Friday

September 30, 2016
Total # Posts: 1,066

**chemistry**

calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 6, 2015*

**college**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. whats wrong 25 g NaCl 1.0 L solution 1.0 g/mL 25 g NaCl/58.44 g NaCl...

*January 5, 2015*

**college chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**science**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**ap chemistry**

tanks

*January 5, 2015*

**ap chemistry**

what else is right?

*January 5, 2015*

**ap chemistry**

its touluene

*January 5, 2015*

**ap chemistry**

what else is right help me

*January 5, 2015*

**ap chemistry**

is that right answer

*January 5, 2015*

**ap chemistry**

HELP ME WITH THIS ONE WHEN DONE WITH THE OTHER THX calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

*January 5, 2015*

**ap chemistry**

i figureed is this right DrBOb22 is my ansswers right mass percent: 43.359/152.6gx100= 28.4% mass of benzene: 25 mLx .874 g/mL= 109.25 grams mass of touluene: 50 mLx .867 g/mL= 43.35 grams molarity: .251 mol/.175 L= 1.43 M molality: .251 mol/ .10925 kg= 2.30 m x touluene= .470...

*January 5, 2015*

**ap chemistry**

need help

*January 5, 2015*

**ap chemistry**

is this right: mass percent: toluene 28.4 % benezene: 7.6% mole fraction x C6H5CH3: .251 mole fraction of X C6H6 1.619 molality: 2.3 molal molarity: 1.43 M is that right? idk

*January 5, 2015*

**ap chemistry**

mass of benzene is 0.874 g/ml mass of toluene= 0.867 g/mL

*January 5, 2015*

**ap chemistry**

i dont know how to do it

*January 5, 2015*

**ap chemistry**

but how u do it explain please

*January 5, 2015*

**ap chemistry**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**chemistry**

calculate the concentration of CO2, in a soft drink after the bottle is opened and equilibriates at 25C under a CO2 partial pressure of 0.0003 atm.

*January 5, 2015*

**chemistry**

a solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). assuming that the volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

*January 5, 2015*

**science**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

*January 5, 2015*

**ELA**

I'm reading the Iliad and a question has come up - What is the conflicting message about the relationship between humans and the gods does this myth give? Any help with this would be much appreciatd. Thank You

*January 5, 2015*

**AP Chemistry**

Consider the following reaction: CH3X + Y --> CH3Y + X At 25 degrees Celcius the following two experiments were run, yielding the following data: Experiment 1: [Y]0 = 3.0 M [CH3X] (mol/L) Time (hours) 7.08*10^-3 1.0 4.52*10^-3 1.5 2.23*10^-3 2.3 4.76*10^-4 4.0 8.44*10^-5 5....

*January 1, 2015*

**College Algebra**

According to Newton's law of cooling, the rate at which an object cools is directly proportional to the difference in temperature between the object and the surrounding medium. The face of a household iron cools from 130° to 100° in 30 minutes in a room that ...

*December 10, 2014*

**College Algebra **

The number of bacteria in a certain culture increased from 500 to 1000 between 7:00 A.M. and 9:00 A.M. Assuming growth is exponential, the number f(t) of bacteria t hours after 7:00 A.M. is given by f(t) = 500(2)^t/2. (a) Estimate the number of bacteria in the culture at 8:00 ...

*December 10, 2014*

**Math**

A length of rope is stretched between the top edge of a building and a stake in the ground. The head of the stake is at ground level. The rope also touches a tree that is growing halfway between the stake and the building. If the tree is 38 feet tall, how tall is the building...

*December 4, 2014*

**ELA**

Have been all over Google looking for laymans terms for this - coulden't find anything but thanks anyway

*December 2, 2014*

**ELA**

Athena asks Zeus "will you save a man whom the fates appoint to die?" How does this question relate to the overall theme in the iliad? SOOOOO CONFUSED Please help - Thank You

*December 2, 2014*

**Math**

A town has 4900 registered voters, each of whom is either a Republican, a Democrat or an Independent. In the last primary election, 1150 people voted, and the number of Republicans who voted was 720 fewer than 30% of the total number of Democrats plus Independents combined. ...

