Monday

February 20, 2017
Total # Posts: 66

**Chemistry**

PartA: What volume of 10.0M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? TrisHCl is a weak base and the molecular weight is 157.67 g/mol. I found the solution, it is 6.67 milliliters. Part B: "The buffer from Part A is diluted to 1.00 L. ...

*February 4, 2017*

**Biology**

In a population of Mendel's garden peas, the frequency of green-flowered plants (genotype aa) is 49%. The population is in Hardy-Weinberg equilibrium. What are the frequencies of the AA and Aa genotypes? I got 9% AA, 42% Aa as my answer, is this correct?

*October 3, 2016*

**Math**

How would I find the derivative of y=cotx with respect to x and also the answer should be in simplified form This is what I got: y= 1/tanx Y= cosx/sinx Idk what to do next

*December 15, 2015*

**organic chemistry**

Yes.. So alkadiene is much more volatile than alkene?

*September 6, 2015*

**organic chemistry**

Which has higher boiling point? A. Alkenes B. Alkadienes I think my answer would be A because it contains 1 double bond (1 pi bond)

*September 6, 2015*

**org chem**

Tca has greater acidity than acetic acid. Bcos of EAIE of 3 cl increases the positivity of carbonyl C making release of proton easier. Please explain. Why Cl increases positivity when Cl is infact an electronegative element

*August 17, 2015*

**org chem**

Pls answer

*August 16, 2015*

**org chem**

And also how would i know if the molecules or element in structure is either electrifilicity or nucleofilicity? For ex. Acetone. The carboxyl C is + and O is - but when you draw a canonical structure of it the H in ch3 became + and has double bond with carboxyl C. Why pls ...

*August 16, 2015*

**org chem**

My prof asked us the requisites for e delocalization. Sigma e delocalization -Must have c-h bond next to a sp2C Pi e delocalization -Must have sp3 lone pair attach to an sp2C. Prof said there are more requisites besides on what ive written. I think if it has high en? What is ...

*August 16, 2015*

**Urgent math**

Find the partial sum Sn of the arithmetic sequence that satisfies the given conditions. a2 = 5, a5 = 6.5, n = 15 S15 =

*August 10, 2015*

**Urgent math**

A couple needs a mortgage of $300,000. Their mortgage broker presents them with two options: a 30-year mortgage at 8 1/2% interest or a 15-year mortgage at 7 3/4% interest. (Round your answers to the nearest cent.) (a) Find the monthly payment on the 30-year mortgage and on ...

*August 10, 2015*

**Urgent math**

A man gets a job with a salary of $40,000 a year. He is promised a $1900 raise each subsequent year. Find his total earnings for a 10-year period.

*August 10, 2015*

**Urgent math**

Express the repeating decimal as a fraction. 0.156156156...

*August 10, 2015*

**Urgent math**

Find the first five terms of the given recursively defined sequence. an = 3an − 1 + 6 and a1 = 1 a1= a2= a3= a4= a5=

*August 10, 2015*

**org chem**

Why does Oxygen8 has 2 lone pairs? Please help

*August 4, 2015*

**Algebra ASAP**

Suppose that $17,000 is invested in a savings account paying 5.1% interest per year. (a) Write the formula for the amount A in the account after t years if interest is compounded monthly. A(t) = (b) Find the amount in the account after 3 years if interest is compounded daily...

*August 3, 2015*

**Algebra ASAP**

The half-life of krypton-91 ^(91Kr) is 10 seconds. At time t = 0 a heavy canister contains 6 g of this radioactive gas. (a) Find a function m(t) = m02^−t/h that models the amount of ^(91)Kr remaining in the canister after t seconds. m(t) = (b) Find a function m(t) = m0e...

*August 3, 2015*

**org chem**

When a solute dissolved in a solvent A. Freezing pt incrases B. Boiling pt increases C. Vapor pressure increases D. Concentration of the solvent My answer is B.

*August 2, 2015*

**org chem**

Law of partition means? I think it is distribution? How is this applied in extraction involvong immiscible solvent? Help please.

*August 2, 2015*

**org chem**

Ohh. Now i get it!! Thank you dr. Bob!

*August 2, 2015*

**org chem**

I have tried drawing it. But its still correct.. Ch3-ch(c2h5)-ch2-ch2-ch3 I don't see anything wrong about this.

*August 2, 2015*

**org chem**

Answer pls

*August 2, 2015*

**org chem**

2 ethylpentane My answer for this is a correct name and structure but my teacher said it is incorrect.. Why? Please explain.

*August 2, 2015*

**Chemistry**

A neutralisa tionreaction occurs when 120 millilitres of 0.5 mol/l lithium hydroxide(aq) and 160 millilitres of 0.375 mol/l and HNO3(aq) are mixed in a insulated Cup. initially the solutions are at the same temperature. If the highest temperature reached during the mixing with...

