i) Zn(OH)2-4
ii) [Cu (NH3)4]2+
johnmulu answered the question on February 10, 2017 at 13:25
- Give the name of each of the processes described below which takes place when the salts are exposed to air for sometimes(Solved)
Give the name of each of the processes described below which takes place when the salts are exposed to air for sometimes
i) Anhydrous copper sulphate becomes wet
ii) Magnesium chloride forms an aqueous solution
iii) Fresh crystals of sodium carbonate, Na2CO3.10H2O become covered with white powder of formula Na2CO3.H2O
Date posted: February 10, 2017. Answers (1)
- Explain the following observation. A chloride dissolves in water to form an electrolyte while the same chloride dissolves in methylbenzene to form a non-electrolyte(Solved)
Explain the following observation. A chloride dissolves in water to form an electrolyte while the same chloride dissolves in methylbenzene to form a non-electrolyte
Date posted: February 10, 2017. Answers (1)
- During an experiment, chlorine gas was bubbled into a solution of potassium iodide (a) State the observations made(Solved)
During an experiment, chlorine gas was bubbled into a solution of potassium iodide
a) State the observations made
b) Using an ionic equation, explain why the reaction is redox.
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)
- By using only dilute hydrochloric acid, describe how a student would distinguish between barium sulphite from barium sulphate(Solved)
By using only dilute hydrochloric acid, describe how a student would distinguish between barium sulphite from barium sulphate
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)
State and explain what would happen if a dry litmus paper was dropped in a gas jar of chlorine
Date posted: February 10, 2017. Answers (1)
- Give two uses of sodium hypochlorite(Solved)
Give two uses of sodium hypochlorite
Date posted: February 10, 2017. Answers (1)
- Give the conditions under which sodium hydroxide reacts with chlorine to form sodium hypochlorite(Solved)
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)
State and explain the observations made when excess ammonia gas reacts with chlorine
Date posted: February 10, 2017. Answers (1)
- Name the process which takes place when: (a) Solid carbon (IV) oxide (dry ice) changes directly into gas(Solved)
Name the process which takes place when:
a) Solid carbon (IV) oxide (dry ice) changes directly into gas
b) A red litmus paper turns white when dropped into chlorine water.
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)
- Give the name of reagent which when reacted with concentrated hydrochloric acid produce chlorine gas(Solved)
Give the name of reagent which when reacted with concentrated hydrochloric acid produce chlorine gas.
Date posted: February 10, 2017. Answers (1)
- A sample of hydrogen chlorine was dissolved in water to make 250 cm3 of solution 25 cm3 of the solution required(Solved)
A sample of hydrogen chlorine was dissolved in water to make 250 cm3 of solution 25 cm3 of the solution required 46 cm3 of 11.0 M sodium hydroxide for complete neutralization
i) Calculate the number of moles of hydrochloric acid in 25 cm3 of solution
ii) Determine the mass of hydrogen chloride that was dissolved to make 250 cm3 of solution (Cl = 35.5, H = 1.0)
Date posted: February 7, 2017. Answers (1)
- The equation below represents a redox reaction (a) a) write down the equation for the reduction process(Solved)
The equation below represents a redox reaction.
Mg(s) + 2HCl(aq) $\rightarrow$ MgCl2(aq) + H2(g)
a) write down the equation for the reduction process
b) which substance is oxidized
Date posted: February 7, 2017. Answers (1)