If the air hole is closed the flame produced is brighter yellow in colour and called the luminous flame which is cooler and used for lighting. If the collar is adjusted by opening it half way more air mixes with the gas hence the flame becomes hotter and to make the flame fully hot the collar is fully opened to produce the hottest flame known as the non-luminous flame.
eddynightsy answered the question on April 17, 2018 at 23:08
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Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc
(Solved)
Explain why it is not advisable to store a solution of cadmium nitrate in a container made of zinc.
Date posted:
April 17, 2018
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Answers (1)
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Dry ammonia gas is passed over heated lead(II) oxide in a combustion tube.
a) What observation would be made in the combustion tube
b) Outline a chemical...
(Solved)
Dry ammonia gas is passed over heated lead(II) oxide in a combustion tube.
a) What observation would be made in the combustion tube
b) Outline a chemical test you would use to identify the colourless liquid collected in the u-tube
c) Name the colourless liquid
d) Write an equation for the reaction between ammonia and lead(II)oxide
Date posted:
April 17, 2018
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Answers (1)
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Name the method that can be used to obtain pure iron (III) chloride from a mixture of iron (III) chloride and sodium chloride
(Solved)
Name the method that can be used to obtain pure iron (III) chloride from a mixture of iron (III) chloride and sodium chloride.
Date posted:
April 14, 2018
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Answers (1)
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Calculate the number of moles of molecules in 7.30g of HCL
(Solved)
Calculate the number of moles of molecules in 7.30g of HCL
Date posted:
April 12, 2018
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Answers (1)
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Starting with lead oxide, describe how you can prepare lead chloride.
(Solved)
Lead chloride is an insoluble salt so it is prepared by double decomposition. So basically we must come up with a soluble salt from the lead oxide, the mix it with another soluble chloride to form the lead chloride.
Date posted:
April 12, 2018
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Answers (1)
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Starting with lead(ii)oxide, describe how you would prepare a solid sample of lead (ii)chloride
(Solved)
Starting with lead(ii)oxide, describe how you would prepare a solid sample of lead (ii)chloride.
Date posted:
April 11, 2018
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Answers (1)
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Fraction distillation of liquid air usually produces nitrogen and oxygen as the major products
1. Name one substance that is used to remove carbon dioxide...
(Solved)
Fraction distillation of liquid air usually produces nitrogen and oxygen as the major products
1. Name one substance that is used to remove carbon dioxide from the air before it is changed into liquid
2. Describe how nitrogen gas is obtained from the liquid air (boiling points nitrogen = -196 degrees oxygen =-183 degrees
Date posted:
April 10, 2018
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Answers (1)
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Explain how you would separate a mixture of nitrogen and oxygen given that their boiling points are -196^0c and 183^0c
(Solved)
Explain how you would separate a mixture of nitrogen and oxygen given that their boiling points are -196^0c and 183^0c.
Date posted:
April 10, 2018
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Answers (1)
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Carbon and silicon belong to the same group of the periodic table yet carbon (4) oxide is a solid with a high melting point. Explain...
(Solved)
Carbon and silicon belong to the same group of the periodic table yet carbon (4) oxide is a solid with a high melting point. Explain this difference
Date posted:
April 6, 2018
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Answers (1)
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Explain how pure nitrogen can be obtained from a mixture of nitrogen and oxygen.
(Solved)
Deals with separation of mixtures under fractional distillation
Date posted:
March 13, 2018
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Answers (1)
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Outline the physical properties of carbon (iv) oxide
(Solved)
Outline the physical properties of carbon (iv) oxide
Date posted:
February 28, 2018
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Answers (1)
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State the uses of carbon (ii) oxide.
(Solved)
State the uses of carbon (ii) oxide.
Date posted:
February 28, 2018
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Answers (1)
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Outline the physical properties of carbon (ii) oxide
(Solved)
Outline the physical properties of carbon (ii) oxide
Date posted:
February 28, 2018
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Answers (1)
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Starting with aqueous magnesium sulphate, describe how you would obtain a sample of magnesium oxide
(Solved)
Starting with aqueous magnesium sulphate, describe how you would obtain a sample of magnesium oxide
Date posted:
February 28, 2018
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Answers (1)
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How would you separate a solid mixture of lead II chloride and copper II oxide?
(Solved)
How would you separate a solid mixture of lead II chloride and copper II oxide?
Date posted:
February 27, 2018
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Answers (1)
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A solution of ammonia in methyl benzene has no effect on red litmus paper while a solution of ammonia in water has. Explain this
(Solved)
A solution of ammonia in methyl benzene has no effect on red litmus paper while a solution of ammonia in water has. Explain this.
Date posted:
February 26, 2018
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Answers (1)
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What are chemical properties of hydrogen gas?
(Solved)
What are chemical properties of hydrogen gas?
Date posted:
February 17, 2018
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Answers (1)
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What are the sources of heat in laboratory?
(Solved)
What are the sources of heat in laboratory?
Date posted:
January 8, 2018
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Answers (1)
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A hydrated salt has the following composition by mass. Iron 20.2%, Oxygen 23.0%, Sulphur 11.5%, Water 45.3%. Its relative formula mass is 278. determine the...
(Solved)
A hydrated salt has the following composition by mass. Iron 20.2%, Oxygen 23.0%, Sulphur 11.5%, Water 45.3%. Its relative formula mass is 278. Determine the formula of hydrated salt
Date posted:
December 31, 2017
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Answers (1)
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Which is the best method to separate sodium chloride from a solution of potassium chloride and sodium chloride mixture?
(Solved)
Which is the best method to separate sodium chloride from a solution of potassium chloride and sodium chloride mixture?
Date posted:
December 30, 2017
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Answers (1)