Chemistry - February 2007

a) For the reaction CO2(g) → CO2(s)
entropy increases


b) For the reaction NaCl(s) + H2O(l) → NaCl(aq)
entropy increases


c) Molecules Cl2(g) should have have greater
entropy per mole, than molecules of SO2(g)


d) If entropy decreases for a certain process, the entropy of the universe increases

2007-02-23 14:59:09 · 3 answers · asked by Anonymous

how the calculation?
what salt use?
how to apply Handerson Hansberg equation?(not so sure this spelling)

2007-02-23 14:48:19 · 2 answers · asked by balqis 1

2007-02-23 14:32:29 · 3 answers · asked by Brandon K 1

For the reaction whose reactants and products are:



reactants: H2S (g) O2 (g)


products: H2O (g) SO2 (g)



1. calculate the standard entropy change (J/mol-K).

2. Calculate ΔSuniv in J/mol-K for the above process at 298.15 K.



The answer depends on how you balance the equation. For this question balance the equation using the smallest ratio of WHOLE numbers.

2007-02-23 14:25:47 · 2 answers · asked by Russell M 1

what are these different atoms called?

2007-02-23 14:21:21 · 8 answers · asked by Anonymous

say it is 50 degree's in the pool and 50 degrees outside... why would a pool be colder ,or feel colder, if it is the same temperature????? if you understand the answer.. please answer...

2007-02-23 14:17:54 · 4 answers · asked by Anonymous

polar or nonpolar?

2007-02-23 14:11:19 · 1 answers · asked by Anonymous

love.. what is it? in science terms?



- j

2007-02-23 14:11:16 · 7 answers · asked by Anonymous

2007-02-23 14:01:26 · 1 answers · asked by henry f 2

2007-02-23 13:54:43 · 1 answers · asked by henry f 2

According to Hund's rule of maximum spin multiplicity, how many singly-occupied orbitals are there in the valence shells of the following elements in their ground states? Enter your answer as the sum of all the orbitals (for example 15).
A) beryllium
B) nickel
C) chlorine
D) neon
E) scandium
F) germanium

2007-02-23 13:53:56 · 2 answers · asked by adam s 1

What is the total number of orbitals in the principal quantum level n = 5 of an atom?

for exam review...plz help

2007-02-23 13:53:26 · 3 answers · asked by adam s 1

What is the number of individual atomic orbitals in each of the following sets? A) 2p B) 6f C) 7p D) 4s Enter your answer with integers separated by commas and with no spaces (for example, 3,3,1).

for exam review plz help

2007-02-23 13:51:25 · 2 answers · asked by aks s 1

What is the wavelength of an electromagnetic wave the velocity of which is 3.0E+10 cm/sec and the frequency of which is 2.9E+12 Hz? Enter your answer as a length in cm.

exam review Question....need help

2007-02-23 13:49:39 · 1 answers · asked by aks s 1

2007-02-23 13:49:11 · 1 answers · asked by henry f 2

2007-02-23 13:43:57 · 6 answers · asked by henry f 2

Question: Which of the following processes can be used to separate the mixture of dyes in brown smarties?

a) chromatography
b) filtration
c) distillation
d) evaporation
e) decantation

Note: I think the answer is a, chromatography. Is this correct?

Question 2:
The ancients were able to convert certain blue and green rocks into copper. Is this the same process as changing ice into water? Explain.

Note: How would I write about 2 or 3 sentences on this? This is a chemical process not a physical process such as changing ice into water. Is this correct?

Question 3:
When the calcium atom forms its ion
a) the mass number is unchanged
b) it gains two electrons
c) it loses two electrons
d) it achieves the electronic configuration of neon
e) it loses two protons

Question 4:
If an atom of an element has 69 neutrons and 50 electrons, its mass number is
a) 119
b) 69
c) 50
d) 19
e) none of these

Thanks for your help.

2007-02-23 13:38:09 · 1 answers · asked by Anonymous

2007-02-23 13:16:23 · 8 answers · asked by BabyYneth 1

Is elimination or substitution favoured in more polar medium?
What happens when primary halides are treated with
aqueous KOH
alcoholic KOH

2007-02-23 13:10:09 · 4 answers · asked by Anonymous

2007-02-23 13:09:52 · 3 answers · asked by BabyYneth 1

2007-02-23 13:08:53 · 1 answers · asked by FOON YUI Y 1

2007-02-23 13:07:32 · 1 answers · asked by FOON YUI Y 1

2007-02-23 13:06:58 · 9 answers · asked by BabyYneth 1

the unknown di protic acid has an equivalent weight of 139.42 g/equiv, its average molecular weight is
g/mol and g would be required to make 100.00 mL of a 1.50 N solution.


2

If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration
for the standardized base will be

(low, high, or unaffected)
A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins the titration that drop falls into the KHP solution. The calculated concentration for the standardized base wil be
(low, high, or unaffected)

2007-02-23 13:03:12 · 2 answers · asked by luckystar21 1

2007-02-23 13:02:08 · 2 answers · asked by Anonymous

2007-02-23 12:37:15 · 3 answers · asked by BabyYneth 1

What is the volume of 175 mL of oxygen gas at 91.5°C and 620. mm Hg if the conditions are adjusted to STP? Assume the amount of gas is held constant.

2007-02-23 12:04:04 · 2 answers · asked by Anonymous

2007-02-23 12:02:17 · 5 answers · asked by Gideon 1

Why are some spectral lines brighter then other lines?

2007-02-23 11:53:46 · 4 answers · asked by nickcasey829 1

We did a lab and we had to predict whether
1-butanol (primary) , 2-butanol (secondary), and 2-methyl-2-propanol (tertiary) undergo halogenation. We mixed those 3 alcohols with concentrated HCl (aq)...

How do you predict whether this goes under halogenation?
And what does cloudiness means if it occurs? Because the only one that cloudiness appeared was for the tertiary alcohol mixed with the HCl (aq)

Thank you =)

2007-02-23 11:39:47 · 5 answers · asked by A 2