Sunday
September 25, 2016

Posts by elizabeth

Total # Posts: 1,006

chemistry
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.07 % naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr.
September 24, 2016

Algebra one
What is the compatible number of 19% of 30
September 22, 2016

Algebra
1)More than 450 students went on a field trip. Ten buses were filled and 5 more students traveled in a car. a) Write an inequality to represent the situation. Be sure to define your variable. b) Solve the inequality to find the minimum number of people on each bus. b=# of ...
September 17, 2016

Math
Jason received an invoice for $5,000, and the invoice was dated on August 26 with terms of 2/10, n/45 EOM. Please answer the following questions: (1) How much did Jason owe if the bill is paid by September 26? (2) When will be the last day that Jason can receive the cash ...
September 15, 2016

Math
Explain how you know if a number can be divided by 10 evenly
September 8, 2016

Math
Eight increased by the product of 2 and two less than a number
September 4, 2016

Physics
Oh....I get it now! Thanks for your help! This has helped me understand many topics in Physics that we have covered this year! Thank you so much! You have no idea how much relief your help has brought me!
September 3, 2016

Physics
I think this is a two part question, but I don't understand what I am supposed to be solving for:( Do I frist solve for the distance from 0 - 8 seconds and then 9-12 seconds?
September 3, 2016

Physics
A car uniformly accelerates from rest at 3 m/s^2 for 8 seconds. At the end of the 8 seconds the car uniformly brakes at -5m/s^2 for 4 seconds. What total distance is traveled by the car during the 12 seconds of motion?
September 3, 2016

Physics
So, can speed be negative, or is velocity only negative?
September 3, 2016

Physics
Is the initial speed of the ball 0 m/s and the final speed 0 m/s?
September 3, 2016

Physics
A child throws a small ball vertically upwards. The ball is caught at the initial height 1.8 seconds after being thrown. What was the net displacement for the ball? What was the initial speed of the ball? What was the final speed of the ball? How high did it rise?
September 3, 2016

Physics
Thanks!
September 3, 2016

Physics
Do you mind if I verify a couple more questions? My physics background is not very strong:(
September 3, 2016

Physics
Oh...So it pauses for a second and then falls to the ground!
September 3, 2016

Physics
I get it now! I was confused about the final velocity. So, is the final velocity 0 m/s because that is when it hit the ground?
September 3, 2016

Physics
A ball is thrown straight up at an initial speed of 24 m/s. How long did it take to reach maximum height? How high did it rise before falling again? I am confused on how to attempt this problem. Please provide me with some guidance:)
September 3, 2016

Physics
(a) Find the electric field at x = 5.00 cm in Figure 18.52(a), given that q = 1.00X10^-6;C . (b) At what position between 3.00 and 8.00 cm is the total electric field the same as that for –2q alone? (c) Can the electric field be zero anywhere between 0.00 and 8.00 cm? (d...
August 8, 2016

Physics
(a) A narrow beam of light containing yellow (580 nm) and green (550 nm) wavelengths goes from polystyrene to air, striking the surface at a 30.0º incident angle. What is the angle between the colors when they emerge? (b) How far would they have to travel to be separated ...
July 27, 2016

Physics
At what positions is the speed of a simple harmonic oscillator half its maximum? That is, what values of x / X give v = ±vmax/2 , where X is the amplitude of the motion? Hello, I am so confused about this question. I am not really sure where to start. Thank you so much!
July 24, 2016

Physics
Your ear is capable of differentiating sounds that arrive at the ear just 1.00 ms apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times on a day when the speed of sound is 340 m/s?
July 20, 2016

math
Suppose you have a wallet with $5 bills, $10 bills, and $20 bills. If the probability of picking a $20 bill is 4/15, and the probability of piciing a $5 bill is 1/3, what is the probability of picking a $20 bill? a. 1/15 b. 1/5 c. 4/15 d. 2/5 **
May 19, 2016

math
Dina and Masha start out on a bike path 10 km long at the same time. When Dina reaches the end of the 10 km, Masha still has 2 km left to bike. If Dina’s biking speed is 5 km/h, find Masha’s biking speed.
May 15, 2016

