Please select a subject first
Advertisements
Advertisements
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
Concept: undefined >> undefined
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2,8,1 |
2,8,7 |
2,5 |
1 |
Answer the following questions based on the table above:
What is the formula of the compound formed between X and Z.
Concept: undefined >> undefined
Advertisements
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2, 8, 1 |
2, 8, 7 |
2, 5 |
1 |
Answer the following question based on the table above:
What is the formula of the compound formed between W and X.
Concept: undefined >> undefined
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is
Concept: undefined >> undefined
State the type of bonding in the following molecule.
Calcium oxide
Concept: undefined >> undefined
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
Concept: undefined >> undefined
Define the following term:
Efflorescence
Concept: undefined >> undefined
Define the following term:
Hygroscopy
Concept: undefined >> undefined
Define the following term:
Water of crystallization
Concept: undefined >> undefined
What is deliquescence? What name is given to the compounds exhibiting such property?
Concept: undefined >> undefined
Give four substances which contain water of crystallization and write their common name.
Concept: undefined >> undefined
Fill in the blank
___________ is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.
Concept: undefined >> undefined
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
Concept: undefined >> undefined
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
Concept: undefined >> undefined
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
Concept: undefined >> undefined
Answer the following questions below, relating your answers only to salts in the following list:
Sodium chloride, anhydrous calcium chloride, copper sulphate-5-water.
(i) What is the name given to the water in the compound copper sulphate-5-water?
(ii) If copper sulphate-5-water is heated, the water is driven off leaving anhydrous copper sulphate. What is the colour of anhydrous copper sulphate?
(iii) By what means, other than heating, you can dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?
(iv) Which one of the salts in the given list is deliquescent?
Concept: undefined >> undefined
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Concept: undefined >> undefined
State what would you observe when :
The salt ferric chloride is exposed to the atmosphere.
Concept: undefined >> undefined
Write the colour of the following salts: Cuprous salts.
Concept: undefined >> undefined
Write the colour of the following salt : Cupric salts.
Concept: undefined >> undefined
