Do Now Date: September 6, 2016 Objective: Classify metals, nonmetals, and metalloids based on their properties. Draw a table listing the properties of metals, nonmetals, and metalloids.
Tuesday, September 6, 2016 Today: W-Up, Notes & Practice, Density Activity HW: See www.breslyn.org for link.
To review Last week we looked at: Safety Bunsen Burner First 10 Elements Class Website Metals, Non-metals, & Metalloids
The Periodic Table Create a table to organize what we know about metals, nonmetals, and metalloids. You should have three things listed for each. From http://web.buddyproject.org/web017/web017/images/periodic%20table.jpg
Metals Properties:
Nonmetals Properties
Metalloids Properties:
Metalloids Boron Silicon Germanium Arsenic Antimony Tellurium Astantine
Why Classify? We classify elements based on their similarities. If is classified as a metal we ll already know a lot about its properties.
Classification
Classification
Why Classify? Make predictions. Help make comparisons. See patterns. Make better decisions.
Elements All elements are listed on the periodic table. (e.g. H, O, C, Fe, Mg ) The combine to form compounds. (H 2 O, C 2 H 6, Fe 2 O 3, MgO ) When they combine we call that a chemical reaction.
Mini-Lab: Density Challenge
H Hydrogen +1 He Helium No Charge Li Lithium +1 Be Beryllium +2 B Boron +3 C Carbon +4 or -4 N Nitrogen - 3 O Oxygen -2 F Fluorine -1 Ne Neon No Charge Warm-up Commit these elements to memory:
Atomic # 8 Group Six (aka 16) O Oxygen Found as O 2 in air called elemental oxygen. Forms -2 Ions
Atomic # 1 Group One H Hydrogen H 2 gas in nature Forms +1 Ions
Atomic # 5 B Boron Group Three (aka 13). Forms +3 Ions
Atomic # 4 Group Two Be Beryllium Forms +2 Ions
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Atomic # 2 He Helium Group Eight (aka 0) He gas in nature Does Not Form Ions
Atomic # 6 Group Four (aka 14) C Carbon Forms +4/-4 Ions
Atomic # 10 Group Eight/Zero Ne Neon Ne gas in nature Does Not Form Ions (Inert)
Atomic # 7 Group Five (aka 15) N Nitrogen N 2 gas in nature Forms 3 Ions
Atomic # 9 F Fluorine Group Seven (aka 17) Fluroine gas is F 2 Forms -1 Ions
Atomic # 3 Group One Lithium Li Reactive Metal Forms +1 Ions
The Periodic Table Create a table to organize what we know about metals, nonmetals, and metalloids.?? You should have three things listed for each.? From http://web.buddyproject.org/web017/web017/images/periodic%20table.jpg
Elements The periodic table lists all of the known elements. Elements are the simplest form of matter (under normal conditions).
Compounds Nitratine NaNO 3 xdf Photo from: http://www.theodoregray.com /PeriodicTable/Elements/011/i ndex.s7.html
Compounds Sodalite Na 4 Al 3 Si 3 O 12 Cl xdf Photo from: http://www.theodoregray.com /PeriodicTable/Elements/011/i ndex.s7.html
Compounds Starting bid: US $5.95 Time left: 3 hours 27 mins 7-day listing Ends Aug-07-04 13:42:24 PDT Add to Calendar Start time: Jul-31-04 13:42:24 PDT History: 0 bids Price: US $7.00 Sodalite Na 4 Al 3 Si 3 O 12 Cl Photo from: http://cgi.ebay.com/
Elements & Compounds Are there more elements or compounds in the universe?
Do Now Date: September 7, 2016 Objective: Determine the density of an object to the appropriate significant figures. Copy & Complete: Density = mass / volume. Calculate the density of an 25.0 gram block of metal that occupies 10.0 ml of space.
Wednesday, September 7, 2016 Today: W-Up, Notes: Significant Figures, Lab: Determining Density HW: Finish Lab
Which weighs more Photo from http://seis.natsci.csulb.edu/bperry/metaconglhandsample2.jpg Photo from http://www.stecf.org/~rfosbury/home/natural_colour/feathers
How you report your data. Only report numbers you can actually read on the lab instruments! The least accurate instrument determines the number of sig figs you can have in your answer.
Meniscus Be sure to read the graduated cylinder at the bottom of the meniscus.
Electronic Balance
Electronic Balance Image from http://www.h-spot.net/watches/luch_3055_mvt.jpg
What s Significant? Include the number marked on the instrument plus one additional digit that you estimate. On electronic balances you can report the numbers show on the screen.
How you report your data. So A student finds the mass of an object to be 12.1g and the volume to be 34.32 ml. They calculate the density to be 0.3525641 g/ml. What s wrong here?
Significant Figures Two perspectives how you report your data, and how you read someone else s data.
Meniscus Be sure to read the graduated cylinder at the bottom of the meniscus.
Try this one.
Meniscus Be sure to read the graduated cylinder at the bottom of the meniscus.
Meniscus Be sure to read the graduated cylinder at the bottom of the meniscus.
An Example A plastic graduated cylinder has 1 ml calibration marks. What kind of numbers should you record? a) 34 ml b) 34.1 ml c) 34. 11 ml
How you read someone else s data. Big Idea: Sig figs give us a way of clearly communicating the accuracy of our data.
