I.P.S Quiz #1 Study Guide
1.1-1.4, Safety, Reaction In a Bag
Safety Information
-For Every Lab-
- Goggles must be kept over your eyes until Mr. Leeds says to put them away even if you have finished and cleaned up
- Report all accidents/spills to Mr. Leeds immediately.
- Please try to use common sense
-In Case of Emergency-
- Nurse Extension: 2828
-Safety Equipment
- Fire Extinguisher
- Fire Blanket
- Eye Wash/Shower
-Chemicals-
- Never taste chemicals
- Always waft liquid to detect the odor
- Never waft solids/powders
- Avoid touching chemicals
- Always wash hands with soap and water after lab
- If chemicals touch skin: flush skin with water for one minute and notify Mr. Leeds
-Glass-
- Hot/Cold glass look the same
- Never use chipped or broken glass
- Tell Mr. Leeds and dispose of the broken glass in the proper trash
- Never use force to insert or remove glass
-Alcohol Burners-
- Roll up sleeves, put up long hair, not just pull back
- Never walk away from a lit burner
- Never point the open end of a hot test tube at you or someone else
- Do not look down into a test tube/beaker while it is being heated
- Make sure burner is capped and flame is out when done
-End of Lab-
- Clean up area & materials completely
- Make certain that burner is out if one was used
- Keep goggles on until Mr. Leeds says to put them away
Reaction in a Bag
-Experimental Error-
- If there was a hole in the bag, we would not know that a gas has been produced.
-Red Liquid-
- Phenol Red
- Used as a PH indicator
- Below 7, color turns yellow
- Above 8, color turns pink
-PH Scale-
- measures acidity
- goes from 0-14, 7 being neutral
- 0-6: Acid
- 8-14: Alkaline/Base
- Lemon Juice PH: 1.5
- Tums PH: 10
-The 2 Solids-
- Calcium Chloride
- Acidic
- Hydro-tropic- attracted to water (absorbs water)
- Uses: canned vegetables (keeps them from getting mushy), electrolytes in sports drinks, flavors pickles (salty)
- Sodium Bicarbonate (Baking Soda)
- not acidic (PH=8.4)
- uses: baking, laundry detergent, toothpaste
Heating Baking Soda
Terms:
- Control Group- Unheated Test Tube
- Experimental Group- Heated Test Tube
- Indicator- Tea (indicates heated baking soda has changed)
- Variable- something you try to measure
- Independent/Dependent Variable
- Independent- something that affects the dependent variable
- Independent- temperature was affected
- Dependent- color of the tea
- Control Factors
- same type of tea
- same amount of baking soda
- same amount of tea
- same stirring time
- same size/shape test tube
Experimental Errors:
- Hole in tubing- we will not know if a gas has been produced
- If stopper is not snug, bottle will not fill with gas
- Stirring rod not cleaned before you begin
Box Question #1:
- Why do you think baking soda is used in baking? When heated, it releases a gas which helps dough/batter to rise.
Lab 1.1 Heating Baking Soda
1.2: Volume
- Unite of measurement: cm3
- Volume Formula: lwh
- Standard unit of length: meter
- 1 cm= 0.01 m
- 100 cm= 1 m
-Volume of Liquids-
- use a graduated cylinder to measure volume
- always check the interval or scale
- units= ml or cm3
- read from bottom of the meniscus
Box Questions 3-8 Answer Key (PG. 8)
- 50 cm3
- Box A has a larger space inside, and Box B is narrower.
- 7 cm3
- 8 cubes, 27 cubes, 8 cm3 and 27 cm3, a- 8 cm3 and b- 12 cm3
- The second box has the larger volume.
- As the surface increases, the depth decreases.
Box Questions 9-13 Answer Key (PG 11-12)
- 1.2 and 3.8 (cm3), 1.65 & 2.50 & 4.50 (cm3), The arrows are sometimes in between the tenths marks so that in turn is the easiest way to measure.
- A= 0.1 cm3, B= 0.2 cm3
- A= 4.0 cm3, B= 1.3 cm3
- 12: 11.5 & 12.4 (cm3), 12.0: 11.95 & 12.04 (cm3), 12.00: 11.995 & 12.004 (cm3)
- The lines are farther apart because less surface is equal to more depth and it is easier to read.