Chem 121 Lab Report Final
Updated 2026/2027 Questions With Answers
( Answers with corresponding Question)
Basic laboratory techniques - answer-which lab had this objective: to learn the use
of common laboratory equipment to measure mass and volume, to use metric units
and significant figures in measurements and calculations, and to become familiar
with the concept of density
Analytical balance, thermometer, and pipet - answer-what 3 instruments were used
in experiment 1?
1). Calibrated a pipet
2). Measured the density of water
3). Measured the density of antifreeze - answer-what did you accomplish in
experiment 1?
Insert the tip of the pipet into a liquid and squeeze the rubber bulb to get the correct
amount of liquid you want to measure, or you can use your finger to get the liquid
up - answer-how do you use a pipet?
Density= mass/volume - answer-what is the formula for density?
1).silicon dioxide
2).sodium chloride
3).calcium carbonate - answer-what are 3 of the main components of beach sand?
Having the same composition throughout the mixture, often called a solution
- ex. Vinegar and household ammonia - answer-what is a homogeneous mixture?
Having varying composition throughout the mixture
- ex. Dirt with pebbles - answer-what is a heterogeneous mixture?
A physical property used to separate mixtures - answer-what is solubility?
1). Filtering
2). Solubility
3). Decantation
, 4). Sedimentation
5). Extraction
6). Sublimation - answer-what are 6 methods of separating mixtures?
Recording mass of evaporating dish with and without beach sand, add water,
decant the solution to separate the components, repeat with a new liquid, filter out
the liquid using a filter paper - answer-what was the procedure and result of
experiment 2?
Recovered mass/initial mass * 100 - answer-what is the formula for percent yield?
No - answer-is sio2 soluble in water?
No - answer-is caco3 soluble in water?
Yes - answer-is cacl2 soluble in water?
Determining how much of one or more constituents is present in a particular
sample of material - answer-what is analytical chemistry concerned with?
The constituent being determined is isolated in some weighable form - answer-
what does gravimetric analysis derive its name from?
The amount of constituent being determined involves measuring the volume of
reagent - answer-what does volumetric analysis derive its name from?
Experiment 3: gravimetric determination of phosphorus in plant food - answer-
what experiment had this objective: to illustrate an application of gravimetric
analysis to a consumer product?
Qualitatively: to determine what substances they contain
Quantitatively: to determine how much of these substances are present - answer-
what does it mean that consumer chemicals are analyzed both qualitatively and
quantitatively?
1). Nitrogen
2). Phosphorus
3). Potassium - answer-what are the 3 essential nutrients in plant food?
Updated 2026/2027 Questions With Answers
( Answers with corresponding Question)
Basic laboratory techniques - answer-which lab had this objective: to learn the use
of common laboratory equipment to measure mass and volume, to use metric units
and significant figures in measurements and calculations, and to become familiar
with the concept of density
Analytical balance, thermometer, and pipet - answer-what 3 instruments were used
in experiment 1?
1). Calibrated a pipet
2). Measured the density of water
3). Measured the density of antifreeze - answer-what did you accomplish in
experiment 1?
Insert the tip of the pipet into a liquid and squeeze the rubber bulb to get the correct
amount of liquid you want to measure, or you can use your finger to get the liquid
up - answer-how do you use a pipet?
Density= mass/volume - answer-what is the formula for density?
1).silicon dioxide
2).sodium chloride
3).calcium carbonate - answer-what are 3 of the main components of beach sand?
Having the same composition throughout the mixture, often called a solution
- ex. Vinegar and household ammonia - answer-what is a homogeneous mixture?
Having varying composition throughout the mixture
- ex. Dirt with pebbles - answer-what is a heterogeneous mixture?
A physical property used to separate mixtures - answer-what is solubility?
1). Filtering
2). Solubility
3). Decantation
, 4). Sedimentation
5). Extraction
6). Sublimation - answer-what are 6 methods of separating mixtures?
Recording mass of evaporating dish with and without beach sand, add water,
decant the solution to separate the components, repeat with a new liquid, filter out
the liquid using a filter paper - answer-what was the procedure and result of
experiment 2?
Recovered mass/initial mass * 100 - answer-what is the formula for percent yield?
No - answer-is sio2 soluble in water?
No - answer-is caco3 soluble in water?
Yes - answer-is cacl2 soluble in water?
Determining how much of one or more constituents is present in a particular
sample of material - answer-what is analytical chemistry concerned with?
The constituent being determined is isolated in some weighable form - answer-
what does gravimetric analysis derive its name from?
The amount of constituent being determined involves measuring the volume of
reagent - answer-what does volumetric analysis derive its name from?
Experiment 3: gravimetric determination of phosphorus in plant food - answer-
what experiment had this objective: to illustrate an application of gravimetric
analysis to a consumer product?
Qualitatively: to determine what substances they contain
Quantitatively: to determine how much of these substances are present - answer-
what does it mean that consumer chemicals are analyzed both qualitatively and
quantitatively?
1). Nitrogen
2). Phosphorus
3). Potassium - answer-what are the 3 essential nutrients in plant food?
