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.

Or go directly to:

Class notes Holiday assignments Topical questions Other resources

The diagram show an experiment for investigating electrical conduction in lead (II) fluoride. Study it and answer the questions that follow:

The diagram show an experiment for investigating electrical conduction in lead (II) fluoride. Study it and answer the questions that follow:

(a) On the diagram
(i) Label the anode and the cathode
(ii) Complete the diagram by indicating the condition that is missing but must be present for
electrical conduction to take place.
(b) Why is it necessary to leave a gap between the cork and the boiling tube?
(c) State the observations that are expected at the electrodes during electrical conduction and at the experiment
(d) Write equations for the reactions that take place at the electrodes
(e) Why should this experiment be carried out in a fume chamber?

Answers

(a)

(b) To let the gas produce out, so that it does not explode due to pressure.

(c) At the anode a pale yellow gas is observed

(d)

(e) The gas produced is poisonous.

maurice.mutuku answered the question on October 16, 2019 at 09:37

Answer Attachments

Next: Study the scheme below and answer the questions which follow:

Previous: Standard five pupils were asked to name the parts of a fish as shown below W, X, Y and Z respectively

View more Chemistry Questions and Answers | Return to Questions Index

Exams With Marking Schemes

Related Questions

Study the scheme below and answer the questions which follow: (Solved)

Study the scheme below and answer the questions which follow:

Identify ;
(i) The cation present in solid S
(ii) The anion in solid S
(iii) Write an equation to show how solid S is heated in process T

Date posted: October 16, 2019 . Answers (1)
Starting with barium carbonate solid, dilute sulphuric acid and dilute nitric acid,describe how you would prepare dry barium sulphate solid (Solved)

Starting with barium carbonate solid, dilute sulphuric acid and dilute nitric acid,describe how you would prepare dry barium sulphate solid

Date posted: October 16, 2019 . Answers (1)
Differentiate between Electrolyte and non-electrolyte (Solved)

Differentiate between Electrolyte and non-electrolyte

Date posted: October 16, 2019 . Answers (1)
The set-up was used to electrolyse Lead (II) bromide. Study it and answer the questions that follow; (Solved)

The set-up was used to electrolyse Lead (II) bromide. Study it and answer the questions that follow;

(a) Write an ionic equation for the reaction that occurred at the cathode
(b) State and explain what happened at the anode

Date posted: October 16, 2019 . Answers (1)
In an experiment the following solids were provided to form three students; (Solved)

In an experiment the following solids were provided to form three students; Ca(NO₃)_2(s),NaH₂PO_4(s); Mg(OH)Cl_(s) and Fe(NH₄)₂(SO₄)₂. 6H₂O. They were then told to dissolve the
given solids in differently in 20ml of water.
(a) Classify the given salts accordingly
(b) (i) Explain the process which takes place when FeCl₃ is dissolved in water
(ii) A student placed a moist litmus paper on the product in (i) above. State and explain the observation made

Date posted: October 16, 2019 . Answers (1)
Name the process which takes place when: (a) Anhydrous iron (III) chloride absorb water vapour from the air to form solution (b) Zinc chloride vapour changes directly... (Solved)

Name the process which takes place when:
(a) Anhydrous iron (III) chloride absorb water vapour from the air to form solution
(b) Zinc chloride vapour changes directly to zinc chloride solid

Date posted: October 16, 2019 . Answers (1)
Potassium nitrate crystals in a test-tube were heated strongly for some time. State the observation made: (a) When a glowing splint is introduced into the test-tube... (Solved)

Potassium nitrate crystals in a test-tube were heated strongly for some time. State the observation made:
(a) When a glowing splint is introduced into the test-tube during the heating
(b) At the end of the heating

Date posted: October 16, 2019 . Answers (1)
A piece of marble chips was strongly heated in air for about 30 minutes. Some drops of water were added drop by drop to the... (Solved)

A piece of marble chips was strongly heated in air for about 30 minutes. Some drops of water were added drop by drop to the product when it was still warm.
Using equation, explain:
(i) What happens when the piece of marble chips is heated?
(ii) The reaction that takes place when water is added to the final warm product.

Date posted: October 16, 2019 . Answers (1)
A student poured sodium iodide solution into a small portion of solution Q, a yellow precipitate was formed. Which ion was most likely in solution Q? (Solved)

A student poured sodium iodide solution into a small portion of solution Q, a yellow precipitate was formed.
Which ion was most likely in solution Q?

