Someone teach me chemistry.

Discussion in 'Community Discussion' started by Hummer, Jun 17, 2007.

  1. Hummer macrumors 65816

    Hummer

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    Feb 3, 2006
    Location:
    Queens, New York NY-5
    #1
    I have to take a Chemistry regents exam this wednesday and I think I'm on the verge of failing because I don't remember anything from topic one. All I remember is the stuff we learned at the end of the year.

    Do you guys have any tips or things to remember?

    The general format of the exam is below they change up the order of most of the questions, the questions themselves generally stay the same with different situations.

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  2. Jasonbot macrumors 68020

    Jasonbot

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    Aug 15, 2006
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    The Rainbow Nation RSA
    #2
    I could help with some of those questions but this blog taught me chemistry pretty well. So well that I in fact bookmarked it!

    EDIT: I know how hectic Chemistry can be so i really hope you get all the help you need!
     
  3. TequilaBoobs macrumors 6502a

    TequilaBoobs

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    Nov 12, 2006
    #3
    whats so bad aboot failing chemistry regents? whens the last time you used chemistry in your life? :confused: :eek:
     
  4. Hummer thread starter macrumors 65816

    Hummer

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    Queens, New York NY-5
    #4
    :p , according to my school if I fail it I have to take it over and over until I pass. The first time I fail they make me pay for review classes to take the August one or they kick me out if I refuse.
     
  5. TequilaBoobs macrumors 6502a

    TequilaBoobs

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    #5
    who told you school was important? did you know bill gates dropped out of school? look where he is at, now...
     
  6. kidwithdimples macrumors 6502a

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    Jun 17, 2007
    #6
    Dude!

    I feel your pain. I took Chemistry Regents last year and I passed with a 66. It was freaking hard and I took Math B Regents 2 days ago. I gave up in the middle of the exam. I'm going to retake it on August again.

    You should have paid attention in class. It's really imporant and attend tutoring if you know you are not going to do well. I was just lucky.

    P.S: Wow! You are from Queens? I'm from Astoria :p
     
  7. Hummer thread starter macrumors 65816

    Hummer

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    Feb 3, 2006
    Location:
    Queens, New York NY-5
    #7
    He dropped out of college, not high school.

    But you're right all the money spent on high school and college could be put into starting a business.

    My friends took the Math B regents they all said it was EXTREMELY hard (I dropped math for a reason :p). One friend failed it three times.

    Good luck on your US history regents tuesday.
     
  8. bigiffo macrumors member

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    Jun 16, 2007
    #8
    Is "regents" like IGCSE, GCSE, O level? Taken at around 16 years?
     
  9. Hummer thread starter macrumors 65816

    Hummer

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    #9
    Well the regents are given throughout highschool and in some junior highschools. Anyone can take them at any time.
     
  10. kidwithdimples macrumors 6502a

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    Jun 17, 2007
    #10
    Yep. "Regents" are like state exams or standardized exams. It tests your knowledge on what you learned throughout the entire school year. The passing grade is a 65 and if you get an 85 then it's called "mastery" on the regents.
     
  11. bigiffo macrumors member

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    Jun 16, 2007
    #11
    for your first question mass number is neutrons+protons. (Everything inside the nucleus.) So that is the bigger number and that is normally at the top of the cells in periodic tables, however it can be at the bottom. There must be some good regent exam text books. So Q1 is 1, Q2 is K (potassium because it is one of the very reactive metals along with Calcium, Sodium, cesium etc.)
     
  12. TequilaBoobs macrumors 6502a

    TequilaBoobs

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    Nov 12, 2006
    #12
    regents tests are really easy, they just wanna know you know a minimal amount before moving you to the next grade. i dont wanna brag, but i always got 99 on all my regents (thats like the highest)... okay that was bragging but w/e
     
  13. bigiffo macrumors member

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    Jun 16, 2007
    #13
    Q3 is tin because all the other options are non-metals.
     
  14. tinydragon123 macrumors member

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    Sep 25, 2005
    Location:
    San Diego
    #14
    I'm going to try and give this a go.

    1. 1 because Na is the element symbol and the atomic number is on side at the bottom while the mass is on the top.

    2. 4. Sr because Ca and it are on the second column together, thus they are in the same family (Alkali earth metals) with similar chemical properties.

    3. 4. Tin is a metal, thus it is malleable. THe others are nonmetals.

    4. 2. Isotopes differ in neutrons. Ions, on the other hand, differ in electrons.

    5. Not sure. O2 is a oxygen in diatomic form. O3 is ozone.

    6. 3. Fe 2+ and S 2-. Cross the electrons and you should get FeS. Thus, iti si Iron (II) Sulfide.

    7. 2. It is 1:2 because for every one mole of H2, you produuce 2 moles of HF.

    8. Process of elimination. It can't be 1 and 2 because condensation concerns intermolecular forces, not chemical reactions. 4 is wrong as well. Answer is 3.

    9. 2. Ionic b/c metals give the nonmetal the electrons. Metallic bonds have a sea of electrons and covalent shares.

    10. I can't tell if that is a triple bond b/c the pic is too small. If it is, the answer is 1: 6 electrons.

    11. 2. H-Cl is non polar.

    31. As you go down the periodic table, the atomic radii increases, thus 1 and 3 are eliminated. And I think as you go down, the metallic properties increases because there are metals at the bottom. Ths the answer I choose is 4.

