a) $SO^{2-}_4$ and $NH ^ + _4$
b) From ammonia and sulphate based fertilizer used in the farms
johnmulu answered the question on February 10, 2017 at 13:48
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a) Give the formula of an oxide which reacts with both dilute hydrochloric acid and hot concentrated sodium hydroxide
b) Give the formulae of the products formed when the oxide in (a) above reacts with excess hot concentrated sodium hydroxide.
Date posted: February 10, 2017. Answers (1)
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90 cm3 of 0.01M calcium hydroxide were added to a sample of water containing 0.001 moles of calcium hydrogen carbonate
a) Write an equation for the reaction which took place
b) Calculate the number of moles of calcium ions in 90 cm3 of 0.01M calcium hydroxide.
c) What would be observed if soap solution was added dropwise to a sample of the water after the addition of calcium hydroxide? Give a reason.
Date posted: February 10, 2017. Answers (1)
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Date posted: February 10, 2017. Answers (1)
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Give the name of each of the processes described below which takes place when the salts are exposed to air for sometimes
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Date posted: February 10, 2017. Answers (1)
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Date posted: February 10, 2017. Answers (1)
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During an experiment, chlorine gas was bubbled into a solution of potassium iodide
a) State the observations made
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Date posted: February 10, 2017. Answers (1)
- Hydrogen chloride gas can be prepared by reacting sodium chloride with an acid, write an equation for the reaction between sodium chloride and acid(Solved)
Hydrogen chloride gas can be prepared by reacting sodium chloride with an acid.
a) Write an equation for the reaction between sodium chloride and acid
b) Give two chemical properties of hydrogen chloride gas
c) State two use of hydrogen chloride
Date posted: February 10, 2017. Answers (1)
- State and explain what would happen if a dry red litmus paper was dropped in a gas jar dry chlorine(Solved)
State and explain what would happen if a dry red litmus paper was dropped in a gas jar dry chlorine.
Date posted: February 10, 2017. Answers (1)
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Date posted: February 10, 2017. Answers (1)
- State and explain what would happen if a dry litmus paper was dropped in a gas jar of chlorine(Solved)
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Date posted: February 10, 2017. Answers (1)
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Date posted: February 10, 2017. Answers (1)
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Name the conditions under which sodium hydroxide reacts with chlorine to form sodium hypochlorite.
Date posted: February 10, 2017. Answers (1)
- During a class experiment, chlorine gas was bubbled into a solution of potassium iodide(Solved)
During a class experiment, chlorine gas was bubbled into a solution of potassium iodide
a) State the observations made.
b) Give two uses of hydrochloric acid
Date posted: February 10, 2017. Answers (1)
- Two reagents that can be used to prepare chlorine gas are manganese (IV) oxide and concentrated hydrochloric acid(Solved)
Two reagents that can be used to prepare chlorine gas are manganese (IV) oxide and concentrated hydrochloric acid
i) Write an equation for the reaction
ii) Give the formula of another reagent that can be reacted with concentrated hydrochloric acid to produce chlorine gas
iii) Describe how the chlorine gas could be dried in the laboratory
Date posted: February 10, 2017. Answers (1)
- State and explain the observations made when excess ammonia gas reacts with chlorine(Solved)
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Date posted: February 10, 2017. Answers (1)
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Name the process which takes place when:
a) Solid carbon (IV) oxide (dry ice) changes directly into gas
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c) Propene gas molecules are converted into a giant molecule
Date posted: February 10, 2017. Answers (1)
- The reaction between hot concentrated sodium hydroxide and chlorine produces sodium chlorate (V), sodium chloride and water.(Solved)
The reaction between hot concentrated sodium hydroxide and chlorine produces sodium chlorate (V), sodium chloride and water.
a) Write the equation for the reaction
b) Give one use of sodium chlorate (V)
Date posted: February 10, 2017. Answers (1)
- Calcium oxide can be used to dry ammonia gas (a) Explain why calcium oxide is not used to dry hydrogen chloride gas(Solved)
Calcium oxide can be used to dry ammonia gas.
(a) Explain why calcium oxide is not used to dry hydrogen chloride gas
(b) Name one drying agent for hydrogen chloride gas
Date posted: February 10, 2017. Answers (1)
- When excess chlorine gas was bubbled into hot concentrated sodium hydroxide, the following reaction occurred(Solved)
When excess chlorine gas was bubbled into hot concentrated sodium hydroxide, the following reaction occurred.
3Cl2(g) + 6NaOH(aq) $\rightarrow$ NaClO3(aq) + 5NaCl(aq) + 3H2O(l)
In which product did chlorine undergo oxidation? Explain.
Date posted: February 10, 2017. Answers (1)
- The following two tests were carried out on chlorine water contained in two test-tubes(Solved)
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 test-tube. Explain why the flower ached.
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 theas.
Date posted: February 10, 2017. Answers (1)