Friday

February 24, 2017
Total # Posts: 1,652

**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 don't know how to get htis

*January 8, 2013*

**math**

what is the next two numbers in the pattern 75,74,72,69,65,...

*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..

*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 don't 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 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*

**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 didn't go to college or didn't 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 don't 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 don't 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*

**algebra**

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

*November 7, 2012*

**algebra**

The 4200 km trip from New York to San Francisco take 6 h flying against the wind but only 5 h returning. Find the speed of the plane in still air and the speed of the wind.

*November 7, 2012*

**science(reading)**

thank you!!!!

*November 2, 2012*

**science(reading)**

"he proved the existence of neutrons - elementary particles devoid of any electrical charge. In contrast with the helium nuclei (alpha rays) which are charged, and therefore repelled by the considerable electrical forces present in the nuclei of heavy atoms, this new tool...

*November 2, 2012*

**US HISTORY I**

Ms. Sue. Sorry this is my first time posting on this website. I posted the full question to avoid confusion. Let me clarify. My teacher stated that the identifications of these terms would be easy to find in our textbook or on the internet. He then stated that the significance...

*October 31, 2012*

**US HISTORY I**

A New World to the American Revolution Directions: IDENTIFY and give the SIGNIFICANCE of 5 of the 7 terms below. (Caveat! Be thorough! An IDENTIFICATION should answer the four criteria 1.What? 2.Where? 3.When? and 4.Results?, while the SIGNIFICANCE should state Why?) Example: ...

*October 31, 2012*

**Physics**

A 190-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the merry-go-round from rest to ...

*October 31, 2012*

**Science**

I need help with coming up a hypothesis for and Organic Compound lab! Anyone have an idea?

*October 24, 2012*

**physics**

Block 1, of mass1 = 0.550kg , is connected over an ideal (massless and frictionless) pulley to block 2, of mass2 , as shown. For an angle of = 30.0 and a coefficient of kinetic friction between block 2 and the plane of = 0.300mu(kinetic friction), an acceleration of magnitude...

*October 23, 2012*

**Spanish Beg. 1 - help!**

¿Cómo te llamas? = literally means How are you called? Or What's your name? (Most common) ¿Cuál es tu nombre? = What is your name? Me llamo Samantha = I am Samantha Yo soy Samantha = I am Samantha Mi nombre es Samantha = My name is Samantha

*October 22, 2012*

**i need help ss**

1.D 2.b 3.b 4.c

*October 20, 2012*

**social studys**

1. D 2. B 3. B 4. C

*October 20, 2012*

**Math**

Suppose C(x) measures an economy's personal consumption expenditure and x the personal income, both in billions of dollars. Then the following function measures the economy's savings corresponding to an income of x billion dollars. S(x) = x - C(x) (Income minus ...

*October 19, 2012*

**math**

The weekly demand for the Pulsar 25 color LED television is represented by p, where p denotes the wholesale unit price in dollars and x denotes the quantity demanded. The weekly total cost function associated with manufacturing the Pulsar 25 is given by C(x), where C(x) ...

*October 19, 2012*

**earth**

The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]

*October 15, 2012*

**chemistry**

In a bunsen burner experiment, when you place a piece of soot covered chalk over the hottest part of the flame, it changes back to a white color. What is the equation for this process? Thank you

*October 10, 2012*

**reading**

why do the Lina and Doon think tat their arrival has been expected, in the book CITY OF EMBER

*October 10, 2012*

**Chemistry**

if there are 8.3grams of Mg used, how many moles of MgO can you expect to be produced?

*October 3, 2012*

**DEBATE**

How would you present a uniqueness, link,or impact in a policy debate? Someone told me that during the cross examination period. You are supposed to ask a question and once receive the answer you are given permission to add the link but, i forgot how the question was stated. ...

*October 1, 2012*

**Biology**

1. How is both the external and internal stimuli involved in doing this: You are hungry so you reach for an apple in a fruit bowl. 2. Why is a hypothesis important to controlled experiments? Is it becasue you are trying to explain the effect that it would have to a substance ...

*September 27, 2012*

**math**

How many People answered this question so far and plus I agree

*September 24, 2012*

**Physics**

Your car can accelerate at 5m/^2 without a trailer. You add a trailer to your car that has 3 times the mass of your car. At what rate can your car (plus trailer) accelerate now? After accelerating the car travels at a constant speed of 30 m/s. What is the net force acting on it?

*September 23, 2012*

**health**

in through nose out through mouth

*September 22, 2012*

**chemistry**

4. All of these

*September 19, 2012*

**advanced functions math**

You buy a car in 2005 for $7860 and it depreciates linearly. You sell the car for $5040 in 2011.... what does the domain represent in the function? what does the range represent in this function? what is the slope of the linear representation? what is the function that models ...

*September 18, 2012*

**advanced functions math**

You buy a car in 2005 for $7860 and it depreciates linearly. You sell the car for $5040 in 2011.... what does the domain represent in the function? what does the range represent in this function? what is the slope of the linear representation? what is the function that models ...

*September 18, 2012*

**Math**

Ms. Sue I got $45 dollars I multiplied 15 x 3 = 45

*September 12, 2012*

**Math**

Restaurants charge about 3 times the cost of food for items on the menu. A restaurant pays $7 per pound for fish, $2 for a dozen lemons, and $6 for parsley. If 2 fish dinners can be made from this, how much would this meal costs? My answer is $36

*September 12, 2012*

**english**

tan

*September 11, 2012*

**General**

Not much I'm in 10th grade...And have access to a college lab with a teacher that is willing to guide me through

*September 6, 2012*