    32. I think this is a typo. S2- should have 8 electrons...I don't know what is the answer then.

    33. To find the molecular formula, find the mass of CH2 and then divide it by what you were given for the mass, which is 56 grams. You should get a ratio of 4. Thus muliply the formula by 4. CH2 will become C4H8, which is 3.

    34. 4. The atomic number means the number of electrons and protons. P is #15 and S is #16.

    35. 3. There is only one Cl atom in all formulas. The mass of Cl is 35.5. Thius, you have to divide the mass of Cl by the mass given. 3 is correct because 35.5/84 is .42. Mulitply that by 100 and you get 42%.

    36. 1. M^X with O^2-. You can only have one + for a metal in order to get M2O. Thus, the metal has to be in the first group to have 1+.

    37. The answer has to be either 3 or 4. However, 3 is wrong because it is compact, which means it is a solid. Since the question is CO(GAS), the naswer is 4 because gas is free.

    38. I forgot how to do this one.

    I'm tired. Hope this helps. If you need anything, feel free to message me. I took AP chemistry this year and I did pretty well. Hopefully I did the questions correctly.

    Good luck on your test. The AP test for me wasn't that hard. I'm taking my chemistry placement test for college next week online. So thank you for giving me a practice test. =]
     
  15. TequilaBoobs macrumors 6502a

    TequilaBoobs

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    Nov 12, 2006
    #15
    NERD ALERT :eek:
     
  16. bigiffo macrumors member

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    Jun 16, 2007
    #16
    oh, Q4 is neutrons. If you change the number of protons this will automatically change the number of electrons.
     
  17. zap2 macrumors 604

    zap2

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    Mar 8, 2005
    Location:
    Washington D.C
    #17
    An Acid and Base always make a Salt(plus some other stuff)


    And thats all I remember from Chem
     
  18. bigiffo macrumors member

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    Jun 16, 2007
    #18
    i think ozone is different in properties because it is dangerous for us. And as with many other chemicals, Water for example, doesn't explode when you put a match to it whereas hydrogen and oxygen do, Water has a complete outer shell of electrons. Ozone has a different makeup of electrons from normal oxygen (O2).
    PS Does anyone know how to do subscript?

    No s2- is 14 as it has lost two electrons- it is an ION. Sulphur normally has 16 electrons.

    I'm not 100% sure but i think 34 is 3 because if you add another PROTON you the element will change to the next element on the periodic table. I think that might be chlorine?

    A good thing to remember is a more reactive metal displaces a less reactive metal from a compound.
    Metal Oxides are Basic/Alkaline Oxides.
    Non-Metal Oxides are Acid Oxides.
    Non-metal oxides are normally gases.
    test for hydrogen: burns with squeaky pop when lit splint put next to it. Please note- oxygen must be present.
    test for water- anhydrous copper sulphate- pink or white goes blue when water is present.
    Q10 is 6 electrons. The guy above couldn't see.
     
  19. tinydragon123 macrumors member

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    Sep 25, 2005
    Location:
    San Diego
    #19
    What can I say? I love chemistry. And hey, I need the practice.
     
  20. bigiffo macrumors member

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    Jun 16, 2007
    #20
    the answer is 4 because it the compound is a gas and it is Carbon MONoxide. (one oxygen atom.)

    Please someone tell me how to type subscript!?:confused:
     
  21. kidwithdimples macrumors 6502a

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    Jun 17, 2007
    #21
    You make me laugh. It's easy to say something. but not that easy to prove it. It's impossible to get 99 on every regents because in certain subjects (For example: Math B), you don't get enough school year time to finish the whole curriculum.

    I would love to see your regents grade. :D
     
  22. TheAnswer macrumors 68030

    TheAnswer

    Joined:
    Jan 25, 2002
    Location:
    Orange County, CA
    #22
    The forum software doesn't have a built in way to do it. Perhaps just change the color of the subscript #'s and remind us in the post that the colored numbers are subscript, a la H2O for water.
     
  23. TequilaBoobs macrumors 6502a

    TequilaBoobs

    Joined:
    Nov 12, 2006
    #23
    trust me my friend, im in the 1% bracket hehe
    but seriously, regents for me was a decade ago so i dont have copies. i laughed at the test because even if i tried to fail i would still pass. everyone in my highschool got like 99% (stuyvesant) and if you didnt, you were tarred and feathered. :p
     
  24. biturbomunkie macrumors 6502a

    Joined:
    Jul 30, 2006
    Location:
    cali
    #24
    i.) stay off the internet! esp. MR! for reals! :D

    ii.) practice makes perfect. from Q1 it seems like you are taking the first series of gen chem, which mostly involves stoichiometry, balancing EQNs, p-table trends, ideal gas, nomenclature, etc. while there are a few theories that you should be familiar of, there really isn't much to memorize (assuming solubility rules and EQNs are given). so i'd do as many practice exams as possible.

    iii.) predict free responses. try to think of one free response that unites what you've learned from the class (i.e. explain an observation from both micro and macro view). explain/compare theories (i.e. plum pudding vs. gold foil)? a question that tests you from nomenclature, balancing EQN, and then stoichiometry is also likely.

    iv.) be sure to get enough sleep the night before the final!

    good luck! =)
     
  25. bigiffo macrumors member

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    Jun 16, 2007
    #25
    A good book, for GCSE, which seems similar is nelson thornes chemistry. It may not be relevant or easy to get hold of. It got me through GCSE!
    :cool:
     

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