Quiz #1 Study Guide
Sydney Lubetkin
Safety Quiz Notes
Nurse's extension number:
- 2828
Safety equipment in the classroom:
- Fire Extinguisher
- Fire blanket
- Eye wash/station
Chemicals:
- Never taste chemicals even if they look yummy
- Always waft liquids to detect 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 1 minute and notify Mr. Leeds
Glass:
- Hot glass and cold glass look the same
- Never use chipped or broken glass
- Never use force to insert or remove glass
Alcohol Burners:
- Roll up sleeves, put up long hair
- Never walk away from a lit burner
- Never point the open end of a hot test tube at yourself 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 Experiment:
- Clean up area and materials completely (or you lose points)
- Make certain that burner is out if one was used
- Keep goggles on (over eyes) until Mr. Leeds says to put them away
Reaction in a Bag Lab
- phenol red
- used as a pH indicator
- below 7 turns yellow
- above 8 turns pink
Two Solids:
A:
- Calcium Chloride (calcium + chloride)
- acidic
- hydrotropic: absorbs water (attracted to water)
- Uses: canned veggies(keeps from getting mushy). electrolytes in sports drinks, and flavors pickles (salty flavor)
B:
- sodium bicarbonate (baking soda)
- not acidic
- uses: baking, toothpaste, laundry detergent
pH scale:
- measures acidity
- goes from 0-14
- 0-acid
- 7-neutral
- 14- alkaline
- lemon juice- 1.5
- tums- 10
Heating Baking Soda Lab
- moisture condensation comes from hot gas touching cooler top of the test tube turning back to a liquid
Control Group:
- unheated test tube
Experimental Group:
- heated test tube
Indicator:
- the tea (showed that heated is no longer b. soda)
Volume Notes
Volume: lxwxh
Volume of Liquids:
- use a graduated cylinder to measure volume
- *always check the intervals or scale*
- units= millileters (mL) or cm3
- 1mL= 1cm3
- read from BOTTOM of meniscus
Single Pan Balance Notes
- check pan is clean and dry
- always zero balance before massing (push all riders to 0 and use adjustment knob if needed)
- Never switch pans
- Pick up balance by red bar only
Box Questions #1-13 skip #2
- When heated it releases a gas which allows dough/batter to rise
3. How many cubic centimeters of water are required to fill a graduated cylinder to the 50.0mL mark?
- 50 cm3
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?
- Rectangle A must have a bigger width and height.
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?
- 7cm3
6a. How many cubes will be needed to build a cube that measures 2cm along each edge?
- 24 cubes
6b. How many cubes will be needed to build a cube that measures 3cm along each edge?
- 36 cubes
6c. What is the volume, in cubic centimeters, of each of the cubes in (a) and (b)?
- a= 24 mL
- b= 36 mL
7. One rectangular box is 30cm long, 15cm wide, and 10cm deep. A second rectangular box is 25cm long, 16cm wide and 15cm deep. Which box has the larger volume?
- The second box
8. Figure A shows a cone-shaped graduate used for measuring the volume of liquids. Why are the divisions not equally spaced?
- Because the cup gradually gets wider. As the height increases, the surface decreases.
9a. Estimate the position of arrows I and II in figure B(a) to the nearest 0.01cm. Can you estimate their positions to the 0.001 cm?
- I- 1.2
- II- 3.7
- I- 1.19
- II- 3.78
9b. Estimate the positions of arrows III, IV, and V in Figure B(b) to the nearest 0.01 cm. Can you estimate their positions to 0.001 cm?
- III- 1.65
- IV- 2.51
- V- 4.50
- III- 1.651
- IV- 2.510
- V- 4.501
9c. Why should you report the positions of the arrows in part (b) to the nearest 0.01 cm and not to the nearest 0.1 cm?
- Because Figure B(b) shows the millimeter marks
10. What part of a cubic centimeter do the smallest divisions on each of the graduated cylinders in Figure C represent? Express your answer as a decimal.
- a. 0.1
- b. 0.2
11. What is the level of the liquid in Figure D(a) to the nearest half division? WHat is the level in figure D(b) to the nearest half division?
- a- 4.0
- b- 1.3
12. Three students reported the length of a pencil to be 12 cm, 12.0 cm, and 12.00 cm. Do all three readings contain the same information?
- 12: 11.5-12.4
- 12.0: 11.95- 12.04
- 12.00: 11.995-12.004
13. What advantage is there to making graduated cylinders narrow and tall rather than short and wide?
- Lines farther apart because less surface so need more depth