*November 30, 2014*

**physics**

The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the total force on a(n) 75 kg driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 66 m/s in 4.5 s? Answer in units of kN

*November 22, 2014*

**Math**

Thank You Very Much Derius.

*November 19, 2014*

**Math**

Everyday I practice the drums for the same length of time. By the end of the 15th week, I have practiced a total of 37 1/2 weekday hours. How many hours do I practice a day? I did 15 x 5 to get 75 days then divided by 37 1/2 hours to get how many hours per day am I doing this ...

*November 19, 2014*

**Math!**

Let h(x)=4-x. Use h, the table, and points on graph to evaluate the expression. x 2 3 4 5 6 f(x) −1 0 1 2 3 g(x) points (-1,1), (2,3), (3,5) (a) (g^−1 compose f^ −1)(2) (b) (g^−1 compose h)(1) (c) (h^−1 compose f compose g^-1)(3)

*November 19, 2014*

**College Algebra **

Ozone occurs at all levels of Earth's atmosphere. The density of ozone varies both seasonally and latitudinally. At a given city, the density D(h) of ozone (in 10^−3cm/km) for altitudes h between 20 kilometers and 35 kilometers was determined experimentally. For the ...

*November 12, 2014*

**College Algebra **

Find the standard equation of a parabola that has a vertical axis and satisfies the given conditions. x-intercepts −2 and 8,highest point has y-coordinate 5

*November 12, 2014*

**College Algebra **

An object is projected vertically upward from the top of a building with an initial velocity of 112 ft/sec. Its distance s(t) in feet above the ground after t seconds is given by the equation s(t) = −16t^2 + 112t + 100. (a) Find its maximum distance above the ground. s(t...

*November 12, 2014*

**Math**

How would you order the following from least to greatest? 1/4, 0.2, 3/8, 30% Would it be 0.2, 1/4, 30% and 3/8? This was my answer but it was marked wrong? Where did I go wrong? Thanks for your help

*November 10, 2014*

**College Math**

An object is projected vertically upward with an initial velocity of v0 ft/sec, and its distance s(t) in feet above the ground after t seconds is given by the formula s(t) = −16t^2 + v0t. (a) If the object hits the ground after 8 seconds, find its initial velocity v0. v0...

*November 10, 2014*

**Physics**

A plane is flying horizontally with speed 251 m/s at a height 2180 m above the ground, a package is thrown downward from the plane with a vertical speed v1 = 80 m/s. What is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on...

*November 7, 2014*

**Physics**

A block of mass m = 3.65 kg is attached to a spring (k = 27.5 N/m) by a rope that hangs over a pulley of mass M = 7.30 kg and radius R = 2.81 cm, as shown in the figure. a) Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and ...

*October 31, 2014*

**Physics**

I would really appreciate the help for this assignment. A small reasoning for the answer would be very helpful. Thank you. A sphere of mass m and radius r is attached to the rim of a disk (mass M, radius R). The disk is rotating counter-clockwise with a constant period T ...

*October 31, 2014*

**Math**

Sue bought an ice cream cone from Dairy Queen. The cone had a radius of 3cm and a height of 8cm. If I use the formula of (TT=3.14, r=radius, h=height) 2 V=1/3TTr h Is the answer 50.24 cm3? Any help is appreciated. If I'm not right could you tell/show me how to figure this ...

*October 27, 2014*

**Math**

Still not getting it - but if I were to guess I would probably pick D? I will go back to math is fun site and study some more! Thanks again, Kyle

*October 25, 2014*

**Math**

Oh My God! The expression is 2(n-6) So sorry Ms. Sue

*October 25, 2014*

**Math**

Which verbal expression represents the algebraic expression? (A) 2 times a number minus 6 (B) twice the difference between 6 and a number (C) 6 less than twice a number (D) twice the difference between a number and 6 I think it's A, am I right? Thank You for your help.