Math
Write twenty million, five hundred ten thousand in expanded notation using exponents.
May 4, 2016

life orientation
Sexual abuse
April 25, 2016

Chemistry
I have a .01 M solution of N2, and the concentration of H2 in the same solution is .02. What is the Ksp.
April 24, 2016

math
A set of data items is normally distributed with a mean of 70. Convert the data item to a z-score, if the standard deviation is as given. data item: 80; standard deviation: 15
April 17, 2016

Math
suppose you have two prisms with the same volume. one is shaped like a cube and the other is "longer." which has the lesser surface area?
April 9, 2016

Math
Who were John Venns peers or any mathematicians working on the same thing as John during the same time as him?
April 7, 2016

life orientation
Sexual abuse and violence against women
April 4, 2016

Math
X is a normally distributed random variable with a mean of 8.00. If the probability that X is less than 9.54 is 0.67, then what is the standard deviation of X?
April 2, 2016

Chemistry
A sample of 0, 3220g of an ionic compound containing bromide ions (Br-) is dissolved in water and treated with excess of AgNO3. If the mass of the precipitate of AgBr formed is 0, 6964g, answer: a) what percentage of bromine in molar mass? b) Give the mass of bromine in the ...
April 2, 2016

Chemistry
A sample of 0, 3220g of an ionic compound containing bromide ions (Br-) is dissolved in water and treated with excess of AgNO3. If the mass of the precipitate of AgBr formed is 0, 6964g, answer: a) what percentage of bromine in molar mass? b) Give the mass of bromine in the ...
April 2, 2016

Chemistry
Thanks @DrBob222
March 30, 2016

Chemistry
Show how you would calculate the % yield of hydrogen if 40.0 grams of magnesium react with an excess of nitric acid producing 1.70 grams of hydrogen gas. Mg + 2 HNO3 ---> Mg(NO3)2 + H2
March 30, 2016

Chemistry
The network parameter of molybdenum 0.314 Valley nm and its density to 20° C 10.22 Valley g/cm3. Determine the crystalline structure of the molybdenum
March 28, 2016

Simple Geography
Thank you so much!!
March 26, 2016

Simple Geography
The provisions of the United Nations Conference of the Law of the Sea (UNCLOS) give coastal countries navigational and economic sovereignty over which of the following zones? A) 200-nautical-mile exclusive economic zone B) Export processing zone (EPZ) C) continental shelf D) ...
March 26, 2016

Geography
Thanks so much!!!!
March 26, 2016

Geography
I have a question regarding the answer. Is it geographical area because you can't adjust the population size?
March 26, 2016

Geography
Thank you so much!! You have no idea how much I appreciate your help!
March 26, 2016

Simple Geography
Is geographical area correct? Please help!
March 26, 2016

Geography
Whereas reapportionment adjusts the amount of political representation give to a certain geographical area, redistricting adjusts A) country, state and/or county boundaries. B) population size. C) the gerrymander. D) Federal lands. E) the geographical area. I think the answer ...
March 26, 2016

Chemistry
A rigid cylinder with a moveable piston contains 50.0 liters of a gas at 30c with a pressure at 1.00atm
March 24, 2016

math
A physics test has twenty questions worth 100 points. The test consists of true /false questions worth 3 points each and multiple choice questions worth 11 points each. How many multiple choice questions are on the test ?
March 17, 2016

math
The amount of Sandy earns from babysitting is proportional to the number of hours she works. She earns 45 dollars is 6 hours. what is the hourly rate of Sandy`s earnings?
March 9, 2016

Chemistry 1
i found the answer thanks so much for your time if you have read this!.
February 15, 2016

