Friday
December 19, 2014

Posts by Samantha


Total # Posts: 1,358

math
find the unit rate of $122 in 8 days
February 5, 2013

math
the unit of $112 in 8 days
February 5, 2013

Algebra II
Simplify the expression in exponential notation. a*a*a I thought it was a^3 but that was wrong.
February 4, 2013

Math
Select all that justify the following statement. 2 * 1/2 = 1
February 4, 2013

math,probability
I just don't understand how to start it, I need structure , I can figure out the rest, don't know how to get into a strategy.
February 2, 2013

math,probability
Hi, I don't understand a homework question, can anyone please help me? I'm bad at probability. what is the probability that when you pick two cards, you will select at least one king out of two in a deck of six standard cards? (assuming there are no jokers)
February 2, 2013

Chemistry
How do I calculate the joules to heat 17 g of water from 22 degrees C to 78 degrees C?
January 31, 2013

Math
The ratio of the maximum speed of Car A to the maximum speed of Car B is 2:3. Explain whether Car A or Car B is faster.
January 22, 2013

urgent i need help within an hour!
Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55°C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong
January 21, 2013

chem
a was incorrect
January 19, 2013

chem
Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.
January 19, 2013

Math
John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?
January 17, 2013

Percents Using Proportions
Thank you! I will reverse my work now. This was extremely helpful for grasping a new concept.
January 17, 2013

Percents Using Proportions
Here is my (probably incorrect) work so far: 1) n/160 = 125/100 40 160x125=4000 ________ 100 | 4000 Was I suppose to divide it or not? I'm not sure. 2) 714/1295 = n/100 _________ 714/1295=102/185 185 | 10,200 102x100=10,200
January 17, 2013

Percents Using Proportions
I do not understand the wording and/or got stuck while I was working on the following two problems: The attendance at a family reunion was 160 people. This was 125% of last year's attendance. How many people attended the reunion last year? There are 1,295 students ...
January 17, 2013

science-repost! please help
Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this
January 17, 2013

science
The enthalpy of solution of KBr in water is about +198 kJ/mol. Nevertheless, the solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic
January 17, 2013

chem
Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this
January 16, 2013

CJ 216
I would like to mention, really rude answers.
January 12, 2013

CJ 216
I know its confusing because they don't really tell what Uncle Bob has done. I am finding the same difficulty. This website was of no help.
January 12, 2013

chem-
Draw the structures of the two monomers that yield Nomex®. can someone show me?
January 12, 2013

Pre-Algebra
Simplify the expression. Write the result using positive exponents only. (-2x^3y^-4)(5x^-1y)
January 10, 2013

chem
760 torr is wrong
January 10, 2013

chem
A liquid that has an equilibrium vapor pressure of 129 torr at 25°C is placed into a 1-L vessel like that shown below. A few mL of the liquid is introduced into the vessel at 25°C while it has a pressure of 1.00 atm of air in it, without allowing any of the air to ...
January 10, 2013

Chemistry
convert grams to moles then use the equatino to do moles of Na to moles of H2O then convert moles of H2O to molecules by using avogadros number (6.022e23) I believe
January 10, 2013

chem-answer check please
Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...
January 10, 2013

chemistry
Compounds like CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl2F2 is 289 J/g. What mass of ...
January 9, 2013

chem
thanks! also what does a compound have to have to have dipole-dipole and also dispersion forces Identify the type or types of intermolecular forces present in each substance. hydrogen peroxide, HOOH i put dispersion forces and hydrogen bonding. but its wrong. is it also dipole...
January 9, 2013

chem
and would the same be for CH3CH2CH2Cl or CH3CH2Cl where teh first one has more df?
January 9, 2013

chem
so chain 1 has more dispersion force?
January 9, 2013

chem
Which member in each pair has the stronger intermolecular dispersion forces? CH3CH2CH2I or CH3CH2I or neither? how do you know this
January 9, 2013

chem please help!
thanks bobpursley. drbob222 you answered the first part but i also needed helpp on the second
January 8, 2013

chem please help!
Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster? i got neon which is correct but How much faster? how many times? i dont know how to get htis
January 8, 2013

