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WorksheetsChemistry Revision Test 2
Total questions: 26
Worksheet time: 30mins
Why does graphite conduct electricity?
Ions are free to move to carry the charge
Atoms can move
Free electrons that can carry the charge
Each carbon is graphite forms _____ bonds
1
2
3
4
Why is graphite so soft and slippery?
It is made of layers of atoms with weak forces between them
It is made of small molecules
It is an ionic compound
The covalent bonds are weak
What type of bonding occurs between metal atoms?
ionic bonding
metallic bonding
covalent bonding
The diagrams show the structures of two forms, P and Q, of a solid element.
A
B
C
D
What is the relative formula mass, Mr, of CaCO3?
Ar Ca: 40, C: 12, O:16
50
68
100
204
The equation shows the reaction between magnesium and sulfuric acid.
[Ar: H, 1; O, 16; Mg, 24; S, 32]
Mg + H2SO4 → MgSO4 + H2
In this reaction, which mass of magnesium sulfate is formed when 6g of magnesium react with excess sulfuric acid?
8
24
30
60
Calcium carbide and water react to produce ethyne and calcium hydroxide. What is the volume of C2H2 in dm3 produced when 45g of water reacts completely? (Ar: H:1, O:16)
72
30
24
6
Calcium carbonate undergoes thermal decomposition to form calcium oxide and carbon dioxide. What mass of CaO, in grams, is formed when 60g of CaCO3 decomposes?
28
18.5
60
33.6
Two atoms of magnesium, Mg, react with one molecule of oxygen, O2.
What is the formula of the product?
A MgO
B MgO2
C Mg2O
D Mg2O2
What is the relative formula mass, Mr, of CaCO3?
A 50
B 68
C 100
D 204
A molecule, Z, contains two atoms of oxygen, six atoms of hydrogen and three atoms of carbon.
What is the formula of Z?
A CH3CH2CHO
B CH3COCH3
C C2H5CO2H
D C3H6CO2H
Methane, CH4, burns in the air to form carbon dioxide and water.
What is the balanced equation for this reaction?
A CH4(g) + O2(g) → CO2(g) + 2H2O(g)
B CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
C CH4(g) + 2O2(g) → CO2(g) + H2O(g)
D CH4(g) + 3O2(g) → CO2(g) + 2H2O(g)
What is the balanced chemical equation for the reaction between calcium and water?
A Ca + H2O → CaOH + H2
B Ca + H2O → Ca(OH)2 + H2
Ca + 2H2O → CaOH + H2
D Ca + 2H2O → Ca(OH)2 + H2
Calcium phosphate contains phosphate ion, PO43-.
What is the formula for calcium phosphate?
(You do not need to subscript the numbers)
(a)
Propane burns in oxygen.
C3H8 + xO2 → 3CO2 + yH2O
Which values of x and y balance the equation?
x = 4, y = 5
x = 5, y = 4
x = 2, y = 4
x = 3, y = 4
A compound has the formula C₆H₁₂O₆.
How should this compound's relative molecular mass, Mr, be calculated?
A. 6(12)+12(1)+6(16)
B. 12+1+16
6 (12+1+16)
6 (12)+12 (1)+16
A formula that shows the smallest whole-number mole ratio of the elements of a compound, and may or may not be the same as the actual molecular formula.
Empirical Formula
Molecular Formula
Stoichiometry
Chemical Reaction
Gives the actual number of atoms of each element in a molecule of a compound.
Empirical Formula
Molecular Formula
Stoichiometry
Chemical Reaction
The table shows the numbers of atoms present in the formula of some compounds.
Which row is not correct?
A
B
C
D
