I.P.S. First Quiz

Safety, Reaction in a Bag, Heating Baking Soda, Volume Notes

Safety

  • goggles must be on until Leeds says to put them away
  • nurse: 2828
  • fire extinguisher, fire blanket, eye wash/shower
  • never taste chemicals
  • always waft liquids
  • never waft solids or powders
  • avoid touching chemicals
  • always wash hands
  • if chemicals touch skin: flush skin with water and notify Leeds
  • hot glass and cold glass look the same
  • roll up sleeves
  • put up long hair
  • 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
  • clean up area and materials completely

Reaction in a Bag Lab

1. Purpose:
  • to record the observations that occur when multiple chemical substances are combined and to use my observations to understand the reactions of the chemicals
2. Important Stuff:
  • we mixed substances A and B, red liquid, and water
  • A + any liquid = hot (exothermic reaction)
  • B + any liquid = cold (endothermic reaction)
  • A + B + any liquid = gas produced
  • the red liquid was phenol red
3. Phenol Red:
  • used as a pH indicator
  • below 7 turns yellow
  • above 8 turns pink
4. pH Scale:
  • measures acidity
  • goes from 0-14, 0-6 is acidic
  • 7 is neutral
  • 8-14 is alkaline
5. A:
  • calcium chloride
  • acidic
  • absorbs water
  • used in canned vegetables
  • electrolyte in Gatorade and sports drinks
  • flavors pickles (salty)
6. B:
  • sodium bicarbonate
  • alkaline, baking
  • laundry detergent
  • toothpaste
7. Experimental Errors:
  • Hole in bag


Heating Baking Soda Lab

1. Purpose:

  • to observe and record the reaction that occurs when baking soda is heated
2. Important Stuff:

  • we heated some baking soda in a test tube and noticed it created a gas and we mixed the heated baking soda with tea and some non-heated baking soda with tea and noticed they were different colors
  • control group: non-heated test tube
  • experimental group: heated test tube
  • indicator: tea (shows that the heated baking soda is not baking soda)
  • independent variable: temperature or heat
  • dependent variable: color of the tea
  • control factors: same type of tea, same amount of tea, same size test tube, same amount of baking soda, and same stirring time
3. Experimental Errors:

  • a hole in the rubber tubing
  • stopper is not snug
  • stirring rod not cleaned from class before


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Volume Notes

1. Important Stuff:

  • unit of measurement: c (cubic centimeter- c cubed)
  • volume: length x width x height
  • standard unit of length: meter (m)
  • one centimeter (1 cm) is .01 m
2. Volume of Liquids:

  • use graduated cylinder to measure
  • unit of measurement: mL or cm cubed
  • 1 mL is the same as 1 cm
  • read from the bottom of the meniscus