Monday
February 8, 2016

Posts by Summer

Total # Posts: 266

physics
What is the direction of a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
November 8, 2012

math
the manager of a take out pizza parlor needs to hire pizza makers and cahiers for the evening shift. the total number of employees of both kinds can be at most 16, and the ratio of cashiers to pizza makers must be at least 3 to 5. Also, each pizza maker can answer 12 phone ...
September 12, 2012

Math
It took Markus half an hour to drive home from work.He averaged 34 miles per hour. How far does Markus live from work?
September 9, 2012

stats
611
July 7, 2012

Chemistry
Iron (III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2O3 are formed when 16.7 g of Fe reacts completely with oxygen? a. 12.0g b. 23.9g c. 47.8g d. 95.6g
June 21, 2012

math
if 34 baby boys were born in a week and that was 54% how many girls were born in that week
March 27, 2012

math
Solve for X 0.0421=0.0015-x/0.025+1/2x PLEASE HELP!!!
March 9, 2012

Pre-Algebra
x=(-9,0) y=(0,-6)
February 28, 2012

Inferential Statictics
Welsh, Davis, Burke, and Williams (2002) conducted a study to evaluate the effectiveness of a carbohydrate-electrolyte drink on sports performance and endurance. Experienced athletes were given either a carbohydrate-electrolyte drink or a placebo while they were tested on a ...
February 27, 2012

math
Q=3x^2+4y^2 if x+y=7 what is minimum value for Q. I have absolutely no idea how to solve this problem.
February 12, 2012

chemistry
if we combust 4.23 x 10^24 molecules of propane how many grams of carbon dioxide and water you will produce ?
February 7, 2012

Chemistry
What is the concentration of SO3^2- in a 0.043 M solution of Sulfurous acid (H2SO3) in water? The value of Ka1 for H2SO3 is 1.300 x 10-2 and the value of Ka2 is 6.300 x 10-8.
January 22, 2012

Chemistry
I'm doing online chemistry homework, and the site keeps telling me I have the wrong answer, but I'm not sure what I'm doing wrong. please help? What is the pH of a 0.089M solution of phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 E-2 and ...
January 22, 2012

Chemistry
Oops, sorry. I understand now, thank you.
January 21, 2012

Chemistry
What would the Ka for this be?
January 21, 2012

Chemistry
A solution that contains 2.047 x 10^-1 M of acid, HA, and 1.808 x 10^-1 M of its conjugate base, A-, has a pH of 4.196. What is the pH after 1.629 x 10^-3 mol NaOH is added to 5.961 x 10^-1 L of this solution?
January 21, 2012

Chemistry
A chemist is given an unknown base. She finds that a 1.0461 M aqueous solution of this base has a pH of 13.065 at 25oC. What is the value of Kb for this unknown base ?.
January 17, 2012

Chemistry
How many mL of a solution of NaOH with pH equal to 1.395 x 101 do you need to mix with pure water to obtain 399 mL of a final solution with pH equal to 9.066 ?
January 17, 2012

Chemistry
What is the pH of a 0.051 M solution of Phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 x 10-2 and the value of Ka2 is 7.000 x 10-7.
January 17, 2012

Chemistry
Thank you
January 17, 2012

Chemistry
What is the [H+] in a 0.98 M solution of formic acid? The Ka of formic acid is 1.8 x 10-4
January 17, 2012

Chemistry
0.100 M
January 10, 2012

Chemistry
Consider the titration of 80.0 mL Ba(OH)2 by 0.400 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. a.) 0.0 mL *Which molecular equation do I use? b.) 20.0mL Ba(OH)2__+2HCl_+=>+_BaCl2_+____2HOH 80.0 mL__20.0mL 0.100M___0....
January 10, 2012

Chemistry
What is the balanced equation for Ba(OH)2 + HCl?
January 10, 2012

Chemistry
The reaction describing the formation of ozone from oxygen is shown below. 3 O2(g) <--> 2 O3(g) Calculate Grxn at 288 K for this reaction in a flask where [O2] = 3.419 x 10-2 M and [O3] = 5.783 x 10-4 M. Assume G° = 326 kJ. Use molarity to construct the reaction ...
January 2, 2012

