Helium is light and inert thus will not burn in air like Hydrogen.
sharon kalunda answered the question on May 16, 2019 at 12:46
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A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.
(Solved)
A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.
Date posted:
May 16, 2019
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Answers (1)
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When a current of 2.5 amperes was passed through a cell containing N2+ ions of a metal for 25 minutes, the mass of the cathode increased by...
(Solved)
When a current of 2.5 amperes was passed through a cell containing N2+ ions of a metal for
25 minutes, the mass of the cathode increased by 0.36g. ( 1 faraday = 96500 coulombs).Determine the relative atomic mass of element N.
Date posted:
May 16, 2019
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Answers (1)
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State and explain the observation made in the set-up below.
(Solved)
State and explain the observation made in the set-up below.
Date posted:
May 16, 2019
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Answers (1)
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Explain why aluminium articles are not easily corroded.
(Solved)
Explain why aluminium articles are not easily corroded.
Date posted:
May 16, 2019
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Answers (1)
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A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.
(Solved)
A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.
I) Name gas X
(ii) Why should gas X be burned.
(iii) Write a well balanced chemical equation for the reaction that takes place in the conical
flask in the first few seconds.
Date posted:
May 16, 2019
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Answers (1)
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Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:
(Solved)
Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:
(i) Anode
(ii) Cathode
Date posted:
May 16, 2019
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Answers (1)
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Dilute hydrochloric acid is warmed with sodium sulphide.State a chemical test for the gas evolved.
(Solved)
Dilute hydrochloric acid is warmed with sodium sulphide.State a chemical test for the gas evolved.
Date posted:
May 16, 2019
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Answers (1)
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100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C =...
(Solved)
100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C = 12, O = 16)
Date posted:
May 16, 2019
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Answers (1)
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A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow...
(Solved)
A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow even after cooling.
a) Identify gases A and B
b) Write a balanced chemical equation for the decomposition of solid K.
Date posted:
May 16, 2019
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Answers (1)
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Below is a set up used to collect hydrogen gas.
(Solved)
Below is a set up used to collect hydrogen gas.
a) Identify with reasons, two mistakes in the set up.
b) Explain the role of hydrogen in the manufacture of margarine.
Date posted:
May 16, 2019
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Answers (1)
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Complete the following reactions.
(Solved)
Complete the following reactions.
Date posted:
May 16, 2019
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Answers (1)
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The scheme below shows some reaction sequence starting with solid M
(Solved)
The scheme below shows some reaction sequence starting with solid M
(i) Name Solid M
(ii) Write the formula of complex ion present in Solution Q
(iii) Write ionic equation of reaction between barium nitrate and solution N.
Date posted:
May 16, 2019
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Answers (1)
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What is the oxidation number of chlorine in ClO-4?
(Solved)
What is the oxidation number of chlorine in ClO-4?
Date posted:
May 16, 2019
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Answers (1)
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Identify the acid and base in the equation below.
(Solved)
Identify the acid and base in the equation below.
Date posted:
May 16, 2019
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Answers (1)
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In terms of structure and bonding explain why diamond has a high melting point while
graphite has a low melting point.
(Solved)
In terms of structure and bonding explain why diamond has a high melting point while
graphite has a low melting point.
Date posted:
May 16, 2019
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Answers (1)
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A compound G reacts with 2 moles of bromine to form another compound whose graphical
formula is.
(Solved)
A compound G reacts with 2 moles of bromine to form another compound whose graphical
formula is.
i) What is the formula and name of compound G
ii) State the observations made when acidified potassium chromate (VI) is
added to compoundG
Date posted:
May 16, 2019
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Answers (1)
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Explain why the compound Cl2O has a very low melting and boiling point.
(Solved)
Explain why the compound Cl2O has a very low melting and boiling point.
Date posted:
May 16, 2019
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Answers (1)
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Two elements A and B have electronic configurations 2.8.3 and 2.6 respectively.
(Solved)
Two elements A and B have electronic configurations 2.8.3 and 2.6 respectively.
a) To which group and period does element B belong?
b) If the two react, what is the formula of the compound they form
Date posted:
May 16, 2019
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Answers (1)
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The graph below shows the decay for a sample of 400g of iodine -131. Study is and
answer question that follow.
(Solved)
The graph below shows the decay for a sample of 400g of iodine -131. Study is and
answer question that follow.
(i) Use the graph to determine the half-life of the sample
(ii) What fraction of the original sample remains after 16.2 days.
Date posted:
May 16, 2019
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Answers (1)
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Define the following terms
(Solved)
Define the following terms
(i) Nuclear fission
(ii) Nuclear fussion.
Date posted:
May 16, 2019
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Answers (1)