formation of precipitate lab & m.o.m. color lab
Post on 13-Jan-2016
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Formation of Precipitate Lab& M.O.M. Color Lab
Signs of Chemical Change
• There are a number of observations that indicate a chemical reaction has occurred.
• Today you will observe some signs of chemical change in a lab.
Formation of PrecipitateOne is the formation of a precipitate. A precipitate
is a solid formed in a chemical reaction that is different from either of the reactants.
Liquid + Liquid New Solid formed
First set up your journal:Title: Precipitate Lab
Guiding Question: How do I know a chemical change happened?
Chart:
I notice…. I wonder….
Next…
• Write in your I Notice chart what you observe about your materials.
• Draw a picture of what everything looks like Before we test. Label your picture “Before”
Then…
• Add a few drops of solution A to solution B using the pipette (a fancy word for dropper).
• In your journal write what you Notice and what you Wonder. Look closely.
• Illustrate what you see After mixing. Label your picture “After”
Color ChangeA color change may also indicate that a
chemical reaction has occurred. A reaction has occurred if two solutions are mixed and there is a color change that is not simply the result of a dilution of one of the reactant solutions. We call this an unexpected color change.
Set up a New pg in your Journal…
Title: M.O.M. Colors Lab
Guiding Questions: What type of change happens in this lab? Explain how you know it is a physical or chemical change?
Chart:
I notice…. I wonder….
Then…
• Observe what materials you are going to use and write about them in your I Notice chart.
• Draw a Before picture and label it “before”.
Next…
• You will need to measure 20 mL of vinegar in the graduated cylinder.
• When you have 20 mL- pour the vinegar into the M.O.M. solution.
• Observe what happens and write about what you see in your I notice… I wonder… chart.
• Draw a picture of what you saw and label it “after”.
Finally…
• You will need to measure 20 mL of vinegar in a graduated cylinder again.
• Pour the 20 mL of vinegar into the M.O.M. solution one last time to see what happens.
• Draw and write what you saw.
• How can we change this lab?• Answer your Guiding Questions for your ticket out! Show
them to your teacher after you clean up.
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