chem
thanks how do i know how much faster?
January 8, 2013

chem
Krypton gas is four times denser than neon gas at the same temperature and pressure. Which gas is predicted to effuse faster?
January 8, 2013

chem
its suppose to be a ratio
January 8, 2013

chem
You have two flasks of equal volume. Flask A contains H2 at 0°C and 1 atm pressure. Flask B contains CO2 gas at 0°C and 2 atm pressure. Compare these two gases with respect to each of the following mass of gas (Flask A:Flask B)
January 8, 2013

plzz HELP me
Hey stop being mean!!!!! It's true she suppose to help, not to give answers. Also she is not going to be there when you take the real test.... What if you're youre teacher asks you questions about this.... Learn little guy..l
January 3, 2013

Math
oh, it's c
December 30, 2012

Math
A car salesman receives $575 a week in addition to 3% commission on all cars whose sticker price is above $4,500. One week he sold a Ford for $8,785 and a Buik for $5,832. How much did he earn that week? A. $749.96 B. $838.55 C. $1013.51 D. $4,385.10 Explain how you got your ...
December 30, 2012

english langage arts
@Writeacher, I don't get why your so 'furious,' all the time or is that your way of showing off. If you can go a day of helping someone without criticizing them, the person will actually want to thank you. And the story is "Fire Pond."
December 30, 2012

Geometry
Two cylinders have the same volume. If the radius of cylinder I is 3 times the radius of cylinder II, then the height of cylinder II is how many times the height of cylinder I? A. 12 B. 9 C. 6 D. 3 Please explain how, if possible.
December 29, 2012

Math
In the town of Niceville, a local lottery is held once a year for the residents. Lottery tickets cost 50 cents apiece. Each lottery ticket contains four numbers, from 1 to 20. The lottery machine will select six numbers from 1 to 20. A winning ticket, worth $100, will contain ...
December 29, 2012

Algaebra
Two functions f and g are defined by f:x = 25 /(3x-2) g:x = x^2 Find the composite function Please show all calculations, thank you!
December 19, 2012

Algaebra
Two functions f and g are defined by f:x = x^2 + 3 g:x = 2x+1 Find the function fg Please help and show all working out,i got the answer for it but i really dont understand it!!! Thank You
December 19, 2012

Complex Algaebra, Plz Help!!
Could you ellaborate further on how you got your answer for b please Damon. The composite function fg thank you
December 19, 2012

Complex Algaebra, Plz Help!!
Sorry i wrote c wrong its the solution of equation fg(x)=2/(x-1) really sorry, had less sleep last night
December 19, 2012

Complex Algaebra, Plz Help!!
If we can assume it means = I think that is right
December 19, 2012

Complex Algaebra, Plz Help!!
Good evening to all around the world. Need help with this question, however i must show my answers supported by the working out. Please help. This question is difficult, the one who solves it for me is my hero!!!! Q11) Two functions f and g are defined by F:x (arrow) 25/(3x-2...
December 19, 2012

Please..
what would happen to the respiratory system if it didn't have the nose, pharynx, larynx, trachea, bronchi, lungs, and mucus? I know what would happen to the human body but what would happen specifically to the respiratory system? Thank you!
December 18, 2012

Biology
what would happen to the respiratory system if it didnt have the nose, pharynx, larynx, trachea, bronchi, lungs, and mucus? I know what would happen to the human body but what would happen specifically to the respiratory system? Thank you.
December 18, 2012

science
Both Jim and his mother have a widow's peak but his father doesn't. Jim marries Lisa, who doesn't have a widow's peak. What is the probability that their children will have widow's peak?
December 18, 2012

science
A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the figure below. When 0.46 kJ of heat is added to the gas, it expands and does 186 J of work on the surroundings. What are the values of ÄH and ÄE for this process?
December 17, 2012

science
An experiment calls for you to use 100. mL of 0.91 M HNO3 solution. All you have available is a bottle of 5.00 M HNO3. How would you prepare the desired solution
December 17, 2012

science
(c) The kinetic energy of the emitted electrons is measured to be 15.2 eV. What is the first ionization energy of Hg in kJ/mol?
December 16, 2012

