C4( Chemical Calculations) Flashcards
What is the formula that relates moles mass and Mr
What is Avogadro constant
6.02 X 10^23 per mole
What is a limiting reactant
The reactant that gets used up first in a reaction(this is not the excess reaction)
What is the method to work out the limiting and excess reactant and mass of a element in a reaction
Step1= find the number of moles of known substance
Step2= use the balanced equation to find ratio between known substance and unknown substance(using theoretical moles)
Step3= find the mass of the unknown substance
What is the formula for percentage yield
What are the factors affecting percentage yield
-The reaction may be reversible
-Some reactants may react to give unwanted products
-The reactions may not be pure
-Some of the products may be lost in handling or left in the apparatus
-Some of the desired product may be lost during its extraction from the mixture
What is the formula for atom economy
What is the formula for concentration
What is titration
Titration is used to measure what volumes of acid or alkali needed to neutralise an acid or an alkali
Example of TITRATION, PERCENTAGE YIELD, ATOM ECONOMY AND VOLUME OF GASES calculations
Go to GCSE youtube account and go to the titration playlist
What is the volume of 1 mole of any gas at room temperature and pressure
24 dm^3
How many centimetres in a decimetre
1000cm^3 = 1dm^3
How to work out number of moles of gas
What is the formula triangle for volume of gas
V= volume
m= moles
24= the volume of 1 mole of any gas
What is the formula that relates actual mass theoretical mass and percentage yield
What is the formula that relates theoretical mass actual mass and percentage yield
What is the method for titration
