Topic 5- Seperate Chemistry 1 Flashcards
Where on the periodic table are transitions metals?
They sit in the middle of the periodic table
Properties of transition metals
- hard,strong and malleable
- conduct heat and electricity well
- have high densities
- have typical properties of metals
Alloys
- made by adding another element to a metal
* alloys are used instead of pure metals as metals are malleable due to their regular arrangement of identical atoms
Corrosion
The process where something is slowly damaged or destroyed by a chemical process
How do you prevent corrosion (rusting)?
You can prevent rusting by coating the metal with a barrier, this keeps water and oxygen out
- painting (for larger areas eg. Buildings)
- oiling or greasing moving parts
Titration
•are used to find out exactly how much acid is needed to neutralise a given quantity of alkali (or vice versa)
The flask underneath the titrate will have the acid you’re trying to neutralise containing an indicator (methyl orange or phenolphthalein)
Take a measurement of how much you start with in the titrate and then add the acid until the indicator changes colour
Equation for percentage yield
Percentage yield= actual field/ theoretical field x100
Equation for atom economy
Atom economy= total Mr of desired products/ total Mr of all products x100
Haber process
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What are the 3 main elements in fertilisers?
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What are the methods to prepare ammonium sulphate?
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Equation for molar volume
Molar volume= gas volume ÷ number of moles
Fuel cell
- use fuel and oxygen to produce electricity
- more efficient than power stations or batteries at storing electricity
- no greenhouse gases
Equation for concentration
N (moles
————————————
Concentration x Volume
