My Test 1 Study Guide
by jon shashoua
Post lab 1
- Red liquid is called phenol red
- It is used as a PH indicator
- the PH scale ranges from 0-14
- 0-6 is acidic, 7 is neutral, and 8-14 is alkaline
- substance A was calcium chloride
- it is mildly acidic
- it is hydro tropic (attracted to water)
- its compound is calcium plus chlorine
- uses are canned veggies (preservative), electrolytes in sport drinks, flavors pickles
- Substance B is sodium bicarbonate(baking soda)
- It is basic
- Uses are cat litter, tooth paste, and laundry detergent
Lab 2 blue dots and box questions
- when heated baking soda shows no difference in appearance
- the top of the test tube is cloudy and condensation is occurring
- what is being viewed in the inverted bottle is water being expelled
- the gas is coming from the baking soda
- the droplets are coming from gas cooling and reverting into a liquid at the top of the hose
- The color of the heated baking soda with tea is dark orange
- The color of the non heated baking soda with tea is honey orange
- some experimental errors could be the stopper not all the way in or the tubing could have a hole in it
- When baking soda is heated produces past that helps bread rise
Metrics
- cm cubed (cubic centimeters)
- Volume L * W * H
- Standard unit of length is the meter
- 1cm = 0.01m
- 100cm = 1m
- single pan balance steps
- check pan is clean and dry
- always zero balance before each measurement (use adj knob if needed)
- never switch pans (serial number matches scales)
- pick up balances by red only
- don't zero balance when done