Science & Mathematics - 9 January 2007

what are some good model rockets to buy under $100

i have alot i want some more but i want cool ones

any skill level or engine type

2007-01-09 08:52:36 · 2 answers · asked by cool man 2 in Astronomy & Space

i have tried everything but do not know the answers. i would really appreciate help.

Identify which type of reaction each of the following represents: (2 points each)

2H2SO4 + 4 KOH ---> 2 K2SO4 + 4H2O ________________________

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) _____________________

2Li(s) + Br2(l) --> 2 LiBr(s) ______________________________

2H2O(l) --> 2H2(g) + O2(g) _______________________

Finish the following reactions and balance the equations. (4 points. each)
(Use the Helps and Hints file for help completing the reactions. Go through it step by step and let your instructor know if you have any questions.)

NaOH(aq) + Fe(NO3)3(aq) -->

NH3 -->

H2 + O2 -->

Mg + H2SO4 -->

thanks a lot.

2007-01-09 08:51:01 · 1 answers · asked by Anonymous in Chemistry

a pre-algebra problem:
How is it possible for 11 + 2 to equal 1?

2007-01-09 08:51:00 · 16 answers · asked by Tiya_b(a)na(n)as[z] 2 in Mathematics

please show the steps you took to simplify this expression

2007-01-09 08:48:06 · 3 answers · asked by tonda_pooh_2004 1 in Mathematics

A snail,which I had carefully deposited over the garden wall ,was determined to get back in. Each hour it climbed 1 foot, but then it fell asleep and slipped back 6 inches, If the wall was 6 feet high, how many hours will it take the snail to reach the top?

2007-01-09 08:48:04 · 9 answers · asked by Anonymous in Mathematics

2007-01-09 08:45:47 · 4 answers · asked by **~~;BaByBoo~~** 1 in Physics

These are scores of bowlers.

2007-01-09 08:45:19 · 11 answers · asked by Anonymous in Mathematics

Although viruses are not made up of living cells, could they still be considered alive since that is only one "characteristic" of life? Or are they dead?

2007-01-09 08:45:12 · 9 answers · asked by Mz. Beautiful 1 in Biology

i've been trying and trying to figure this out for 2 days! can someone give me an indirect proof?

2007-01-09 08:44:48 · 3 answers · asked by the common cold 4 in Mathematics

1)if log3 a = log(1/3)b, find log(ab)

2) log√3 5 = loga25, a=?

2007-01-09 08:44:04 · 3 answers · asked by nrs_srn0001 1 in Mathematics

unit of measurement used of the first balance?

2007-01-09 08:43:55 · 10 answers · asked by Anonymous in Chemistry

C (s) + SO2 (g) ---> CS2(g) + CO(g)

How many liters of SO2 are required to make 152 grams of CS2?

2007-01-09 08:43:10 · 2 answers · asked by Anonymous in Chemistry

I really want people to think about the question. Scientist are barely proving that Mars has water and single cell organisms which prove life. So if so why is hard to think that life exist outside our solar system...

2007-01-09 08:42:47 · 6 answers · asked by DZ 5 in Astronomy & Space

I want to know why the variance of X-Y is equal to the variance of X+Y. And A source would be really helpful Thanx!

2007-01-09 08:40:44 · 0 answers · asked by Da MC 2 in Mathematics

First of all,, I am against cloning....
well I don't think this matters with the question I am asking now;

I need to answer this question but... I have no idea what it is asking about... can someone help me?


The question:
If multiple animals of a species are resurrected from only one specimen, what will this mean for genetic diversity and survival of the resurrected species?

2007-01-09 08:39:36 · 4 answers · asked by melong_91 1 in Biology

153 feet/min = mi/hour


216 ounces= _________ pints


27 cm/day= __________ m/ week

2007-01-09 08:38:22 · 6 answers · asked by steve_scharein 2 in Mathematics

equation: tan^2 θ = 3/5sec θ

use the trig identity...
sec^2 θ - 1 = 3/5sec θ

set the equation to 0...
sec^2 θ -1 - 3/5sec θ = 0

what should my next step be? thanks for the help.

2007-01-09 08:33:42 · 3 answers · asked by shih rips 6 in Mathematics

2007-01-09 08:30:17 · 12 answers · asked by Alexus G 1 in Biology

2007-01-09 08:29:15 · 1 answers · asked by Anonymous in Biology

2007-01-09 08:29:13 · 6 answers · asked by Anonymous in Geography

How to preserved fruits and vegetables?- I need to know for my science project.

2007-01-09 08:25:51 · 3 answers · asked by esma_susuz 1 in Botany

2007-01-09 08:24:50 · 2 answers · asked by sunshyn 1 in Medicine

my daughter is doing a science project, it involves a shallow saucer of water with a candle in the middle of it , then you put a mason jar over top of candle...fire goes out due to lack of oxygen,right....then the water in the saucer is vacuumed up into the jar.....please tell me what this process is called...and if you have any ideas what to title this project...i need good advice - thank you...

2007-01-09 08:24:29 · 6 answers · asked by beachnut222000 4 in Chemistry

2007-01-09 08:24:24 · 11 answers · asked by prdncanders 1 in Mathematics

I have to make a phamplet. So I want to ask what drug makes cough medication high? And how does it affect the body?

No offence but I think kids these days are getting stupider. Seriously.

2007-01-09 08:24:06 · 7 answers · asked by lorrnae 3 in Medicine

2007-01-09 08:23:28 · 1 answers · asked by Anonymous in Geography

Ok This is the problem but I don't dnow how to do it or what the answer is:
The PTA held a bake sale during the intermission. Sixteen out of 24 brownies were sold and 10 out of 12 cupcakes were sold. How does the fraction of cupcakes sold compare with the fraction of brownies sold?


Thank you soo much and please help.

2007-01-09 08:22:23 · 5 answers · asked by ? 3 in Mathematics

3/7 divided by 5/7, the answer is 10 2/5 but I need to know how to work this out.

2007-01-09 08:22:11 · 6 answers · asked by crzybabi 4 in Mathematics

2007-01-09 08:20:02 · 2 answers · asked by Hrag H 1 in Geography

Steven and Deborah have six daughters, Each of the daughters had a brother, If it costs Deborah £15 a week to feed each child,£15 a week to feed herself, and £18 a week to feed steven, What is her weekly shopping bill?

2007-01-09 08:20:01 · 12 answers · asked by Anonymous in Mathematics