Wednesday

November 25, 2015
Total # Posts: 1,051

**Chemistry 105**

A gas mixture with a total pressure of 745 mmHg contains each of the following gases at the indicated partial pressures: CO2, 257 mmHg; Ar, 123 mmHg; and O2, 160 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas? What mass of helium gas...
*October 23, 2011*

**Chemistry 105**

A sample of nitrogen gas in a 1.86-L container exerts a pressure of 1.32 atm at 20 C. What is the pressure if the volume of the container is maintained constant and the temperature is raised to 354 C?
*October 23, 2011*

**Chemistry 105**

A sample of N20 gas has a density of 2.65 g/L at 298 K. What must be the pressure of the gas (in mmHg )?
*October 23, 2011*

**Chemistry 105**

A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium. What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.3 atm?
*October 23, 2011*

**Chemistry 105**

A sample of gas has an initial volume of 33.0 L at a pressure of 1.1 atm. If the sample is compressed to a volume of 10.0 L, what will its pressure be? (Assume constant temperature.)
*October 23, 2011*

**chemistry 105**

Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)-->2LiN(s) What mass of lithium (in g ) is required to react completely with 59.9 mL of N2 gas at STP?
*October 23, 2011*

**Chemistry 105**

What is the pressure in a 10.0-L cylinder filled with 0.470 mol of nitrogen gas at a temperature of 329 K?
*October 23, 2011*

**5th Grade Science**

What are the 4 main causes of erosion?
*October 20, 2011*

**5th Grade Science**

What does weathering erosion and deposition do?
*October 20, 2011*

**5th Grade Science**

Prevention of erosion??
*October 20, 2011*

**5th Grade Science**

Creation of landforms??
*October 20, 2011*

**Healthcare professionals**

Hospitals frequently seek ways to ensure survival. Sometimes an adversarial climate cannot be avoided if the action that is being considered is controversial. For example, a hospital may seek to expand its market reach by opening an inpatient drug treatment facility in a small...
*October 20, 2011*

**math**

determine the maximum or the minimum value for each a)y=2x^2+12 b)y=-3x^2-12x+15 c)3x(x-2)+5
*October 16, 2011*

**Math( please help)**

thank you !!!
*October 16, 2011*

**Math( please help)**

a ball is kicked in the air from the top of a cliff. the path the ball travels is given by the equation h(t)=-5t^2+17t+22 where h(t) is the height in metres and t is the time in seconds a) what is the maximum height that the ball reaches b)when will the ball hit the ground
*October 16, 2011*

**Math( please help)**

a ball is kicked in the air from the top of a cliff. the path the ball travels is given by the equation h(t)=-5t^2+17t+22 where h(t) is the height in metres and t is the time in seconds a) what is the maximum height that the ball reaches b)when will the ball hit the ground
*October 16, 2011*

**arithmetic**

THE TOTAL AGE OF GROUP OF PARENTS IS 342.A NEW PARENT AGED 48 JOINS THE GROUP AND THE AVERAGE RISES BY 1. WHAT IS THE ORIGINAL AVERAGE.
*October 11, 2011*

**trig**

THE SIDE OF A RIGHT-ANGLED TRIANGLE ARE 3XCM,3X-1CM AND 4X PLUS 1CM ,THE LAST SIDE BEING THE HYPOTHENUS FIND X.
*October 11, 2011*

**chemistry 105**

Consider the following reaction: Li2S(aq)+Co(NO3)2(aq)-->2LiNO3(aq)+CoS(s) What volume of 0.150 M Li2S solution is required to completely react with 125 mL of 0.150 M Co(NO3)2?
*October 10, 2011*

**chemistry 105**

Sulfuric acid dissolves aluminum metal according to the following reaction: 2Al(s)+3H2SO4(aq)-->Al2(SO4)3(aq)+3H2(g) Suppose you wanted to dissolve an aluminum block with a mass of 14.7 g. What minimum mass of H2SO4(in g) would you need? What mass of H2 gas(in g) would be ...
*October 10, 2011*

**chemistry 105**

Complete and balance each of the following equations for gas-evolutions. Express answer as a chemical equation. Identify all the phases in your answer. HCl(aq)+K2SO3(aq)--> HCl(aq)+KHCO3(aq)--> HC2H3O2(aq)+NaHSO3(aq)--> (NH4)2SO4(aq)+KOH(aq)-->
*October 10, 2011*

