Homework Help - August 2006

20. In a lab experiment, we compare the rates of reactions between oxygen and a substance,
S, that oxidizes at room temperature. In Experiment 1, we expose 5 grams of S to the air.
In Experiment 2, we expose 5 grams of S to the air, but this time, S is ground into a powder.
What can we expect to observe, and why?
A. There will be no change in the reaction rates.
B. The reaction rate for Experiment 2 will be much slower due to increased surface area.
C. The reaction rate for Experiment 2 will be much faster due to increased surface area.
D. The reaction rate for Experiment 1 will be much faster due to concentration of reactants.

2006-08-27 12:19:21 · 5 answers · asked by terry b 2

2. In describing an equilibrium reaction involving hydrogen gas, iodine gas, and hydrogen
iodide gas, all of the statements about equation Q= [HI]2 [H2] [I2] are true exceptfor
which one?
A. Any solids are omitted from equilibrium expressions.
B. The brackets refer to “concentration of . . . ”
C. Coefficients from the original balanced equation (in this case, 2 HI) become exponents.
D. The products go to the denominator, and the reactants go to the numerator.
3. If the angle of collision between molecules A and B in a reaction is favorable, reaction
energy is less than when the angle of collision is unfavorable. If you look up the typical
activation energy for a given reaction in a table, the value you see will be for
A. minimum activation energy.
B. maximum activation energy.
C. average activation energy.
D. the range of values between minimum and maximum activation energy.
4. If a catalyst is used to alter the reaction rate of A + B → AB, we can expect a/an
A. increase in ∆ H.
B. increase in the activation energy that initiates the reaction.
C. decrease in ∆ H.
D. decrease in the activation energy that initiates the reaction.
5. Regarding solutions and solids, which statement is true?
A. If the solvent is water, the crystal lattice energy of a solid is absorbed.
B. Hydration energy is related to the attractions between solute particles.
C. If the solvent is water, the crystal lattice energy of a solid is released.
D. Hydration energy is related to the attractions between solvent particles.
6. Avogadro’s number gives us the number of
A. atoms in any element or compound.
B. particles in a mole of any element or compound.
C. atoms in an element.
D. particles in a sample.
7. A chemical formula containing the simplest whole-number ratio between elements in a
compound is called the _______ formula.
A. derivative C. composition ratio
B. composition D. empirical

2006-08-27 12:15:29 · 2 answers · asked by terry b 2

Gloria's favorite colors are pink and yellow. She has sox in those colors, of course, but she really likes gloves!
In her glove drawer, there are six pairs of pink gloves, and six pairs of yellow gloves, but the gloves are all mixed up. In complete darkness, how many gloves does Gloria have to take from the drawer in order to be sure she gets one pair? She doesn't mind whether it is a pink or yellow pair.

2006-08-27 12:06:55 · 5 answers · asked by Alley 1

2006-08-27 12:05:54 · 3 answers · asked by bahiaferrah 1

2006-08-27 12:05:00 · 2 answers · asked by angelfan_007 1

I'd hate to be one of those people who as the stupid questions like what this this book about? becuase we have sparknotes for that, buyt what sparknotes and all the other websites DO NOT have, is the subplot. The subplot is an under-story that runs parallel to the main plot. As a hint, if your choice of main plot is an internal conflict, then your subplot may be external. If the main plot is specific to a small group of people, then the subplot may be a wider cross section of the population. THis would lead me to believe that it was about the french and indian war... but how can i write a page on it? Can someone provide some assistance to me ASAP? I read the entire book, and have a ten page paper to write due tomorrow morning... Also, any quotations (not from sparknotes or anywhere else) would be helpful, becuase those quotes arent working for me, and the whole world would know i went to sparknotes... Thank you whoever you are if you help me...I wont forget this!! Thanks a bunch!!!

2006-08-27 11:58:59 · 4 answers · asked by heartbreaker2377 3

2006-08-27 11:48:24 · 3 answers · asked by Anonymous

2006-08-27 11:43:10 · 14 answers · asked by Anonymous

im moving onto algebra 2 ..and i have to do this summer review packet....but i dont remember how to do some of the problems....so I need help...and we have to show all of our work!!!!! so any site on how to do a problem ...factoring ...simplifing.....any site on rules of algeba and anything would HELp!!!!!!!