Date posted: October 16, 2019 . Answers (1)
When exposed to air, crystals of hydrated sodium carbonate loses water of crystallizations;- (i) Name this process (ii) Write the formula of hydrated sodium carbonate (Solved)

When exposed to air, crystals of hydrated sodium carbonate loses water of crystallizations;-
(i) Name this process
(ii) Write the formula of hydrated sodium carbonate

Date posted: October 16, 2019 . Answers (1)
You are provided with the following:- solid lead (II) nitrate, magnesium oxide powder,dilute sulphuric (VI)acid and distilled water. Describe how you can prepare a dry... (Solved)

You are provided with the following:- solid lead (II) nitrate, magnesium oxide powder,dilute sulphuric (VI)acid and distilled water. Describe how you can prepare a dry sample of lead (II) sulphate

Date posted: October 16, 2019 . Answers (1)
The scheme below shows some reactions starting with magnesium oxide. Study it and answer the questions that follow:- (Solved)

The scheme below shows some reactions starting with magnesium oxide. Study it and answer the questions that follow:-

(i) Name the reagents used in steps 2 and 4
(ii) Write an equation for the reaction in step 3
(iii) Describe how a solid sample of anhydrous magnesium carbonate is obtained in step 5

Date posted: October 16, 2019 . Answers (1)
Starting with sodium oxide, describe how a sample of crystals of sodium hydrogen carbonate may be prepared (Solved)

Starting with sodium oxide, describe how a sample of crystals of sodium hydrogen carbonate may be prepared

Date posted: October 16, 2019 . Answers (1)
The table below shows properties of period three chlorides (Solved)

The table below shows properties of period three chlorides

Explain why AlCl3 solid has a much lower boiling point than MgCl2 solid

Date posted: October 16, 2019 . Answers (1)
Use the scheme to answer the questions that follow: (Solved)

Use the scheme to answer the questions that follow:

(a) Identify solid N
(b) Write a balanced equation for the formation of Q
(c) Write the formula of the complex ion formed when sodium hydroxide is added to solution L in excess

Date posted: October 16, 2019 . Answers (1)
Name the type of bonding and structure found in: - (a) Ice (b) Magnesium chloride (Solved)

Name the type of bonding and structure found in: -
(a) Ice
(b) Magnesium chloride

Date posted: October 15, 2019 . Answers (1)
The atomic number of element P is 11 and that of Q is 8 a) Write down the possible formula of the compound formed between P... (Solved)

The atomic number of element P is 11 and that of Q is 8
a) Write down the possible formula of the compound formed between P and Q
b) Using dots (·) and crosses(x) to represent electrons draw a diagram to represent the bonding in the compound in (a) above

Date posted: October 15, 2019 . Answers (1)
The table below shows the elements in the third period, the oxides of the third period and their properties. The letters are not the actual... (Solved)

The table below shows the elements in the third period, the oxides of the third period and their properties. The letters are not the actual symbols of the elements. Study the information and answer
the questions that follow:

i) Complete the table above
ii) Explain the trend in the atomic radius across the period
iii) Explain why the oxide of element V does not exist

Date posted: October 15, 2019 . Answers (1)
The grid below represents part of the periodic table. The letters do not represent actual symbols of the elements. Study it and answer the questions... (Solved)

The grid below represents part of the periodic table. The letters do not represent actual symbols of the elements. Study it and answer the questions that follow:-

(a) What type of bond would you expect in the compound formed between H and F. Explain
(b) (i) Which of the elements J and M will have a greater atomic radius? Explain
(ii) Elements F and N are in the same group of periodic table. How do their atomic
radius compare? Explain
(c) An element W has atomic number 15. Indicate the position it would occupy in the table above
(d) What is the name given to elements X – Z?
(e) Why is J used in electric cables where Q is not
(f) P and J are termed as metalloids. What does the term metalloid mean?
(g) How would you expect the reactivity of H and M to compare? Explain

Date posted: October 15, 2019 . Answers (1)
Sodium metal tarnishes when exposed to the air where a white powder is formed on its surface. A small piece of this sodium metal was dropped... (Solved)

Sodium metal tarnishes when exposed to the air where a white powder is formed on its
surface. A small piece of this sodium metal was dropped into 25g of ethanol and 1200cm³
of hydrogen gas was evolved at r.t.p. The unreacted ethanol was evaporated and a white
solid remained. (Na=23, molar gas volume at r.t.p = 24dm³, C=12, O =16, H=1)
(a) Write a chemical equation for the reaction between ethanol and sodium metal
(b) Determine the mass of sodium that reacted with ethanol
(c) What mass of ethanol evaporated?
(d) The ethanol was evaporated at 80^oC, while the white solid remained unaffected at this
temperature. What is the difference in structure of ethanol and the white solid?
(II) (a) Name an inorganic liquid which liberates hydrogen gas with sodium metal
(b) What two differences would you observe if similar pieces of sodium were dropped
separately into small beakers containing equal amount of ethanol and the liquid
named in (II)(a) above respectively

Date posted: October 15, 2019 . Answers (1)