Chemistry - December 2007

As defined by Ludwig Boltzmann, the third law of thermodynamics states that

a.in a spontaneous process, the entropy of the universe increases.
b.the total entropy of the universe is always increasing.
c.there is no disorder in a perfect crystal at 0 K.
d.mass and energy are conserved in all chemical reactions.
e.the total energy of the universe is constant.

2007-12-07 05:36:42 · 2 answers · asked by Anonymous

A. form numerous radioactive fission products.
B. do not pollute the air with SO2, soot, and fly-ash.
C. produce more thermal pollution than coal plants.
D. use more fuel.

2007-12-07 04:04:30 · 1 answers · asked by Anonymous

2007-12-07 02:49:30 · 2 answers · asked by Anonymous

2007-12-07 02:35:09 · 9 answers · asked by tom the plumber 3

2007-12-07 02:09:46 · 8 answers · asked by chsswimmer9393 1

is it because the coke is more reactive than the iron ore and limestone that is also used in the limestone.?

2007-12-06 23:47:20 · 2 answers · asked by Anonymous

I have a hard time understanding how to start and solve this problem....

Q: Write the nuclear reaction equations for the neutron-induced fission of U-235 to form Xe-144 and Sr-90. How many neutrons are formed in the reaction?

2007-12-06 20:48:46 · 5 answers · asked by ecstyle483 1

Q.1 Do bases have H+ ions?if yes,then why are they called bases?

Q.2Which of the following,vanilla,olive and clove can be used as olfactory indicators?

2007-12-06 20:47:20 · 2 answers · asked by lost... 5

2007-12-06 20:34:18 · 2 answers · asked by Elizabeth 2

2 Fe(s) + 3 Cl2(g) 2 FeCl3(s)

Calculate the mass of FeCl3 that is formed if 12.10 g of iron reacts.
i tried it many times, i got 12.10g but that is not the answer.

2007-12-06 19:51:31 · 2 answers · asked by Endiscapable duka ras 1

The solubility of PVAOH in other chemicals except water, it may be in any organic and inorganic compound. plz answer

2007-12-06 18:21:11 · 1 answers · asked by basit k 1

Same question with sodium methoxide. Please explain your answers. Thanks.

2007-12-06 17:51:02 · 2 answers · asked by James 1

a. sp
b. sp2
c. sp3
d. sp3d
e.sp3d2

2007-12-06 17:46:50 · 2 answers · asked by Anonymous

2007-12-06 17:43:44 · 2 answers · asked by phoebe 1

2007-12-06 17:40:18 · 1 answers · asked by Jashan M 1

How do you solve a molecular formula? Can someone describe how to do it and do the first problem for me while explaining the steps as you go along?
Thanks.

A compund has the following percentage composition: 26.7% Carbon: 2.2% hydrogen; 71.1% oxygen. The molecular weight of this compound is 90. What is the compound's true formula?

2007-12-06 17:35:42 · 2 answers · asked by Marah 5

The question is, "A student left some alkyl halides (RCl and RBr) in an open container for several minutes. What happened to the composition of the halide mixture during that time?" Not quite sure how to figure this one out...any help will be greatly appreciated!

2007-12-06 16:57:34 · 1 answers · asked by Heather Leigh 1

thanks.

2007-12-06 16:49:08 · 2 answers · asked by lisazhang112004 1

i am trying to make a 3%
-salt / NaCl
-sugar/ C6H12O6
-asprin/acetylsalicylic acid / C9H8O4
with 500 mL of each water.

How would i make it? would i use 3% of 500 ml (15 grams) of each solute and dissolve it into water?
if not, how much solute would i need and how would i do it?
i'm doing this for a science fair w/ a partner, and the teacher didn't really help us much...so help please!

2007-12-06 16:32:56 · 2 answers · asked by Anonymous

i know it's hard to draw dots and such on the computer so can anyone at least just explain how you determine where to place dots, and how you determine when something requires a double or triple bond, i haven't gotten too far into learning about lewis dots so it's just the basics i need to figure out.

this is all i know in general:

-carbon is always the central atom
-all halides are single bonded with other atoms & found on outside of central atom
-nitrogen is most likely to form a triple bond with other elements
-oxygen form a double or single bond
-all elements, except hydrogen, need to fill 8 electrons

man...you have no idea how helpful it'd be if anyone could explain any other facts to make a lewis dot diagram.

2007-12-06 14:25:18 · 3 answers · asked by E 2

For sulfur, the fluorides SF2, SF4, and AF6 are known to exist, whereas for oxygen only OF2 is known to exist. Why?

2007-12-06 13:12:57 · 1 answers · asked by ny_spinner_dan 3

Is it a different molecular arrangement? Does that mean you can convert Ethanol to Ethyl Alcohol?

2007-12-06 13:10:27 · 10 answers · asked by Anonymous

please need help on this!

2007-12-06 13:08:40 · 3 answers · asked by Markoso 1

Molarity!??!?!? help is greatly appeciated!!!!! thanks

2007-12-06 13:06:08 · 1 answers · asked by Anonymous

2007-12-06 12:59:48 · 2 answers · asked by menicholson1 1

A common misconception is that molecules of solids are harder than molecules of liquids. Explain why this is false.
Please help me..

2007-12-06 12:50:14 · 1 answers · asked by Anonymous

I am supposed to take the formation of methanol from carbon monoxide and hydrogen gas:
CO(g) + 2H2(g) => CH3OH(l)
and then I am supposed to find how much heat is released when 15.0 L of CO(g) at 358.15 K and 1.11 atm react with 18.5 L of hydrogen gas at 348.15 K and 0.90 atm? I have to express your answer in kJ. There is a (Hint: The heat released refers to the absolute energy released into the surroundings. This is a positive number when the reaction is exothermic). Any ideas on how to do this? I am so confused!

2007-12-06 12:10:47 · 1 answers · asked by David R 1

2007-12-06 09:01:12 · 12 answers · asked by Anonymous

2007-12-06 08:59:03 · 3 answers · asked by Anonymous

a) The shape and function of a protein is determined only by the different types of amino acids that make up the chain.
The order they appear in is not a factor

b) The sequence of amino acids that make up a protein are known as the primary structure of the protein

c) Although proteins are long and complex, they have a regular structure that results from hydrogen bondng

d) The tertiary structure of a single protein molecule is created by hydrogen bonds between an amine group and a lone pair of electrons on an oxygen molecule

e) One type of secondary structure found in proteins is α-helix

f) The structrure of a protein that results from only hydrogen bonding between the side chains of the different amino acids is called the tertiary structure


I have tried everything and nothing seems to be working : (

2007-12-06 07:59:28 · 4 answers · asked by Liv 2