2006-08-27 11:21:57 · 5 answers · asked by Riz 2

A can of orange juice concentrate holds 12 oz. If you mix it with three cans of water , how big of a pitcher do you need to hold it all.

2006-08-27 11:04:15 · 7 answers · asked by Anonymous

256,16,4,2__ I can't find the pattern?

Next is one about conjecture-an unproven statement that is based on observations.

i need to come up with a conjecture based on the pattern below.
but i know their the same as the number begining times but how do i make a conjectue out of it?

101 times 34= 3434
101 times 25= 2525
101 times 97= 9797
101 times 49= 4949

2006-08-27 11:01:46 · 6 answers · asked by Sakura 1

2006-08-27 10:56:00 · 2 answers · asked by Anonymous

I'm really nervous that I won't have enough time to finish homework, and I am a freshman.

2006-08-27 10:53:57 · 10 answers · asked by On the Journey 2

2006-08-27 10:53:22 · 2 answers · asked by Anonymous

I have this chemistry problem that I have been trying to answer since last week, but still I can't figure it out. Please help!

Petroleum based fuels like gasoline consist mainly of hydrocarbons, compounds containing only hydrogen and carbon. One of the compounds in gasoline is isooctane, C8H18. When burned in a car's engine, some isooctane conbusts completely to form carbon dioxide and water, as shown in equation (1), and some combusts incompletely to form carbon monoxide and water, as shown in equation (2).

(1) 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O

(2) 2 C8H18 + 17 O2 --> 16 CO + 18 H2O

If 50.0 g of isooctane burns to produce 221.2 g of total gaseous products ( a mixture of CO2, CO, and H2O), determine the percent by mass of isooctane that reacts by complete combustion.

2006-08-27 10:52:06 · 1 answers · asked by ? 3

go dogs , go dogs , go go go is the cheer for the bulldogs basket ball team. If 15 cheerleaders yell the cheer 5 times how many times is go said?

2006-08-27 10:51:52 · 30 answers · asked by Anonymous

2006-08-27 10:51:06 · 3 answers · asked by Trae F 1

like for B- books,and bus

2006-08-27 10:45:12 · 10 answers · asked by Anonymous

I have missed a couple of days at school and I have a work sheet on prepositions. Can there be more than one object in a sentence, example: "The train roared through the tunnel, blasting its horn."? Could the objects be train, tunnel, and horn? Thanks for the help

2006-08-27 10:42:21 · 7 answers · asked by Anonymous

Thanks for ya'll help

2006-08-27 10:39:46 · 9 answers · asked by Sexy Capri' 2

My english teacher has asked my class to write a paper without the words is, are, was, or were in it. I have no idea about how to do this. Some one please help!!!

2006-08-27 10:37:17 · 9 answers · asked by Anonymous

2006-08-27 10:37:07 · 2 answers · asked by val88 3

whats the difference?

2006-08-27 10:36:15 · 2 answers · asked by Anonymous

I'll do your english homework for cash.

If you're in the grades 6-10 that is.

If you've got to write a portfolio piece (editorial, short story, transactive piece, etc.) or a poem or any other piece of writing that doesn't require me having a textbook, i'll do it for only $5-$10.

Give me as much time ahead as you can though! I'll send it through email when I'm done. And you can send the cash by mail. (i'm hoping you won't rip me off, eh?)

Yea, I love writing. and i figure i can make a few bucks off of it.

contact me at fistfulofsand@gmail.com if you want my help.

2006-08-27 10:29:28 · 4 answers · asked by N/A 3

2006-08-27 10:26:46 · 3 answers · asked by val88 3

2006-08-27 10:24:26 · 6 answers · asked by lyn_zie2003 1

2006-08-27 10:23:31 · 2 answers · asked by lyn_zie2003 1

2006-08-27 10:22:37 · 1 answers · asked by lyn_zie2003 1

A: true
B: false

2006-08-27 10:20:11 · 6 answers · asked by dylan_johnson27 1

2006-08-27 10:20:06 · 2 answers · asked by lyn_zie2003 1