Chemistry
For the reaction: 2 NO(g) + 1 O2(g) <--> 2 NO2(g) Calculate K, the equilibrium constant, from thermodynamic data at 281 K. (Hint #1: Assume that S and H do not change with temperature.) (Hint #2: Work in J/mol)
January 2, 2012

Chemistry
Find delta G knot for the following reaction: 2Ch3OH(l) + 3O2(g) --> 2CO2(g) + 4H2O(g)
January 2, 2012

Chemistry
For the reaction below 2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(g) calculate Srxn at 298 K. (Hint: Use a table of thermodynamic data commonly found at the back of chemistry textbooks.)
January 1, 2012

Chemistry
Thank you Dr. Bob.
December 9, 2011

Chemistry
A researcher is studying the decomposition of A as shown by the general reaction below: 2 A(g) 4 B(g) + 2 C(g) Initially, the scientist fills an evacuated 1.772 L flask with 3.710 x 10-1 moles of species A. Upon equilibrium, it is determined that the concentration of A is 4....
December 9, 2011

Chemistry (Equilibrium)
Oh! Thank you :)
December 9, 2011

Chemistry (Equilibrium)
Given the reaction below 2NOBr(g) <==> 2NO(g) + Br2(g) and the value of Kc = 1.98, at a temperature of 480 K what is the value of Kp ? (Hint: Use the value of R in the appropriate units.) I used the equation Kp=Kc(RT)^Delta N Then plugged in to get Kp=1.98(.0821x480k)^-1...
December 9, 2011

Calculus
Find the RMS value of the function i=15[1-e^(-1/2t)] from t=0 to t=4 A. 7.5[sqrt(1+4e^-2 -e^-4)] B. 7.5[sqrt(4-2e^-2 +e^-4)] C. 7.5[sqrt(4+4e^-2 -e^-4)] D. 7.5[sqrt(5-2e^-2 +e^-4)]
November 28, 2011

Psychology
If psychological needs have presumptive brain or physiological correlates, are they still psychological needs?
November 10, 2011

4th grade Math
How can making small groupsh help youe estimate large numbers?
September 28, 2011

psychology
Name one to three important theorists associated with biological psychology.
September 26, 2011

Chemistry - HELP PLEASE
Please help
September 25, 2011

Chemistry
Calculate Delta G for H2O(g) + 1/2 O2(g) <-> H2O2(g) at 600. K using the following data: H2(g) + O2(g) <-> H2O2(g) k = 2.3 X 10^6 at 600. K 2H2(g) + O2(g) <-> 2H2O(g) k = 1.8 X 10^37 at 600. K
September 25, 2011

Chemistry
How do I find the equilibrium constant for 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g) at 825 degrees celcius, assuming that delta H and delta S knot do not depend on temperature, and Delta H is -908 KJ and Delta S is 1206 KJ?
September 25, 2011

Chemistry
Calculate Delte G Knot for H20(g) + 1/2 O2 <-> H2O2(g) at 600. K, using the following data: H2(g) + O2(g) <-> H2O2 (g) K = 2.3 X 10^6 at 600. K 2H2(g) + O2(g) <-> 2H20(g) K= 1.8 X 10^37 at 600. K
September 22, 2011

Psychology
Part F is what i need help on this is due in a few hours please help!! Thanks
September 19, 2011

Psychology
Please I need help understanding this!!!
September 19, 2011

Psychology
Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 -2 (c) figure the correlation coefficient; (d) figure ...
September 19, 2011

Psychology
Twenty students randomly assigned to an experimental group receive an instructional program; 30 in a control group do not. After 6 months, both groups are tested on their knowledge. The experimental group has a mean of 38 on the test (with an estimated population standard ...
September 19, 2011

Psychology
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of sunlight. To test...
September 19, 2011

Physics
18.615
September 13, 2011

psychology
A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a ...
September 12, 2011

Trig
Use linear velocity to find out how many miles per hour Jethro's truck is going. In 15 seconds, Jethro's truck's 24-inch diameter tires rotated 101 times.
September 4, 2011

Chemistry
Which of the following solutions of strong electrolytes contain the largest number of ions: 100.0 mL of 0.30 M AlCl3, 50.0 mL of 0.60 M MgCl2, 200.0 mL of 0.40 M NaCl?
August 31, 2011

