exam revision Flashcards
What type of reaction is bromine water and alkane
subsutation
what type fo reaction is bromine water plus alkenes
addition
what colour is bromine water
orange
When methane reacts with bromine, one of the products is hydrogen bromide.
(i) State a condition needed for this reaction.
(ii) Name the organic product of the reaction
Uv light
Bromomethane
Write a chemical equation for the reaction between ethane and bromine.
Ethane + bromide - bromoethane + hydrogen bromide
a) Write a chemical equation for the decomposition of hydrogen peroxide.
Hydrogen peroxide > oxygen + water
2h2o2 > 2H2O+ o2
Manganese(IV) oxide is a catalyst for this reaction.
State and explain the effect of a catalyst on the rate of this reaction.
It speeds up the rate of reaction as it provides an alternate pathway to a lower activation energy
State what the symbol ΔH represents.
Enthalpy change
The student notices that at the end of the experiment the bottom of the beaker is covered in black soot (carbon).
Incomplete combustion
Explain how the formation of the soot may account for the difference between the value of ΔH from the experiment and the value of ΔH in the data book.
Less heat energy produced
Suggest one other reason why the two ΔH values are different.
Heat is loss to the air, water evaporates
complete combustion
hydrocarbon + oxygen → carbon dioxide + water = complete combustion
incomplete combustion
hydrocarbon + oxygen →carbon + carbon monoxide + water
Biodegradable
polymer is broken down by micro-organisms
dentify the property that prevents addition polymers from easily biodegrading.
it is inhert
