CHEM 101L QUESTIONS AND ANSWERS
Apparel
Attire: long well fitting cotton or wool clothing; closed leather shoes, no jewelry, no make up application, no contacts
PPE
Always wear googles, wear gloves except when leaving the lab and working with electronics/labtop
Chemical Safety-
-1-label
...
Apparel
Attire: long well fitting cotton or wool clothing; closed leather shoes, no jewelry, no make
up application, no contacts
PPE
Always wear googles, wear gloves except when leaving the lab and working with
electronics/labtop
Chemical Safety-
-1-label
-2-spill
-3-acid or water
Bunsen Burner Safety-
-1-step one?
-2-flame goes out? smell gass?
-3-chipped glass?
-4-how to heat flammable chemicals?
Thermometer safety
-1-shake it?
-2-temp range
-3-choosing a thermo?
Behavior
-1-eating, drinking, makeup?
-2-how to read a burette higher than you
-3-belongings
-4-small fire-->big fire-->dropped the ball size fire
1- Read the three most important things twice: conc., hazard warning, full name
2-report spill, allow teacher to clean it
3-acid to water always
----
1-check line for cracks
2-turn off gas
3-no it could break under heat
4-NOT A BUNSEN BURNER use a steam bath under the hood
----
1-no...
2-(-20-100˚C)
3-know range of experiment and thermo
4-
1-no
2-lower it /use a step stool
3-away away away
4-cover with lid-->teacher-->fire dept and notify what chemicals
Honor Code
, violations:
-concepts may be discussed with partner or ta, but you must have work that reflects
your understanding
-ideas in report must be your own
-allowing students to use your work
-using old lab reports
-old lab manual
Equipment
-volumetric vs graduated
-erlenmyer flask?
-burette vs pippete
-volumentric-one volume
-graduate-measurable volume
-ehrlenmyer=pyramid
-burette-workes with gravity while pipette-sucks up and pushes out
-
sig figs-
2.633 is measured to the?
-nearest thousandth
Calculating Precision vs Accuracy
Precision: (a measure of reproducibility
compare mean and sd
standard deviation
square root(sum of each(measured-average)^2/df)
df=n of values -1
Accuracy:
percent error
abs value of obs-expected/expected*100
how to calculate volume from Buret segment
Vburet-Vwater-Vdisp
40L Buret-20Lwater-22Lwater after adding a marble
20L water...2L marble (bowling ball...)
Density, vol, temp relationship
D=m/v
PV=nRt
therefore D=m/(kT)
Inversely proportional at constant pressure
Experiment 2 vocab
1-solution
2-bond formation
3-dissolution
1homogenous, can be solid, liquid, or gas
2-bonds-solution is the medium that brings reactants close enough together to allow
bonds to form; bonds breaking takes energy and bond forming releases energy
3-making the solute dissolve
chem reaction types for_____
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