1.2.2(a) use of appropriate apparatus to record a range of quantitative measurements (to include mass, time, volume, temperature, length and pH)

Question 1

how to work out volume?

Answer 1

Volumes might be directly measured with gas syringe

or inverted measuring cylinder, inverted burette or a pre-calibrated potometer capillary

or might be derived using linear measurements (length and diameter) and the appropriate formula.

Question 2

what should you do before measuring mass?

Answer 2

the tare facility should be used to zero the balance

Question 3

what should you use to weigh solids and a weighing bottle to weigh liquids.

Answer 3

disposable weighing boat

Question 4

how to accurately measure mass

Answer 4

. The weighing boat or bottle should be weighed before materials are added and weighed again after they have been emptied into another container so that an accurate mass of the material used can be found by subtraction of masses.

Question 5

, if not using data loggers what should time be rounded to?

Answer 5

time should be measured to the nearest whole or 0.5 of a second due to human reaction time.

Question 6

how to minimise parallax error

Answer 6

the mark on the apparatus should be at eye level

Question 7

good alternatives to a glass trough

Answer 7

A washing up bowl or ice cream container

Question 8

what should you do to allow a delivery tube to be moved into place.

Answer 8

When an inverted burette or measuring cylinder is clamped over water, there should be sufficient space between the open end of the burette and the bottom of the water container to