Chapter 3 Conductivity and Solubility

Chapter 3 Particular Properties

Chapter 3Write the Section Header Particular Properties in your notebook.

Update your Table of Contents with the correct page number.

Lets look at the chapter planner (p. 100)

Linking Question: How does the property of electrical conductivity sort materials into categories.

Key Idea: Characteristics of the charge of materials help classify matter.Particular PropertiesRead pages 104-105 (Explore Particular Properties)Notes: You will work in teams to investigate the properties of several common chemical compounds.You will organize the compounds based on the results of your investigation.You will learn what is happening at the microscopic level to explain your macroscopic observations.You will be performing 6 different tests on 8 compounds.You will use your observations and logic to sort the substances into groups with similar properties

Write down the Materials List from page 106 into your notebook (You dont need to include aprons and glasses but write down everything else!)

Please note: when the book says deicer, it really means de-icer

Please note: ADD vinegar to the list of materials.Particular PropertiesCreate a data table in your notebook to record your data. Think about how many columns and rows you will need to record all your data.

You will need 7 Columns and 9 Rows!Column Headers are: Compound Appearance Hardness Conductivity (as a solid) Solubility in H20 Conductivity (as a liquid/solution) Relative Melting Point

Particular PropertiesFill in the Compounds Column with the names of the 9 (NINE) compounds we will be testing.

You can find the list of compounds in YOUR notebook, under the Materials section!Check PointWhat were testing [from the book]:AspirinCornstarchDe-icerEpsom saltsCandle wax (paraffin)SugarTable saltVitamin CWe are testing [added to our list]:Vinegar

Short hair

Medium hairLong hairThere is a difference between measuring and comparing objects. If we felt compelled to group mammals according to hair length we could measure everyones hair or we could just estimate instead.

We can classify hair as short, medium, and long. We dont have to MEASURE the hair length in order to group the subjects. This is called a Relative Comparison.

If we spent the time to measure the average hair length on every mammal, we could group them more accurately but it would take a long time!

Relative Comparisons vs. Numerical MeasurementsThe Tests well run(homework if necessary)In each group:We are going to divide the tests into four groups: 1) Appearance and hardness2) Relative Solubility (of liquids and of solids)3) Melting Point4) ConductivityEach person pick one of the Protocols on pages 108-109. Draw a step-by-step cartoon of your test(s). This will serve as your procedure. Make sure to note any safety issues!

The person that drew the cartoon is the expert for that test do what they say! This person is called the Test Leader for that experiment.If you only have three people, one person should do the Appearance/Relative Hardness test AND another of their choice.Lab RulesWe will be using a butane torch to determine relative melting points.Long hair and loose clothing must be tied back.Do NOT operate the torch without an adult present. Anybody who is horsing around and not following directions will be removed from class with a detention and 0 for the lab.When you are done with your investigation, you must clean all your materials and return them to the kits.You must clean up your lab station.You must check out with me before leaving the lab. I will check your materials and station to make sure that they are returned to their starting condition.Lab Groups 4th PeriodGroup 1KaitlinMackenzieAshlandNicholasGroup 2AnaAldenMaddieGroup 3HarrisonJacobJulianneHyramGroup 4HannahEmmaEvanLab Groups 5th PeriodGroup 1Abby B.Andrew S.CodyCierraGroup 2Isaac B.CeciliaDana KGroup 3WhitneyStellaKelseyRileyGroup 4DaynaMirandaBriannaColtonGroup 5VeroniqueIsaac M.RebekahWillGroup 6ChaylaAnnieShaunTaylorGroup 7JacobTessMattGroup 8AnnaKatie K.AustinLab Groups 6th PeriodGroup 1SethReidTannerAnnaGroup 2Dylan B.CurtisAmeyaMaryGroup 3SofiaJakobMarkMasonGavinGroup 4SpencerJacob E.JimmyDylan S.Group 5AshleyJordanBradenJoelDay Two

Appearance TestFill in the Appearance column, using the Appearance Test Protocol.

Follow the instructions of the Test Leader for the Appearance test.

Paraffin Melting Test:

We will DEMO this instead of having each group test it cleaning the test tubes is a pain in the neck! :)

Epsom salt is NOT table salt! It is actually Magnesium sulfate, a compound containing magnesium, sulfur and oxygen. It is MgSO4.Kosher vs Table salt:Chemically there is little difference between kitchen salts. Both are at least 97% NaCl. But there are significant differences in the way they are made!Table salt is mined from underground salt deposits, and includes a small portion of calcium silicate to prevent clumping. Because of its fine grain a single teaspoon of table salt contains more salt than a tablespoon of kosher or sea salt. Kosher salt contains no preservatives and is often derived from seawater. It is particularly useful in preserving, because its large crystals draw moisture out of meats and other foods more effectively than other salts.!The Rest of the TestsComplete the remainder of the tests in any order you choose.

Follow the instructions of the Test Leader for each test.

Day 3

What do we do with the data?Categorize: try to make categories for your compounds. Can you find any patterns or trends???

Compare categories with other teamstry to come up with at least one statement that relates a category to conductivity.

Be awesome and save the world

CATEGORIZATION: dont do it with people, but do it with this stuffWhy does our room smell like marshmallows on a campfire???

Group Discussion TimeIn your table group, pick ONE categorization Present it to the class!CompoundAppearanceHardnessCond (as solid)Solubility in waterCond (as a liquid/sol.)Melting PointAspirinWhite powderSoftnoPartiallyWeakLowCornstarchWhite powderSoftNoPartiallyWeakLowDe-icerWhite crystalHardNoYesStrongHighEpsom saltsWhite crystalHardNoYesStrongHighParaffinopaqueSoftNoNoN/ALowSugarWhite crystalHardNoYesNoMediumSaltWhite crystalHardNoYesStrongHighVitamin cWhite powderHardNopartiallyWeakLowvinegarClear liquidN/ANoN/AweakN/AVideos of conductingSolid Sodium Chloride - Conductor, or Not???

Reflect/ConnectReflect/Connect:Reflect and Connect, p. 107-108, # 1-3Reading SidebarRead Electrical Conductivity, p 110-111Take notes as you go along.

Anything in this section is test-able do you feel comfortable that you took enough notes as you read???