*May 30, 2015*

**Chemistry**

If the solubility of Ag2CO3 is 1.3×10^-4 mol/L what is the Ksp? I'm trying to do it but my answer I keep on getting is wrong and doesn't match the text book which is 8.8×10^-12

*May 6, 2015*

**Mathematics**

The distance to the nearest 100,000 km from the earth to the moon is given as 400,000 km. The average speed to the Nearest 500km/h is 3500km/h. Calculate the least and greatest time it takes the rocket to reach the moon I figured out the formula speed = distance / time ...

*March 31, 2015*

**science**

A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.

*February 5, 2015*

**EDU 650**

compare and contrast what the authors identify as 21st century skills with what you would identify 21st century skills

*January 31, 2015*

**statistics**

A multiple-choice test consists of 29 questions with possible answers of a, b, c, d. Estimate the probability that with random guessing, the number of correct answers is at least 14. z-value (Use continuity correction)= Probability=

*November 22, 2014*

**statistics**

An airline company is considering a new policy of booking as many as 182 persons on an airplane that can seat only 160 (Past studies have revealed that only 80% of the booked passengers actually arrive for the flight.) Estimate the probability that if the company books 182 ...

*November 22, 2014*

**Spanish**

Los estudiantes compran los libros

*February 23, 2014*

**math**

The Math-Is-Fun T-shirt Company manufactures and sells screen-printed t-shirts. The fixed costs of operation for the company are $75,750 per month. T-shirts are sold to wholesale buyers for $8.99 each, but only cost the company $3.20 each to produce. If the T-shirt Company ...

*July 6, 2012*

**math**

Find the area of some figure which have radius of 42cm and degree60

*March 10, 2012*

**maths**

x=28

*February 5, 2012*

**Stats**

a die is rolled three times. find the chance that not all the rolls show 3 or more spots

*December 4, 2011*

**Stats**

A bag contains 7 blue marbles, 18 red marbles, and 16 orange marbles. Find the chance that neither draws are orange.

*December 4, 2011*

**child daycare**

wat is a developmental achievement of a two-months-old infant? a. rolling from side to back b.Eruption of teeth c.Good control of head d. Turning toward the source of a sound 2. a condition often brought on by an allergic reaction is a. anemia b.diabetes c.asthma d.seizures

*November 7, 2011*

**Music**

Explain how music and culture influence one another. Provide an ...

*October 12, 2011*

**psychology**

1) What were some of the irrational beliefs and attitudes that the characters displayed?

*May 30, 2011*

**physics**

fgay

*April 16, 2011*

**10th grade**

If a circle has a diameter of 7inches, what is the circumference rounded to the nearest whole number? Use pi=3.14

*November 18, 2010*

**English**

Is it a noun?

*February 22, 2010*

**English**

I nees help with infinitive phrases and if it is a noun, adj., or adv. My question is: The political prisoner refused to denounce his principles.

*February 22, 2010*

**algebra**

y= mc + b

*February 11, 2010*

**math**

what is the fact family for 10, 7 and 8

*January 19, 2010*

**1st grade**

what is the fact family for 4,6 and 9

*January 19, 2010*

**english**

here is another question change the middle to make aother word for a brute (hint rhymes with out) thanks

*December 10, 2009*

**english**

change the first letter to mean a sort of attic no word mention english - Ms. Sue, Thursday, December 10, 2009 at 11:00pm What word are you supposed to use?

*December 10, 2009*

**english**

change the first letter to mean a sort of attic

*December 10, 2009*

**2nd grade**

no othe rword mention "quiet"

*December 10, 2009*

**2nd grade**

change one letter to make the opposite of quiet

*December 10, 2009*

**Food and Nutrition**

foods from animals legumes green and yellow vegetables fruits fats and oils fats and oils staples

*September 18, 2009*

**geography**

what are the 5 main coastal features?

*June 28, 2009*

**helth**

finding wat the wic program gets their funding.

*June 21, 2009*

**Helth**

is there any othe funding they get

*June 20, 2009*

**Helth**

Ok I thing the grands are calle fy's.

*June 20, 2009*

**Helth**

thanks

*June 20, 2009*

**Helth**

700 words paper evaluating the financial aspects of the Wic Program How do they fund their programs? o How reliable are their funding sources? o Do they implement financial accountability measures to ensure that funds are being used properly? o What questions would you ask the...

*June 20, 2009*

**English Composition**

What can we learn about the Early Ancient Civilizations by reading works like The Epic of Gilgamesh?

*June 5, 2009*

**science**

freshwater resource challenge

*January 30, 2009*

**Research Report**

Can somebody help with good resources for a research report on airplanes?

*December 7, 2008*

**English**

did you do this exam? can you please tell me how you did it? I am currently working on it now and it is really confusing. Thanks

*December 2, 2008*

**Algebra 1: 8th Grade**

y = xk

*October 7, 2008*

**Discussion Question 2**

How does the author of AIDS in Africa: Dying by the numbers organize information to build his argument? Does he include any counterarguments? Why or why not? What kinds of statistics, graphs, or illustrations does the author include? In what ways do these visuals strengthen ...

*August 27, 2008*

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