lab exam review - mssulik.weebly.com
TRANSCRIPT
![Page 1: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/1.jpg)
Lab Exam Review
![Page 2: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/2.jpg)
General Reminders
•NO PERSONAL PRONOUNS
•Materials should be organized (list or columns)
•Number the steps of the procedure
•Be specific in the procedure
![Page 3: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/3.jpg)
General Reminders
• Procedure is written in present tense and starts
with a verb
• Record results and repeat steps (where needed)
• Data needs to be presented in an organized, neat
manner (use a table with a title)
![Page 4: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/4.jpg)
General Reminders
In the conclusion:
• Restate the aim
• Restate the hypothesis
• Summarize test results and analysis
• 2 Sources of error and/or improvements (that are not
silly mistakes: mislabelling or miscalculating)
![Page 5: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/5.jpg)
Testing for Identification
• Although non-characteristic properties can be shared by many
different substances, they can still be useful in helping to identify
an unknown
• Substances will have different combinations of non-
characteristic properties
• Some non-characteristic properties can be used to determine a
characteristic one (volume & mass are used to calculate density)
![Page 6: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/6.jpg)
Testing for Identification
• You need to know how to conduct and analyze the results of the
following tests:
Electrical conductivity
Presence of water
Litmus paper
Presence of glucose
Presence of protein
Presence of fat
Colour
![Page 7: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/7.jpg)
Electrical Conductivity
• How: Conductivity meter
• Possible outcomes:
• Light turns on = Substance conducts! Indicates
the presence of minerals/salts
• Light stays off – does not conduct
![Page 8: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/8.jpg)
Presence of Water (H2O)
• How: Cobalt chloride paper
• Possible outcomes:
• Stays blue = No water present
• Turns light pink = There’s water present in the
solution!
![Page 9: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/9.jpg)
Presence of Water (H2O)
![Page 10: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/10.jpg)
Acid, Base or Neutral
• How: Red and blue litmus paper
• Possible outcomes:
• Red → Red, Blue → Blue = neutral
• Red → Blue, Blue → Blue = base
• Red → Red, Blue → Red = acid
![Page 11: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/11.jpg)
Presence of Protein
• How: Biuret solution (protein test solution)
• Possible outcomes:
• Stays blue = No protein
• Turns purple = Protein is present in the solution
![Page 12: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/12.jpg)
Protein or no protein?
Protein ProteinNo protein
![Page 13: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/13.jpg)
Presence of Glucose
•How: Glucose test paper
•Possible outcomes:
• Stays yellow = No glucose
•Turns green = Glucose is present in the solution
![Page 14: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/14.jpg)
Presence of Starch
•How: Lugol’s solution
•Possible outcomes:
• Stays yellow/orange= No starch
• Turns dark blue/black= Starch is present in the
solution
![Page 15: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/15.jpg)
Presence of Fat
•How: Alcohol test
•Possible outcomes:
• Stays transparent = No fat
• Turns white and cloudy = Fat is present in the
solution
![Page 16: Lab Exam Review - mssulik.weebly.com](https://reader030.vdocuments.us/reader030/viewer/2022012410/616a63e911a7b741a351f87b/html5/thumbnails/16.jpg)
Review Question
Test/
Liquids
Acid Base Salt water Distilled
water
Alcohol
CCP √ √ √ √x
BLP √x x x x
RLP x √x x x
Conductivity √ √ √x x