Exam (elaborations)
CHEM 212 LAB REPORT 3 2023
- Course
- Institution
CHEM 212 LAB REPORT 3 2023
[Show more]
Seller
Follow
tutorsection1
Reviews received
Content preview
CHEM 212 LAB REPORT 3 2023/2024| PORTAGELEARNING|WITH PROCEDURES, EXPLANATION
AND FINAL RESULTS.HIGHLY VERIFIED
Experiment #: Lab 3 Title: Enzymatic Activity of
Lactase
homogeneous sample - ANSWER A sample with a consistent composition
throughout.
(ex. Solid chocolate bar)
Heterogeneous sample - ANSWER A sample with differing compositions throughout.
(ex. peanut and caramel chocolate bar)
sample preparation - ANSWER transforming a sample into a state that is suitable for
analysis
Analyte - ANSWER A substance that is being identified or measured in a laboratory
test.
Quantitative transfer - ANSWER Moving a solution from one vessel to another
without losing any analyte in the process.
composite sample - ANSWER A representative sample prepared from a
heterogeneous material. If the material consists of distinct regions, the composite is
made of portions of each region, with relative amounts proportional to the size of
each region.
calibration curve - ANSWER a graph of detector response as a function of analyte
concentration
standard solution - ANSWER a solution of known concentration
General steps in a chemical analysis - ANSWER 1. Formulating the question
2. Selecting analytical procedures
3. Sampling
4. Sample preparation
5. Analysis
6. Reporting and interpretation
7. Drawing conclusions
aliquot - ANSWER A portion of a well-mixed sample removed for testing
random heterogeneous material - ANSWER A material in which there are fine-scale
differences in composition with no pattern or predictability. When you collect a
, portion of the material for analysis, you obtain some of each of the different
compositions.
random sample - ANSWER a sample in which every element in the population has
an equal chance of being selected
segregated heterogeneous material - ANSWER A material in which differences in
composition are on a large scale. Different regions have obviously different
composition. (ie a section of forest or a lake)
Acuracy - ANSWER how close a measured value is to an accepted value
Precision - ANSWER a measure of how close a series of measurements are to one
another
Sensitivity - ANSWER the capability of responding reliably and measurably to
changes in analyte concentration.
Interference - ANSWER occurs when a species other than analyte increases or
decreases the response of the analytical method and makes it appear that there is
more or less analyte than is actually present.
Masking - ANSWER When the presence of an interfering species prevents the
detection of the analyte.
representative sample - ANSWER a sample that accurately reflects the
characteristics of the population as a whole
Concentration - ANSWER A measurement of how much solute exists within a certain
volume of solvent
Molarity - ANSWER the number of moles of solute per liter of solution
Density - ANSWER Mass per unit volume
(g/L)
weight percent (wt%) - ANSWER mass of solute/mass of solution x 100
ppm (parts per million) - ANSWER 1 gram of solute per 1 million grams of total
solution
ppb (parts per billion) - ANSWER 1 gram of solute per 1 billion grams of total solution
weight percent - ANSWER mass of one component divided by the total mass of the
mixture, multiplied by 100%
volume percent - ANSWER volume of solute/volume of solution x 100
Solute - ANSWER A substance that is dissolved in a solution.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller tutorsection1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81989 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now