Uncertainties and reacting masses Flashcards
What is a procedural uncertainty?
An uncertainty to do with the experimental method
What is a measurement uncertainty?
An uncertainty to do with measurements
What is the equation for percentage uncertainty?
% uncertainty = (total uncertainty / actual measurement) x 100
What is the relationship between size of measurement and uncertainty?
The greater the measurement, the lower the uncertainty
When does an uncertainty occur?
Each time a measurement is made
What is total uncertainty?
The number of measurement made x uncertainty per reading
What are examples of equipment where you need to double to uncertainty per measurement?
Burette, balance etc
What are examples of procedural errors with the anhydrous salts experiment?
Overheating causing decomposition (producing sulfate dioxide gas), solid spitting out of crucible during heating, soot from flame getting on crucible and some water being reabsorbed when cooling.
What does EMMA stand for?
E - equation - write balanced equation
M - moles - calculate moles of known product.
M - moles - calculate moles of unknown product
A - answer - convert number of moles to your answer
