Module 1 - practical + research skills

Question 1

New conc =

Answer 1

previous conc x vol. from previous solution / Total vol of new solution

Question 2

when calculating SA:V, which should be 1

Answer 2

Volume

Question 3

Faulty instruments or flaws in the experimental method produce …………… that are repeated consistently every time the instrument is used or the method is followed

Answer 3

systematic errors

Question 4

Unexpected environmental changes or incorrect use of equipment can produce ………. that are different every time the experiment is carried out, e.g. a breeze blowing during a potometer experiment may not blow at the same speed throughout the experiment

Answer 4

random errors

Question 5

It is a very common mistake to confuse precision with accuracy. Precision refers to the ability to take multiple readings that are close to each other, whereas accuracy is the closeness of those measurements to the true value. Measurements can be precise but not accurate if each measurement reading has the same error.