Monday
September 1, 2014

Posts by rina


Total # Posts: 60

Chemistry
Consider the titration of 100.0 mL of 0.260 M propanoic acid (Ka = 1.3 ✕ 10−5) with 0.130 M NaOH. Calculate the pH of the resulting solution after each of the following volumes of NaOH has been added. (Assume that all solutions are at 25°C.) (a) 0....
December 8, 2013

chemistry
Ok so I was making it harder than I thought and should have followed my instinct when my brain kept saying limiting reactant. Im gonna get it done then, last problem on homework. Thank You Dr. Bob
November 2, 2013

chemistry
sorry, I get distracted easily: Consider the reaction between 60.0 mL of liquid ethanol (C2H5OH; density = 0.789 g/mL) and 28.0 L of O2 at 27.0°C and a pressure of 1.51 atm. The products of the reaction are CO2(g) and H2O(g). Calculate the number of moles of H2O formed if ...
November 2, 2013

chemistry
Consider the reaction between 60.0 mL of liquid ethanol (C2H5OH; density = 0.789 g/mL) and 28.0 L of O2 at 27.0°C and a pressure of 1.51 atm? I am unsure of where to start with this problem...
November 2, 2013

Diff Eq
Consider a body moving along a straight line, in the presence of an external force providing constant acceleration a. In the absence of other forces, the velocity v of the body would increase without bound if a 6= 0. But in reality, there will always be a decelerating force, ...
September 5, 2013

Math! Please help! anyone!
Sorry. It's because it's a new semester and I got 6 homeworks to finish. I guess I was being a little impatient.
January 9, 2013

Math! Please help! anyone!
Please help me on my previous question for math! I really need help!
January 9, 2013

Math
Nevermind, because 9 8s bigger than 3 of course so it round down to 90 cents.
January 9, 2013

Math
yes, that is right! Because I kept rereading my math book and i found out it says to round off to the nearest ten cents. Thank You DrBob222!
January 9, 2013

Math
72.927 kw-hr. Am I right DrBob222? but do I have to round off 72.927 to the nearest cents?
January 9, 2013

Math
Find the cost of 999 kw-hr at 7.3 cents per kw-hr.
January 9, 2013

math
20/21 is your answer
January 1, 2013

math
alkdjflkajd
January 1, 2013

Medical Biology
Which of the following condition could result from years of smoking? a) tuberculosis b) emphysema c) empyema d) atelectasis
January 1, 2013

Math
Sam Quaker receives a salary of $300 per week plus a 5 and 1/2% commission on his sales. Last week he sold $3,880 worth of merchandise. How much did Mr. Quaker make last week?
December 14, 2012

MATH! HELP!
I got 634.10! I really got it wrong! But I'm still correcting it.
December 14, 2012

NMR Organic Chemistry multiple choice
I would say C. Heptanedioic acid is a chiral molecule. Please let me know if its right.
October 12, 2012

AP Chem
Complete and balance the following equations and identify oxidizing and reducing agents. S+HNO3---->H2SO3+N2O
September 26, 2012

Trig
The length of the base of an isosceles triangle is one fourth the length of one of its legs. If the perimeter of the triangle is 16 inches, what is the length of the base?
June 11, 2012

College Algebra
How would I go about solving for x in the equation: ln(4x-2)-ln(4)=-ln(x-2) Thanks in advance
June 7, 2012

Math
Marissa is 12 which means the younger bro is 9
June 7, 2012

Trig
Rewrite 7pi/5 in degrees.
April 10, 2012

English
Does everybody have a dark side? I need to write 4 paragraphs and I don't know how to start.
April 8, 2012

Trigonometry
8pi/17
April 8, 2012

Trigonometry
Find the supplement of 8pi/17.
April 8, 2012

Calculus
A certain calculus student hit Mrs. Evans in the head with a snowball. If the snowball is melting at the rate of 10 cubic feet per minute, at what rate is the radius of the snowball changing when the snowball is 1 foot in radius?
November 6, 2011

math
obesity is defined as a body mass index of 30kg/m2 or more. A 95% confidence interval for the percentage of U.S. adults aged 20 years and over who were obesity was found to be 22.4 to 23.5%. What was the sample size???? Can you please show your work?? Thanks
October 6, 2011

Word Problems
If your car gets 18 miles per gallon of gasoline, how many pints of gas will you need to take a 698- mile trip? I no that 1pt = 480ml and 1g= 3840 ml so do I x 18 miles per gallon by the amount of pints in a gallon?
July 22, 2011

Math for pharmacy Tech
My daughter Kim teaches and notes that the average student uses 75 sheets of paper every week. A) How many sheets will a student use in a 42-week school year? B) How many sheets will a class of 26 students use in a week? Not sure how to approach the problem. Do I first ...
July 21, 2011

Perform the indicated operations
X I I I x I V 10 1 1 1 x 1-5= 4 right above i have what each numerical # represents but i dont no if thats correct so far. How do i solve this?
March 16, 2011

Converting Roman numerals to arabic Numbers
Oh ok I got it now thank you so much
March 15, 2011

Converting Roman numerals to arabic Numbers
How does IX equal 9? I thought X represented 10 and I represented 1?
March 15, 2011

Converting Roman numerals to arabic Numbers
1) CCXIX C = 100 X = 10 I = 1 because there are 2 C's I added them together and I got 200 because there are 2 X's I added them together and got 20 because there is 1 I that equaled 1 So I added 200 + 20 + 1 = 221 which is my final answer But according to the back of ...
March 15, 2011

