IPS Quiz #1 Study Guide

Wednesday 9/18

Lab Safety

Nurse Extension

2828


Chemicals

1. Never taste them 2. Always waft liquids to detect odor 3. never waft solids/powders

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

1. hot glass and cold glass look the same 2. never use chipped or broken glass

3. tell Mr. Leeds and dispose of broken glass in proper trash

4. never use force to remove or insert glass


Alcohol Burners

1. Roll up sleeves and put up long hair 2. never walk away from a lit burner


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

1. clean up area and materials completely 2. make sure burner is out if used


3. keep googles on until Mr. Leeds says to put them away

Lab: Reaction in a bag

Red liquid

Phenol red - Used as ph indicator -> below 7 turns yellow/above 8 turns pink

Ph Scale - measures acidity -> goes from 0-14 (0-6 = acid) (8-14 = alkaline) (7 = neutral)

2 Solids

Solid A: Calcium chloride (calcium+chlorine) --acidic --hydrotropic = (absorbs water or attracted to water) **most salts are hydrotropic (sodium)**


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

--Baking soda doesn't change that much --moisture at top (condensation), misty, foggy

--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

Hole int tubing - won't see gas being produced


Stopper not snug - won't see gas being produced

not clean stirring rod - contamination

Volume

Unit of measurement = centimeters cubed


Volume of liquids = (1 mL = 1 centimeter cubed)/ use a graduated cylinder **always check interval of graduated cylinder

Volume lab

Graduated Cylinders -> intervals: 10 mL -> 0.2 mL/ 25 mL -> 0.5 mL/ 50 mL -> 1 mL/

100 mL -> 1 mL

Nickel = 5.030g/ Binder-clip = 8.860g/ Big stopper = 17.268g/ Small stopper = 7.266g