**chemistry 105**

Complete and balance each of the following equations, some may have no reactions. NaNO3(aq)+KCl(aq)--> NaCl(aq)+Hg2(C2H3O2)2(aq)--> note that Hg(I)^+1 interacts with another Hg(I)^+1 ion to produce the cation Hg2^2+ (NH4)2SO4(aq)+CuCl2(aq)-->
*October 10, 2011*

**Chemistry 105**

Which of the following reactions are redox reactions? 1. Al(s)+3Ag^+(aq)-->Al^3+(aq)+3Ag(s) 2. SO3(g)+H2O(l)-->H2SO4(aq) 3. Ba(s)+Cl2(g)-->BaCl2(s) 4. Mg(s)+Br2(l)-->MgBr2(s)
*October 10, 2011*

**chemistry 105**

to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
*October 10, 2011*

**chemistry 105**

to what volume should you dilute 20 mL of a 10 M H2SO4 solution to obtain a 0.130 M H2SO4 solution?
*October 10, 2011*

**ap chem**

P4 + F2 = PF3 What mass of F2 is needed to produce 120 gm of PF3, if the reaction has 81.1 % yield?
*October 10, 2011*

**ARATMETICS**

THE ARITHMETIC PROGRESSION 2,5,8,11 AND 3,10,17,24... HAVE SOME COMMAN VALUES.WHAT IS THE LARGEST VALUE LESS THEN 500 THAT THEY HAVE IN COMMAN?
*October 6, 2011*

**Physics **

A puck of mass m = 1.10 kg slides in a circle of radius r = 24.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.00 kg by a cord through a hole in the table. What speed (in m/s) keeps the cylinder at rest?
*October 2, 2011*

**math**

isnt it greater than 50?
*September 28, 2011*

**math**

Chris travels for a certain length of time at 40 miles per hour and Donny travels for the same length of time at 60 miles per hour. what is the average speed?
*September 28, 2011*

**Science**

Why is 100g of water and 1000g of water the same density?
*September 27, 2011*

**earth**

Find the ratio of the gravitational attraction between (a)a man of mass 100 kg and a woman of mass 50 kg who is 10 meters away from him and (b) the attraction between the woman and the Earth.
*September 26, 2011*

**nursing**

How do decision theory, probability theory, inference, and generalization relate to data analysis?
*September 23, 2011*

**nursing**

How do mean, median, mode, and standard deviation differ from one another? Support your answers with specific examples
*September 22, 2011*

**nursing**

What is the nurse’s role in data collection, patient privacy, and ethical treatment of human subjects?
*September 22, 2011*

**Word Problem**

A UPS employee, Davis, packs and labels three types of packages: basic packages, business packages, and oversized packages. Business packages take a priority over basic packages, and oversized packages because those customers paid a premium to have guaranteed two-day delivery...
*September 12, 2011*

**Math**

Eggplants in Thailand are 1.24 baht per kilogram, where one dollar is worth 1.37 baht. What is the price of eggplants in dollars per pound?
*September 11, 2011*

**chemistry**

How many milliliters of 1.4 M HCl must be transfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of mL
*September 11, 2011*

**statistics**

MEAN=80,SD=10, S=8, N=25 E(M)= SE(M)=
*September 9, 2011*

**math**

I need help multiply these 3 factors. (x+3)(x-3)(x-2)
*September 3, 2011*

**chemistry**

If there are 2.0 grams in 1 meter of copper wire, how many centimeters would be needed to provide .28 grams of copper?
*September 2, 2011*

**math**

if sue delivers 126 papers in a week but she delivers twice as many on saturday and sunday then how many does she deliver on sunday
*August 25, 2011*

**MATH**

Find the area of the parallelogram with vertices at...? (-6,-4), (0,-4), (3,4), and (-3,4) A) 14 B) 48 C) 24 D) PLEASE HELP A.S.A.P., beggers can't be choosers but maybe an explanation?
*August 11, 2011*

**English**

This questions can be asking many different things so hopefully this it what you are wanting.... If you are wanting to know the type of sentence it is a simile. If you wanting to know which part of the sentence makes it "Rhetorical sentence" I am 99% sure it is: (The...
*August 11, 2011*

**math**

The sinusoid y=3cos(x+3)-2 has which of the following? a. phase shift of 3 to the right b. phase shift of 3 to the left c. vertical shift up of 2 d. horizontal stretch by factor of 3
*August 4, 2011*

