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college
Here are heart rates for a sample of 30 students before and after a class break. At α = .05, was there a significant difference in the mean heart rate? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic. (d) Make a decision. (...
Saturday, October 23, 2010 at 4:16pm
college
HIO3 + FeI2 + HCl --> FeCl3 + ICl (in acidic solution) Show and label the two balanced half-reactions (oxidation and reduction). Add H2Os, H+s or OH-s as needed.
Saturday, October 23, 2010 at 3:15pm
college
describe why it is important to consider each domain in the study of Adult Development?
Saturday, October 23, 2010 at 1:14pm
College Chemistry- Hess's Law
Nitrogen oxides undergo many interesting reactions in the environment and in industry. Given the following information, calculate H for the overall equation: 2 NO2(g) + 1/2 O2(g) = N2O5(s). 2 NO(g) + 3/2 O2(g) = N2O5(s), H = -223.7 kJ NO(g) + 1/2 O2(g) = NO2(g), H = -57.1 kJ
Friday, October 22, 2010 at 8:43pm
college
I purchased a $1,000 five percent coupon bond that matures in 10 years. How much would my bond be worth if interest rates fall to 4% the day after I purchase the bond? What would the bond be worth in one year if interest rates fell to 4% at that point?
Friday, October 22, 2010 at 6:17pm
College Physics
A car (mass 880 kg) is traveling with a speed of 44 mi/h. A bug (mass 7.9 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 43 mi/h)?. Additional: I know its a ...
Friday, October 22, 2010 at 5:58pm
College - Chemistry
Given that delta Hrxn for OH- ions is -22.9 kJ/mol, calculate the enthalpy of neutralization when I mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25-degrees C.
Friday, October 22, 2010 at 3:17pm
Statistics
The standard deviation of GPAs (grade point averages) of all male students at a college is .35 and the standard deviation of GPAs of all female students at the same college is .34. Suppose we take one sample of 40 male students and another sample of 50 female students from ...
Friday, October 22, 2010 at 3:11pm
College Physics
A freely rotating merry-go-round on a playground has a moment of inertia of 312 kgm2 and a radius of R=2.5 m. It is rotating with ω0=2.8 rad/s when a kid of mass 45 kg is standing on its outer rim. Neglecting friction, what is going to be the angular velocity of the merry...
Friday, October 22, 2010 at 12:43pm
College Algebra
I could not figure out the answer to this Problem: The quadratic function f(x)= -2x^2 =4x +3 can be used to solve the following inequality: -2x^2 -4x < -3 First use the Quadratic Formula to find the x-intercept of f. This problem asks that the answer be seperated by commas ...
Friday, October 22, 2010 at 5:57am
College Chemistry
What is pH of the buffer 0.1 mol L-1 Na2HPO4/0.15 mol L-1 KH2PO4? (Given Ka(H2PO4-)=6.2x10 power-8). Sorry if the power is confusing. My computer does not have the symbol. Thanks
Friday, October 22, 2010 at 1:19am
College Chemistry
What is pH of an aqueous solution formed by adding 20 mL of 0.1 mol L-1 NaOH to 30 mL of 0.2 mol L-1 HCI? Please show steps and maths. Is there a unit conversion if so how is this done. Thank you
Friday, October 22, 2010 at 1:06am
College Chemistry
Calculate pH of a 1.0 mol L -1 boric acid solution. (Ka(H3BO3) = 5.8 x 10 power -10 Please solve this problem. My computer does not have the power symbol. Can you please show maths and steps. Is mollar mass required of the above. Is -log and constant above used. Thanks
Friday, October 22, 2010 at 1:01am
College Chemisty
The pH of water collected in a stormwater run-off downstream from a Union Carbide chemical factory is 4.82. Calculate the H+ ion concentration of rainwater. The problem may start with: pH= -log H+ = 4.82. The answer is 1.5x10 power -5. Again, Can you please show steps for maths.
Friday, October 22, 2010 at 12:41am
College Chemistry
A student weighs out 0.568 g of KHP (molar mass=204g/mol) and titrates to the equivalence point with (36.78 cm cubed which is 3) of a stock NaOH solution. What is concentration of stock NaOH solution? KHP is an acid with one acidic proton. The word cubed is in word form ...
