Science & Mathematics - 11 February 2007

25.0 mL of 0.100 M NaOH requires 17.2 mL of a sulfuric acid solution to neutralize. What is the M of the sulfuric acid solution? (report answers in M)

2007-02-11 00:38:39 · 4 answers · asked by ? 2 in Chemistry

..sugar dissolves in water; and sugar crystals reform if you evaporate the water.

2007-02-11 00:38:22 · 2 answers · asked by NL 1 in Chemistry

some years ago I read from a local newspaper informing readers on the attempt of a Japanese team of scientists in finding innumerable digits of 'pi' by means of the then most advanced computer in a university. I'm sorry I can't recall it as well as the result. Do some people have some facts or reasons on the matter? Thanks.

2007-02-11 00:33:13 · 7 answers · asked by Arigato ne 5 in Mathematics

I want technology for digital reading on round surfaces for diameter measurements on boring heads used for machining applications.

2007-02-11 00:32:43 · 3 answers · asked by Anonymous in Engineering

PLEASE HELP!!! Not homework - just trying to understand HOW TO DO THIS... Formula.


What is the concentration of CH3OH in a solution prepared by dissolving 11.7 g CH3OH in sufficient water to give 217.0 mL of solution?


(do i add carbon, hydrogen, and oxygen together? then divide by 11.7 grams to get (# x 10^#??) If so, then what?)

2007-02-11 00:31:17 · 3 answers · asked by ? 2 in Chemistry

Only in industries.

2007-02-11 00:30:04 · 6 answers · asked by sj 2 in Earth Sciences & Geology

A piece of string 30 inches long has its two ends joined together and is stretched by 3 pegs so as to form a triangle. What is the largest triangular area that can be enclosed by the string?

Answer: 8(pi^0.5); I have already solved the problem assuming two sides to be equal; can some one please help me solve the problem without making that assumption - thanks

2007-02-11 00:28:33 · 4 answers · asked by sjj_14214 1 in Mathematics

Do a lot of my chemistry lectures online... teaching myself can be hard - please help...

You have an aqueous solution of each of the following two compounds. Write out the exact name of the precipitate that forms. If you decide that no precipitate would form, just type NR. (Do not capitalize the names of compounds and use a space before and after any needed roman numerals.)


Mix aqueous cobalt (II) sulfate and aqueous ammonium phosphate

2007-02-11 00:28:30 · 3 answers · asked by ? 2 in Chemistry

"To experiment, build 2 models, each consisting of a basin with an untreated seawater source, a 5# plastic
soda bottle tunnel perforated with a 9x9 matrix of 1mm-diameter holes on opposing sides of each soda
bottle segment, a condensation container, and tubes to allow effective flow of condensation out of the
systems. Place an electrode into each system and apply a 115-V power supply. Add a magnet stand to the
circumference of one model. The control model will lack a magnet stand and electrodes. Initiate
vaporization with a water heater placed into the untreated seawater source for ten days. Each day, measure
the temperature & observe the external conditions of the models. Analyze the CO2, salt concentration,
chloride content, resistance, & iron content of the untreated seawater before and then the final
condensation after the electromagnetic process"

Instead of seawater we'll be treating wastewater for bacteria.

2007-02-11 00:25:16 · 1 answers · asked by Anonymous in Chemistry

2007-02-11 00:21:55 · 2 answers · asked by dainty 1 in Zoology

what must girls do to attract boys towards them?

2007-02-11 00:21:23 · 4 answers · asked by Anonymous in Chemistry

i was told that labradorite was named after the Canadian Labrador because that is where it originated from, however i cannot find any source or data to confirm this.

2007-02-11 00:20:34 · 3 answers · asked by jeff hall 3 in Earth Sciences & Geology

2007-02-11 00:19:47 · 8 answers · asked by fabulous 1 in Chemistry

could anyone please help with the general integration of a function in the form of: (x^2)/(1-(x^2))^0.5

ie (x^2)/sqrt(1-(x^2))

2007-02-11 00:18:50 · 4 answers · asked by skp888 1 in Mathematics

A solution is prepared by mixing 0.0200 mol CH2Cl2 and 0.0300 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, respectively.

2007-02-11 00:18:35 · 1 answers · asked by Anonymous in Chemistry

I'm thinking about buying a used 10 meter transceiver and would like advice regarding which rigs to avoid and which rigs to look for. I'm particularly interesed in rigs that are capable of CW transmission. If they have CW reception filters, so much the better. Of course, if they have capabilites on other bands, thats acceptable. I'm asking for info on 10 meter only rigs because I assume rigs with restricted capabilities will be less expensive. 73

2007-02-11 00:17:43 · 1 answers · asked by cato___ 7 in Engineering

2007-02-11 00:11:31 · 8 answers · asked by Anonymous in Zoology

here is the link i cant find the answer.

http://elvis.engr.wisc.edu/uer/uer96/author9

2007-02-11 00:03:57 · 4 answers · asked by Anonymous in Biology