Unit Two Flashcards
Define beaker
A wider container with a flat bottom and graduations.
What’s a capillary tube
A very narrow small glass tube that’s open on both sides
Define flask
A mountain shaped vessel at the bottom and a tube like thing attached at the top. Graduations
Define superheating
When something is heated at a higher temperature than it’s boiling point without boiling yet. Very dangerous and could cause explosions. Use things called boiling chips to prevent it
Define supercooling
When something dips below its usual freezing point but hasn’t started freezing yet
What are characteristic property’s and some examples of them?
Properties that can be used to identify substances that remains unchanged by the amount of the substance. Ex. Boiling point, melting point, freezing point, density.
How do you find the percent error?
Exp. - theor. Divided by theoretical x 100
Describe procedure for lighting Bunsen burner
Open the side valves, make the black rubber part barely poke out, turn on gas, light match and light burner holding the match horizontally NOT vertical
What is the definition of boiling point
Boiling: temperature when liquids vapour pressure is equal to the surrounding air pressure.
The temperature at which a liquid boils and turns to vapour
Experimental set up for:
Micro boiling experiment
Micro melting experiment
MB: put a thermometer and test tube in a beaker of water attached to peg board over a Bunsen burner. Place a capillary tube with closed end facing up into the test tube. When you see bubbles shooting out of capillary tube into the test tube, you are done
Micro melting: put whatever chemical you are testing into the capillary tube. You want as little as possible but still being able to see it. Attach the capillary tube to the thermometer. Put it into hot water bath over Bunsen burner until the chemical melts and you cannot see it anymore.
Formula for finding density
D= mass divided by volume