*October 25, 2014*

**Math**

Thanks for the site will go on it. Thanks again. Kyle

*October 24, 2014*

**Math**

Thank You Ms. Sue, I'll get the hang of this eventually!!!!!

*October 24, 2014*

**Math**

Yes, it's me again! How would you write the expression that represents the perimeter of a rectangle measuring 4 x - 4 + 7 x + 1 Would it be -4 + 1 = - 5

*October 24, 2014*

**Math**

I meant to say would it be 26 x + 12

*October 24, 2014*

**math**

Thank You

*October 24, 2014*

**math**

How would you write the expression that represents the perimeter of a rectangle measuring 9 x + 9 and 4 x - 3 Would it be 26 x + 2 Any help would be appreciated. Thank You

*October 24, 2014*

**Math**

Ah Yes! Thank You

*October 21, 2014*

**Math**

Am I right? Nobby Hobby charges $35.00 entry fee plus $18.50 per night of camping. Write an algerbraic expression for the cost in dollarsof entry to Nobby Hobby ($35.00+$18.50).n Thanks

*October 21, 2014*

**Quick math help**

faction in simple form

*October 15, 2014*

**physics**

Nevermind

*October 14, 2014*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...

*October 14, 2014*

**Math**

It is better to use fractions when it is on top of other fractions, for example 2/3+2/4 ----------- 2/5-2/6 Because then you can get a common demoninator and cancel For decimals I don't know pretty much everything else

*October 14, 2014*

**physics**

016 10.0 points One of the great dangers to mountain climbers is an avalanche, in which a large mass of snow and ice breaks loose and goes on an essentially frictionless “ride” down a mountainside on a cushion of compressed air. The acceleration of gravity is 9.8 m/...

*October 14, 2014*

**Math**

Did you type that in right?

*October 14, 2014*

**math**

Did you try distributing

*October 14, 2014*

**math**

6 is the largest common factor

*October 8, 2014*

**math**

i am so confused, can you teach me?

*October 8, 2014*

**math**

the factorization of 18 is 2x3x3, and the 60 is 2x2x3x5. so the question is asking the greatest so 3 is not correct? maybe 2?

*October 8, 2014*

**math**

Q2 answer is 3?

*October 8, 2014*

**math**

There are 18 boys and 60 girls working on a community service project. They work in groups where each group has the same number of boys and the same number of girls. Q1: What is the first step to finding the greatest number of groups possible? A. Multiply 18 times 60 B. Divide...

*October 8, 2014*

**Physics**

A 5.00×10^5-kg rocket is accelerating straight up. Its engines produce 1.250×10^7 N of thrust, and air resistance is 4.50×10^6 N. What is the rocket’s acceleration? I just need the formula for finding the acceleration.

*October 1, 2014*

**Math (LCM)**

A music store gives every 20th customer a $5 gift card. every 50th customer gets a $10 gift card. Which customer will be the first to receive both types of gift cards? Use prime factorizations.

*September 30, 2014*

**Physics**

A 103 kg sprinter wishes to accelerate from rest to a speed of 13.2 m/s in a distance of 19.3 m. What coefficient of static friction is required between the runners shoes and the track?

*September 29, 2014*

**Math**

3sqrt(5x-6) + 2sqrt(7-x) = 13

*September 24, 2014*

**Math**

A conical paper cup is to have a height of 3 inches. Find the radius r of the cone that will result in a surface area of 6ðin^2.

