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We All Scream for Ice Cream: Colligative Properties of Matter. Initial Observations and Student Inquiries Based upon Properties of Matter – Lesson 18: Changing Mixtures Addresses State Standards Sci 6-8 PS2 B , Sci 6-8 INQA, and Sci 6-8 INQD (Original ideas from Ramey and Wong – 2006). - PowerPoint PPT Presentation
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Initial Observations and Student Inquiries
Based upon Properties of Matter – Lesson 18: Changing MixturesAddresses State Standards
Sci 6-8 PS2B, Sci 6-8 INQA, and Sci 6-8 INQD
(Original ideas from Ramey and Wong – 2006)
We All Scream for Ice Cream: Colligative Properties of Matter
Goals Participants will describe the process of making ice cream and
develop an experiment using the scientific method to test a research question.
Know: How ice cream is made and how does table salt effect pure water.
Do: Develop an experiment to test a hypothesis. Engage: Page Keeley Assessment ProbeExplore: Difference between purified water and tap water –
Boiling Points and Freezing PointsExplain: Boiling and Freezing Water Lab ActivitiesElaborate: We All Scream For Ice Cream–Inquiries in Aqueous
Table Salt Solution and Making Ice CreamEvaluate: Translating Kinetic Molecular Motion from an Ice
Cream PerspectiveDebrief
Outline
From Uncovering Student Ideas in Physical Science by Page Keeley and Rand Harrington, Vol 2 - page 53
Engage: What do you think?
Crumple your papers and throw them to the middle of the room.
Retrieve someone else’s paper from the center of the room...if it is yours, then crumple and throw it in again.
Align yourself within the room according to the answer on the paper you picked up: A, B, or C
Align yourself in regards to whether YOU AGREE, DISAGREE, or DON’T KNOW with the answer.
CONSIDER THAT THE WATER IS NOT PURE BUT IS TAP WATER INSTEAD:DO YOU THINK THE TAP WATER WOULD BEHAVE IN
THE SAME MANNER AS THE PURE WATER? WHAT ABOUT THE FREEZING POINT OF EITHER
PURE OR TAP WATER?
Engage: What do you think?
Let’s observe the boiling point temperatures of Wenatchee Tap Water and Deionized/Distilled Water from the local convenience store.
What do you observe?Differences ListSimilarities List
Explore : Difference between purified water and tap water
Perform the Boiling Water ActivityPARTICIPANTS SHARE OUT TO CLASS
Perform the Freezing Water ActivityPARTICIPANTS SHARE OUT TO CLASS
Explain: Boiling and Freezing Water LAB Activities
SolutionA solution is made up of at least two components:
Solvent – the major component in a solutionSolute(s) – the dissolved component(s) in a
solution
High School Chemistry Knowledge Alert:A homogeneous mixture of solute and solvent
particles that may or may not have covalent, polar, or ionic molecular interaction.
Colligative Properties…when there are observed changes in
physical properties of a pure solvent due to a collection of dissolved solute particles within the entire solution.
High School Chemistry Knowledge Alert:Colligative Properties are not due to a
CHEMICAL CHANGE.Colligative properties are due to the collection
of dissolved solute particles that make small PHYSICAL CHANGES to the physical properties of the solvent!
SAY WHAT?Where do I observe “Colligative
Properties”?
http://www.uni.edu/%7Eiowawet/H2OProperties.html
Colligative Properties
Boiling-point elevationFreezing-point depressionVapor pressureOsmotic pressure
Colligative Properties – Still struggling?Where the rubber hits the road…
Solutions have different properties than either the pure solvent or the solute. For example, a solution of sugar in water is neither crystalline like sugar nor tasteless like water.Some of the properties unique to solutions depend only on the number of dissolved particles and not their identity. Such properties are called colligative properties.
http://www.sparknotes.com/chemistry/solutions/colligative/summary.html
Perform the Ice Cream Inquiries ExperimentSHARE OUT Experiments/Experiences AS
CLASS
Elaborate: We All Scream For Ice Cream
Perform the Ice Cream Inquiries ExperimentSHARE OUT Experiments/Experiences AS
CLASS
Colligative Properties MACRO Simulator:http://group.chem.iastate.edu//Greenbowe/secti
ons/projectfolder/flashfiles/propOfSoln/colligative.html
andhttp://antoine.frostburg.edu/chem/senese/101/s
olutions/faq/why-salt-melts-ice.shtml
Elaborate: We All Scream For Ice Cream
Perform the Ice Cream Inquiries ExperimentSHARE OUT Experiments/Experiences AS
CLASS
Colligative Properties MACRO Simulator:http://group.chem.iastate.edu//Greenbowe/secti
ons/projectfolder/flashfiles/propOfSoln/colligative.html
andhttp://antoine.frostburg.edu/chem/senese/101/s
olutions/faq/why-salt-melts-ice.shtml
Practical Applications Melting ice on your sidewalkCooking your pasta noodles
Elaborate: We All Scream For Ice Cream
From Uncovering Student Ideas in Physical Science by Page Keeley and Rand Harrington, Vol 4 – page 45
Evaluate: What do you think?
Crumple your papers and throw them to the middle of the room.
Retrieve someone else’s paper from the center of the room..if it is yours, then crumple and throw it in again.
Align yourself within the room according to the answer on the paper you picked up: A, B, or C
Align yourself in regards to whether YOU AGREE, DISAGREE, or DON’T KNOW with the answer.
What do you think?