The systematic name for Cu 2 S and CuS needs to be determined. Concept Introduction : The chemical formula is representation of number of different types of elements present in the compound.
The systematic name for Cu 2 S and CuS needs to be determined. Concept Introduction : The chemical formula is representation of number of different types of elements present in the compound.
Solution Summary: The author explains that the chemical formula is representation of number of different types of elements present in the compound.
10
(c) An element T has a melting point of 30°C and a boiling point of 2440 °C. It conducts
electricity at room temperature. It burns in oxygen to form an oxide with formula T₂O₂
which can react with both acids and bases. T also forms a compound with fluorine,
which has a high melting point and conducts electricity in molten form. The
approximate relative atomic mass of T is 70.
(1) What type of oxide is T,O,?
(i) Give two properties that indicate that T is probably a metal.
1.
2
(iii) Predict the formula for the fluoride of T
E
[1]
[2]
N
[1]
(iv) What are the products of the electrolysis of the molten fluoride of using inert
electrodes?
and
(v) In which group and period of the Periodic Table will T be placed?
group
period
21
2)
(vi) Write the symbol of the element in the Periodic Table which most closely
resembles T.
Write the balanced chemical equation for the reaction of these pairs of reactants:
(a) Calcium and bromine
(b) Aluminum and oxygen
Give TWO reasons why aluminium metal was not commonly used till last century, even
though it is one of the most common elements on earth.
(b)
Why are copper and lithium such important elements today?
Chapter 3 Solutions
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