Sunday
December 4, 2016

# Posts by Jack

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
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

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
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
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

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