Science & Mathematics - 19 December 2007

In chemistry, we are give a word equation (for example, lead(ii)oxide + water), and we then have to complete it and balance it in a chemical equation. How do I complete it? We also have to indicate the state of each reactant and product, which I can do. Here are some of the problems (but I really just want to know how to do it):

Aluminum + ferric chloride solution
Sodium sulfide solution + barium chloride solution
Carbon dioxide gas + sodium hydroxide solution
Magnesium nitric acid

I think I know how to start it (for example, with lead (ii)oxide + water, it becomes PbO+H2O-> XXX (I don't know what the XXX would be)), but I cannot find what type of reaction occures, and what the final product is.

2007-12-19 10:36:19 · 1 answers · asked by Alex K 2 in Chemistry

A. Splicing the RNA transcript in more than one way

B.Transcription of different protein molecules

C.Alteration of the promoter region

D.Inactivation of the RNA polymerase

E.Synthesis of multi-transcript units of RNA

2007-12-19 10:35:15 · 1 answers · asked by stevie 1 in Botany

2007-12-19 10:34:53 · 6 answers · asked by Anonymous in Weather

55. Propane (C3H8) is a gas used for cooking and heating. How many molecules are in 6.12 moles of propane?

How do you do this?

thanks

2007-12-19 10:34:49 · 2 answers · asked by sheparddancr1217 2 in Chemistry

How I can made Excel Sheet Answer this equation mathematics ....
H(λ)= a0+a1(λ) +a2(λ)^2+a3(λ)^3
H(λ) =2.00 λ = 0.25
H(λ) =2.07 λ = 0.20
H(λ) =2.18 λ = 0.14
H(λ) =2.23 λ = 0.12
thanks for help

2007-12-19 10:34:37 · 3 answers · asked by muslim_heart_4ever 1 in Engineering

Please Help me solve this equation. Im thinking double angles are used.

2007-12-19 10:33:52 · 4 answers · asked by Abel T 2 in Mathematics

How do you do this...

53.) Calculate the average atomic weight for magnesium.

**Then they gave me a table/chart** it says:

mass # exact weight % abundance
24 23.985042 78.99%
25 24.985837 10.00%
26 25.982593 11.01%

2007-12-19 10:33:15 · 1 answers · asked by sheparddancr1217 2 in Chemistry

2007-12-19 10:32:50 · 13 answers · asked by laborforce3866 1 in Astronomy & Space

it is for schoool

2007-12-19 10:31:47 · 19 answers · asked by Anonymous in Zoology

A neutral atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons and electrons.

2007-12-19 10:26:08 · 7 answers · asked by Testhaha 1 in Chemistry

is it just pv=nrt

2007-12-19 10:26:02 · 3 answers · asked by king of soccer 1 in Chemistry

HI Im reasearching on the orb spider can any one give me any help

2007-12-19 10:25:01 · 2 answers · asked by larrypingwang 1 in Zoology

The Reaction is as follows:

CaI2(aq)+ K2C2O4(aq) --> CaC2O4(s) + 2KI(aq)

a.) If you had .05 moles of each reactant, how many moles of each product could you make?

b.) If you had 10.0 grams of calcium iodide, how many grams of calcium oxalate could you potentiallly make?

c.) How many grams of potassium iodide could you make with 10.0 grams of calcium iodide?

2007-12-19 10:24:58 · 3 answers · asked by Anonymous in Chemistry

2007-12-19 10:23:49 · 2 answers · asked by danasha 1 in Chemistry

My cousin needs help with her homework....she is in 7th grade and she is doing genotype and punnett squares and stupid stuff like that...this is due tomorrow and it is a big grade..please please help!!!!

2007-12-19 10:22:21 · 12 answers · asked by Anonymous in Botany

2007-12-19 10:22:06 · 5 answers · asked by Anonymous in Weather

2007-12-19 10:20:49 · 1 answers · asked by danasha 1 in Chemistry

Ok Question:
Clue 1) When divided by 4 you get a remainder of 4.
Clue 2) My number has 2 digits and both numbers are even.
Clue 3) The sum of the digits is 10

What number am I?

2007-12-19 10:20:00 · 13 answers · asked by angeldaimon15 1 in Mathematics

this is for anatomy class. I thought all worms ate soil. Please help

2007-12-19 10:19:28 · 5 answers · asked by smarty 2 in Zoology

2007-12-19 10:19:08 · 10 answers · asked by Anonymous in Parapsychology

There are several problems here if you can help me with any of them it is greatly appreciated!!
1) in 1980 the average price of a home in buckeye county was 90 000$. By 1986 the average price of a home was 114 000$. Which of the following represents the price of a home,P, in buckeye country in terms of the year,t? let t=0 correspond to 1980.
The answer is P=4000t +90,000 <-How do i get that answer

2)The intensity ,I, of light received from a source varies inversely as the square of the distance, d, from the source. If the light intensity is 2 foot candles at 11 feet, find the light intensity at 19 feet (round answer to nearest 100th)
The Answer is .67<-How do i get that?

3)find the dimensions of a rectangle whose perimeter is 30 feet and whose area is 56 square feet.
The answer is: 8ft. by 7ft <-how do i get this?

2007-12-19 10:19:02 · 3 answers · asked by cutie123 3 in Mathematics

helpp plzzzz..

2007-12-19 10:18:41 · 3 answers · asked by Anonymous in Earth Sciences & Geology

H2 gas is produced from the single displacement reaction of magnesium with 6M HCl, with the HCl in excess. If we with to produce 42 ml of H2, how much magnesium is needed?

2007-12-19 10:17:42 · 1 answers · asked by kim 1 in Chemistry

Describe how clouds form from water vapor.Include the terms "dew point" and either "condensation: or :condense" in your answer..

pLzzzzz help meeee ...!!!!!

2007-12-19 10:15:09 · 2 answers · asked by Anonymous in Weather

Factor. Then check by multiplying the factors. If the polynomial is not factorable, then choose "prime" as your answer.
( ^ = to the power of )

w^2 + 20wm + 96m^2

it can be

(w + 8m)(w + 12m)
or
(w + 4m)(w + 24m)
or
(w + 6m)(w + 16m)
or
prime

2007-12-19 10:13:52 · 7 answers · asked by Jen C 1 in Mathematics

I think I would want to be a pumar.

2007-12-19 10:13:47 · 37 answers · asked by Anonymous in Zoology

I have a 50 gal reef tank whose pH is too low, about 8.0, I want the pH to go up to 8.3 - 8.4, and I have a safe additive to do that, but what is the equation to determine, based on the pH of the input solution, how much I would need, or what concentration of X volume of additive I'd need to raise the 55 + X gallons to 8.3 pH ? FYI I'm actually using this, I"m not a college flake trying to get someone else to do my homework for me :D

2007-12-19 10:13:11 · 1 answers · asked by Anonymous in Chemistry

yes or no...

2007-12-19 10:11:37 · 8 answers · asked by Anonymous in Weather

A. Low
B. High
C. Both
D. Air never flows counterclockwise in the southern hemisphere

2007-12-19 10:10:42 · 5 answers · asked by cinnamon tea 2 in Weather

What is the ratio of the periods of two identical pendulums oscillating on a planet X and on the Earth? (The acceleration of free fall on the planet X is 1.62 m/s2)

I have no idea...

2007-12-19 10:10:42 · 2 answers · asked by jabba 3 in Physics