Chemistry
How do you assign oxidation states for each atom in the following compounds? 1. KMnO4 2. NiO2 3. Na4Fe(OH)6 4. (NH4)2HPO4 5. C6H12O6
August 23, 2011

Chemistry
Predict and balance the following organic reactions. 1. Ethanol(ethyl alcohol) and methanoic acid(formic acid) are mixed and warmed. 2. Ethanoic acid is combined with propanol.
August 19, 2011

english
no error
June 15, 2011

Chemistry
Solved, Nevermind.
June 14, 2011

Chemistry
Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 0.155gx46.0 = moles moles x 6.02 E23 = answer Part 1 Answer: 2030000000000000000000 Part 2: How many atoms of N do you...
June 14, 2011

chem 1151
20.0% acetone 18.0% Ethyl Alcohol 62.0% water You take the mL you're trying to find divided by the whole solution, then multiply by 100. For example, you have 50.0mL/250.0mL = 0.20 Take 0.20 x 100 and it will give you the percent.
June 14, 2011

Chemistry
I found this answer, thank you :)
June 14, 2011

Chemistry
Part 1: Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? 2030000000000000000000 was the correct answer Part 2: How many atoms of N do you have ?
June 14, 2011

math
-4<2x-3<4 add 3 to all sections -1<2x<7 Dive each section by 2 -0.5<x<3.5
June 14, 2011

Chemistry
Than you can be the one to tell my prof that, sir :)
June 14, 2011

Chemistry
Our work is online, and I tried to enter it as 2.03E21 and it would not accept it. It only accepts the answer if everything is correct. Thank you :)
June 14, 2011

Chemistry
Thank you :) 2030000000000000000000 was the correct answer Part 2: How many atoms of N do you have ?
June 14, 2011

Chemistry
Each molecule of NO2, nitrogen dioxide, consists of 1 atom of N and 2 atoms of O. If you have 0.155 g. of NO2, how many molecules of NO2 do you have ? If you could, please include steps as to how to do the problem. Thank you
June 14, 2011

Alegbra 1
An airplane flies 750 miles due west in 1 1/2 hours and 750 miles due south in 2 hours. What is the average speed of the airplane?
May 20, 2011

Social studies
Why did people long ago form communities
May 3, 2011

Math
The area of a photograph is 15 square inches. If the width of the photograph is 3 inches, what is its length?
April 11, 2011

Chemistry
A titration is performed by adding .600 M KOH to 40.0 mL of .800 M HCl. Calculate the pH before addition of any KOH. Calculate the pH after the addition of 5.0 mL of the base. Calculate the volume of base needed to reach the equivalence point. What is the pH at the equivalence...
April 1, 2011

geometry
elbert wants to plant grass seed in his backyard. His yard is shaped like a rectangle that is 6 meers by 7 meters. He plans to use a cup of seed for every square in his yard. How many cups of grass seed will he need?
March 30, 2011

Geometry
pa and pb are tangents to circle from point p. chord ab is drawn. find the number of degrees contained in angle pab if angle apb contains a)80 degees b 40 degrees c) 60 degrees d) 90 degrees e) 120 degrees can some1 pllllz explain this 2 me!
March 2, 2011

Math
Here is a question that I am really stuck on and I need some help!!: In the Unites States, about one person in eight lives in California. To the nearest percent, what percent of people in the Unites States live in California?
February 15, 2011

math
A vehicle leaves a skid mark of 40 ft before stopping. What has the approximate speed of the vehicle before it stopped? (the formula is speed=.7 times length, then find the square root times 5.5) Is is 25-35 mph?
October 26, 2010

math - check plz
She has 2 to the 10th power of fruit flies in each of 2 to the 2nd power. How many fruit flies does she have in all? (answer as power) 2to the 11th power?
October 25, 2010

Science
How are the nucleus, genetic material, chromosomes, genes, DNA, and base pairs interrelated?
October 24, 2010

Actuarial Math
Fund A accumulate at 8% effective and fund B accumulates at 10% effective. at the end of 20 years, the total of the two funds is $3000. at the end of 10 years the amount in fund A is half the in Fund B. what is the total of the two funds at the end of 5 years
October 11, 2010

