Total # Posts: 1,932
Well look at the value given a negative enthalpy means that energy was absorbed while a positive enthalpy means that energy was released take a look at Hess' law Enthalpy of products - Enthalpy of reactants = -212 kJ If it's negative then that means the products are at...
October 29, 2014
Your electric drill rotates initially at 5.11 rad/s. You slide the speed control and cause the drill to undergo constant angular acceleration of 0.363 rad/s^2 for 4.13 s. What is the drill's angular displacement during that time interval? ______ rad
October 28, 2014
I need to know how to journalize this in a General Journal, but I don't know if it is required to even write down. Signed a lease agreement to rent office space for $975 per month, beginning Feb 1st. Nothing was paid today. (This happened on Jan 15)
October 23, 2014
How can you identify the difference between an plant and animal cell. What structures (you should have at least 2) should you look for in each in order to tell the difference?
October 20, 2014
A soccer player extends her lower leg in a kicking motion by exerting a force with the muscle above the knee in the front of her leg. Suppose she produces an angular acceleration of 28.5 rad/s2 and her lower leg has a moment of inertia of 0.7 kg⋅m2. What is the force, in...
October 19, 2014
Hi, I need help finding the domain and range of the Quadratic Model on part b. I've included part a. just in case you may need it. a.The parabolic path of a thrown ball can be modeled by the table. the top of the wall is at (5,6). Will the ball go over the wall? If not,...
October 15, 2014
Two spheres A and B of mass 6.0 kg and 7.3 kg respectively are separated by a distance of 0.65 m. (a) Calculate the magnitude of the gravitational force A exerts on B and B exerts on A.
October 15, 2014
Please help me! I do not know what to do. 500.0 g ethyl alcohol at 25°C (C = 2.46 J/g x °C) absorbs 74.0 J of heat energy. What is the final temperature? What is the specific heat constant if 621 g of Metal A raises the temperature of 500.0 g of water by 3.20°C and...
September 25, 2014
A football is thrown with an initial upward velocity component of 15.0m/s and a horizontal velocity component of 17.0m/s . a:How much time is required for the football to reach the highest point in its trajectory? b:How high does it get above the ground? c:How much time after ...
September 22, 2014
I done the problem and was wondering if my answer is right I got 1.87 and then 12.4 degrees above x axis please help At time t = 0 s, a puck is sliding on a horizontal table with a velocity 4.60 m/s, 32.0° above the +x axis. As the puck slides, a constant acceleration acts...
September 14, 2014
1. Which of the following sources is least likely to have been edited for accuracy? (1 point) a city newspaper a personal Web site an encyclopedia article a published book 2. Which of the following is NOT true about bias? (1 point) Using both biased and non-biased resources in...
August 15, 2014
1. All of the following define the theme of a story EXCEPT (1 point) the central idea of a work the underlying message in literature the methods of characterization employed by the writer the lesson, or moral, of the story which can be inferred by readers 2. Which of the ...
August 15, 2014
1. In At the Tourist Centre in Boston, the speaker's tone can best be identified as (1 point) disapproving. downcast. enraged. sarcastic. 2. Which line from the poem best supports the tone identified above? (1 point) "the green of the trees dulled;" &...
August 15, 2014
1. "Similarly", "on the other hand", and "however" are signals that the author of a source is using which of the following text structures? (1 point) sequencing comparison and contrast cause and effect problem and solution check my work my answer ...
August 14, 2014
4. In both the Gettysburg Address and Letter from Birmingham Jail, the writers (1 point) comment on the tribulations faced by a nation at war. honor those who have fought for freedom. demand the revision of the nations unjust laws. expound on the notion of ...
August 13, 2014
What is the maximum mass of S8 in grams that can be produced by combining 87.1 g of each reagent? Do not include units in your answer. Answer to three significant figures. 8SO2 + 16H2S → 3S8 + 16H2O
August 1, 2014
While picking up passengers in a big city, a taxi driver drives 20.0 blocks south, then 15.0 blocks east, and then 6.0 more blocks south. What is the magnitude of the taxis resultant displacement? Iv'e been using the equation sqrt(x^2+y^2+z^2) THe answer I get is 25....
July 28, 2014
a drug is supplied as a 20 mg/ml solution in a 50 ml vial. you need to make 15 ml of a 10 mg/ml solution. how much concentrate and how much diluent are needed to obtain the desired final volume?
July 9, 2014
A year ago, the Alpine Growth Fund was being quoted at an NAV of $21.50 and an offer price of $23.35; today, its being quoted at $23.04 (NAV) and $25.04 (offer). Use the approximate yield formula or a handheld financial calculator to find the rate of return on this load ...
June 23, 2014
An investor in the 28% tax bracket is trying to decide which of two bonds to select: one is a 5.5% U.S. Treasury bond selling at par; the other is a municipal bond with a 4.25% coupon, which is also selling at par. Which of these two bonds should the investor select? Why?
June 22, 2014
In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x ...
May 11, 2014
I haven't had a chance to meet with my Spanish professor about my composition and I need to turn it in soon. It's basically just a short past narration (15 sentences) using only the preterite and imperfect. If someone could read through it and let me know what things I...
May 3, 2014
I can't seem to figure out the name of this organic molecule. I know it's an amine, but that's it. There are two methyls (CH3) attached to a CH, followed by (in order) NH, CH2, CH2, CH2, and CH3. (ignore the ^^^, I had to use them so the atoms would line up...
April 9, 2014
My "picture" of the molecule didn't work. Hopefully, this will work better (~ represents a triple bond and ignore the ```) ````````CH3 ````````CH2 HC ~ C - C - CH2 - CH3 ````````CH2 ````````CH3
April 9, 2014
I'm having trouble naming this organic chemistry compound. (I'm not sure how to include a picture in this, so I'll try my best to explain it in words and attempt to type it out) The full formula is C9H16. It's an alkyne and the longest carbon chain is 5 carbons...
April 9, 2014
Earthquakes are essentially sound wavescalled seismic wavestraveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called...
April 7, 2014
"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- = -1.23 Possible reduction ...
April 2, 2014
#1 Is C. Industry. #3 It's not D. In the study guide it says to prepare the introduction and overview last. It's not B. I used that in my test and it was wrong. I'm stuck between C and A. I don't know 2 or 4.
February 11, 2014
guess my rule with two rules. Having such as hard time understanding this and would like to be able to explain to my 2nd grader! home wor sheet has 2 circles joined togeather, rule A has 2 girls in it with glasses, in the middle there is another girl with glasses, in rule B ...
February 4, 2014
A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 2.0 m/s. Determine the amplitude A of the motion.
January 25, 2014
Chemistry Check Please! ?Fixed
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.548 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 17, 2014
Chemistry Check Please!
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0....
January 16, 2014
Chemisty Check Please!
B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11= 3.44g/342.3(g/mol)=0.10049 mol 6.5556 mol/(6.5556 mol + 0.10049 mol= 0.984902 mol A) M= (0.10049)/(0.00344 kg + 0.118 kg)= 0.82749 m c12h22O11
January 14, 2014
A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?
January 14, 2014
There were 10 more boys than girls at an outing. Each boy was given 3 sweets and each girl was given 4 sweets. A total of 156 sweets were given to the children. How many girls were there at the outing?
January 1, 2014
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 5 sin^2(x)- 21 sin(x)+ 4 =0
November 27, 2013
A spotlight on the ground is shining on a wall 12m away. If a woman 2m tall walks from the spotlight toward the building at a speed of 0.6m/s, how fast is the length of her shadow on the building decreasing when she is 2m from the building?
October 30, 2013
If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2
October 29, 2013