SC6ii - FERTILISERS + CELLS Flashcards
1
Q
mineral ions needed by plants (3)
A
- nitrogen
- phosphorus
- potassium
2
Q
mineral ions (NPK) are supplied to plants in soluble compounds ___ or ___
A
ammonium sulphate ((NH4)2 SO4)
ammonium nitrate (NH4NO3)
3
Q
we can make ammonium sulphate in the lab on a small scale, batch process by doing a titration of _______ and ________ ____
A
ammonia and sulphuric acid
4
Q
a battery is …
A
- a chemical cell
- consists of 2 metals in solutions of their metal ions and a salt bridge to allow ions to flow from one solution to the other
5
Q
batteries go flat because …
A
one of the reactants is used up and a voltage is no longer produced
6
Q
a fuel cell is …
A
- an electrochemical cell
7
Q
what happens in a fuel cell?
A
- fuel is supplied to one electrode and oxygen supplied to the other
- the fuel is oxidised electrochemically (not burnt) and as long as fuel and oxygen are supplied electricity is made
8
Q
products of a hydrogen fuel cell
A
- water and electricity
- NO carbon dioxide is made