Chemistry 1
i need help as quickly as possible because i am taking a summative practice test and this question i don't understand how to work it out. can you please explain? here is the question: Arrange the following in order of increasing oxidation number of the sulfur atoms in ...
February 15, 2016

Mathematics
Please correct me if my answer is wrong... thanks 1. 6(11-(3+1)^2+3) =-12 ------------------------------------ Here is my working out 6(11-(4)^2+3 6(11-16+3) 6(-5+3) 6(-2) -12
February 10, 2016

math
Thank you
January 30, 2016

math
The box plots below show the average daily temperatures in January and December for a U.S. city: two box plots shown. The top one is labeled January. Minimum at 0, Q1 at 10, median at 12, Q3 at 13, maximum at 16. The bottom box plot is labeled December. Minimum at 1, Q1 at 5, ...
January 30, 2016

Math
I need help on these two too
January 29, 2016

English
Formal schooling is basically when you get schooled through credital sources
January 27, 2016

Biology
What is an ecological footprint and why does Nothern Americans have such large ecological footprints?
January 27, 2016

Biology
What causes acid precipitation, and what are the negative effects of acid precipitation?
January 27, 2016

Biology
What's an ecological niche?
January 27, 2016

Biology
Define and give examples of predation, competition, and symbiosis.
January 27, 2016

Biology
What is the difference between endangered and extirpated?
January 27, 2016

Biology
What is the difference between tolerance range and optimum range in Biology?
January 27, 2016

Biology
What is an invasive specie, and what are some negative effects of an invasive species?
January 27, 2016

Biology
What is pesticide resistance? Why is it that biological control is a good solution to the problem of pesticide resistance?
January 27, 2016

Biology
What's the difference between Bio accumulation and Bio amplification?
January 27, 2016

Biology
How does Nutrients get affected from surface runoff in Biology? If in detail, you could explain what exactly is Surface Runoff, and what causes it, that'd be of great help !
January 27, 2016

Re:BIOLOGY
Whats the relation between Photosynthesis and Cellular Respiration? Is it, because they have complimentary proccesses?
January 27, 2016

RE:Biodiversity
Sorry I have a lot, final exams tommorow! Whats the relation between Photosynthesis and Cellular Respiration?
January 27, 2016

Biology
Also, sorry if I may ask a lot of questions, I am just preparing for my exam tomorrow.
January 27, 2016

Biology
Thanks Ms.Sue Don't worry
January 27, 2016

Biology
Okay sorry let me explaining properly, My question was which has more biodiversity, Natural Ecosystems or Artificial ecosystems? and I'm,sopposed to explain. I choose Natural but I guess I am wrong.
January 27, 2016

Biology
Wait, so are you saying that Artificial ecosystems actually has more biodiversity? Altho, they have been altered?
January 27, 2016

Biology
How do natural ecosystems have more biodiversity?
January 27, 2016

math
My cousin's car gets 32.81 miles per gallon. She only has 6 gallons left in her tank. How many more miles can the car last?
January 14, 2016

Math
Every two-digit number whose units digit is three times its tens digits
December 23, 2015

Math
Mark is building a custom wooden frame around his flower bed.The length of the frame is 5.45 feet, and the width of the frame is3.275 feet. What is the area of the flower bed without rounding?_________square feet
December 12, 2015

US Legal system and branches of government
private law is a branch of the law that deals with the relations between individuals or institutions.
November 20, 2015

US Legal system and branches of government
i dont understand it
November 20, 2015

US Legal system and branches of government
consider the defination of private law and public law. Discuss the difference between these two sources of law. support with example.
November 20, 2015

US Legal system and branches of government
write 200 word on the three executive offices which affect the health information profession.
November 20, 2015

math
What two numbers have a product of 3.6 and a sum of 3.8
November 9, 2015

Math
The sum of two numbers is 48. One number is 24 more than the other number. Find the numbers. My thinking is X=48-24. X=24
November 5, 2015

math
the 6:00 a.m. temperatures for four consecutive days in the town of lincon were -12.1 c, -7.8 c, -14.3 c, and -7.2 c. what was the average 6:00 a.m. temperature for the four days?
October 20, 2015

