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Tuesday, May 25, 2010

Class On Friday

In class Friday we went over the liquids and solids observed in a lab on Thursday. As a class we decided which substance was compound which was an element and which substance was a mixture. After everyone went up and wrote substance under where they thought it belonged we all went through to check each-others answers. This is what we ended up with:

In the table below the numbers next to the letters underneath "symbols/formlas" are meant to be down lower and smaller-like in this image-

REMINDER:
Quiz tuesday:
-over 3 parts in your book you read as homework
-your chart in the packet
-and the 2 sets of notes


Elements:

  • pure substance (simplest)
  • can't be divided
  • no "+"'s in formula
  • and has only one chemical symbol

Compounds:

  • pure substance
  • 2 or more elements combined chemically
  • has a ratio (always the same)
  • ONE chemical formula

Mixtures:

  • 2 or more elements involved
  • NOT CHEMICALLY combined
  • 2 or more chemical formulas
  • formulas have "+"'s

    TYPES OF MIXTURES:

    Homogeneous- uniform mixture, same throughout
    Ex.cedvita, mineral water, salt water

    Heterogeneous-not uniformed mixture, not same throughout
    (Looks like a salad. You can tell where the tomato is, where the lettuce is, where the cucumber is; it all stands out)
    Ex.soil

    Solution is a homogeneous mixture.
    2 parts:

    -Solute(what you have less of): part that dissolves

    -Solvent(what you have more of, and usually a liquid): dissolving part

    Examples-
    In salt water:
    solute-salt
    solvent-water

    In cedvita:
    solute-orange powder
    solvent-water

    In mineral water-
    solute-CO2(gas)
    solvent-H2O (liquid)


    Stated by Ms. D, "96% of the time H2O is the solvent"

    ONE LETTER ELEMENTS:
    O
    H
    N
    C

    TWO LETTER ELEMENTS:
    He
    Cu
    Au
    Fe
    Li
    Cr
    Ge


    THREE LETTER ELEMENTS:
    Une
    Uun
    Uuu
    And these are all, man-made solids, and last less than a second usually.

    ¬We also figured out how to read the substances formulas' using math.

    In the formula above there are 4 hydrogens, because you multiply H x 3 and you get 3 hydrogens. Then add the H at the beginning. and you get a total of 4.

    There are also 2 carbons and 2 oxygens used to create the substance.


    In case you want to look up more formulas, this is a cool site I used:

    http://www.chemindustry.com/apps/chemicals


    Next scriber is Severyn.

7 comments:

  1. Good job Alex,from reading this post I could understand what the 8th grade was doing in class and what the quiz would roughly be about. The link was helpful however it contained a lot of what I believe would be irrelevant information, but it is overall a good link. I believe that your grammar could have been clearer in some parts and that could use revision. I also believe that it would have been helpful (to people not familiar with this branch of science) to put the full name of the element after the abbreviation. Overall it was a great post and found it very interesting.

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  2. Alex - Your post definitely covers all of what we did during class. Plus it does so with good spelling, grammar and sentence structure. You have scientific vocabulary throughout and have explained it well. Your link to the "Chemistry for Life" site is interesting, but doesn't have much information that is helpful to 8th graders. The Rotation Lab table looks good and I am glad you added it as a Picassa image so it can be clicked on to be viewed bigger. The one area you forgot to do was a real-life relationship; the newest requirement for blogging during the fourth quarter. The font you chose was clear and the colors you used helped differentiate different sections we covered. Overall this is a well organized post. ~Ms. D.

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  3. Hi Alex,
    I think that your post was great overall because you managed to include many details about 8th grade science class. One good touch for your blogpost is the part where you quoted Ms.D. Your pictures and diagrams actually helped me know what the class was about and it also gave me a heads up about next years Science class. One thing you could improve is not using green on green. But other than that your blogpost was good.
    Reza

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  4. Hey Alex! I think your scribe post was great for many reasons. I liked the fact that you included science and organised your scribe neatley, because it made it easier to read. I liked the fact that you told the readers what Heterogeneous looks like and gave an example. Also, I think it was cool that you inserted a table, but next time you could tell the readers that the picture enlarges when clicked on, because it took me a while to figure that out. Overall, though, I liked your scribe very much.

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  5. Good job Alex
    I understud what your class is doing in science class. It was good that you riminded that you have a quiz on Tuesday. The pictuer was also useful. You could have writen the things in green in a different color because it is hard to read it on green background. It was nice that you put a quote Ms. D. said. Overall nice job.

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  6. Alex,
    I find that your post is very nicely laid out, and I might use it for studying for the final exam. The colors seem fine, maybe except the green, which is a little bit hard to read.
    You didn't write all of the elements for the number of letters in each, so I suppose they are just examples.
    As usual, I am going to end my post by saying that overall, you have done a nice job.

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  7. I actually did include all of the substances, but when uploading, for some reason the second page didn't load onto my post, so I just left it the way it is.
    :)alex

    ReplyDelete