January 31, 2015

Homework Help: Chemistry- HWK CHECK

Posted by Blair on Monday, August 4, 2008 at 9:10pm.

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

because there are..
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.


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