Get premium membership and access questions with answers, video lessons as well as revision papers.
a) The potassium iodide solution turned from colourless to dark brown
b) Cl2(aq) + 2I-(aq) $\rightarrow$ I2(aq) + 2Cl-(aq)
Oxidation state of chlorine reduces from 0 to -1 hence reduction while oxidation state of iodide ions increases from -1 to 0 hence oxidation therefore the reaction is redox
johnmulu answered the question on February 10, 2017 at 13:16
- 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)
- The equation below represents a redox reaction(Solved)
The equation below represents a redox reaction.
2FeCl2(aq) + Cl2(g) $\rightarrow$ 2FeCl3(aq)
Identify the reducing agent. Give reason.
Date posted: February 7, 2017. Answers (1)
- Chlorine and iodine are elements in the same group in the periodic table. Chlorine gas is yellow while aqueous, iodine, I2(aq) is brown(Solved)
Chlorine and iodine are elements in the same group in the periodic table. Chlorine gas is yellow while aqueous, iodine, I2(aq) is brown
a) What observation would be made if chlorine gas is bubbled through aqueous sodium iodine? Explain using an ionic equation
b) Under certain conditions chlorine and iodine react to give iodine trichloride, ICl3(s). What type of bonding would you expect to exist in iodine trichloride? Explain
Date posted: February 7, 2017. Answers (1)
- Calculate the mass of product that would be formed when 200 cm3 of hydrogen chloride gas reacts completely with excess ammonia gas(Solved)
Calculate the mass of product that would be formed when 200 cm3 of hydrogen chloride gas reacts completely with excess ammonia gas. (H = 1.0, N = 14.0, Cl = 35.5, one mole of gas occupies 24 litres at room temperatures and pressure)
Date posted: February 7, 2017. Answers (1)