Sunday

December 4, 2016
Total # Posts: 1,689

**Chemistry Stoichiometry**

I wasn't in class when my teacher taught me this, and she did not go over the material well, so how were you able to go from PV=nRT to M=dRT/P?

*June 27, 2015*

**Chemistry Stoichiometry**

The density of chloroform at a pressure of 220 mmHg and 25 degrees celsius is 1.42 g/L. Calculate the molar mass of chloroform. My set up is: mol*K .289 atm 1 1.42g/L ------------- ------------ ------ --------- .08206Latm 1 298K What I am unsure of is if this is the right way ...

*June 27, 2015*

**Chemisty**

How does the kinetic molecular theory help explain the difference between solids, liquids, and gases? Would the answer be basically stating how the theory states the difference of their atom structure? Or is it something else?

*June 27, 2015*

**Calculus**

Let f : R --> R be an odd function. Explain why, for any positive number a, the integral from -a to a of f(x) = 0.

*May 19, 2015*

**Chemistry**

yes that's what he was asking, thank you!

*May 14, 2015*

**Chemistry**

Consider the combustion of ethane: 2C2H6(g)+7O2(g)-->4CO2(g)+6H2O(g) If the ethane is burning at the rate of 0.7 mol/L × s, at what rates are and being produced?

*May 14, 2015*

**Chemistry**

The thiosulfate ion (S2O32-) is oxidized by iodine as follows: 2S2O32-(aq) + I2(aq) → S4O62-(aq) + 2I-(aq) In a certain experiment, 4.41×10-3 mol/L of S2O32- is consumed in the first 11.0 seconds of the reaction. Calculate the rate of production of iodide ion in ...

*May 14, 2015*

**Chemistry**

Which has the highest, second highest, third highest, and lowest boiling points? 1.0.20 m MnSO4 2.9.6E-2 m Al2(SO4)3 3.8.4E-2 m Al2(SO4)3 4. 0.45 m Sucrose(nonelectrolyte) [I know it is m times i but not sure how to get "i"]

*May 13, 2015*

**IT/235 - IMAGE EDITING AND IMPLEMENTATION**

If done in-house, what equipment would be required and what costs would be incurred? How would the photography affect the day-to-day store operations under each model?

*May 11, 2015*

**Chemistry**

A solution is made by dissolving 26.7 g urea, a nonelectrolyte, in 301 g water. (The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.) Calculate the vapor pressure of this solution at 25°C.

*May 6, 2015*

**Algebra**

What the minimum of y=2x^2-7x-2? How do you find it?

*April 21, 2015*

**maths, functions**

The demand in units per week for a given product as a function of its price, p, in dollars is given as D(p) = 1100 Ð 200p, the supply of the same product in units per week as a function of its price, p, in dollars is given as S(p) = 100p Ð 100. The market clearing ...

*April 21, 2015*

**operation managment**

Garden Variety Flower shop uses 625 clay pots a month. The pots are purchased at $2 each. Annual carrying costs per pot are estimated to be 15 percent of cost, and ordering costs are $125 per order. The manager has been using an order size of 1,500 flower pots. There are 4 ...

*April 16, 2015*

**Calculus**

a) The value of a computer after t years after purchase is v(t) = 1000e^(-0.45t). At what rate is the computer's value falling after 5 years? b) Assume that the total revenue received from the sale of x items is given by R(x) = 32 ln (5x+3), while the total cost to produce...

*April 13, 2015*

**algebra **

Solve: 2a-3/a+1 = 3a-5/a+3

*April 11, 2015*

**math**

Ms. Sue! Can you please help me?

*April 9, 2015*

**math**

Boris has a coin and a number cube. The number cube is labeled 1-6. He flips the coin once and rolls the number cube once. What is the probability that the coin lands tails up and the cube lands on a even number? A. 2/3 B. 1/4 C. 1/12 D. 1/6 How do i solve this problem? I'...

*April 9, 2015*

**social studies**

I need help with the same question...

*April 7, 2015*

**geometry.**

Theres no numbers given to answer this question.

