Guide to Everything I Need to Know
Quiz 1 Study Guide
3 Basic Things (that are pretty obvious)
1) Wear your Goggles!
2) Report ALL Accidents to Mr. Leeds...
3) Just use your COMMON SENSE.
Three Safety things (hint, hint, equipment)
FYI: The number to the nurse's office is 2828
Back to Common Sense- What to do with Glass
Yeah.. Hot glass and cold glass look the same.
No- Don't use the force (or any force) when handling glass!
If this happens...
What to do with fire...
The obvious:
Burners...
Striking Matches!
On to the Reaction in a Bag Lab...
Phenol Red:
1. It is used as a pH indicator
2. The pH turns yellow when it is acidic and pink when it is basic.
Calcium Chloride (Solid A)-
1. Mildly acidic
2. Hydro-tropic or attracted to water. The opposite of that is hydrophobic.
3. Uses:
a. Canned veggies- keeps them from getting mushy
b. Electrolytes is sports drinks
c. Salty pickle flavors
Sodium Bicarbonate (Solid B)-
1. Slightly basic
2. Uses:
a. Baking soda
b. Hence- baking
c. Toothpaste
d. Laundry detergent
e. Cat litter
*By the way- the phobia of Friday the 13th is called paraskavedekatriaphobia. Just thought it was a cool fact I'd throw out there.*
Experiment error:
Now on to the Heating Baking Soda Lab...
At the bottom of the test tube...
The baking soda came up the test tube a bit... Not much more happened...
At the top of the test tube...
There is condensation and it gets kind of foggy. The condensation comes from the baking soda's creating a gas, which goes up, cools down, and precipitates.
In the bottle/container...
Air that comes from the heated baking soda goes through the rubber tube and fills the bottle, making a huge air bubble as all the water goes into the container.
Heated vs. unheated
If it's a different color, it's a different thing.
Good to know:
- The Control Group (what we controlled)- unheated baking soda
- The Experimental Group (what we didn't control)- heated baking soda
- Indicator- tea, because it showed the color change
- Variable- something you try to measure
- Independent variable- causes a change in dependent variable (heat)
- Dependent variable- depends on independent variable (color of tea)
- Control factors-
a. Same type of tea
b. Same amount of tea
c. Same amount of baking soda
d. ETC...
Experimental Errors:
2. There is a hole in the bottle/tubing- water/gas will leak out.
Volume notes:
2. Standard unit of length: meter
3. Liquids- use graduated cylinder
4. *Always check interval/scale
5. *mL = cubic centimeter*
6. Read from bottom of the meniscus
Balance Notes:
2. Zero balance every time
3. Never switch pans
4. Don't zero balance at the end.
5. Pick up only by red bar (if needed).