science
thanks!!!
December 15, 2012

science
Calculate the density of sulfur hexafluoride gas at 703 torr and 23°C. density is mass/volume so how do i get those from what i am given? also ) Calculate the molar mass of a vapor that has a density of 6.735 g/L at 11°C and 743 torr.
December 15, 2012

science
Calculate the number of molecules in a deep breath of air whose volume is 2.68 L at body temperature, 37°C, and a pressure of 743 torr (b) The adult blue whale has a lung capacity of 5.0 103 L. Calculate the mass of air (assume an average molar mass 28.98 g/mol) contained ...
December 15, 2012

science
thanks! for b i used that equation and got the volume to be .400 buts its wrong. do i use the presure from a or do i just use 1atm?
December 14, 2012

science
that was my answer for letter a and i did all of those conversions first and i still got that anwerrs which is wrong. can you do the problem and tell me what you get?
December 14, 2012

science
i got 1.28 but its wrong
December 14, 2012

science
how do i ansewr this question? An aerosol spray can with a volume of 400. mL contains 2.25 g of propane gas (C3H8) as a propellant (a) If the can is at 31°C, what is the pressure in the can? (b) What volume would the propane occupy at STP? (c) The can's label says that...
December 14, 2012

science
A fixed quantity of gas at 22°C exhibits a pressure of 739 torr and occupies a volume of 5.46 (a) Calculate the volume the gas will occupy if the pressure is increased to 1.74 atm while the temperature is held constant.
December 14, 2012

geometry
find the measures bc and ac
December 13, 2012

People
who is a famous person who didnt go to college or didnt graduate high school and is in bad shape because of it. (aka is poor or cant get a job or turned into a criminal etc)
December 12, 2012

ece
1.wich of the following dramatic play behaviors are most typical for a 2-year old child? a.uses realistic props,and repeats routines over and over. b.prefers exciting and danger-packed themesfor play. c.plays in groups of one gender, with lots of dialogue. d.prefers rigid ...
December 11, 2012

math
28 weeks
December 10, 2012

chemistry
what is the concentration of the hydroxide ion in a solution if .12 mol of strontium hydroxide are dissolved in water and the final solution volume is 500. mL?
December 8, 2012

debate
does that mean that companies that supply arms and stuff are the reason why we would go through war/ i dotn understand...honestly i dont understand capitalism at all..:(
December 4, 2012

debate
why would a capitalist society, in general, cause war?
December 4, 2012

chemistry
(a) Construct a Lewis structure for O2 in which each atom achieves an octet of electrons. (Assign lone pairs where appropriate.) i am using marvin sketch and dont know what i need to show
December 2, 2012

chem
Which ionic compound is expected to form from combining the following pairs of elements? yttrium and oxygen i put YO but its wrong
December 1, 2012

biology
why would a One serving of particular food that contains 16 g of carbohydrates, 2 g of proteins, and 10 g of fats hav 300 calories?
November 29, 2012

math
the ratio of the number of men to the number of woman working at tommys pub is 7:2.altogather there are 360 workers at the company. how many of the workers are woman.
November 26, 2012

chem
Arrange the following oxides in order of increasing acidity: P2O5, As2O5, N2O5, SnO2, SeO3, and BaO. (Use the appropriate <, =, or > symbol to separate substances in the list.)
November 26, 2012

Physics. Easy question? Please help
What is the (a) maximum and (b) minimum total resistance value that can be obtained using three resistors whose values are 2.0 ohms, 4.0ohms and 6.0 ohms? The resistors can be used individually, in pairs, or all three at once. Is this a trick question? Is the answer 12 and 2?
November 25, 2012

chemistry
i got BaO < SnO_2 < N_2O_5 < P_2O_5 < As_2O_5 < SeO_3 but its wrong
November 25, 2012

chemistry
Arrange the following oxides in order of increasing acidity: P2O5, As2O5, N2O5, SnO2, SeO3, and BaO. (Use the appropriate <, =, or > symbol to separate substances in the list.) I have no idea how to do this! please help!
November 25, 2012

chemistry
how does aluminum's position on the periodic table relate to its properties? i mean like how does it effect it's properties? thank you
November 24, 2012

math
ok thank you!!
November 23, 2012

math
what is the difference btwn 5^3 and (5)^3? When ever they have a question in which they have a a number squared and then they have another question right after it asking the difference between the same question in parenthesis..is it a trick question? is the answer the same or ...
November 23, 2012