*September 24, 2014*

**Math**

Determine all values of k for which each pair of vectors is orthogonal. a) (1,2) and (k,k) b) (1,2,1) and (k,2k,4)

*September 24, 2014*

**math**

Determine all values of k for which each pair of vectors is orthogonal. a) (1,2) and (k,k) b) (1,2,1) and (k,2k,4)

*September 23, 2014*

**Algebra**

Logan saves $5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves.

*September 23, 2014*

**Math**

Find a unit vector in the direction of(1/2, 1/2, 1/2).

*September 23, 2014*

**Algebra**

x^3 + 6x^2 + 10x = 0

*September 19, 2014*

**Math**

The speed of the current in a stream is 4 mi/hr. It takes a canoeist 96 minutes longer to paddle 13 miles upstream than to paddle the same distance downstream. What is the canoeist's rate in still water?

*September 15, 2014*

**math**

given the domain of g(x) is (-3,5) and the range of g(x) (-10, 10) find the domain and range of the transformed function 4g(x-7)+12

*September 14, 2014*

**Math**

A pizza box with a square base is to be made from a rectangular sheet of cardboard by cutting six 1-inch squares from the corners and the middle sections and folding up the sides (see the figure). If the area of the base is to be 144 in^2, what size piece of cardboard should ...

*September 14, 2014*

**Physics**

While entering a freeway, a car accelerates from rest at a rate of 2.3 m/s2 for 12 s.How far does the car travel in those 12 s, in meters?

*September 14, 2014*

**math**

You are running a fuel economy study. one of the cars you find is blue. it can travel 35 1/2 miles on 1 1/4 of gasoline. Another car is red. It can travel 27 1/5 on 4/5 gallon of gasoline. What is the unit rate for miles per gallon for the blue car? what is for the red?

*September 10, 2014*

**Math**

(2x^3y^2z)-2/(3x^4yz^-2)^-2

*September 10, 2014*

**math**

A rectangular box is to have a square base and a volume of 30 ft3. The material for the base costs 33¢/ft2, the material for the sides costs 10¢/ft2, and the material for the top costs 24¢/ft2. Letting x denote the length of one side of the base, find a function...

*September 7, 2014*

**Math**

Simplify each expression. Write your answer using a postive exponent. 1.2^0 divided by 1.8 ^2

*September 2, 2014*

**english**

Just did this 1C 2A,D 3B 4B,D 5B,D 6C

*August 15, 2014*

**Math**

Which inequality is correct? A. ^11 <^22 < 11 B. 11 < ^11 < ^22 C. ^11 < 11 < ^22 D. ^22 < ^11 < 11 My answer is c is that correct

*August 14, 2014*

**geometry**

What is the distance between (-4,3)and (5,-2)

*July 16, 2014*

**geometry**

which set of ordered pairs has point symmetry with respect to the origin (0,0) 1- (-12,5), (-5,12) 2- (-12,5), (12,-5) 3- (-12,5), (-12,-5) 4- (-12,5), (12,5)

*July 16, 2014*

**math**

Which of the following is a negation of the statement below? All cats are not mammals. All mammals are not cats. All cats are mammals. Some cats are mammals. All mammals are cats.

*July 16, 2014*

**math**

theres two that are right I got the one just not the other can you please help

*July 16, 2014*

**math**

Which statements about a rhombus are always true? Its diagonals are congruent. All angles are congruent. All sides are congruent. Its diagonals are Û to each other.

*July 16, 2014*

**math**

so never

*July 16, 2014*

**math**

always

*July 16, 2014*

**math**

Determine if the statement is always, sometimes, or never true: A right triangle is an obtuse triangle. always sometimes never

*July 16, 2014*

**math**

The altitude of an equilateral triangle is 6 square 3 units long. The length of one side of the triangle is ____ units.

*July 14, 2014*

**math**

Find the coordinates of the midpoint of the segment whose endpoints are given. W (-3, -7) and X (-8, -4)

*July 14, 2014*

**math**

If the equation of a circle is (x + 5)2 + (y - 7)2 = 36, its center point is

*July 10, 2014*