Science
Thanks for the help!
October 7, 2015

Georgia State History
Which of the following does not describe part of the Intolerable Acts? Boston's port was closed. There was a tax on molasses. There were limited town meetings. Colonists had to quarter British soldiers in their homes. ** Even if my answer is wrong, can you still talk me ...
October 5, 2015

math
the number of bottles a machine is proportional to the number of minutes the machine operates the machine fills 250 bottles every 20 minutes 0,0 to 10,125 explain why these are the answers
September 30, 2015

pre algebra
robin is making bows to sell at her mothers yard sale she will use 3/4 foot of a ribbon and 2/3 of blue ribbon what is the ratio of the length of the blue ribbon to the red ribbon explain how its 2/3 to 3/4
September 30, 2015

pre algebra
robin is making bows to sell at her mothers yard sale she will use 3/4 foot of a ribbon and 2/3 of blue ribbon what is the ratio of the length of the blue ribbon to the red ribbon explain how its 2/3 to 3/4
September 30, 2015

science
what were your answers?
September 30, 2015

Physics 114
an object is dropped from a height of 7.00 meters and takes 1.19 seconds to fall to the ground. What is the acceleration due to gravity estimated from this measurement? Suppose the experiment above is done five times. Determine the mean fall time and the standard error using ...
September 30, 2015

Proportions
A 130 lbs man burned 194 calories during a 30 minute tennis session. How many calories would a 250 lbs man burn in the same time frame doing the same activity(assuming they burn calories at the same rate)? I just need help figuring out what the equation is, I can't seem to...
September 26, 2015

Language Arts
Which word has a meaning similar to prodigy? -Statue -Babysitter -Athlete -Wonder**
September 17, 2015

English
"Tolerance is the word used most often when this kind of coexistence succeeds, but tolerance is a vanilla-pudding word, standing for little more than the allowance of letting others live unremarked and unmolested. Pride seems excessive, given the American willingness to ...
September 16, 2015

Science
In general what would a scientist do after forming a testable questions? -Design an experiment**** -Develop a hypothesis -Draw a conclusion -Analyze data
September 15, 2015

Ed Tech
Before katie turns in the paper she typed she wants a peer to review it and give her feedback. katie uses her all in one printer to scan her edit,prints, and send them to her friend. An all in oneprinter is -Input device -Output device -Data storage device -Operating system
September 10, 2015

Science
Hello, I just started my chem class today and I am totally stuck on this question: Hurriance Katrina had the 2nd lowest ever recorded barometric pressure at 0.920 mb. Convert this pressure to units of… a. atmospheres. b. Inches of Hg. I know i need to convert but I'm ...
September 2, 2015

SCIENCE!
you plant a seed and water it every day but it does grow
August 28, 2015

statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
August 19, 2015

mathematics
the greatest and the least resultants of two forces acting on a body are 35kN and 5kN respectively,determine the magnitude of the forces,what would be the angle between these forces if the magnitude of the resultant is stated to be 5kN
August 11, 2015

moretlwe
describe a recent service delivery protest in your community or in the neighbourhood.
August 5, 2015

Statistics
The number of books sold over the course of the three-day book fair were: 365, 303, 401. Assume that samples of size 2 are randomly selected with replacement from this population of three values. a. List the different possible samples, and find the mean of each of them. b. ...
July 20, 2015

Statistics
A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Cavalier shows that the mean is 4.5 hours and the standard deviation is .6 hours. If 42 mechanics are randomly selected, find the probability that their mean rebuild time is less than 3.5 ...
July 20, 2015

Statistics
The music industry must adjust to the growing practice of consumers downloading songs instead of buying CDs. It therefore becomes important to estimate the proportion of songs that are currently downloaded. How many randomly selected song purchases must be surveyed to ...
July 20, 2015

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