Quiz #1 Study Guide
Safety Quiz Notes
Nurse's extension number:
Safety equipment in the classroom:
- Fire Extinguisher
- Fire blanket
- Eye wash/station
- 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
- Hot glass and cold glass look the same
- Never use chipped or broken glass
- Never use force to insert or remove glass
- 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
- Calcium Chloride (calcium + chloride)
- hydrotropic: absorbs water (attracted to water)
- Uses: canned veggies(keeps from getting mushy). electrolytes in sports drinks, and flavors pickles (salty flavor)
- sodium bicarbonate (baking soda)
- not acidic
- uses: baking, toothpaste, laundry detergent
- measures acidity
- goes from 0-14
- 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
- unheated test tube
- heated test tube
- the tea (showed that heated is no longer b. soda)
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?
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