Intro to Physical Science Quiz 9/18
By: Ben Badnani
Whats on the Quiz?
Reaction in Bag Lab
Baking Soda Lab
Lab Safety Notes
Goggles on eyes all time (Until Mr. Leeds says its ok to take off)
Report all accidents or spills immediately
Nurse Extension: 2828
Safety Equipment Classroom
NEVER TASTE CHEMICALS
Waft Liquids to detect Odor
NEVER WAFT SOLIDS OR POWDERS!
Don’t physically touch Chemicals
Wash hands with soap after Lab always
Flush skin with water for 1 minute + Notify Mr Leeds if chemical touches skin
Hot and Cold Glass look the same
Never use chipped or broken glass (Tell Mr. Leeds and put in proper trash)
NEVER USE FORCE TO REMOVE OR INSERT GLASS
What to do?
- Roll up sleeves
- Put up long hair (Not just pull back)
- Never walk away from lit burner
- Never point the open end of a hot test tube at someone else or yourself
- Don’t look down into test tube/beaker while heated
- Burner is capped and flame is out when finished
End of Experiment
(Important Part of Lab or LOSE POINTS)
Clean up area & Materials!
Make sure burner is out!
Keep goggles on until instructed to take them off
Reaction in Bag
- Phenol Red, Acid
- Used as a PH Indicator ------> PH SCALE
- Measures acidity
- Goes from 0-14
- Lemon juice
- Calcium Chloride (Calcium + Chlorine)
- Opposite of Hydrofobic
- Attracted to water
- Absorbs Water
- Uses: Canned Veggies----> (Absorbs Water, Keeps fro setting mushy)
- Elelctrolyte in sports drinks (like gatorade)
- Used to flavor pickles (Salty)
Baking Soda: Sodium Bicarbonate
- Non Acidic
- Laundry Detergent
Heating Baking Soda
Experimental Group - Heated Baking Soda + Tea
Indicator: Tea (showed that the heated test tube is not Baking Soda)
Variables: A category you try to measure
Independent Variable: Causes a change in the dependent variable
- Temperature (Heat), flame
- Same type of Tea
- Same type of Baking Soda
- Same amount of Tea
- Same amount of Baking Soda
- Same size
- Same amount of stirring time
Stopper not snug
Not cleaning stirring rod ----> Contaminate
Extra Question for Lab
Is the amount of condensation more of less than the amount of Baking Soda that is being heated??
Answer: Something cannot produce more than itself. It is less since it is coming from the Baking Soda
Unit of Measurement
Cm3 = Cubic Centimeters
Volume = Length X Width X Height (a x b x c)
Standard Unit of Length = Meter (M)
1 Centimeter (1cm) = 0.1m
2. Always check that is says "ZERO" balance before Each Massing.
3. NEVER Switch Pans!
4. Pick up balance by red bar only.
5. Don't zero balance it when you are done.
Box Questions 1-13 (Except 2)
- Added to cakes, breads cookies, brownies etc. because when it is heated it releases gas allowing it to rise
3. How many cubic centimeters of water are required to fill a graduated cylinder to the 50.0-ml mark?
4. Rectangular box A has a greater volume than rectangular box B but the length of box A is less than the length of Box B. How is this possible?
- It could be the Height or the Width
5. Adding a stone to a graduated cylinder containing 25.0 cm3 of water raises the water level in the cylinder to the 32.0-cm3 mark. What is the volume of the stone?
- It is the Volume of the Stone
- 6. A student has a large number of cubes that measure 1 cm along each edge.
- How many cubes will be needed to build a cube that measures 2 cm along each edge.
- It is 8 cubes
- It is 27 cubes
- 8cm3, 27cm3
7. One rectangular box is 30 cm long, 15 cm wide, and 10 cm deep. A second rectangular box is 25 cm long, 16 cm wide and 15 cm deep. Which box has the larger volume?
- The second one has more volume
1. Estimate the positions of arrows / and II in Figure B(a) to the nearest 0.1 cm. Can you estimate their positions to 0.01. cm?
- 1.2, 3.8/ NO
- 1.65, 2.50, 4.50
- Will be more accurate
- 1 11.5-12.4
- 2 11.95-12.04
- 3 11.995-12.004
- Could round from any number after the decimal
13. What advantage is there to making graduated cylinders narrow and tall rather than short and wide?
- Easier to read because further apart because there is less surface and more depth