a) Refrigeration
b) They deplete the ozone layer
They cause green house effect
johnmulu answered the question on February 3, 2017 at 13:14
-
Name two isomers of butene
(Solved)
Name two isomers of butene.
Date posted:
February 3, 2017
.
Answers (1)
-
What is meant by isomerism?
(Solved)
What is meant by isomerism?
Date posted:
February 3, 2017
.
Answers (1)
-
One of the reactions undergone by ethene is addition polymerisation. Give the name of the polymer
(Solved)
One of the reactions undergone by ethene is addition polymerisation.
Give the name of the polymer and one disadvantage of the polymer it forms.
Date posted:
February 3, 2017
.
Answers (1)
-
What is the name given to the smallest repeating unit of a polymer?
(Solved)
What is the name given to the smallest repeating unit of a polymer?
Date posted:
February 3, 2017
.
Answers (1)
-
State one industrial use of hydrogenation
(Solved)
State one industrial use of hydrogenation.
Date posted:
February 3, 2017
.
Answers (1)
-
Name the main constituent of natural gas and write an equation for its complete combustion
(Solved)
One of the fuels associated with crude oil is natural gas. Name the main constituent of natural gas and write an equation for its complete combustion.
Date posted:
February 3, 2017
.
Answers (1)
-
Give two use of bitumen
(Solved)
Give two use of bitumen
Date posted:
February 3, 2017
.
Answers (1)
-
What condition could cause a poisonous gas to be formed when kerosene is burnt?
(Solved)
What condition could cause a poisonous gas to be formed when kerosene is burnt? Explain
Date posted:
February 3, 2017
.
Answers (1)
-
Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide
(Solved)
Describe how solid sample of potassium sulphate can be prepared starting with 200 cm3 of 2M potassium hydroxide.
Date posted:
February 3, 2017
.
Answers (1)
-
State the Gay Lussac’s Law
(Solved)
Start the Gay Lussac’s Law.
Date posted:
February 3, 2017
.
Answers (1)
-
Describe how a sample of pure sodium sulphate crystals can be prepared
(Solved)
Starting with 50 cm 3 of 2.8 M sodium hydroxide, describe how a sample of pure sodium sulphate crystals can be prepared.
Date posted:
February 3, 2017
.
Answers (1)
-
State why it is not advisable to wash vehicles using sea water
(Solved)
State why it is not advisable to wash vehicles using sea water.
Date posted:
February 3, 2017
.
Answers (1)
-
State the Boyle's law
(Solved)
State the Boyle's law.
Date posted:
February 3, 2017
.
Answers (1)
-
State the Graham’s law of diffusion
(Solved)
State the Graham’s law of diffusion.
Date posted:
February 3, 2017
.
Answers (1)
-
A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking.
(Solved)
A small crystal of potassium manganate (VII) was placed in a beaker containing water. The beaker was left standing for two days without shaking. State and explain the observation that were made
Date posted:
February 3, 2017
.
Answers (1)
-
State the Charles’ law
(Solved)
State the Charles’ law.
Date posted:
February 3, 2017
.
Answers (1)
-
A few crystals of crystals of potassium manganite (VII) were carefully placed into water in a beaker at one spot
(Solved)
A few crystals of crystals of potassium manganite (VII) were carefully placed into water in a beaker at one spot. The beaker was left undisturbed for two hours. State and explain the observations.
Date posted:
February 3, 2017
.
Answers (1)
-
In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube
(Solved)
In an experiment, ammonium chloride was heated in a test-tube. A moist red litmus paper placed at the mouth of the test tube first changed blue then red. Explain these observations
Date posted:
February 3, 2017
.
Answers (1)
-
Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
(Solved)
Charcoal is a fuel that is commonly used for cooking. When it burns it forms two oxides
a) Name the two oxides
b) State one use of the two oxide
Date posted:
February 3, 2017
.
Answers (1)
-
What is the role of carbon (IV) oxide in fire extinguishing?
(Solved)
What is the role of carbon (IV) oxide in fire extinguishing?
Date posted:
February 3, 2017
.
Answers (1)