Fractional distillation is a separation technique where where chemical compounds are separated by heating them to a temperature at which one or more fractions vaporizes based on their differences in their boiling points; whereas crystallization is a method of refining substances by separating them based on their differences in their solubility in certain solvents.This is achieved by mixing the compound with a solvent,heating it and cooling it gradually so that each of its constituent components forms crystals that can be removed from the solution.
Chemist2018 answered the question on June 28, 2018 at 12:46
-
What is the difference of alkali and alkaline?
(Solved)
What is the difference of alkali and alkaline?
Date posted:
June 22, 2018
.
Answers (1)
-
What mass of sodium hydroxide would be needed to neutralize exactly 200 cubic centimetre of a solution containing 49 grammes of sulphuric acid in dm-3
(Solved)
What mass of sodium hydroxide would be neededto neutralize exactly 200 cubic centimetre of a solution containing 49 grammes of sulphuric acid in dm^-3
Date posted:
June 18, 2018
.
Answers (1)
-
State the assumptions of capture recapture method of population size estimation
(Solved)
State the assumptions of capture recapture method of population size estimation.
Date posted:
May 19, 2018
.
Answers (1)
-
Explain why sodium hydroxide is preferred when making a setup to investigate the active part of air using a burning candle
(Solved)
Explain why sodium hydroxide is preferred when making a setup to investigate the active part of air using a burning candle.
Date posted:
May 14, 2018
.
Answers (1)
-
Describe the process of obtaining nitrogen gas from air by fractional distillation of liquid air
(Solved)
Describe the process of obtaining nitrogen gas from air by fractional distillation of liquid air.
Date posted:
May 10, 2018
.
Answers (1)
-
What is Ostwald process?
(Solved)
What is Ostwald process?
Date posted:
May 5, 2018
.
Answers (1)
-
Write the chemical equation for reaction that takes place in the absorption tower in the contact process
(Solved)
Write the chemical equation for reaction that takes place in the absorption tower in the contact process.
Date posted:
May 5, 2018
.
Answers (1)
-
Outline the five major processes of the contact process in the production of sulphuric acid
(Solved)
Outline the five major processes of the contact process in the production of sulphuric acid.
Date posted:
May 5, 2018
.
Answers (1)
-
In the last stage of the solvay process, a mixture of sodium hydrogen carbonate and ammonium chloride is formed. (i.) State the method of separation used.
(Solved)
In the last stage of the solvay process, a mixture of sodium hydrogen carbonate and ammonium chloride is formed.
i.) State the method of separation used.
ii.) Write an equation showing how lime is slaked.
iii.) Name the by-product recycled in the above process.
Date posted:
May 2, 2018
.
Answers (1)
-
Solvay process is used to manufacture sodium carbonate. (a.) Name two raw materials. (b.) How is sodium carbonate obtained from sodium hydrogen carbonate. (c.) Name two main substances...
(Solved)
Solvay process is used to manufacture sodium carbonate.
a.) Name two raw materials.
b.) How is sodium carbonate obtained from sodium hydrogen carbonate.
c.) Name two main substances that are recycled.
Date posted:
May 2, 2018
.
Answers (1)
-
Describe a chemical test that can be used to distinguish between sodium carbonate and sodium hydrogen carbonate.
(Solved)
Describe a chemical test that can be used to distinguish between sodium carbonate and sodium hydrogen carbonate.
Date posted:
May 2, 2018
.
Answers (1)
-
Starting from calcium carbonate, describe how a solid sample of calcium sulphate can be prepared.
(Solved)
Starting from calcium carbonate, describe how a solid sample of calcium sulphate can be prepared.
Date posted:
May 2, 2018
.
Answers (1)
-
A form four student accidentally mixed sodium carbonate and calcium carbonate. Describe how he would obtain a dry sample of sodium carbonate from the mixture.
(Solved)
A form four student accidentally mixed sodium carbonate and calcium carbonate. Describe how he would obtain a dry sample of sodium carbonate from the mixture.
Date posted:
May 2, 2018
.
Answers (1)
-
Explain how one would obtain pure sample of potassium carbonate crystals from a mixture of potassium carbonate and calcium carbonate.
(Solved)
Explain how one would obtain pure sample of potassium carbonate crystals from a mixture of potassium carbonate and calcium carbonate.
Date posted:
May 1, 2018
.
Answers (1)
-
Describe how a sample of magnesium carbonate can be prepared using the following agents.
-Sodium carbonate
-Magnesium oxide
-Dilute hydrochloric acid
(Solved)
Describe how a sample of magnesium carbonate can be prepared using the following agents.
-Sodium carbonate
-Magnesium oxide
-Dilute hydrochloric acid
Date posted:
May 1, 2018
.
Answers (1)
-
Describe how a solid sample of lead (II) sulphate would be prepared using the following reagents.
. dilute nitric (V) acid
. solid lead (II) carbonate
. dilute...
(Solved)
Describe how a solid sample of lead (II) sulphate would be prepared using the following reagents.
. dilute nitric (V) acid
. solid lead (II) carbonate
. dilute sulphuric (VI) acid
Date posted:
May 1, 2018
.
Answers (1)
-
A sample of copper turning was found to be contaminated with copper ii oxide.describe how copper metal can be separated from the mixture
(Solved)
A sample of copper turning was found to be contaminated with copper ii oxide.describe how copper metal can be separated from the mixture
Date posted:
May 1, 2018
.
Answers (1)
-
A solution of tetrachloromethane burns colourless when propene gas is bubbled through it . What type of reaction takes place?
(Solved)
A solution of tetrachloromethane burns colourless when propene gas is bubbled through it. What type of reaction takes place?
Date posted:
May 1, 2018
.
Answers (1)
-
Suggest a reason why BaSO4(a pigment made from sulphuric acid) would be
suitable in making paint for cars.
(Solved)
Suggest a reason why BaSO4(a pigment made from sulphuric acid) would be
suitable in making paint for cars.
Date posted:
April 29, 2018
.
Answers (1)
-
Nitric v acid is manufactured by catalytic oxidation of ammonia gas (a) Name two raw materials other than ammonia that are used to manufacture the acid.....
(Solved)
Nitric v acid is manufactured by catalytic oxidation of ammonia gas
a. Name two raw materials other than ammonia that are used to manufacture the acid
b. Name the catalyst used.
c. Write an equation for reaction between nitric v acid and ammonia gas
d. sate one use of product in c
Date posted:
April 24, 2018
.
Answers (1)