- Animal fats or vegetable oils
- Caustic soda (NaOH)
Kavungya answered the question on March 25, 2019 at 10:40
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Date posted: March 25, 2019. Answers (1)
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Oxygen and nitrogen are obtained from air by fractional distillation. Why can this method be used for this purpose yet cannot be used to obtained hydrogen and oxygen from water?
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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(i) Sewage
(ii) Fertilisers
(iii) Chemicals/Pesticides
(iv) Oil and detergents(Solved)
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(i) Sewage
(ii) Fertilisers
(iii) Chemicals/Pesticides
(iv) Oil and detergents
Date posted: March 25, 2019. Answers (1)
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State one property of A that makes it move faster than B towards...(Solved)
The diagram below represents a paper chromatogram of two sugars A and B.
State one property of A that makes it move faster than B towards the solvent front.
Date posted: March 25, 2019. Answers (1)
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Explain what is observed after a few days.(Solved)
An experiment was set up as shown in the diagram below.
Explain what is observed after a few days.
Date posted: March 25, 2019. Answers (1)
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In an experiment, dry hydrogen chloride gas was passed through heated Zinc turnings as shown in the diagram below. The gas produced was then passed through heated Lead II Oxide.
(i) What is the function of the water in the flask?
(ii) Write equations for the reactions that took place in the tubes.
(iii) How would the total mass of tube V and its contents compare before and after the experiment? Explain.
Date posted: March 25, 2019. Answers (1)
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Which Solvent is the most suitable for purifying the extract? Explain.(Solved)
Paper chromatography of a plant extract gave the following results.
Which Solvent is the most suitable for purifying the extract? Explain.
Date posted: March 25, 2019. Answers (1)
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(a) Name...(Solved)
A form one pupil lit a Bunsen burner with its air hole fully open. The regions of the flames were labelled as shown below.
(a) Name part (A)
(b) Which region is the hottest
(c) Which colour is region C?
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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An experiment on competition for oxygen was carried out and results were tabulated in the table below. Use information in the table to answer the questions that follow.
(i) What is the best conclusion that can be drawn on the basis of the above results?
(ii) What is the order of reactivity of elements in this experiment?
(iii) What are the products formed where a reaction occurred?
(iv) If you were given an oxide copper how would you obtain copper metal from it?
Date posted: March 25, 2019. Answers (1)
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Distinguish between acidic and basic oxides.
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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(b) Name one substance which speeds up the rusting process(Solved)
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(b) Name one substance which speeds up the rusting process
Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)
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Date posted: March 25, 2019. Answers (1)