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The set-up below was used to collect a dry sample of a gas.
Give two reasons why the set-up cannot be used to collect carbon (IV) oxide gas.
ANSWERS
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The thermochemical equations for the formation of hydrogen peroxide under standard conditions are:
Write the thermochemical equation for the molar heat of vaporization of hydrogen peroxide.
ANSWERS
Study the flow chart below and answer the question that follows.
Identify:
a) Solution K b) Solid L c) Gas M
ANSWERS
a)Dilute Nitric acid
b)Silver metal c)oxygen
a) Use the information given below to draw a labeled diagram of an electrochemical cell that can be constructed to measure the electromotive force between G and J.
b) Calculate the Eθ value for the cell constructed in (a) above.
ANSWERS
In an experiment, a few drops of concentrated nitric acid were added to aqueous iron(II) sulphate in a test – tube. Excess sodium hydroxide solution was then added to the mixture.
a) State the observations that were made when: i) Concentrated nitric acid was added to aqueous iron (II) sulphate ii) Excess sodium hydroxide was added to the mixture. b) Write and ionic equation for the reaction which occurred in (a) (ii) above
ANSWERS
When a student was stung by a nettle plant, a teacher applied an aqueous solution of ammonia to the affected area of the skin and the student was relieved of pain .Explain.
ANSWERS
The diagram below shows a Bunsen burner when in use.
Name the regions labeled C and D.
C D
ANSWERS
C- unburnt gas
D- Luminous yellow flame
Both chlorine and iodine are halogens.
a) What are halogens? b) In terms of structure and bonding, explain why the boiling point of chlorine is lower than that of iodine.
ANSWERS
(a) Group (VIII) elements
(b) Chlorine molecule is smaller and the strength of Vander Waals forces between molecules of chlorine is weak as compared to iodine.
15.0cm3 of ethanoic acid (CH3COOH) was dissolved in water to make 500cm3 of solution. Calculate the concentration of the solution in moles per litre. (C=12.0;H=1.0;O=16.0; density of ethanoic acid is 1.05 g/cm3)
ANSWER
The diagram below shows a “Jiko” when in use. Study it and answer the questions that follow.
a) Identify the gas formed at region A.
b) State and explain the observation made at region B.
ANSWERS
(a) Carbon (IV) oxide
(b) Blue flame, carbon (II) oxide is burning |
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AuthorMaurice Atika is a teacher and a netprenuer. |
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