Study Guide By: Emily Smith

Quiz #1

Reaction in a Bag

  • A/Liquid- Heat (exothermic)
  • B/Liquid- Cold (endothermic)
  • A/B/Liquid- Gas
  1. Red Liquid:
  • used as PH indicator
  • below 7 turns yellow
  • above 8 turns pink
2. PH Scale


  • measures acidity
  • goes from 0-14
  • 0-6- aci; 7- neutral; 8-14- alkaline
2 Solids:

  • Calcium Chloride:
  • acidic
  • hydrotropic
  • uses: canned veggies (keeps them from getting mushy); electrolyte (in a sports drink); flavors pickles (salty flavor)
  • Sodium Bicarbonate:
  • not acidic
  • uses: baking, cat litters, toothpaste, laundry detergent

Volume Notes

  • Unit of measurement- cubic centimeters (cm^3)
  • Volume- lwh
  • Standard unit of length- meter (M)
  • 1cm= 0.1m_________100cm=1m
  • Unit- small cube 1cm on each edge
Volume of Liquids:
  • use a graduated cylinder to measure volume (always check intervals or scale)
  • Units- milliters (mL) or cm^3 (1mL=1cm^3)
  • read from bottom of meniscus

Single Pan Balance Notes

1. check that pan is clean and dry


2. always zero balance before each massing

  • push all riders to zero (left)
  • use adjustment knob if needed
3. never switch pans

4. pick up balance by red bar only

5. don't zero balance when done

Safety

For Every Lab:


  • goggles over eyes until directed to take them off (even if finished)
  • report all accidents/ spills to Mr. Leeds immediately
  • try to use common sense
In case of emergency:

  • 2828

Safety equipment in classroom:

  • fire extinguisher
  • fire blanket
  • eye wash/ shower

Chemicals:

  • never taste
  • never touch
  • always waft liquids
  • never waft solids/ powders
  • wash hands with soap and water after lab
  • if chemicals on skin: flush skin with water for a minute and tell Mr. Leeds

Glass:

  • hot and cold glass look the same
  • never use chipped/ broken glass (tell mr. leeds and dispose correctly)
  • never use force to insert or remove glass

Alcohol Burners:

  • roll up sleeves; tie up hair
  • never walk away from lit burner
  • never point open end of test tube at yourself or someone else
  • don't look down into heated beaker/ test tube
  • make sure burner is capped and flame is out when done

End of Experiment:

  • clean up area and materials (or points lost)
  • make sure burner is out
  • keep goggles on eyes until otherwise directed

Box Questions

  • Baking soda used in baking because it releases gas when heated which helps dough to rise.
  • 50cm^3 needs to fill a graduated cylinder to the 50m: mark
  • Advantage of narrow/ tall cylinder: line are further apart b/c theres less surface= more depth makes it easier to read



Heating Baking Soda

  • Gas- from the heated baking soda
  • Condensation- from hot gas touching cooler surface at top, test tube cools back to a liquid
  • Control Group: unheated test tube
  • Experimental Group: heated test tube
  • Indicador- Tea (shows you that heated test tube wasn't baking soda)
  • Variable- something you want to measure
  • Independent Variable- causes a change in dependent variable (temperature; heat)
  • Dependent Variable- Color of the tea
  • Control Factors- same type of tea, same amount of baking soda, same amount of tea, same stirring time, same size test tube