Wednesday

February 10, 2016
Total # Posts: 259

**organic chemistry**

urgent, please help me...this is about the separation and purification scheme... there is 4 group of mixture: a)benzoic acid, benzoin and 1,4-dibromobenzene b)fluorene, o-toluic acid and 1,4-dibromobenzene c)phenanthrene, methyl 4-aminobenzoate and 1,4-dibromobenzene d)4-...
*March 23, 2010*

**Chemistry**

A student performed the synthesis of aspirin using a water bath at 90C instead of 50C. The final product was tested for the presence of phenols with ferric chloride. This test was negative (no color observed); however, the melting point of the dry product was 122-125 C. ...
*March 20, 2010*

**Latin**

Can you translate the story below to Latin please? Khloe and Kaylani Khloe sees Kaylani. Khloe yells: Hey!! Kaylani turns around and yells: Yo!! Khloe runs to Kaylani. Kaylani reaches out for a hug. Kaylani and Khloe walk across the street. They’re going to a basketball ...
*March 1, 2010*

**Organic Chemistry**

Suppose you forget to add sodium carbonate to your tea solution prior to extraction. What effect would this have on your yield, and why?
*February 25, 2010*

**Physics**

use voltage potential for point charge v= K Q / r^2 V given, K known, Q ( 6* electron charge) , solve for r
*February 24, 2010*

**Chemistry**

But there is no water involved...
*February 22, 2010*

**math**

reggig has a shelf that is 17 inches long.he has a set of books and each is 2 and1/2 inches thick how many books can be placed on the shelf?
*February 17, 2010*

**math**

nadia wants to use ribbon for a frame she needs 2 piece that are 3 and 5/8inches long and 2 pieces that are 5 and 3/8 inches long how many inches of ribbon does she need?
*February 17, 2010*

**math**

on friday catlin ran 1 and 1/5 miles on sunday she ran 1 and2/5 miles.On the same two days her friend lee ran a total of 3 miles.How much father than catlin did lee ran?
*February 17, 2010*

**math**

adria bought 2pounds of jelly bean she gave 2/3 of a pound to her cousin and 2/3 to her cousin .how many pounds of bean does adria have left?
*February 17, 2010*

**IS this right????????**

OK last time, do I add up P(x) values from the binomial table from 3 through 12 to establish p and then subtract p value from 1 (as I would to get q value) to get answer C)? or would I totally switch the p value from women to men. I would like to keep the integrity of the ...
*January 24, 2010*

**Statistics**

Anyone? Really need help on how to do this please :)
*January 24, 2010*

**Statistics**

PS I don't want the answer, for C, I just need to understand how to do the formula. Anyone?
*January 24, 2010*

**Statistics**

70% of the student body of a very large post-scondary institution is female. In a random sample of 12 students, what is the probability that: a) at most half will be females b) more than 7 will be females c) fewer than 3 will be males I used the Table of Binomial Probabilities...
*January 24, 2010*

**Chemistry**

An unknown was prepared with the concentration of 0.0000890 M. A Beer's Law plot was prepared using the absorbance values from standard solutions of ASA and a line drawn through all the points passed through the origin with a slope of 1750.0 M–1. The expected ...
*January 23, 2010*

**Stats**

Is this right for A) n=6 p=P(.38) q= 1-.38=.62 q=P(.62) P(x=0)= 6C0= 6!/ 0!(6-0)!= 6!/0!(6)!= 6*5*4*3*2*1/1*6*5*4*3*2*1= 720/720= 1 6C0 (.38)0 (.62)6= (1)(1)(.0568)= .0568 so P(x=0)= .0568?
*January 23, 2010*

**Stats**

Studies show that 38% of all women suffer from hip fractures caused by osteoporosis by age 85. If 6 women aged 85 are randomly selected, what is the probability that A) None will suffer or has suffered a hip fracture P(x = 0) B) At least 4 have suffered a hip fracture P(x &...
*January 23, 2010*

**chem**

The 4 atoms.unit cell is where I got confused. How do you know that? And how does it change for hexagonal close pack and body centered cubic?
*January 20, 2010*

**chem**

An element has ccp packing with a face-centered cubic unit cell. Its density is 1540 kg/m3 and the unit cell volume is 1.73 x 10-22 cm3. Calculate the molar mass (g/mol) of the element to three significant figures. CCP: cubic close pack
*January 20, 2010*

**chemistry**

The hydrogen emission spectrum has four series (or sets) of lines named Balmer, Brackett, Paschen, and Lyman. Indicate the energy (infrared, ultraviolet, or visible), the nf value for each series, and all possible ni values up to 7. ( Separate the values with commas from ...
*January 14, 2010*

**chem**

The hydrogen emission spectrum has four series (or sets) of lines named Balmer, Brackett, Paschen, and Lyman. Indicate the energy (infrared, ultraviolet, or visible), the nf value for each series, and all possible ni values up to 7. ( Separate the values with commas from ...
*January 14, 2010*

**algebra 1**

I'm really struggling with word problems. I don't know how to set this up. 2. You own a piece of land on which you owe the bank $12,760 to the bank. You decide to sell the land and want enough money to pay off the mortgage of the land. The real estate agent gets 6% of ...
*January 13, 2010*

**math**

if i forgot the product of 9 and 9 what can i do to figure it out
*January 11, 2010*

