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March 26, 2017

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1. A solution in which no more solid can be dissoved is referred to as ____.
Answer: saturated

2.At constant pressure, heat can be referred to as (entropy, enthalpy, or free energy). Answer: enthalpy

The measure of disorder or randomness of a system is(entropy, enthalpy, or free energy). Answer: entropy

The spontaneity of a reaction is indicated by the direction of change of a system's(entropy, enthalpy, or free energy). Answer: free energy

3.The color of bromocresol green indicator is ______when pH < 4, green when pH 4- 5.3 and ______in pH > 5.3.
first blank =yellow 2nd blank= blue

4.Na2B4O7+ 10H2O(s) 2Na+ (aq) + B4O5(OH)42–(aq) + 8H2O(l)

The sign of (delta)Ssys will be
A. postive
B. negative
answer:negative

because there are..
A.more
B. less
answer: more
moles of product generated.

5.The solubility of borax is directly proportional to temperature. Therefore, the sign of (delta)H is..
A. negative
B. postive
C. unknown with the given information.
answer: C.

THANK YOU!

  • Chemistry- HWK CHECK - ,

    all correct.

  • Chemistry- HWK CHECK - ,

    #4 i put negative but i got it wrong

  • Chemistry- HWK CHECK - ,

    the answer to #4 should be POSITIVE & MORE ... the more moles produced, the greater the entropy, thus higher delta S

  • Chemistry- HWK CHECK - ,

    5 is c

  • Chemistry- HWK CHECK - ,

    5 is B

  • Chemistry- HWK CHECK - ,

    yea, #5 is fosho B

  • Chemistry- HWK CHECK - ,

    thanks a lot. i got #5 wrong. it's not B

  • Chemistry- HWK CHECK - ,

    The answer is B. 100%

  • Chemistry- HWK CHECK - ,

    LIES!!!!!!!!!!!!

  • Chemistry- HWK CHECK - ,

    5 is A

  • Chemistry- HWK CHECK - ,

    no 5 is c!

  • Chemistry- HWK CHECK - ,

    NO!!! ARE YOU RETARDED? ITS B!!!

  • Chemistry- HWK CHECK - ,

    wow... there are so many idiots on this sites because the answer is D!!!

  • Chemistry- HWK CHECK - ,

    okay forget what everyone else is saying. i just submitted my answer and B IS RIGHT. TRUST ME :)

  • Chemistry- HWK CHECK - ,

    i am not an iddiot

  • Chemistry- HWK CHECK - ,

    all of you who says B are just trying to screw everyone else's hw score over -__-

  • Chemistry- HWK CHECK - ,

    I didn't even bother reading the opinions about number 5 because they were too annoying, so I just thought about it myself and B, positive, is definitely the right choice because if borax is directly proportional to temperature, that means the more heat we add, the more the borax will dissolve in the water. When you add heat to a reaction, it makes the reaction endothermic and is therefore a positive delta H. If a reactions loses heat then it is a negative delta H. Oh and I just submitted it, and B positive is right.

  • Chemistry- HWK CHECK - ,

    (4 pts) The concentration and volume of reagents combined in each trial are listed in the table below:
    Trial 00020 M 00020 M H2O(mL)
    Fe(NO3)3 (mL) KSCN (mL)
    1 5 2 3
    2 5 3 2
    3 5 4 1
    4 5 5 0

    Initially (right after combining and before any reaction occurs) the concentration of SCN– in trial 1 is
    M.

  • Chemistry- HWK CHECK - ,

    I put C for #5 and got it wrong it is not C

  • Chemistry- HWK CHECK - ,

    not so helpful peers lol

  • Chemistry- HWK CHECK - ,

    No u guys 5 really is B.. I wish i read these coments before putting C.. I regret it cuz C was seriouslyy wrong.. its positive. =D y would i try to screw everyone??? that's just mean.

  • Chemistry- HWK CHECK - ,

    5 is positive

  • Chemistry- HWK CHECK - ,

    5 is def. not c..i got it wrong

  • Chemistry- HWK CHECK - ,

    5 is positive! for me, positive was a. that's probably why some people got it wrong (:

  • Chemistry- HWK CHECK - ,

    5 is B. I really find it mean that people deliberately put the wrong answers on this site. Is the pursuit of a decimal's worth of increased standing in the class distribution really worth lessening your character? Why can't we just help each other out fairly?

  • Chemistry- HWK CHECK - ,

    #5: is Positive. It's not A, B, or C. Your question may be worded differently. But the correct answer should be "positive" for change in enthalpy. I did the lab, and my calculation supports it!

  • Chemistry- HWK CHECK - ,

    At constant pressure, heat can be referred to as (entropy) Read about entropy

    The measure of disorder or randomness of a system is . (ethalpy) Definition of Entropy

    The spontaneity of a reaction is indicated by the direction of change of a system's (free energy) Process of elimination if you want

    Solid borax dissolves in water according to the equation:
    Na2B4O7 10H2O(s) 2Na+ (aq) + B4O5(OH)42–(aq) + 8H2O(l)

    The sign of Ssys will be If dS>0 then more molecules are produced. Look at the eqauation, 1 mole to start and 11 to finish. Go back to the definition of entropy about disorder.
    A. positive


    because there are: Simple math 1 to 11 moles
    A. more

    The solubility of borax is directly proportional to temperature. Therefore, the sign of H is: We added heat so it is endothermic. Endothermic reactions are +. Exo is negative.
    A. positive

    Note: You can earn partial credit on this problem.



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    Don't listen to majority of the comments. I am 100% correct.

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