**college algebra**

e^(-3-x)+22=0 e^(-3-x)=22 ln(e^(-3-x))=ln(22) -3-x=ln(22) -x=ln22+3 x=-(ln(22)+3) x=-6.091
*July 25, 2011*

**college algebra**

Horizontal asymptotes occur when the numerator is equal to 0, vertical when denominator is equal to 0 therefore, in this problem, both asymptotes are 0.
*July 25, 2011*

**Algebra**

The negative sign is misplaced, and must go before the 6x instead of the 5, making the correct factor: 7x(4x^2-6x+5)
*July 25, 2011*

**madical**

You’re reviewing reimbursement for a Medicare surgical craniotomy case. The case falls into a DRG1. Which has a relative weight of 3.0970 and a geometric mean length of stay of 6.3. The hospital’s current standard reimbursement rate is $1500. Calculate the DRG ...
*July 24, 2011*

**Calculus**

A stone is dropped from the edge of a roof, and hits the ground with a velocity of -145 feet per second. How high (in feet) is the roof
*July 22, 2011*

**Calculus**

The circumference of a sphere was measured to be 74.000 cm with a possible error of 0.50000 cm. Use linear approximation to estimate the maximum error in the calculated surface area
*July 20, 2011*

**GRAMMAR - MT**

Perforation of the tympantic membrane was beleived to be the cause of the patient's vertigoe and myringitis.
*July 16, 2011*

**math**

when you cross multiply how do you get 36y?
*July 10, 2011*

**Juvenile Delinquency**

Do people really change or do they stay the same but appear to be different because their life circumstances have changed?
*July 7, 2011*

**economics- free trade.**

What are the advantages and disadvantages of free trade?
*July 5, 2011*

**Algebra**

In a paragraph, describe how to simplify this expression ã100
*June 15, 2011*

**Physics**

A golf ball is given an initial speed of 20 m/s and returns to ground level. Which launch angle above level ground results in the ball traveling the greatest horizontal distance? Neglect friction. 1. 60 degrees 2. 45 3. 30 4. 15 The answer is 45 but I was wondering how to get ...
*June 15, 2011*

**Physics**

Also: Given that A+B+C=0, find the magnitudes of A and B.
*June 12, 2011*

**Physics**

Vector A points in the negative direction. Vector B points at an angle of 35.0 above the positive x axis. Vector has a magnitude of 10 and points in a direction 46.0 below the positive x axis.
*June 12, 2011*

**Algebra please help**

f(x)=1/3(x+7)^2+4 find the vertex,the line of symmetry, and the max or min. value of the f(x) graph the function. thank you in advance :)
*June 8, 2011*

**world geography**

What are the "many islands" people also called?
*June 5, 2011*

**probability and statistics I NEED HELP**

A six-sided die is rolled 20 times and a 5 is rolled 9 times. a) State a null and alternative hypothesis for the die being fair. b) Can the null hypothesis be rejected at the .01 significance level?
*May 31, 2011*

**Algebra**

w^4-6w^2-2=0 what is the solution?
*May 24, 2011*

**Algebra**

-7 and -4 the quadratic equation is? Thank you in advance :)
*May 24, 2011*

**Chemistry (PLEASE HELP)**

thanks, now do u know the units to this problem
*May 23, 2011*

**Chemistry (PLEASE HELP)**

How much energy (in joules) is contained in one mole of photons (electromagnetic quanta) of frequency 2.3E+19 Hz?
*May 23, 2011*

**algebra**

Write an algebraic expression for the following: If James spends 5/6 of his weekly allowance (x) on a movie, how much will James have left?
*May 23, 2011*

**Criminal justice**

why does the system require that everyone is entitled to a fair trail, even if the person is caught red-handed
*May 22, 2011*

**Chemistry-Help Please!**

@ 20 Celsius - 22g CuSO4 / 100g H2O @ 40 Celsius- 42g CuSO4 / 100g H2O Using this, answer whether these are saturated or unsaturated @ 40 Celsius is 5g CuSO4 / 10g H2O @ 40 Celsius is 99g CuSO4 / 250g H2) I was told that the first one is unsaturated and the second one is ...
*May 19, 2011*

**Chemistry**

Can anyone tell me if I am right on these? Calculate the amount of solute needed to make each of the solutions 225g of 10% (m/m) K2CO3 solution Answer: 22.5g K2CO3 0.50kg of 18% (m/m) KOH solution Answer: 90g KOH
*May 19, 2011*

