FORMULAS NEEDED TO KNOW Flashcards
1
Q
What is the ideal gas equation
A
Pv=nRT
2
Q
What is atom economy equation
A
(Mr of desired products/ Mr of all products) x 100
3
Q
Moles equation
A
Mol= mass/Mr
4
Q
Percentage yield formula
A
(Actual Yield / Theoretical Yield) x 100
5
Q
Number of particles equation
A
moles x 6.022x10’23
6
Q
How to calculate energy change
A
q = mcΔT
7
Q
What is enthalpy change per mole
A
q/moles
8
Q
What is empirical formula
A
simplest whole number ratio of elements in a compound
9
Q
What are titrations used for
A
to calculate conc of acids and alkalis
10
Q
What is a mole
A
way of measuring the amount of a substance in chemistry
11
Q
what is atom economy
A
how efficient a reaction is
12
Q
Titration experiment
A
- Have an acid or alkali in burette with known concentration.
- Have an acid or alkali with an unknown concentration but known volume in conical noun . Add a few drops or indicator two .
- Add the chemical on the burette to the conical flask and the indicator changes colour . This is is known at the end point .
- Read how much chemical was added from the burette to neutralised the chemical in the conical flask. Read the bottom of the meniscus . Always read at eye level.
- Records your results to 2 decimal places and repeat until you get 2 results that are concordant ( within 0.10cm3 or each other).
