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Use the information in the Table to answer the questions that follow.
asked
Jun 21, 2021
in
Chemistry Form 3
alkanes
separation of mixtures
organic chemistry
miscibility
0
votes
1
answer
Some compounds such as CFCs and DDT are regarded as environmental pollutants. Give the complete names of
asked
Jun 21, 2021
in
Chemistry Form 3
chlorine compounds
environmental pollution
0
votes
2
answers
Methane reacts with bromine as shown in the following equation. CH4(g) + Br2(g) → CH3Br(g) + HBr(g) Using the bond energies in the Table, calculate the enthalpy change, ΔH for the reaction.
asked
Jun 21, 2021
in
Chemistry Form 4
chemical reactions
enthalpy notation
moles
bond formation
bond breaking
0
votes
1
answer
peroxide decomposition Sodium carbonate is prepared on large scale by the Solvay process. The equation for the main reaction that takes place in the carbonator is: NaCl(aq) + NH3(g) + CO2(g)+ H2O(l) → NH4Cl(aq) + NaHCO3(s)
asked
Jun 21, 2021
in
Chemistry Form 2
solvay process
production of sodium carbonate
by-products
carbon
0
votes
1
answer
The Figure shows an energy level diagram for the decomposition of hydrogen peroxide using a catalyst
asked
Jun 21, 2021
in
Chemistry Form 4
energy changes
energy level diagrams
chemical reactions
decomposition
0
votes
1
answer
Nitrogen(IV) oxide is prepared by heating lead(ll) nitrate.
asked
Jun 21, 2021
in
Chemistry Form 3
nitrogen and its compounds
nitrogen (iv) oxide preparation
tests
chemical equation
0
votes
1
answer
Study the information in the table and answer the questions that follow. The elements belong to the same chemical family. (The letters are not actual symbols of the elements)
asked
Jun 21, 2021
in
Chemistry Form 2
periodic table
metals and non-metals
pattern in properties
chemical family
0
votes
1
answer
Excess dilute hydrochloric acid was added to an alloy of copper and zinc in a beaker.
asked
Jun 21, 2021
in
Chemistry Form 4
metals
zinc
properties of metals
alloys
0
votes
1
answer
When chlorine is bubbled through hot concentrated sodium hydroxide solution, sodium chlorate(V), sodium chloride and water are formed.
asked
Jun 21, 2021
in
Chemistry Form 2
salts
preparation of salts
solubility
sodium
0
votes
1
answer
The Figure below shows a reaction scheme starting with copper turnings. Study it and answer the questions that follow
asked
Jun 21, 2021
in
Chemistry Form 3
chemical reaction scheme
sulphur and its compounds
sulphuric acid properties
0
votes
1
answer
State the difference between a covalent bond and a dative covalent bond.
asked
Jun 21, 2021
in
Chemistry Form 2
structure and bonding
covalent
illustration
electron sharing
0
votes
1
answer
Draw a labelled diagram of the setup of apparatus that can be used to electrolyse lead (ll) bromide.
asked
Jun 21, 2021
in
Chemistry Form 4
electrochemistry
electrolysis
electrochemical cell
0
votes
1
answer
The table shows pH values of solutions of compounds D, E. F and G
asked
Jun 21, 2021
in
Chemistry Form 3
chlorine
nitrogen
compounds
amphoteric oxides
0
votes
1
answer
Draw the structural formula of 2-methylbut-2-ene.
asked
Jun 21, 2021
in
Chemistry Form 3
structural formula
organic chemistry
alkenes
isomerism
0
votes
1
answer
Carbon(II) oxide was passed over 4.1g of heated oxide of copper in a combustion tube until there was no further change. The mass of the final substance was found to be 3.29g
asked
Jun 21, 2021
in
Chemistry Form 3
the mole
molar mass
properties of carbon monoxide
0
votes
1
answer
State and explain the factors that are considered when collecting a gas by displacement of
asked
Jun 21, 2021
in
Chemistry Form 1
composition of air
reaction
compostition of water
displacement
collection
0
votes
1
answer
Study the setup in the Figure below and then answer the questions that follow.
asked
Jun 21, 2021
in
Chemistry Form 2
carbon
preparation and properties of carbon (iv) oxide
reactions
0
votes
1
answer
Element A has mass number 40 and 21 neutrons
asked
Jun 21, 2021
in
Chemistry Form 2
structure of the atom
periodic table
electron arrangement
formula
0
votes
1
answer
The diagram below illustrates a set of biological processes in a green plant
asked
Jun 21, 2021
in
Biology Form 1
nutrition in plants
photosynthesis
anaerobic respiration in plants
0
votes
1
answer
Explain why an individual with blood group AB can only donate blood to an individual with the same blood group.
asked
Jun 21, 2021
in
Biology Form 2
blood groups
genetics
blood transfusion
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