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  • kcse form 2 mathematics questions

Differentiate between empirical and molecular formula.

11/10/2021

Comments

 

​Differentiate between empirical and molecular formula (2mks)

Empirical formula show the simplest whole number ration in which atoms combine to for a compound while molecular formula shows actual number of each kind of atoms present in a molecule of a compound.

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Comments

Use the information below to answer the questions that follow Ethanol is formed as shown below

11/10/2021

Comments

 

​Use the information below to answer the questions that follow Ethanol is formed as shown below

Picture

​Draw the energy cycle diagram and for the formation and combustion of ethanol and calculate the heat of formation of ethanol (3mks)

Picture
Picture

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Comments

A volume of 80cm3 of a mixture of propane (C3H8) and oxygen were ignited in an experiment. The products were cooled and passed through an aqueous sodium hydroxide. The final volume was reduced by 30cm3

11/10/2021

Comments

 

A volume of 80cm3 of a mixture of propane (C3H8) and oxygen were ignited in an experiment. The products were cooled and passed through an aqueous sodium hydroxide. The final volume was reduced by 30cm3

a) Write the equation for the combustion of propane (1mk)

b) Determine the volume of;

i) The component of the original mixture (2mks)

ii) Residual oxygen (1mk)

Picture

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Comments

State three differences between chemical and nuclear reactions.

11/10/2021

Comments

 

​a) State three differences between chemical and nuclear reactions. (3mks)

Chemical reaction

Nuclear reaction

  • It takes place on the outer

  • Take place within the nucleus

  • Heat energy released is less

  • Heat energy released is large

  • Involves electrons

  • Involves neutrons and electrons

  • Affected by environmental factors

  • No affected by the environmental factors

  • such as temperature and pressure


(any three 3mks)

b) Study the figure below and answer the questions that follow 

Study the figure below and answer the questions that follow

Identify the radiations A, B and C (3mks)

  • A-Gamma rays
  • B-Beta rays
  • C-Alpha rays

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Comments

RCOO – Na+ and RCH2OSO3 – Na+ represent two types of cleansing agents

11/10/2021

Comments

 

RCOO – Na+ and RCH2OSO3 – Na+ represent two types of cleansing agents

​a) Name the class of cleansing agent to which each belongs (1mk)

Picture

​b) Which one of the two cleansing agents is likely to pollute the environment. Explain. (2mks)

RCH2OSO3-Na+

Because it contain long chains of alkylbenzene and sulphanate which is difficult to be broken by bacteria action


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Comments

Give a reason why ethanoic acid has a higher boiling point than ethanol which has the same number of Carbon atoms

11/10/2021

Comments

 

a) Give a reason why ethanoic acid has a higher boiling point than ethanol which has the same number of Carbon atoms (1mk)

​Ethanoic acid form hydrogen bond which are stronger than those in ethanol

​b) Draw the structural formula of ethanoic acid (1mk)

Picture

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Comments

Name one chief ore of copper and give its formula

11/10/2021

Comments

 

​a) Name one chief ore of copper and give its formula (2mks)

Copper pyrites -CuFeS2 (any one 1mk)

Cuprite – Cu2O2

​Calculate the mass of copper that would be deposited on the cathode when a steady current of one ampere flows for 20 minutes through copper (II) sulphate solution (Cu = 63.5; Faraday Constance = 96500Cmol-1) (3mks)

Picture

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Comments

The cell convention for an electrochemical cell is shown below

11/10/2021

Comments

 

​The cell convention for an electrochemical cell is shown below

Picture

​a) Name two substances that can be used as electrolytes in the above cell (2mks)

Zinc sulphate or any other solution with zinc ions 

​b) Which of the electrodes is the anode? (2mks)

​Lead electrode

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Comments

Define oxidation and reduction in terms of electrons

11/10/2021

Comments

 

​Define oxidation and reduction in terms of electrons

​Oxidation is the loss of electrons while reduction is gain electrons

Calculate the oxidation number of Chromium in Cr2O2- (1mk)

​x * 2+(-2)=-2

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Comments

State two disadvantages of hard water

11/10/2021

Comments

 
  1. Waste soap
  2. Form coating in kettles;  Pipes and boilers 
  3. Bursting of hot pipes

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Comments

75g of a saturated solution contains 30g of salt calculate;

11/10/2021

Comments

 

​a) The solubility of the salt (2mks)

​b) The percentage of the salt in the saturated solution  (1mk)

Picture

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Comments

The following diagram represents a charcoal burner. Study it and answer the questions that follow

10/10/2021

Comments

 
The following diagram represents a charcoal burner. Study it and answer the questions that follow
The following diagram represents a charcoal burner. Study it and answer the questions that follow

​Write the equations for the reaction at; (3mks)

A

Picture

B

Picture

C

Picture

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Comments

Study the experiment below and answer the questions that follow. The gas produced ignites spontaneously

10/10/2021

Comments

 
Study the experiment below and answer the questions that follow. The gas produced ignites spontaneously
Study the experiment above and answer the questions that follow. The gas produced ignites spontaneously

i) Which metal is used above (1mk)

​Potassium

ii) Which gas was produced (1mk)

​Hydrogen

​iii) What will be the colour of phenolphthalein indicator in the resulting solution? (1mk)

​Pink

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Comments

Name one gas used together with oxygen in welding other than acetylene gas

10/10/2021

Comments

 

​Name one gas used together with oxygen in welding other than acetylene gas (1mk)

​Hydrogen

State two other uses of the gas named above (2mks)

  1. Used in balloons
  2. Used in the manufacture of ammonia gas
  3. Used in the manufacturer of hydrochloric acid 

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Comments

Three brands of inks M, N and O were suspected to be contaminated with substance P.

10/10/2021

Comments

 

​The result is shown below;

Three brands of inks M, N and O were suspected to be contaminated with substance P.

​i) Which ink was contaminated with substance P (1mk)

N

​ii) Name the ink which was pure (1mk)

M

​iii) Identify the other ink which was not pure (1mk)

O

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Comments
<<Previous
    chemistry topical questions and answers for kcse exams

    Chemistry Topics

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