Deja Vasquez
October 30, 2013
H-23
Flame Test Experiment
Purpose: to demonstrate and classify the characteristics of a chemical reaction.
Objective: describe the difference between a physical and chemical change.
Objective: describe the difference between a physical and chemical change.
Data Table:
Chemical Compounds:
|
Elements:
|
Characteristics:
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Barium C
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Barium
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Light Green
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Calcium C
|
Calcium
|
Orange
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Lithium C
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Lithium
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Usher Red
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Potassium C
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Potassium
|
Lavender
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Sodium C
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Sodium
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Orangish Yellow
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Strontium C
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Strontium
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Red
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Aluminum Foil
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Aluminum
|
Sparkle
|
Unknown???
|
Barium & Lithium
|
Light Green/Usher Red
|
In the image below you'll see some of the following examples from the graph with the exception of copper and selenium.
In the Link below is a video from youtube that displays how to Flame Experiment works. It contributes to the graph with the excepting of copper.
Post Lab Questions:
1.) What indicators (at least 3) determine that a chemical change (or reaction) has occurred?
2.) What is emitted when a chemical change takes place in the flame test?- Color, the flame tests, solid to carbon dioxide in a gaseous state.
- Different colors are shown from the different chemicals that are combine like barium c liquid alone is clear but poured into the flame made a light green color.
3.) What group, from the periodic table, do these elements exist?
- Alkaline Earth Metals, Post Transition Metals, Alkaline Metals.
4.) Do any two elements give the same spectrum of color? Explain why?
- Yes calcium c and sodium c both give the same spectrum of orange. I believe it's because at its original calcium and sodium they are like this silver and grey color so in the flame test they come off as the same color.
5.) Recall what a catalyst is in a chemical reaction. What was the catalyst in these reactions?
- A catalyst heat up a reactant, but in these reactant it is used as electricity (electrolysis) to separate water into elements.
Critical Thinking: Explain how the data gathered in this lab can be used to solve crimes or convict criminals. Research the topic and use what you discovered in class to write 1-2 paragraphs on answering the question.
*Be sure to cite your source.
- www.daviddarling.info
Critical Thinking:
- http://www.hometrainingtools.com/forensics-science-newsletter/a/1729/
- http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/patterns/forensicsciencerev2.shtml
- http://courseapproval.asu.edu/node/248
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