*April 6, 2015*

**Math**

Wells uf you think and do the math you Will get 3 Lbs and 6 Oz

*April 2, 2015*

**This is nothing to do with school **

A cinema sells adult tickets and child tickets. The total cost of 3 adults and 1 child is £30 The total cost of 1 adult and 3 children is £22 What is the cost of adult and child tickets

*March 31, 2015*

**6 grade math**

Choose all statements that are not true. a 20% of 20 is 4 b 30% of 30 is 9 c 40% of 50 is 15 d 50% of 110 is 60 e 60% of 60 is 360 The answer I choose is all of them. Is this correct.

*March 26, 2015*

**Math**

Choose all statements that are true? a 15% of 15 is 1 b 5% of 50 is 10 c 10% of 100 is 10 d 2% of 100 is 5 e 3 % of 200 is 6 I picked a, c and e.

*March 26, 2015*

**math**

2 lines are given by kx+6y-5=0 and 3x+2y+4=0 if they are parrallel what is the value of k

*March 22, 2015*

**Algebra**

If an angle, x, is in standard position, and P(-3, 4) is a point on the terminal side of the angle, what is the value of sin x?

*March 15, 2015*

**chemistry**

H2(g)+ o2(g)-> H20(l) (delta)Hf(h20(l)=-286 kj/mol the total volume of hydrogen needed fill the hindenberg was 2.3 x 15^5 m^3. what is the theoretical yield of heat (that which could have been evolved) when the hindenberg exploded, assuming all the hydrogen reacted?

*March 15, 2015*

**chemistry**

Hey DrBoB222 I was wondering if you could help me with that problem just a little bit ago again?

*March 14, 2015*

**earth**

Water

*March 14, 2015*

**trig**

The height should be somewhere around 4.5

*March 13, 2015*

**trig**

In this problem use Sin functions to solve. Sin(90) / 5 and set that equal to... Sin(65) / x and see what you come up with

*March 13, 2015*

**chemistry**

I would love help on trying to start this problem?

*March 13, 2015*

**chemistry**

okay thank you very much for helping me and everyone else that asks questions on here I think you did a really good job answering my questions and I will keep what you said about the molar mass and the atomic masses in mind for next time. Again I can't thank you enough.

*March 13, 2015*

**chemistry**

Is that the correct answers?

*March 13, 2015*

**chemistry**

okay I think I got, I got 7.1 x 10^-7 for part a, and I got for part b that they should be the same, and for part c I got 3.7 x 10^4, and finally for part d I got since 1.1 x 10^-8 is greater than 5.0 x 10^-13 a precip will form.

*March 13, 2015*

**chemistry**

so in the ICE box when you are solving for "x" am I supposed to use the Ksp for the solid

*March 13, 2015*

**chemistry**

Okay thank you

*March 13, 2015*

**chemistry**

I don't understand how to set it up and get started on the problem and this is a problem that our teacher gave us for practice for the AP Chem exam

*March 13, 2015*

**chemistry**

Several reactions are carried out using AgBr, a cream-colored silver salt for which the value of the solubility product constant, Ksp, is 5.0 x 10-13 at 298 K. a) Calculate the value of [Ag+] in 50.0 mL of a saturated solution of AgBr at 298 K. b) A 50.0 mL sample of distilled...

*March 13, 2015*

**Science**

A is right

*March 7, 2015*

**math**

If Someone estimatesthat their book bag weighs 8.5 pounds and actually weighs 11 pounds what is the percentage error

*March 5, 2015*

**Science**

It was c wasn't it

*March 5, 2015*

**math**

-230 this is because any numbers absolute value is that number with nothing els so a negitive is not a negitive it is positive and a positive is still positive

*March 5, 2015*

**biochemistry**

How to prepare 2L of 5.5M HCL solutions from scratch

*March 4, 2015*

**math**

First of all, lets note what the formula is. A=bh or lw 25 is the width so lets plug it in. 25w=150+175t Next, you evaluate that by Isolating the "w". Divide the 25 by 25 and divide 150+175t to get 6+7t Get rekt noob........

*March 3, 2015*

**Social Studies**

The people of Brazil can best be decribed as A Primarily indigenous in descent B largely of the white European ancestry C mestizos with shared-indigenous heritages <--- c is my answer D mixed race with native, African, and European roots.

*February 28, 2015*

**Social Studies**

The people of Brazil can best be decribed as A Primarily indigenous in descent B largely of the white European ancestry C mestizos with shared-indigenous heritages <--- c is my answer D mixed race with native, African, and European roots.

