Phosphrous trichloride has simple molecular structure where molecules are held together by weak van der Waals forces. Magnesium chloride has giant ionic structure where ions are held by strong ionic bonds
johnmulu answered the question on February 2, 2017 at 09:10
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Compound Q is a solid with a giant ionic structure. In what forms would be compound conduct an electric current?
(Solved)
Compound Q is a solid with a giant ionic structure. In what forms would be compound conduct an electric current?
Date posted:
February 2, 2017
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Answers (1)
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Diamond and graphite are allotropes of carbon. In terms of structure and bonding explain the following
(Solved)
Diamond and graphite are allotropes of carbon. In terms of structure and bonding explain the following:
i) Diamond is used in drilling through hard rocks
ii) Graphite is used as a lubricant
Date posted:
February 2, 2017
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Answers (1)
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Explain why the reactivity of group (VII) elements decreases down the group
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Explain why the reactivity of group (VII) elements decreases down the group.
Date posted:
February 2, 2017
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Answers (1)
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An atom of hydrogen can form two ions. Write two equations to show how a neutral atom of hydrogen can form two ions
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An atom of hydrogen can form two ions. Write two equations to show how a neutral atom of hydrogen can form two ions. In each case show the sign of energy change involved.
Date posted:
February 2, 2017
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Answers (1)
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Name one property of neon that makes it possible to be used in electric lamps
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Name one property of neon that makes it possible to be used in electric lamps.
Date posted:
February 2, 2017
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Give two reasons why helium is used in weather balloons
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Give two reasons why helium is used in weather balloons.
Date posted:
February 2, 2017
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Answers (1)
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Write the formula of sulphide of an element C, whose atomic number is 5. C is not the actual symbol of the element
(Solved)
Write the formula of sulphide of an element C, whose atomic number is 5. C is not the actual symbol of the element.
Date posted:
February 2, 2017
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Answers (1)
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An element Y has the electronic configuration 2.8.5
(Solved)
An element Y has the electronic configuration 2.8.5
a) which period of the periodic table does the element belong
b) Write a formula of the most stable anion formed when element Y ionises
c) Explain the difference between the atomic radius of element Y and its ionic radius
Date posted:
February 2, 2017
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Answers (1)
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The atomic numbers of phosphorus, sulphur and potassium are 15, 16 and 19 respectively. The formulae of their ions are P3-, S2- and K+. These ions have the same number of electrons
(Solved)
The atomic numbers of phosphorus, sulphur and potassium are 15, 16 and 19 respectively. The formulae of their ions are P3-, S2- and K+. These ions have the same number of electrons
i) Write the electron arrangement of the ions
ii) Arrange the ions in the increasing ionic radius starting with the smallest. Give a reason for the order
Date posted:
February 2, 2017
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Answers (1)
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Why is calcium more reactive than beryllium?
(Solved)
Why is calcium more reactive than beryllium?
Date posted:
February 2, 2017
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Answers (1)
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Write the electronic configuration of calcium (atomic number 20) and beryllium (atomic number 4)
(Solved)
Write the electronic configuration of calcium (atomic number 20) and beryllium (atomic number 4).
Date posted:
February 2, 2017
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Answers (1)
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With reference to atomic number of one, explain why hydrogen can be placed in either group I and VII of the periodic table
(Solved)
With reference to atomic number of one, explain why hydrogen can be placed in either group I and VII of the periodic table.
Date posted:
February 2, 2017
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Answers (1)
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The electron arrangement of ions X3+ and Y2- are 2,8 and 2,8,8 respectively
(Solved)
The electron arrangement of ions X3+ and Y2- are 2,8 and 2,8,8 respectively
a) Write the electronic arrangement of the elements X and Y
b) Write the formula of the compound that would be formed between X and Y
Date posted:
February 2, 2017
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Answers (1)
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A candle wax is mainly a compound consisting of two elements. Name the two elements
(Solved)
A candle wax is mainly a compound consisting of two elements. Name the two elements
Date posted:
February 2, 2017
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Answers (1)
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In an experiment, a piece of magnesium ribbon was cleaned with steel wool. 2.4 g of the clean magnesium ribbon was placed in a crucible and completely burnt in oxygen
(Solved)
In an experiment, a piece of magnesium ribbon was cleaned with steel wool. 2.4 g of the clean magnesium ribbon was placed in a crucible and completely burnt in oxygen. After cooling, the product weighed 4.0 g
a) Explain why it was necessary to clean the magnesium ribbon
b) What observation was made in the magnesium ribbon
c) Why was there an increase in mass
Date posted:
February 2, 2017
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Answers (1)
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When wood is burnt, a grey powder called ash remains. The ash is stirred with water and filtered a colourless solution is obtained
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When wood is burnt, a grey powder called ash remains. The ash is stirred with water and filtered a colourless solution is obtained
a) What is the main component of the colourless solution
b) Explain your answer in (a) above
c) State the observation that would be made if methyl orange indicator was passed through the solution of ash.
Date posted:
February 2, 2017
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Answers (1)
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Name another gas which used together with oxygen in welding
(Solved)
Name another gas which used together with oxygen in welding
Date posted:
February 2, 2017
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Answers (1)
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When magnesium metal is burnt in air, it reacts with both oxygen and nitrogen gases giving a white ash
(Solved)
When magnesium metal is burnt in air, it reacts with both oxygen and nitrogen gases giving a white ash. Write two equations for the reactions that take place
Date posted:
February 2, 2017
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Answers (1)
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(a) Name a suitable solvent for extracting an indicator from flowers (b) Give a reason why the solvent named in (a) above is used
(Solved)
a) Name a suitable solvent for extracting an indicator from flowers
b) Give a reason why the solvent named in (a) above is used
Date posted:
February 2, 2017
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Answers (1)
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Describe how pH of anti-acid (Actal) powder can be determined in the laboratory
(Solved)
Describe how pH of anti-acid (Actal) powder can be determined in the laboratory
Date posted:
February 2, 2017
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Answers (1)