Physics. Free electron density, please help!
A length of wire has a radius of 3.00 × 10-3 m and a resistance of 0.200 Ω. When the potential difference across the wire is 10.0 V, the electron drift speed is found to be 2.98 × 10-4 m/s. On the basis of these data, calculate the density of free electrons in...
November 21, 2012

chemistry help!!
For each of the following pairs, indicate which element has the larger first ionization energy Mg or Al. i put Mg. Repulsion of paired electrons in Mg is more significant than Al's higher effective nuclear charge. but got it wrong. Al. Repulsion of paired electrons in Al ...
November 20, 2012

chem
Write the condensed electron configurations for the following atoms and indicate how many unpaired electrons each has. for Ca and Y for Ca i got [Ar] 4s2 but it got cuonted wrong
November 18, 2012

algebra
An investor invested a total of $2,600 in two mutual funds. One fund earned a 5% profit while the other earned a 3% profit. If the investor's total profit was $98, how much was invested in each mutual fund? The amount invested in the mutual fund that earned 5% was $ ? The ...
November 18, 2012

algebra
An investor invested a total of $500 in two mutual funds. One fund earned a 8% profit while the other earned a 4% profit. If the investor's total profit was $32, how much was invested in each mutual fund? The amount invested in the mutual fund that earned 8% was? The ...
November 16, 2012

4th grade math
Round 546 round to the ndarest hundred
November 15, 2012

math
2.20
November 14, 2012

chem
Among the elementary subatomic particles of physics is the muon, which decays within a few nanoseconds after formation. The muon has a rest mass 1.126 109 times that of a proton. Calculate the de Broglie wavelength associated with a muon traveling at a velocity of 3.35 104 cm/s.
November 14, 2012

IT 235
Post your response to the following questions: For which types of image creations might it be beneficial or necessary to add text? Which text effects do you like to use? How will your final project include text?
November 14, 2012

chem
please do not spam!
November 13, 2012

chem
If the detector is capturing 6. 107 photons per second at this wavelength, 1820 nm. what is the total energy of the photons detected in one hour? I got 2e7 but its wrong
November 13, 2012

Physics
A string that passes over a pulley has a 0.373 kg mass attached to one end and a 0.620 kg mass attached to the other end. The pulley, which is a disk of radius 9.50 cm, has friction in its axle. What is the magnitude of the frictional torque that must be exerted by the axle if...
November 12, 2012

algebra
It takes a passenger train 2 hours less time than it takes a freight train to make the trip from Central City to Clear Creek. The passenger train averages 96mi/hr while the freight train averages 64mi/hr. How far is it from Central City to Clear Creek?
November 11, 2012

MAT 116
A tugboat goes 180 miles upstream in 10 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current.
November 11, 2012

MAT 116
The perimeter of a rectangle is 28 ft. The length is 10 ft longer than the width. Find the dimensions. Write a system of linear equations and solve the resulting system. Let x be the length and y be the width.
November 11, 2012

chem
calculate the delta H for 3 Fe(s) + 4 CO2(g) ¨ 4 CO(g) + Fe3O4(s)
November 8, 2012

Physical Education
Tom served to Sue, who set up Stacey for a spike. Stacey went up for the spike and hit it into the ground on Team A's side. In the process of spiking the ball, Stacey hit the net with her hand. Who won the point and why?
November 7, 2012

Science
Many portable gas heaters and grills use propane, C3H8(g), as a fuel. Using standard enthalpies of formation, calculate the quantity of heat produced when 11.90 g of propane is completely combusted in air under standard conditions. I got -600 kj but its wrong
November 7, 2012

algebra
Camille can swim against the current at 1.5 m/s and with the current at 3.5m/s. Write an equation that expresses each fact. How fast can she swim in still water?
November 7, 2012

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