*February 28, 2015*

**biology**

hi, I am studying for an exam and I am trying to really understand the processes of things. So, in a cardiac muscle (everything else normal) what would happen if sympathetic stimulation does not lead to the phosphorylation of Troponin-I? I am asking specifically in regards to ...

*February 27, 2015*

**chemistry**

PLZ help me understand the way of solving this equation quick A 0.07 mol sample of octane C8H18 absorbed 3.5*10^3 j of energy. calculate the temperature increase of octane if the molar heat capacity of octane is 254.0 j/k*mol

*February 21, 2015*

**biology**

I need help on the following: Imagine that a motor unit, with its nerve intact, is placed in a solution that is calcium-free (but has the proper ionic strength – don’t worry how). Further imagine that the ends of the muscle fibers in the motor unit are held such that...

*February 13, 2015*

**social studies**

What are some advantages and disadvantages of a reorganized family

*February 11, 2015*

**Icp**

A student is helping her teacher move a 9.5 kg box of books. What net sideways force must she exert on the box to slide it across the floor so that it accelerates at 1.0 m/s2?

*February 11, 2015*

**Physics**

A bowling ball of mass 3.5 kg moves in a straight line at 4.48 m/s. How fast must a Ping-Pong ball of mass 3.456 g move in a straight line so that the two balls have the same momentum? Answer in units of m/s.

*February 6, 2015*

**physics**

A wheel has a rotational velocity of 18·rad/s counterclockwise. You place you hand against the wheel and the friction between your hand and the rim stops it. (a) If it takes 4·s to stop the wheel, what is its rotational acceleration? rad/s2 (b) How far does the ...

*February 6, 2015*

**Socials Studies **

what did the monarch who replaced napoleon in 1813 want to revive how did it affect the people of france

*January 20, 2015*

**Socials Studies **

What was the outcome of the five year war between France and Spain and What country did Spanish troops ally with to fight napoleon's grand armee?

*January 20, 2015*

**physics**

A ball is thrown straight up and reaches a maximum height of 6.57 m . What was its initial speed? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m/s

*January 15, 2015*

**physics**

A 25.7 kg mass attached to a spring scale rests on a smooth, horizontal surface. The spring scale, attached to the front end of a boxcar, reads T = 47.6 N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, ...

*January 15, 2015*

**math**

Karen collects local and foreign coins. Of the coins in her collection, 1 4 are foreign coins. Of the foreign coins, 2 5 are from Mexico. What fraction of the collection are foreign coins that are not from Mexico?

*January 12, 2015*

**Socials Studies **

Toussaint Louverture was immortalized in sonnet by the British poet Wordsworth

*January 12, 2015*

**chemistry**

What volume of 1.34 mol/L hydrochloric acid, HCI, is expected to react completely with 6.89 g of calcium?

*January 12, 2015*

**Math**

Eighty metres of fencing are available to enclose a rectangular area. What are the dimensions that enclose the max area. What is max area?

*January 2, 2015*

**math**

why do you always mind this person's business ms.sue?

*December 26, 2014*

**Physics**

A 2.13 kg mass is suspended from a string which is pulled upward. The mass accelerates upwards with an acceleration of 3.10m/s2. What is the tension in the string?

*December 16, 2014*

**Physics**

A 1250 kg car traveling at 20 m/s suddenly runs out of gas while approaching the valley shown in the figure below. What will be the car's speed as it coasts into the gas station on the other side of the valley? (Assume that no energy is loss to friction.) file://dd-s-1/...

*December 10, 2014*

**Physics**

A weight of 690 N is held by two cables. The left-hand cable had tension T2 and makes an angle of 41◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 42◦ with the ceiling. What is the tension in the cable labeled T1 slanted at an angle ...

*December 8, 2014*

**english**

Lennie thinks Crooks is trying to scare him and gets becomes defensive saying "George will come back"

*December 8, 2014*

**physics**

A ball player hits a home run, and the baseball just clears a wall 17.6 m high located 122.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.1 m above the ground. (a) What is...

*November 24, 2014*

**Physics**

A 0.118 kg baseball traveling with a horizontal speed of 3.14 m/s is hit by a bat and then moves with a speed of 33.7 m/s in the opposite direction. What is the magnitude of the change in the ball's momentum?

