IPS Quiz #1 Study Guide
Wednesday 9/18
Lab Safety
Nurse Extension
Chemicals
4. avoid touching chemicals 5. always wash hands with soap and water after lab
6. if chemicals touch skin: flush skin for 1 minute and notify Mr. Leeds
Glass
3. tell Mr. Leeds and dispose of broken glass in proper trash
4. never use force to remove or insert glass
Alcohol Burners
3. never point the open end of a hot test tube at yourself or someone else
4. don't look down into a test tube/beaker while its being heated
5. Make sure burner is capped and flame is out when done
Safety Equitment
End of Experiment
3. keep googles on until Mr. Leeds says to put them away
Lab: Reaction in a bag
Red liquid
Ph Scale - measures acidity -> goes from 0-14 (0-6 = acid) (8-14 = alkaline) (7 = neutral)
2 Solids
Uses: canned veggies ->keeps from getting mushy/electrolyte is sports drinks/flavors pickles -> slaty flavor
Solid B: Sodium bicarbonate (baking soda) --not acidic
Uses: baking, toothpaste, laundry detergent, etc...
Lab: Heating Baking Soda
--water is pushed out of bottle --if you heat an empty test tube than the bottle doesn't fill with gas and retains its water -- gas is leaving test tube (gas comes from baking soda)
--condensation comes from the baking soda (hot gas touches cooler top of test tube and turns bak into liquid -- They substance in the heated and not heated test tubes are different because they are different colors (heated is darker) and the baking soda dissolves in the heated
--control group = not heated baking soda + tea --experimental group = heated baking soda + tea --indicator = tea (showed the heated baking soda was different substance)
--variables = independent = heat/dependent = tea color
--control factors = same type of tea/same amount of tea/same amount of Baking soda/same size test tube
Experimental errors
Stopper not snug - won't see gas being produced
not clean stirring rod - contamination
Volume
Volume of liquids = (1 mL = 1 centimeter cubed)/ use a graduated cylinder **always check interval of graduated cylinder
Volume lab
100 mL -> 1 mL
Nickel = 5.030g/ Binder-clip = 8.860g/ Big stopper = 17.268g/ Small stopper = 7.266g