulphur in the yellow liquid.
b) Explain why the molten liquid becomes viscous.

Date posted: May 23, 2019 . Answers (1)
Use dots (•) and cross (×) diagrams to draw bond in: a) Al₂Cl₆ (Al = 13, Cl=17) b) Al₂O₃ (Al = 13, O = 8) (Solved)

Use dots (•) and cross (×) diagrams to draw bond in:
a) Al₂Cl₆ (Al = 13, Cl=17)
b) Al₂O₃ (Al = 13, O = 8)

Date posted: May 23, 2019 . Answers (1)
Calculate the number of molecules of water of crystallization in oxalic acid crystals, H2C2O4.nH2O given that 5g of the crystals were made upto 250cm³ of this... (Solved)

Calculate the number of molecules of water of crystallization in oxalic acid crystals, H2C2O4.nH2O given that 5g of the
crystals were made upto 250cm³ of this solution. 25.0cm³ of this solution required 15.9cm³ of 0.5M sodium hydroxide to
neutralise it (H=1, C=12, O=16).

Date posted: May 23, 2019 . Answers (1)
Nylon 6, 6 is a condensation polymer whose structure is as follows. Draw the structures of the monomers in nylon 6, 6 (Solved)

Nylon 6, 6 is a condensation polymer whose structure is as follows.

Draw the structures of the monomers in nylon 6, 6

Date posted: May 23, 2019 . Answers (1)
Magnesium reacts as shown below. a) Identify gas X. b) Between wet sand and magnesium ribbon, which one should be heated first? Explain. (Solved)

Magnesium reacts as shown below.

a) Identify gas X.
b) Between wet sand and magnesium ribbon, which one should be heated first? Explain.

Date posted: May 23, 2019 . Answers (1)