*November 23, 2014*

**math**

Two sides of a rectangular fence are 5 5/8 feet long The other two sides are 6 1/4 feet long. what is the perimeter

*November 23, 2014*

**Math Help!**

2/3(k+8)=52

*November 19, 2014*

**math**

What is the GCF of 8 and 24? What is the LCM of 8 and 24?Write the sum of 8 + 24 as the product of its GCF and another sum.

*November 16, 2014*

**Physics**

Mary if riding her bike at a constant velocity of 10.2m/s. Suddenly someone jumps in front of her, 6 meters ahead of her. The coefficient of friction is 0.35, and her total mass is 130kg. She slams the breaks with 800N of force. Will she be able to stop in time? I heard that ...

*November 13, 2014*

**L.A.Help!!!!!!**

the answers for the whole quiz is 1. c 2. d. 3. b

*November 13, 2014*

**EDTECH**

UNIT 4 lesson 4 All of this information is part of a ___ in a database. a. record b. row c. column d. field What other information do you need to add to complete the database above? a. cell fill color b. fields c. field names d. borders

*November 13, 2014*

**science**

What would you need to know to determine the total amount of photosynthesis going on in the canopy and near the forest floor? Why?

*November 7, 2014*

**language arts**

according to harriet tubman, what was thomas garrett's role in the underground railroad

*November 6, 2014*

**Algebra**

Angle A is three times the measure of angle B. The sum of their measures is 128 degrees. Angle B is (x + 2) degrees. Find the value of x.

*October 30, 2014*

**science**

which of the following is true about the magnetic field diagram below

*October 27, 2014*

**English**

i hope that helps

*October 26, 2014*

**English**

somebody help i am new's answers are correct i got them all right

*October 26, 2014*

**math**

the product of my digits is an even number the sum of my digits is < 100

*October 20, 2014*

**statistics**

VGFIHTRNHKJ

*October 20, 2014*

**Biology**

For yogurt, draw a representative molecule of amino acids it contains.

*October 20, 2014*

**Biology**

Yogurt contains fats, cholesterols, carbohydrates(fibre, sugar and starch) and protein. For each of the nutrients that this food contains: Explain how the molecule's structure fits it function?

*October 20, 2014*

**Science**

I AM A CHEESE PIE

*October 15, 2014*

**Physics**

An apple falls from a tree and hits the ground 8.83 m below. With what speed will it hit the ground? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s

*October 9, 2014*

**Science**

WTF does that mean, I would agree you said, yes or no,?

*October 7, 2014*

**Trigonometry**

158

*October 1, 2014*

**Materials Science**

can you share the source of this question?

*October 1, 2014*

**physics**

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 19.0m/s when the hand is 1.50m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

*September 26, 2014*

**Algebra 1**

A student reads an average of 34 pages per day. The number of pages she reads per day varies from the average by up to 8 pages. a. Write an absolute value inequality that represents the range of the number of pages she reads per day. b. Solve your inequality

*September 25, 2014*

**Algebra**

In a sports poll, 53% of those surveyed believe their high school football team will win the state championship. The poll shows a margin of error of +-5 percentage points. Write and solve an absolute value inequality to find the least and the greatest percent of people that ...

*September 25, 2014*

**Algebra 1**

EXCELLENT. Thanks much.

*September 25, 2014*

**Algebra 1**

In order to earn an A in a class, your test scores must average at least 92%. On the first 6 tests, you have an average of 91%. What score do you need to get on the last test to earn an A? Show your work.

*September 25, 2014*

**Algebra 1**

Sorry but how do you know to include 80 and 90. Just cannot understand that part. Thanks much.

*September 25, 2014*

**Algebra 1**

Can you PLEASE elaborate ?

*September 25, 2014*

**Algebra 1**

I think you are saying option c. But real answer is d. Not sure why.

*September 25, 2014*

**Algebra 1**

A teacher knows that 80% of her students will score no more than 5 points above or below the class average, 85%, on the test. Which inequality represents the test scores of 80% of her students? a. 75<A<85 b. 85<=A<=90 c. 80<A<90 d. 80<=A<=90

*September 25, 2014*

**science**

I think it's pronounced You're

*September 24, 2014*