Practice on the web http://science.widener.edu/svb/tutorial/sigfigures.html
Activity: Determining Density Each group must turn in one page with the title, purpose, data table (3 trials), calculations, and conclusion. The conclusion will be what you determined to be the density of the metal (include calculations and units). We will share these with the class. Put both partners names on the paper. Remember: the units for density are g/ml
Percent Error Accepted Value for Copper is 8.37 g/cm 3 Use formula in your notes. Remember: -- accepted value (also called known value) -- experimental value Also, Accepted Value for Copper is 8.37 g/cm 3 x and -x both = x
Practice: Percent Error A student measures the mass and volume of a piece of copper in the laboratory and uses his data to calculate the density of the metal. According to his results, copper has a density of 8.37 g/cm3. Curious about the accuracy of his results, the student consults a reference table and finds that the accepted value for the density of copper is 8.92 g/cm 3. What would be the student's percent error?
Practice: Percent Error Error = accepted value experimental value (8.92 g/cm3-8.37 g/cm3) error Percent Error = x 100 accepted value = 8.92g/cm3-8.37 g/cm3 8.92 g/cm3 = 6.17%
You re given three samples of pure copper. Sample 1: 207 g Sample 2: 1037 g Sample 3: 8 g How will the density differ? Compete: An extrinsic property, like density
Do Now Date: September 8, 2016 Objective: Describe and apply the Law of Conservation of Mass. Copy & Complete: The Law of Conservation of Mass states that we cannot create or destroy matter. In your own words, what does that mean?
Thursday, September 8, 2016 Today: W-Up, Discussion: Metals/NonMetals, Notes: Conservation of Mass, Quiz Homework: Check Edline
Warm-Up: Determine the Density Mass of substance: 48 grams Volume of substance: 96 ml What is the density? When placed in water, will it float?
Will it float? A substance was determined to have a mass of 3.2 grams. It s volume was 3.0 ml. When placed in water, will it float?
Conservation of Mass/Matter
W-Up: Hand Warmers What do we know about hand warmers?
W-Up: Hand Warmers How is the heat produced? Can we stop the heat from being produced? How can you test these ideas?
W-Up: Conservation of Mass Fe(s) + O 2 (g) Fe 2 O 3 (s) Before Reactants After Products
Conservation of Mass Conservation of Mass: Matter cannot be created or destroyed. Applies to any physical or chemical reaction. If you carefully measure the reactants before a reaction, and the products afterwards, the masses will be the same.
Conservation of Mass Does burning a match obey the law of Conservation of Mass? Does a tree growing obey the lab of Conservation of Mass?
Conservation of Matter
Conservation of Mass Source: http://www.trekearth.com/gallery/africa/madagascar/north/mahajanga/morondave/photo585891.htm
. Biosphere 2
Carbon Cycle Without using your phone or the web, draw and label a diagram of the carbon cycle. Answer the following: 1. How does the carbon cycle relate to the law of conservation of matter? 2. How does the carbon cycle relate to climate change?
What are they trying to show here? -----
H Hydrogen +1 He Helium No Charge Li Lithium +1 Be Beryllium +2 B Boron +3 C Carbon +4 or -4 N Nitrogen - 3 O Oxygen -2 F Fluorine -1 Ne Neon No Charge Memory Commit these elements to memory:
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Do Now Date: September 9, 2016 Objective: Separate two liquids based on differences in their boiling points. Copy & Complete: Water boils at degrees Celsius. Ethanol boils at about ºC.
Friday, September 9, 2016 Today: Demo, Notes & Practice: Distillation Homework: Study Notes and Book
W-Up: Separating Alcohol and H 2 O H 2 O boils at 100 Celsius. CH 3 CH 2 OH boils at 78 Celsius. How can we separate a mixture of alcohol and water?
Distillation Animation from: http://phys.free.fr/technic.htm
Distillation see p13 in your book. W From http://library.tedankara.k12.tr/chemistry/vol2/colligative%20properties/z8.htm
Separating and H 2 O & Food Coloring Okay to substitute soda or Gatorade. Set up the apparatus shown below: Large Beaker
Separating Food Coloring and H 2 O Make sure not plastic wrap is touching the hot plate! Turn the hot plate to under 100 degrees. The water should not be boiling! Once you have collected some distillate turn off the hot plate and carefully remove the apparatus. Let cool 3 minutes. Once cool, remove the small beaker and bring the distillate to Dr. B for a sign-off.
Fractional Distillation Used to separate the components of crude oil. Photo from: http://www.wsgfl.org.uk/schools/sackville_www/extranet/oil2/refin2.htm
Industrial Use Photo from: http://cougar.slvhs.slv.k12.ca.us/~pboomer/chemlectures/organic/organic2.html
Products from Crude Oil Plastics, gasoline, heating oil, asphalt, pharmaceuticals, asphalt tar,
Demo: Distillation Key Points Differences in boiling points (a physical property allow us to separate a mixture of liquids. We are not breaking apart any compounds! Distillation is a very, very important industrial process.
How would you Separate the electrolytes and sugar from the water in Gatorade? Hint: Water boils at 100 C. Electrolytes (salts) and sugar boil at much higher temperatures.
Additional Content
Explain the differences between an element and a compound. In your response include: ---A description of each (diagrams are helpful). ---Examples of elements and compounds. ---And, the evidence you could use to distinguish between elements and compounds. Describe the advantages of a well-organized system of classification. In your response include: --- Why it is useful to classify things. --- How we decide how to classify things. --- And example of a classification system (it does not have to be a chemical classification system but your example needs to be detailed).