lab 1 - measuring mass and volume

Question 1

which piece of glassware is most accurate for measuring 10.0mL of water?

Answer 1

a graduated cylinder

Question 2

how do you calculate percent difference when the actual value is unknown

Answer 2

% diff = |Average – worst outlier| / Average * 100

Question 3

what is the main idea of this experiment?

Answer 3

learn how to use lab equipment (balances, beaker, cylinders, bottle top dispensers)

Question 4

why is it important to use weighing containers? (like beakers or weighing dishes)

Answer 4

using containers protects the balance and ensures accurate measurements

Question 5

what is the importance of reading the meniscus?

Answer 5

the meniscus is the curved surface of a liquid in a container. for accurate volume measurement, you must read the bottom of the meniscus at eye level

Question 6

why do different pieces of glassware (beakers, graduated cylinders, bottle top dispensers) have different accuracies?

Answer 6

graduated cylinders and bottle top dispensers are more accurate because they have finer calibrations than beakers. beakers have larger mL gaps (10mL, 20mL)

Question 7

true or false - it is important to use the same balance for all measurements in one part of the experiement

Answer 7

true

Question 8

what is the formula for density of water?

Answer 8

density = mass/volume

Question 9

what is an outlier?

Answer 9

datapoint that is significantly different from other values in the dataset. identifying outliers help us determine if there were errors in the experiment

Question 10

what accuracy level should you achieve when weighing solids?

Answer 10

solids should be dispensed within +-10mg of the required value

Question 11

what is a big lesson from this experiement

Answer 11

not all solids may come out of the beaker when transferring

Question 12

true or false - water is not a hazardous substance or mixture

Answer 12

true

Question 13

true or false - sand is not a hazardous substance or mixture

Answer 13

true