friday, 11/19/2010
DESCRIPTION
Friday, 11/19/2010. Objective: Chromatography Lab! Get your folder and get ready to start the TIMED BELLRINGER QUESTION. BELL RINGER. 5 MINUTES. 1. How do plants get energy?. 2 . Why do leaves change colors in the fall?. BELL RINGER. 4 MINUTES. 1. How do plants get energy?. - PowerPoint PPT PresentationTRANSCRIPT
Friday, 11/19/2010
• Objective: Chromatography Lab!
Get your folder and get readyto start the
TIMED BELLRINGER QUESTION.
BELL RINGER
1. How do plants get energy?
2. Why do leaves change colors in the fall?
5 MINUTES
BELL RINGER
1. How do plants get energy?
2. Why do leaves change colors in the fall?
4 MINUTES
BELL RINGER
1. How do plants get energy?
2. Why do leaves change colors in the fall?
3 MINUTES
BELL RINGER
1. How do plants get energy?
2. Why do leaves change colors in the fall?
2 MINUTES
BELL RINGER
1. How do plants get energy?
2. Why do leaves change colors in the fall?
1 MINUTE
TIME’S UP!!!!!
Paper Chromatography
Lab
What is Chromatography?Chromatography is a technique for separating mixtures into their components in order to analyze, identify, purify, and/or quantify the mixture or components.
Separate
• Analyze• Identify• Purify• Quantify
ComponentsMixture
Uses for Chromatography
Chromatography is used by scientists to:
• Analyze – examine a mixture, its components, and their relations to one another• Identify – determine the identity of a mixture or components based on known components• Purify – separate components in order to isolate one of interest for further study• Quantify – determine the amount of the a mixture and/or the components present in the sample
Illustration of Chromatography
Mixture Components
Separation
Uses for ChromatographyReal-life examples of uses for chromatography:
• Pharmaceutical Company – determine amount of each chemical found in new product• Hospital – detect blood or alcohol levels in a patient’s blood stream• Law Enforcement – to compare a sample found at a crime scene to samples from suspects• Environmental Agency – determine the level of pollutants in the water supply• Manufacturing Plant – to purify a chemical needed to make a product
Overview of the Experiment
Purpose: • To explain the relationship between pigments
and photosynthesis.• To predict which pigment colors would be best
for photosynthesis.
• 100 mL beaker• Isopropyl Alcohol (10 mL)• Chromatography paper
strip • Spinach leaf solution
– Red leaf lettuce solution• Disposable Pipette• Pencil• Ruler• Scissors• Tape
Materials List
Preparing the Chromatography Strips
2. Starting at the line, taper the bottom of the paper with scissors.
3. Place 1-2 drops of the spinach leaf solution on the starting line and allow to dry
1. Draw a line 1.5 cm above the bottom edge of the strip with the pencil
Developing the Chromatograms
• Place the strip in the beaker• Make sure the solution does
not come above the drop on your start line
• Fold the top of the strip over your beaker and tape to keep in place
• Let strips develop for approximately 15 minutes
• Remove the strips and let them dry
• Use the table on your lab handout to analyze your chromatography strip
• Answer the analysis questions in your lab notebook
RESULTS
Debrief/Wrap UpKnowledge of Inquiry
*Scientific investigation begin with a problem but don’t necessarily test a hypothesis
*There is no single scientific method*Inquiry procedures are guided by a
question*All scientists performing the same
procedures may not get the same results*Inquiry procedures can influence results*Conclusions must be consistent with the
data*Scientific data is not the same as scientific
evidence*Explanations are developed from the data
and what is known
NOS*Tentativeness*Creativity*Observation vs. Inference*Subjectivity*Theory and law*Socially/culturally
embedded*Empircally based
Suggestions/Comments: