Chemistry Practicals Meanings: Flashcards
1
Q
What is accuracy ?
A
= how close the measurement is to the true/correct value
2
Q
What is precision?
A
= how reproducable a measurement is
= (how often the occurence is).
3
Q
What are the 2 reasons for uncertainty?
A
= systematic error
= random error
4
Q
What is a systematic error?
A
= same error in every measurement
= due to the limitations of equipment
5
Q
What is a random error?
A
= error that is different every time
= due to scientist
6
Q
What does precision mean?
A
= smallest change in quantity
= half of precision is error
7
Q
How do we calculate the percentage error of a value?
A
= accepted value - experimental value /
accepted value
8
Q
How do we calculate the percentage error of a equipment?
A
= maximun erorr/ measured error x 100
