a) Add water to the oluem carefully
b) - Making NH4SO4 fertilizer
- Paints manufacture
- Manufacture of detergents
- Esters
- Explosives
- HCl acid
- Dehydration
- Drying gases
Kavungya answered the question on June 24, 2019 at 08:10
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oxide gas was produced. Calculate the mass of sodium sulphite that was...(Solved)
When excess dilute hydrochloric acid was added to sodium , 960cm3 of sulphur (IV)
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Date posted: June 24, 2019. Answers (1)
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bubbled into 15 litres of cold 2 m sodium hydroxide
(i) Write an equation...(Solved)
In the preparation of a bleaching agent (Sodium hypochlorite), Excess chlorine gas was
bubbled into 15 litres of cold 2 m sodium hydroxide
(i) Write an equation for the reaction between chlorine gas and cold dilute sodium
Hydroxide
(ii) Calculate the:
Number of moles of sodium hydroxide used
Mass in kilograms of the sodium hypochlorite produced = 1. 1175
Date posted: June 24, 2019. Answers (1)
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When excess lead nitrate solution was added to a solution containing sodium chloride,
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chloride in the solution ( Pb = 207, Cl = 35.5 Na = 23)
PbXO3(aq) + 2NaCl (aq) → PbCI2 + NaNO3 (aq) (l)
Date posted: June 24, 2019. Answers (1)
- When carbon dioxide gas was passed through aqueous calcium hydroxide a white
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(a) Write an equation for the reaction that took place
(b) State and...(Solved)
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suspension was formed
(a) Write an equation for the reaction that took place
(b) State and explain the changes that would occur when carbon dioxide gas is bubbled
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Date posted: June 24, 2019. Answers (1)
- The following two tests were carried out on chlorine water contained in two test tubes
a) A piece of blue flower was dropped into the first...(Solved)
The following two tests were carried out on chlorine water contained in two test tubes
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was bleached
(b) The second test- tube was corked and exposed to sunlight after a few days, it was
found to contain a gas that rekindled a glowing splint. Write an equation for the
reaction which produced the gas
Date posted: June 24, 2019. Answers (1)
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In an experiment to study the rate for reaction between duralumin (an alloy of aluminium,
magnesium and copper) and hydrochloric acid, 0.5g of the alloy were reacted with excess
4M hydrochloric acid. The data in the table below was recoded.
Use it to answer the questions that follow.
a) i) On the grid provided, plot a graph of total volume of gas produced (vertical axis)
again time.
ii) From the graph, determine the volume of gas produced at the end of 2 ½ minutes.
b) Determine the rate of reaction between the 3rd and 4th minute.
c) Give a reason why some solid remained at the end of the experiment
d) Given that 2.5cm3 of the total volume of the gas was from the reaction between
magnesium and aqueous hydrochloric acid, calculate the percentage mass of aluminium
present in 0.5g of the alloy.
(Al = 27.0 and Molar gas volume = 24,000cm3 at 298k)
e) State two properties of duralumin that make it more suitable than aluminium in aeroplane
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Date posted: June 24, 2019. Answers (1)
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Date posted: June 24, 2019. Answers (1)
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(a) What is meant by the term?
Substitution reaction:
(b) Give the structural formula and...(Solved)
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(a) What is meant by the term?
Substitution reaction:
(b) Give the structural formula and the name of the organic product formed when
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Date posted: June 24, 2019. Answers (1)
- When a sample of concentrated sulphuric acid was left in an open beaker in a room for
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When a sample of concentrated sulphuric acid was left in an open beaker in a room for
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a) What property of concentrated sulphuric acid was left in an open beaker in a room
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b) State one use of concentrated sulphuric acid that depends on the property named
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Date posted: June 24, 2019. Answers (1)
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crucible until there was no further change in mass.
Calculate the number of moles...(Solved)
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Calculate the number of moles (n) of the water of crystallization
Date posted: June 24, 2019. Answers (1)
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order are lead nitrate, zinc sulphate potassium chloride and...(Solved)
Sample solutions of salt were labeled as I,II, III and IV. The actual solutions, not in that
order are lead nitrate, zinc sulphate potassium chloride and calcium chloride.
a) When aqueous sodium carbonate was added to each sample separately, a white
precipitate was formed in I, III and IV only. Identify solution II.
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precipitate was formed in solutions III and I only.
Identify solution I
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- At 298K and 1 atmosphere, graphite changes into diamond according to the equation:
C (graphite) ? C(diamond); ?=2.9 kJmo-1
In the space provided, sketch a simple energy...(Solved)
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In the space provided, sketch a simple energy level diagram for the above change.
Date posted: June 24, 2019. Answers (1)
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In an experiment, 0.8gm of magnesium of powder were reacted with excess dilute
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The experiment was repeated at 400C. In which experiment was the time taken shorter?
Explain your answer.
Date posted: June 24, 2019. Answers (1)