Lab 1- Basic Laboratory practices

Question 1

Eye protection

Answer 1

Must always be worn with shatterproof lenses and side shields

Question 2

Chemicals

Answer 2

Consider them all hazardous unless you are instructed otherwise

Question 3

Acids and water

Answer 3

Always pour acids into water, and never water into acids

Question 4

Inserting a tube into a stopper

Answer 4

Lubricate the tube and the stopper’s hole. Holding the rod with a paper towel twist it in and remove excess lubricant

Question 5

Ring stand orientation

Answer 5

The long edge should be perpendicular to the front of the bench

Question 6

Recording sheets

Answer 6

Record answers on sheets immediately and independently.

Question 7

Cleaning up excess

Answer 7

Never return extra reagents to the initial reagent bottle

Question 8

Stoppers

Answer 8

Hold the stopper in your hand instead of putting it on the counter

Question 9

Water

Answer 9

Used distilled water unless instructed otherwise

Question 10

Apparatus

Answer 10

Should never be shared between people

Question 11

Ideal temperature

Answer 11

Room temperature unless stated otherwise

Question 12

Proper clothing

Answer 12

Nothing with baggy or loose sleeves

Question 13

Hot plates vs bunsen burners

Answer 13

Use a hot plate whenever possible

Question 14

Metric system

Answer 14

Was originally based mainly upon fundamental properties of water because it is one of earth’s most abundant substances

Question 15

Metric units date

Answer 15

1960 was the international agreement

Question 16

SI System stands for

Answer 16

The international system of units

Question 17

Conversion factors and magnitude

Answer 17

Conversion factors have no affect on magnitude

Question 18

Common scales for modern labritories

Answer 18

Single-pan balances

Question 19

Graduated cylinders

Answer 19

Tall, cylindrical vessels with graduations scribed on the side. Measure volume

Question 20

Graduated cylinders best shape

Answer 20

Tall with a small diameter for the best accuarcy

Question 21

Thermometers

Answer 21

Based upon the principle that liquids expand when they are heated. Mercury or colored alcohol.

Question 22

1 atm

Answer 22

760 mm Hg (1 torr)

Question 23

Pipets

Answer 23

Deliever a precisely known volume of a liquid at a given temperature. Always use a rubber bulb when handling

Question 24

Every measuring device

Answer 24

Has its limitations on its accuracy. Make sure to obtain the information to the highest level of accuracy

Question 25

Using a graduated cylinder

Answer 25

Measure from the lowest point on the meniscus at eye level. Read to the closest 0.1 mL

Question 26

Density units

Answer 26

Solid: g/cm^3, Liquid: g/mL Gases: g/L

Question 27

Precision

Answer 27

Is a statement about the internal agreement among repeated results. How reproducible it is

Question 28

Arithmetic mean

Answer 28

AKA average. The results is usually taken as the best value