Q1: A) C2H4 + H2 C2H6
B) 2KBr + CL2 2KCL + Br2
C) AL3+ + 3e- Al
D) Glucose Ethene + Carbon Dioxide
E) 6CO2 + 6H2O C6H12O6 + 6O2
F) N2 + 3H2 2NH3
G) Calcium carbonate Calcium oxide + carbon dioxide
H) C10H22 C8H18 + C2H4
I) 2SO2 + O2 2SO3
J) C6H12O6 + 6O2 6H2O + 6CO2
State the alphabet of following in which:
(i) Reaction occurring in Blast furnace
(ii) Uses vanadium catalyst
(iii) Cracking takes place
(iv) Photochemical reaction
(v) is Heber’s Process?
(vi) Displacement reaction
(vii) Requires yeast?
(7 marks)
Q2: A) From periodic table
(a) element used in overhead cables due to low density:
(b) is in group vii period 4:
(c) has exactly 23 protons:
(d) used to kill bacteria in water:
(e) makes roughly 78% of air:
(f) has an oxide that makes slag:
6-marks
B) (i) Explain in terms of protons and neutrons what are isomers. (2)
(ii) an element has 3 naturally occurring isotopes with the relative abundance
82
24
10
25
10
26
Calculate RAM.
(2)
Q3: Ionic compound MgF2
(i) Complete dot an cross, show outer shell only
F
Mg
F
F
Mg
F
(3-marks)
(ii) Why does MgF2 have a high melting point?
(2-marks)
(iii) Why does MgF2 conduct electricity when it is in molten state?
(1)
b) (i) fluorine covelantly bonds to another fluorine molecule. Draw the dot and
Cross structure of this bond, show outer electrons only. (2)
(ii) F2 melts at -220*C, and boils at (idk lol), what state is it at -240*C, give reason
for your answer. (2)
Q4 H2O2 decomposes to form water and oxygen.
a) write a symbol equation for this reaction, include state symbols. (3)
b) Define the term catalyst. (2)
c) (i) why is rate of reaction greatest at the start? (1)
(ii) why does the rate of reaction eventually stop? (1)
d) why does rate of reaction decrease when les temperature is used? (3)
Q5
Dilute NaCl is broken down by the passage of electricity. Na anode, H cathode
a) (i) name this process(1)
(ii) give 2 reasons why graphite electrodes used.(2)
(iii) write the ionic equation of hydrogen forming at cathode.(2)
(iv) Why is oxygen produced at anode? (2)
(v)which particles are responsible for carrying charge in wire in external circuit(1)
(vi) Concentrated NaCl has electricity passed through it, what is produced at
cathode and anode now? (2)
b) (i) Name the ore of aluminum.
(1)
(ii) name the compound of aluminum in this ore.
(1)
(iii) what is the compound of aluminum dissolved in while aluminum is being
extracted?
(1)
(iv) Why do the carbon electrodes have to be replaced frequently? (2)
Q6: a) Zinc Oxide reacts with both acids and bases.
(i) name this type of oxide.
(1)
(ii) Zinc reacts with sodium hydroxide to form (I didn’t write ts down…)
Write the formula of this compound.
(1)
(iii) Zinc Oxide reacts with dilute sulfuric acid.
Write the symbol equation for this reaction, add state symbols. (2)
(iv) Barium Chloride reacts with Zinc Sulfate to form Barium Sulfate.
Write the Ionic equation for this reaction and add state symbols. (2)
(v) what is the color of the precipitate formed in (iv)?
(1)
b) (i) 4K2Cr2O7 4K2CrO4 + 2CrO3 + 3O2
11.76g of 4K2Cr2O7 reacts to form 4K2CrO4, 2CrO3, & 3O2.
What’s the mass of 2CrO3 produced?
(Mr’s given for both)
- Number of moles of 4K2CrO7 produced
- Number of moles of 2CrO3 produced
- mass of 2CrO3 produced.
(3-marks)
(ii) what does (vi) stand for in potassium chromate(vi) ?
(2)
(iii) potassium chromate is orange, which element gives it this color? (1)
c) N2O4 2NO2, forward reaction is endothermic. Fill in the blanks, using the
words: Increases, decreases, & no change.
Change done.
Effect on equilibrium conc. Of 2NO2
Pressure inc.
_____________________________
Temp dec.
_____________________________
Catalyst is used
_____________________________
(3)
Q7. a) (i)what is hydrocarbon? (1)
(ii) 2 characteristics of homologous series.
(2)
(iii) give the formula of alkane that has 10 carbons.
b) (i)What is photochemical reaction?
(1)
(1)
(ii) give the name of 2 isomers of hydrocarbon with formula C3H7 (2)
c) (i) what is the empirical formula of the general formula of alkenes. (1)
(ii) name 2 unbranched alkenes having 4 carbon atoms. (2)
(iii) show 1 repeating unit of addition polymer formed from propene (3)
I
I
C
C
I
I
0
