1C Jan 2014 Flashcards
What makes up 0.96% of the air?
Argon.
Use for nitrogen?
in Haber Process.
Why use ethanol over water?
Ethanol is a better solvent.
2 observation when CO2 is bubbled through limewater?
Limewater goes milky, mixture goes clear.
C2H6+Br2 ->
2H5Br + Hbr
What type of reaction is the one between ethane and bromine?
Substitution
Exothermic?
Releases thermal energy.
Why does magnesium oxide have a very high melting point?
Positively and negatively charged ions, strong attractions between oppositely charged ions. Giant structure, large amounts of energy required to separate the ions.
In terms of particles, why does an increase in temperature increase the rate of a reaction?
Average kinetic energy of particles increases so particles reach activation energy required for more successful collisions more frequently.
Why is titanium good for aircraft engines?
High strength-to-weight ratio.
Why is titanium good for hip replacements?
Non-toxic.
Why is titanium good for propellers?
Corrosion resistant.
Two features of dynamic equilibrium?
Both forward and backwards reactions are occurring. Rate of forward reaction = rate of backwards reaction.
-kJ/mol, endo or exo?
Exothermic.
Methanol into methanal?
2CH3OH + O2 -> 2H2CO + 2H20
