Chem 1313 Lab Prac cal (defini ons and some
examples)| Updated RATED A+ | NEW 2026
Mass
amount of the ma er present
Weight
force mass is a racted by mass of earth
Normalize
This is performed to make sure the Burne is not contaminated by previous residue.
Steps: close stopcock, add small amount (5- 10mL) of solu)on, wet all sides, drain
Aliquot
a por)on of a whole
Decan)ng
this is performed to separate a liquid and a solid (liquid is poured off of the solid
dependent
Variable that responds when a deliberate change is made in the other variable
X
What axis does the independent variable go?
range/# of squares
Formula for scaling an axes (include units when labeling axes)
"y vs x" + units
)tle of graph format
Meniscus
In a bure e or pipet, the liquid surface on the top will be convex, to read this you read the
bo om
wa9
, to odor test you do what?
Precipitate
A solid that has formed in a reac)on
Titra)on
Normalize a buret with the solu)on that will be delivered. Drain this solu)on into an Erlenmeyer
flask containing the solu)on to be )trated. Durning delievery, gently swirl the flask to mix the
two solu)ons, Is is o9en helpful to put a piece of white paper under the flask to clearly onserve
the color of the solu)on in the flask. Deliver the solu)on from the buret quickly at first, then
slowly near the end point, one or twp drops at a )me un)l a faint color persists for 15 or more
seconds. Touch the buret )p to the inside wall of the Erlenmeyer flask, rince the walls down
with a small amount of DI water, and then read the volume on the buret
smallest
To read laboratory equipment: first determine the magnitude of the smallest division, then
es)mate the reading in the next ______ order of magnitude.
10.00mL
Proper reading of 10mL pipet on read line: calibrated at 10.00mL
ALL
Proper reading of analy)cal balance read ______ digits of the balance
not significant
Sig Figs: When used solely to locate the decimal point (leading zeros) the zeros are
significant
Sig Figs: Zeros between nonzero digits in a number (cap)ve zeros) are
decimal
Sig Figs: Zeros occurring at the end of a number (trailing zeros) are significant only if a
_________ is present
fewest
Sig Figs: When adding or subtrac)ng numerical quan))es, the quan)ty with the __________
digits a9er the decimal point will limit the number which can be wri en for the answer
fewest
examples)| Updated RATED A+ | NEW 2026
Mass
amount of the ma er present
Weight
force mass is a racted by mass of earth
Normalize
This is performed to make sure the Burne is not contaminated by previous residue.
Steps: close stopcock, add small amount (5- 10mL) of solu)on, wet all sides, drain
Aliquot
a por)on of a whole
Decan)ng
this is performed to separate a liquid and a solid (liquid is poured off of the solid
dependent
Variable that responds when a deliberate change is made in the other variable
X
What axis does the independent variable go?
range/# of squares
Formula for scaling an axes (include units when labeling axes)
"y vs x" + units
)tle of graph format
Meniscus
In a bure e or pipet, the liquid surface on the top will be convex, to read this you read the
bo om
wa9
, to odor test you do what?
Precipitate
A solid that has formed in a reac)on
Titra)on
Normalize a buret with the solu)on that will be delivered. Drain this solu)on into an Erlenmeyer
flask containing the solu)on to be )trated. Durning delievery, gently swirl the flask to mix the
two solu)ons, Is is o9en helpful to put a piece of white paper under the flask to clearly onserve
the color of the solu)on in the flask. Deliver the solu)on from the buret quickly at first, then
slowly near the end point, one or twp drops at a )me un)l a faint color persists for 15 or more
seconds. Touch the buret )p to the inside wall of the Erlenmeyer flask, rince the walls down
with a small amount of DI water, and then read the volume on the buret
smallest
To read laboratory equipment: first determine the magnitude of the smallest division, then
es)mate the reading in the next ______ order of magnitude.
10.00mL
Proper reading of 10mL pipet on read line: calibrated at 10.00mL
ALL
Proper reading of analy)cal balance read ______ digits of the balance
not significant
Sig Figs: When used solely to locate the decimal point (leading zeros) the zeros are
significant
Sig Figs: Zeros between nonzero digits in a number (cap)ve zeros) are
decimal
Sig Figs: Zeros occurring at the end of a number (trailing zeros) are significant only if a
_________ is present
fewest
Sig Figs: When adding or subtrac)ng numerical quan))es, the quan)ty with the __________
digits a9er the decimal point will limit the number which can be wri en for the answer
fewest