**Math**

Each person would get 8 pieces of land.
*December 8, 2009*

**Math**

-If you take 24 divided by three it would equal up to eight. -Then if you multiply eight times three it would equal up to 24. -Finally if you take 8 and put it on top of 24 it would make a fraction.
*December 8, 2009*

**Algebra 2**

A blue print of a shopping complex shows that the bottom edge of the roof to be 93 feet above the ground. If the roof rises to a point 171 feet above the ground over a horizontal distance of 6.5 yards, what is the slope of the roof? I am positive the answer is twelve, but the ...
*October 14, 2009*

**Algebra 1**

2y/5+5=9 Please solve this problem and show your steps, (like a t-chart.) Thank You!!! :)
*October 11, 2009*

**geometry**

48
*September 26, 2009*

**Science**

HI, i want to make Working models on these subjects. 1. Climate Change 2. Green Energy 3. Biology Human welware 4. Information and communication technology 5. Mathmatics in everyday life 6. Science and technology in games and sports 7. middle Sciece Please Suggest me what ...
*August 17, 2009*

**Physics**

Global Positioning System (GPS) satellites circle Earth at altitudes of approximately 20000 , where the gravitational acceleration has 5.8% of its surface value.
*August 10, 2009*

**maths**

prove that cos3x+sin3x/cos x-sin x=1+2sin2x
*July 22, 2009*

**english/history**

intead of was it should be were because it is supporters
*April 1, 2009*

**english/history**

yes this make sense
*April 1, 2009*

**Social Studies**

tell me a website from where i can get serial and keygen of softwares
*April 1, 2009*

**Science**

Tell me a website from where i can get serial and keygen of softwares.
*April 1, 2009*

**Algebra 2**

1/x+12=3x/3x^2+36
*January 22, 2009*

**10th grade**

ok
*January 22, 2009*

**TO ALL STUDENTS**

ok
*January 18, 2009*

**Science**

If you were flying directly south from the north pole and reached 70 degrees north latitude, how many more degrees of latitude would be left to pass over before you reached the south pole?
*December 31, 2008*

**science**

thank you very much, that really helps!
*September 13, 2008*

**science**

thank you! :)
*September 13, 2008*

**science**

thanks!
*September 13, 2008*

**science**

could someone please tellme what the orce of gravity acting upong me by Mars, Jupiter, and the moon are? I've been trying to find their gravity online, but I can't find it anywhere.
*September 13, 2008*

**Introduction to Business**

What is intreport?
*August 18, 2008*

**Maths - check answer**

On the May 1 billing date, Mary had a balance due of $970.60 on her credit card. The transactions during the following month were: May 5 Payment $400.00 May 10 Charge: airline tickets $381.00 May 22 Charge: hotel $270.60 May 25 Charge: florist $60.20 The interest rate on the ...
*March 11, 2008*

**Maths**

Can Please someone check if i did this right 970.60*4 = 3882.4 970.60-400 = 570.60 * 5 =2853 570.6+381 = 951.6*12 = 11419.2 951.6+270.6=1222.20*3 = 3666.6 1222.2+60.2 = 1282.40*7 = 8976.80 total AVD = 30798/31 = 993.48 Finance charge = 993.48*0.012 = 11.92
*March 11, 2008*

**Maths**

On the May 1 billing date, Mary had a balance due of $970.60 on her credit card. The transactions during the following month were: May 5 Payment $400.00 May 10 Charge: airline tickets $381.00 May 22 Charge: hotel $270.60 May 25 Charge: florist $60.20 The interest rate on the ...
*March 11, 2008*

**Math - Credits & finance charges**

Can Please Someone help me with this Thanks
*March 10, 2008*

**Math - Credits & finance charges**

On the May 1 billing date, Mary had a balance due of $970.60 on her credit card. The transactions during the following month were: May 5 Payment $400.00 May 10 Charge: airline tickets $381.00 May 22 Charge: hotel $270.60 May 25 Charge: florist $60.20 The interest rate on the ...
*March 10, 2008*

**Math - Credits & finance charges**

On the May 1 billing date, Mary had a balance due of $970.60 on her credit card. The transactions during the following month were: May 5 Payment $400.00 May 10 Charge: airline tickets $381.00 May 22 Charge: hotel $270.60 May 25 Charge: florist $60.20 The interest rate on the ...
*March 10, 2008*

**grammar..adjective and adverbs..PleaseRespondASAP**

is ten nad adjective or an adverb
*January 30, 2008*

**algebra**

simplify y^3-64 / y-4
*September 8, 2007*

**algebra**

2/x^2+2x+3/x+1/x+2
*September 8, 2007*

**algebra**

simplify 5- 1/x-4
*September 8, 2007*

**algebra**

divide 5/x+4 / 30/6x+24
*September 8, 2007*

**algebra**

fin set of values 3x/x+2
*September 8, 2007*

**algebra**

simplify 7-t/t^2+1 - t-2/t^2+1
*September 8, 2007*

**Astronomy**

A cinder block can be weightless in space. Would you want to kick it with your bare foot? Even If it is weightless, does it have mass? An astronaut, circling the earth in the Space Shuttle, senses that his apparent weight is zero. He cannot feel the normal earthbound sensation...
*April 10, 2007*

**Earth**

1. If the Earth were the size of B-B (with a radius of about 0.2 centimete), how big would the Sun be? How big would the Milky Way be? 2. Imagine building a model of the Solar System on your campus. Work out the diameter and spacings of the planets in millimeters and meters ...
*April 3, 2007*