Wednesday
July 30, 2014

Posts by lolo


Total # Posts: 34

chemistry
What is the final temperature of 1370 g of water, originally at 20.9°C, if it absorbs 47.6 kJ of heat?

analytical chemistry
the problem is find the pH of a solution prepared by dissolving all of the following in sufficient water to yield 1.00 L of solution :0.180 mole of chloroacetic acid (CICH2CO2H),0.020 mole ofCICH2CO2Na,0.080 mole HNO3, and 0.080 mole Ca(OH)2. Assume that the Ca(OH)2 and HNO3 ...

analytical chemistry
a 0.120 ml portion of a 50.0% (w/w) KOH solution having a density of 1.50*10^3 g/l is diluted to 250 ml. What is the pH of the resulting solution?

math
6

math
what is 4 divided by 371

Physica
if an averge current of 5.5 Amp is passing through aconductor for 2 min . what is the charge in Coulomb ( C ) crosstional areaed any cross sec

life orientation
Smoking kills

Chemistry
ATP synthase, shown below, uses the proton (H ) gradient to drive ATP synthesis. Put the following steps of ATP synthesis in order from proton transport to the synthesis of ATP: a. The y subunit rotates and interacts with the three alpha beta subunit pairs, causing confrontati...

Chemistry
Oligonucleotides can be synthesized, one nucleotide at a time, by adding activated monomers to a growing chain. Place the steps of chemical DNA synthesis in the correct order. The first step is : 3' end of growing oligonucleotide attached to solid support. Then there is fo...

Chemistry
I am working on a problem like this one. I dont understand how you got to 51.4 from 30500 + (-20,907) = 51.4 kJ. Can you explain?

Algebra
You are choosing between two long distance telephone plans. One plan has a monthly fee of $15 with a charge of $.05 per minute. The other plans has a monthly fee of $5 with a charge of $.07 per minute. For how many minutes of long-distance calls with the cost for the two plans...

physics
Two waves are travelling on a string in the same direction. Both have a frequency of 101 Hz, a wavelength of 0.400 m, and an amplitude of 0.410 m. What is the amplitude of the resultant wave if the original waves differ in phase by π/4 rad?

Maths
A ladder, 6m long rests against a wall. The foot of the ladder is 2.5m away from the base of the wall. The ladder has a 'safe angle' with the ground between 60(degrees) and 70(degrees). what are the safe limits for the distance of the foot of the ladder to the wall.

chimie
formule de lewis du c2h7no

chemistry
1) to the nearest gram, what is the molar mass of Al2O3? 2)Br+H3O->HBr+H2O when this reaction is reversed what substance acts as an acid? what substance acts as a base ?

chemistry
still i can't understand it

chemistry
How long will it take for the 100mg of cesium-137 to decay to 6.25mg(1/16 the original amount)?

substance drug addiction
Can someone help me with the consequences of this human factor

math
what is 4 times 3

12th grade
on the "aster flower." What time of year might be symbolized by the aster flower and the other images of plant life found in the poem? How do these images contribute to the overall mood of the poem?

7th grade, math
5 more than 2 times a number

college chem
If your professor is strict about sig figs then the answer should be 55 atm.

math
78.75

math
what is the avarage of:89,84,63,79

Geometery
esto es un estupidez os piden respuestas y me poneis tereas no os basta con lo que tenemos idiotas de malagana para que abrir la web si alfin y alcabo somos mas listos que ustedes....................esto no acaba aqui,....................

health
Growth, maturation, and learning are all used interchangeably with the term

Chemistry
what is the theoretical value for the M of acetic acid in vinegar if the vinegar is 5% acetic acid by a % mass value. Additional info: the experimental M of the acetic acid in vinegar is 0.80M Thank you!!

stats
0.4909

homework
can u unscramble this aefinrtty

AP Physics
hi can u help me in my home work

statistics
Is there a significant difference between the average internet usage of persons aged less than or equal to 40 and those aged over 40? ( data i have is age and internet usage)

french
does anyone know any sites that can help me with my french homework. thankyou

Biology (( Plants ))
Hi I think how plants reproduce is a very complicated process and the structure of the plant ,, can anyone please give me a help and show me how plants reproduce cause my sats are coming and I'm in Grade 9 Thanks and I will be grateful to you You are right, it is complicat...

research
help me write an exposiyory math homework help me write an exposetory essay? http://www.geocities.com/fifth_grade_tpes/expository.html http://www.google.com/search?as_q=expository+writing&num=10&hl=en&btnG=Google+Search&as_epq=&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all...

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