Actuarial Math
The sum of the accumulated value of 1 at the end of four years at a certain effective rate of interest, and the present value of 1 to be paid at the end of four years at an effective rate of discount numerically equal to I is 2.0098 Find the rate
October 11, 2010

science
An airplane flies at 200km/hr. What is the velocity?
October 5, 2010

6th grade
I keep mine on a bookshelf my dad and I built ourselves. I, mine, my, I=pronouns bookshelf, dad=nouns I have to identify all of the nouns, pronouns and adjectives.
September 21, 2010

college chemistry
Calculate the amount of heat required to heat 80 grams of water from 10 to 53°C. The specific heat capacity for water is 4.184 J/g°C.
September 7, 2010

math
1. A baseball diamond is actually a square, 90 feet on each side. What is the distance from third base to first base? 2. The equation gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a) Solve this equation for h b) Mammoth ...
September 4, 2010

math
1. A baseball diamond is actually a square, 90 feet on each side. What is the distance from third base to first base? 2. The equation gives the distance, D, in miles that a person can see to the horizon from a height, h, in feet. a) Solve this equation for h b) Mammoth ...
August 30, 2010

6th grade English
His special style and powerful performance have long drawn fans to Kenney's music. Would the subject be style and performance and the verb have drawn
August 20, 2010

math
the speed of a train a is 6 mph slower than the speed of train b. train a travels 220 miles in the same time it takes train b to travel 250 miles. find the speed of each train
August 19, 2010

math
i need Help i have no idea how to simplify this expression! x/x+5 + 7x+10/x^2+5x
June 6, 2010

world history
Is this correct? What was Hong Xiuquan famous for? Answer: He was famous for establishing the Taiping Heavenly Kingdom.
May 21, 2010

World History
Can you help me with this question What are the boers famous for?
May 21, 2010

science
why do crickets chirp louder when it is warm. I think it is because they are ectotherms but i really do not know how to explain why. Thanks.
April 8, 2010

math
Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. I have to do a lot of examples for homework like this so can someone show me so I can do my other problems? Thanks! Consider a ...
April 7, 2010

math
Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the x-axis are isosceles ...
April 6, 2010

math
Can someone please explain this problem to me: I have to use integrals to find volumes with known cross sections but i just don't understand. Thanks! Consider a solid bounded by y=2ln(x) and y=0.9((x-1)^3). If cross sections taken perpendicular to the x-axis are isosceles ...
April 6, 2010

science
A skater is coasting alone the ice without sexerting any apparent force. Which law of motion explains the skater's ability to continue moving?
March 11, 2010

Science
After a soccer ball is kicked into the air, what force or forces are acting on it?
March 11, 2010

scientific notation
what is 90,000 in scientific notation
January 10, 2010

MATH
I have math questions I need to check my answers can you please help me 1. 4x4x4x4x4 as a power of 4 answer 4 to the fifth power 2.a bedroom is 10 ft by 11 ft what is the perimeter? answer 42 ft evaluate 72/8-9/3=6 3.Jamal is fencing a rectangular field that measures 25 ft by ...
September 5, 2009

MATH
please check my answers prime factorization of the number 117 =3x3x13 6/25 divided by 2/15=5/9
September 5, 2009

literature
Snowy Woods figurative language used.. "To watch his woods fill up with snow." "He gives his harness bells a shake To ask if there is some mistake. The only other sound's the sweep Of easy wind and downy flake." Road not Taken "Because it was ...
August 21, 2009

literature
No it doesn't look like either poems use figurative language
August 21, 2009

literature
Robert Frost's "The Road Not Taken" and "Stopping by Woods on a Snowy Evening"....how are both poems similar? besides the theme but rhyme scheme, use of figurative language or irony
August 21, 2009

English Composition
Ok. How about...: Students should not be discriminated against other students based on their family's social status and income.
June 25, 2009

English Composition
I'm writing a synthesis paper for my college english composition class. My topic is: The relationship between social class and public education. So far, my thesis: My argument is that students in public education should not be discriminated against based on what social ...
June 25, 2009

7th grade input/output patterns
Determine if each relationship represents a function ×|2|5|8|3| Y|4|5|6|7|
April 17, 2009

college
so it would be Michael has lived in Portland, Oregon; San Francisco, California; and Providence, Rhode Island.
April 13, 2009

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. Next>>