When should goggles be worn?
Anytime anyone is doing a lab
When is it safe to eat in the lab?
Never
After you use a bottle of chemical
Put it away in the proper location
While carrying out an experiment, you should wear
goggles, lab coat, pants, closed toed shoes
What do you do with extra chemicals poured out?
Pour them in a trashcan
Broken glass goes
in the broken glass box
What do you do if you cut yourself
tell the instructor
What do you use to neutralize hydrochloric acid?
baking soda
hydrochloric acid in the eye
eye wash station and tell the instructor
Light yourself on fire
Use safety shower to put out the flames
Beaker
Glass cup with various volumes
Wash bottle
Squirt bottle
Graduated cylinder
measures volume of liquids
Stirring rod
Glass rod
Striker
Lighter
Crucible tongs
Picks up hot things
Hydrometer
Measures specific gravity
Erlenmeyer flask
Chem lab looking beaker
Buret
Measures a chemical being dispensed
Rules for sig figs
Division/Multiplication: least amount of # of valid digits
Addition/Subtraction: Least amount of decimals
How to measure length
Read between the lines. Always one estimated digit.
How to measure volume
Read between the lines. Always one estimated digit.
Determine the volume of a solid two ways:
Measurement (LxWxH) cm^3
Volume displacement
Density
volume
Specific gravity
Equals density
No units
Read specific gravity
From a hydrometer
Calculate percent error
|Approximate Value − Exact Value|
——————————————– × 100%
|Exact Value|
Electron dot structures
Dont pair dots unles there are more than 4 valance electrons