Adding Fractions
1) 2/3 + 1/8 = 19/24 I do not understand how they got 19/24 can you help me with the steps to show me how. Thank you
March 14, 2011

Dividing Decimals
I need Help with solving these problems. If you could show me the steps I think I will be able to get it. 1) 0.87/0.2 = 4.35 2)4.4/0.3 = 14.66 3)5.0/5.5 = 0.90 I got the answer by Calculator but when I do it myself I dont see how they got the answer. Please help. Thanks
March 14, 2011

math
You can break up 9 to 3 x 3. Then you have 3 x 3 x 3= 27 I don't know how much easier that makes it, but I guess you could do it that way. The smaller the numbers you're working with, the smaller the chance you'll mess up.
February 22, 2011

STATS
Samples of both surface soil and subsoil were taken from eight randomly selected farms in a county. The soil samples were analyzed to determine both surface pH and subsoil pH, which yielded the following results: Farm 1 2 3 4 Surface pH: 6.55 5.98 5.59 6.17 Subsoil pH: 6.78 6....
February 22, 2011

Statistics
A sociologist is testing the null hypothesis that the percentage of school superintendents who earn an annual salary of more than $150,000 is greater than or equal to 50%. The sociologist conducts a poll of 1100 randomly selected superintendents and finds that 565 earn more ...
February 21, 2011

Biology
Ok thank you I think that might will help
August 31, 2010

psychology
lol yes I am confused genetics is not my subject although I love psychology I can do without the gentics portion. But thank you so much for bring patient with me in my quest for the answer
August 26, 2010

psychology
Ok I think I got it now if I am not right this time am just going to have to get this one wrong lol. So I re-read my book and I believe that the answer is D now because the book states the following: "Gentic explanations, however, have a fatal flaw. They use heritability ...
August 26, 2010

psychology
Within groups, differences in intelligence are highly correlated with_______. Between groups, differences are highly correlated with ________. a) heritability: environment b)environment: genes c) heritability:random error in measurment d) genes: the heritability estimate my ...
August 26, 2010

Psychology
Ok now am confused, if its not A or B then is it C? because the book states the following "although intellectual differences within groups are at least partly genetic in orgin, that does not mean differences between groups are genetic.
August 26, 2010

Genes
Genetics and what we inherit from our biological parents play a significant role in our intelligence level. In fact, researcher have found that: a) adotpted children are more similar in IQ to their adoptive parents than to their birth parents b) identical twins raised apart ...
August 23, 2010

psychology
Peter and Maria are adopting a child whose biological parents have low IQs. They want to know if this child, too is likely to have a low IQ? Which one of the following is the best response to their question? a) While IQ is heritable at least in part, environmental influence ...
August 23, 2010

psychology
sara overhears her 21 year old son, joe, telling his friends on the phone that he wants to have sex with two girls he just met at the mall. joe's desire: a) expresses the male tendency to commit to a relationship b) is an example of male nurturance c)expresses the male ...
August 23, 2010

psychology
evolution has installed tendencies in our selection of a mate. Two of the strongest predictors in human mate selection today are: a) wealth and attractive b) attractiveness and youth c) similarity and proximity d) the best genetics and submission i chose A but i think this is ...
August 23, 2010

psychology
lol i guess i was because i was thinking in terms of now how things are and how technology is taking over as far as learning
August 23, 2010

psychology
Parents can help their children acquire language by: a) reading and talking with them b) correcting every grammatical mistake c)placing them in front of a computer d) eating foods rich in vitamin A Am confused between b and c but i am leaning more towards c
August 23, 2010

Psychology
i got it now i did go back and re read it and i believe it is B) A natural inclination, because they relate to language Thank you so much sometimes the answer is really right in front of your face :)
August 23, 2010

Psychology
I agree math in it self is its own language but the question is, is it present in us from birth or are we born with it and need to be challenged in order for it to develop effectively?
August 23, 2010

Psychology
Basic arthmetic is not an easy task for Jeanne. In fact, she has to work hard at understanding mathematical concepts. She finds it hard to believe that basic math skills are: A) present in all species B) A natural inclination, because they relate to language C) Present in all ...
August 23, 2010

science
what does liver do
April 5, 2009

CULTURAL DIVERSITY
hey um i cant find anything on how cultural diversity occurs i wish someone would out it out there this is for a grade and i cont affrod another frakin zero. this looks like a good site so plz put hoe cultural diversity happens for goodness sakes. i dont want to have to ask ...
April 3, 2009

3rd grade math
bob is the catcher
March 7, 2009

Speech
Well i just started this topic and I viewed Al Gore's presentation on global warming.I thought it had some good ideas. Thanks
February 21, 2009

Speech
I have to give a problem-solution speech on "Global Warming" what would i put into this? I need to point out some good solutions to the problem. It has to be a really interesting speech for the audience any pointers would be good. I also need a power point to go ...
February 21, 2009

Calculus
Thanks. Actually i did not learn that other rule yet and I don't think we will but thanks anyway it was helpful. I solved using bobpursley's idea and got sqrt2/2=1/sqrt2.
February 21, 2009

reading
I need a summary for the following report.Antisemitism (alternatively spelled anti-semitism or anti-Semitism; also rarely known as judeophobia) is prejudice against or hostility toward Jews as a group. The prejudice or hostility is usually characterized by a combination of ...
December 8, 2008

math
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October 20, 2008

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