**Chemistry**

@ 20 Celsius - 22g CuSO4 / 100g H2O @ 40 Celsius- 42g CuSO4 / 100g H2O Using this, answer whether these are saturated or unsaturated @ 40 Celsius is 5g CuSO4 / 10g H2O @ 40 Celsius is 99g CuSO4 / 250g H2) I was told that the first one is unsaturated and the second one is ...
*May 19, 2011*

**math**

i mean the balance after the interest is added is $960. how do i figure out the principle and the interest? The rate is 4% and the time is 5 years. Thanks!
*May 16, 2011*

**math**

No the balance not the principle. The principle and the interest are the two amounts we don't know. I know if you add the two together you get $960 but I can't figure out to get those two numbers.
*May 16, 2011*

**math**

it is a simple interest problem: the balance is $960, the rate is 4% and the length is 5 years -- what is the interest?
*May 16, 2011*

**CRT 205**

The following activity helps you sharpen your skills in recognizing deceptive reasoning. The statements below are derived from the viewpoints in this chapter. Beside each one, mark the letter of the type of deceptive appeal being used. More than one type of tactic may be ...
*May 15, 2011*

**thank you mathmate **

Thank you for your help
*May 14, 2011*

**Algebra**

what is the square root of 12x^3y^2
*May 14, 2011*

**vocab**

poverty, paintings, interests
*May 9, 2011*

**Chemistry**

This should be saturated When you divide 22g CuSO4 per 100 g H20 by 4. You get 5.5g of CuSO4 per 25g H2O. Does this help?
*May 4, 2011*

**chappell**

what is the lattice method for 2 times 46
*May 2, 2011*

**algebra **

a jeweler purchased 5 oz of a gold alloy and 20 oz of a silver alloy for a total cost of $540. The next day at the same price per ounce, the jeweler purchased 4 oz of th egold alloy and 25 oz of the silver alloy for a total cost of $450. Find the cost per ounce of the gold and...
*April 29, 2011*

**Chemistry**

I got 3.39%, correct? Thanks
*April 29, 2011*

**Chemistry**

A lab assistant prepared a potassium chloride solution for her class by dissolving 5.34 g of KCl in 152g of water. What is the mass percent of the solution she prepared? Could you help me set this up/show me how to do this problem?
*April 29, 2011*

**Probability**

Factories A and B produce computers. Factory A produces 2 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.012 and the probability that an item produced by factory B is defective is 0.04. A computer is selected at ...
*April 26, 2011*

**Math**

If a pro basketball player has a vertical leap of about 35 inches, what is his hang time? Use the hang-time function V = 48T²
*April 24, 2011*

**Chemistry**

Of helium and argon, which will have the higher boiling point and why?
*April 20, 2011*

**Spanish**

A mis amigas no ___ comer papas fritas.
*April 18, 2011*

**english - text commentary "Painful case" **

Hello, I'm french student and I must to make a text commentary and I need your help finding some idea to develop. It's an extract from "Painful case" by James Joyce Thank you! When he gained the crest of the Magazine Hill he halted and looked along the river ...
*April 12, 2011*

**social studies**

What are the pros and cons of textbook social studies learning?
*April 10, 2011*

**physics**

just kidding i figured it out.
*April 7, 2011*

**physics**

A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 25.0° and the angle of refraction is 14.0°, find the critical angle for the liquid when surrounded by air. im not sure how to start this problem.
*April 7, 2011*

**physics**

A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i really need help on this one. im completely stuck!
*April 6, 2011*

**physics**

A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i know that 1/f=1/do=1/di. when i put the numbers into the equation i keep getting 23.75 and its saying that its wrong. can you please ...
*April 6, 2011*

**social studies**

What are the pros and cons of textbook social studies learning?
*April 5, 2011*

**statistics**

Start with x = 100 and add four x values to make a sample of five data such that: a. s = 0 b. 0 < s < 1 c. 5 < s < 10 d. 20 < s < 30
*April 5, 2011*

**Calculus**

Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Any help would be greatly appreciated!!!
*April 4, 2011*

**Calculus II**

Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Thanks for the help!
*April 3, 2011*

**math**

12x^4 _______ 42x
*March 30, 2011*

**Algebra**

Choose the correct simplification of (3xy6)2(y3)3.
*March 20, 2011*

**physics**

A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h? (b) What is the efficiency of the motor? for (a) i am doing IV*hours*price and its ...
*March 14, 2011*