BISC 131 Lab Final Study Guide
common unit for measuring length - Answer -meters
How many millimeters are in a meter? or how many meters in a millimeter? How many
meters in a micrometer? - Answer -1000mm
0.001m
0.000001m
what is common unit for measuring mass - Answer -grams
common unit for measuring volume - Answer -liters
what does a spectrophotometer do - Answer -measures how much light is absorbed by
a sample
what do you need before you can use the spectrophotometer - Answer -a blank for it
what is the absorbance value - Answer -proportion of light absorbed by the sample
(AKA optical density)
what is the pH of something and how is it measured - Answer -the measurement of how
acidic or basic a solution is; electronic pH scales
describe pH scale - Answer -acids have lower pH values which means more hydrogen
ions; bases have higher pH which means they have less hydrogen ions
when do you use a beaker - Answer -used to stir, mix or heat liquids
when to use a flask - Answer -measuring or holding liquids
When to use a graduated cylinder? - Answer -to measure volumes of liquids
how to find molarity - Answer -moles divided by volume in liters
how to find number of moles - Answer -mass in grams divided by molar mass (g/mol)
what is the unit for percentages in concentration - Answer -g/mL
, be able to do dilutions and serial dilutions - Answer -look on paper
a procedure or set of steps that is used to acquire knowledge that can then be used to
support or challenge a prediction about how the natural world works - Answer -scientific
method
What are the steps of the scientific method? - Answer -1. observation
2. question
3. hypothesis
4. prediction
5. experiment
what is a sample size - Answer -number of events or individuals observed in a subset
what is sampling error - Answer -difference between the results from sampling all
events/individuals and results from sampling a subset of that group
what is the relationship between sample size and sampling error - Answer -they are
inversely related; when sample size is small then the sampling error is high and vice
versa
What are controlled variables? - Answer -variables that are controlled by the
experimenter
what are experimental variables - Answer -the single variable that is NOT controlled;
factor you are purposefully changing
what are three type of groups/controls in experiments - Answer -positive control group,
negative control group, experimental group
what is the experimental group - Answer -the group of samples in which the effect is not
known
what is the negative control group - Answer -the group in the experiment that is
designed in such a way to remove the variable that is expected to cause the effect
what is the positive control groups - Answer -group designed so that an effect is
expected
the introduction of any contaminate to a natural environment, which has a negative
effect on the organisms living there - Answer -pollution
what was the hypothesis of the environmental pollution lab - Answer -sodium chloride
(salt) will inhibit the growth of ankistrodesmus algae
common unit for measuring length - Answer -meters
How many millimeters are in a meter? or how many meters in a millimeter? How many
meters in a micrometer? - Answer -1000mm
0.001m
0.000001m
what is common unit for measuring mass - Answer -grams
common unit for measuring volume - Answer -liters
what does a spectrophotometer do - Answer -measures how much light is absorbed by
a sample
what do you need before you can use the spectrophotometer - Answer -a blank for it
what is the absorbance value - Answer -proportion of light absorbed by the sample
(AKA optical density)
what is the pH of something and how is it measured - Answer -the measurement of how
acidic or basic a solution is; electronic pH scales
describe pH scale - Answer -acids have lower pH values which means more hydrogen
ions; bases have higher pH which means they have less hydrogen ions
when do you use a beaker - Answer -used to stir, mix or heat liquids
when to use a flask - Answer -measuring or holding liquids
When to use a graduated cylinder? - Answer -to measure volumes of liquids
how to find molarity - Answer -moles divided by volume in liters
how to find number of moles - Answer -mass in grams divided by molar mass (g/mol)
what is the unit for percentages in concentration - Answer -g/mL
, be able to do dilutions and serial dilutions - Answer -look on paper
a procedure or set of steps that is used to acquire knowledge that can then be used to
support or challenge a prediction about how the natural world works - Answer -scientific
method
What are the steps of the scientific method? - Answer -1. observation
2. question
3. hypothesis
4. prediction
5. experiment
what is a sample size - Answer -number of events or individuals observed in a subset
what is sampling error - Answer -difference between the results from sampling all
events/individuals and results from sampling a subset of that group
what is the relationship between sample size and sampling error - Answer -they are
inversely related; when sample size is small then the sampling error is high and vice
versa
What are controlled variables? - Answer -variables that are controlled by the
experimenter
what are experimental variables - Answer -the single variable that is NOT controlled;
factor you are purposefully changing
what are three type of groups/controls in experiments - Answer -positive control group,
negative control group, experimental group
what is the experimental group - Answer -the group of samples in which the effect is not
known
what is the negative control group - Answer -the group in the experiment that is
designed in such a way to remove the variable that is expected to cause the effect
what is the positive control groups - Answer -group designed so that an effect is
expected
the introduction of any contaminate to a natural environment, which has a negative
effect on the organisms living there - Answer -pollution
what was the hypothesis of the environmental pollution lab - Answer -sodium chloride
(salt) will inhibit the growth of ankistrodesmus algae
