Unit 3 - Getting the most from reactants Flashcards
What is a feedstock
A chemical other chemicals can be extracted or synthesised from
What is a raw material
A substance found naturally in the earths crust or atmosphere
What is the formula for number of moles when given molar volume
n = V/Mv
When is water included in gas volumes equations
When stated as gaseous or temperature above 100°C
What happens when NaOH is added to a gas volume mixture containing CO2 in a gas mixture question
CO2 must be removed from gas mixture
What’s the higher method for basic mass or volume calculations
- Theoretical ratio
- Calculate moles for given value(s)
- Apply moles found to ratio
- Calculate what is asked in question
What is the value for molar volume
22.4 litre mol-1
What are the steps for gas volume questions
- Write volume ratio for all necessary
- Find limiting reactant (completely used up)
- Find left over gas accordingly
What are the steps for percentage yield questions
- Find theoretical mass produced
- Use actual value given
- Apply to formula
What are the steps for atom economy questions
- Find GFMs for all reactants
- Find GFMs for product(s)
- Apply to formula (REMEMBER BIG NUMBERS)
What are the steps for limiting/ excess reactants
- Find moles for chemicals asked
- THEORY HAVE NEED
