-To the nitric acid in a beaker, add barium carbonate solid as you stir until effervescence stops.
- Filter to obtain the filtrate
- Add dilute nitric acid to the filtrate and filter to obtain the residue
- Dry the residue under the sun or between filter papers.
maurice.mutuku answered the question on October 16, 2019 at 08:35
- Define the following terms:
(a) Crystallization
(b) Salting out as used in soap making(Solved)
Define the following terms:
(a) Crystallization
(b) Salting out as used in soap making
Date posted: October 16, 2019. Answers (1)
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voltmeters. The observations recorded below were made:-(Solved)
When an electric current was passed through two molten substances E and F in separate
voltmeters. The observations recorded below were made:-
Complete the table above
Date posted: October 16, 2019. Answers (1)
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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)
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In an experiment the following solids were provided to form three students; Ca(NO3)2(s),NaH2PO4(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)
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(a) Anhydrous iron (III) chloride absorb water vapour from the air to form solution
(b) Zinc chloride vapour changes directly...(Solved)
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(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)
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(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)
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Study the flow chart below and answer the questions that follow
a) Identify ;
i) gases C and B
ii) Ions likely to be presented in solid A
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)
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(i) Name this process
(ii) Write the formula of hydrated sodium carbonate
Date posted: October 16, 2019. Answers (1)
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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)
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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)
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Date posted: October 16, 2019. Answers (1)
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Study the information in the table below and answer the questions that follow:-
(a) Complete the table by filling in the blank spaces (i) , (ii) (iii), and (iv)
(b) Identify the particles which are electrically charged
Date posted: October 16, 2019. Answers (1)
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Explain why AlCl3 solid has a much lower boiling point than MgCl2 solid
Date posted: October 16, 2019. Answers (1)
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Below is a table oxides of some period three elements
(a) Give the systematic name of Cl2O
(b) Explain why Na2O exists as a solid whereas SO2 is a gas at room temperature
Date posted: October 16, 2019. Answers (1)
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Date posted: October 16, 2019. Answers (1)
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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)