Friday, October 22, 2010 at 12:05am
college Chemistry
Hydrobromic acid is a strong acid. If you have 1 L of a 7.5 M solution of Hydrbromic acid? A) What is the concentration of H_3O^+? B) What is the PH of this solution? C) If you dilute 1 liter of 7.5M in HBR solution to a volume of 2 L what is the new concentration?
Thursday, October 21, 2010 at 6:34pm
Business-College
Can someone please help me understand what the best way would be to explain the possible benefits of using a network strategy to streamline operational procedures within a company which is working on its operational-management processes?
Thursday, October 21, 2010 at 5:37pm
College Algebra
I REALLY don't understand the reason/basis/use of logarithms. I have listened to my teacher, who never is clear on much of anything (it would help if he spoke better English), and a more advanced student, who couldn't explain them to me. The problem I am working on is...
Thursday, October 21, 2010 at 10:54am
college
During the job analysis process, the primary purpoe of haveing workers review and modify data collected about their current positions is to
Thursday, October 21, 2010 at 8:37am
College Chemistry
Which is the correct form of equilibrium expression of the following reaction. 2PbS(s)+3O2(g)reverse arrow 2PbOs + 2SO2g Why is the answer Kc= SO2 power 2/O2 power 3 Why in particular is this the arrangement for equilibrium expression? Thank you
Thursday, October 21, 2010 at 4:15am
College Chemistry
If 10.6 mol of carbon monoxide is produced how many grams of carbon were used? How do you convert moles to grams? And what are the steps please for the answer.
Thursday, October 21, 2010 at 4:08am
College Organic Chemistry
Why are fractionating towers in a refinery always tall?
Thursday, October 21, 2010 at 2:21am
College Organic Chemistry
Suggest what would be the result if we heated a mixture of dichloromethane and naphthalene to 60 degrees Celcius, collected distillate until no further material distilled, and then cooled the flask back to room temperature.
Thursday, October 21, 2010 at 2:19am
Stat College
what proportion of a normaql distribution is located between each of the following z- score boundaries? a. z= -0.50 and z = +0.50 b. z= - 0.90 and z= +0.90 c. z= -1.50 and z= +1.50 How will I know the question has been answered
Wednesday, October 20, 2010 at 11:22pm
College Chemisty
Given following reduction potentials in solution. Which is weakest oxidising agent in the list. List of numbers on right is for Eo/V. Al3+(aq)+3e- = Al(s) -1.66 Sn4+(aq)+2e- = Sn2+(aq) +0.14 Is(s)+2e-=21-(aq) +0.53 Why is a certain substance weakest? Is it -1.66 because this ...
Wednesday, October 20, 2010 at 10:51pm
College Chemistry
What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4? KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the correct formula, steps for the answer Thank you
Wednesday, October 20, 2010 at 10:43pm
college English
What can I write about for an event from my life. I need something that I can write a lot about and would be interesting to my classmates
Wednesday, October 20, 2010 at 6:02pm
College Chemistry
1. What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it? 2. A 30.5 g sample of an alloy at 94.0°C is placed into 48.7 g water at 20.3°C in an insulated coffee cup. The heat ...
Wednesday, October 20, 2010 at 6:00pm
College Physics
A coil has a horizontal axis. Its current goes North on top. What is the direction of the magnetic field inside this coil?
Wednesday, October 20, 2010 at 3:27pm
Chemistry - College
The fuel value of hamburger is approx. 3.7 kcal/g. If a man eats 0.45 lbs of hamburger for lunch and none of the energy is stored in his body, estimate the amount of water that would have to be lost in perspiration to keep his body temperature constant. The heat of ...
Wednesday, October 20, 2010 at 2:46pm
college
a description of the “gestalt revolt”
Wednesday, October 20, 2010 at 2:22pm
college
How do i calculate the number of equivalents of h2c4h4o4 titrated?
Wednesday, October 20, 2010 at 12:36pm
College Chemistry
"A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl from the reagent shelf using a graduated cylinder to obtain...
Wednesday, October 20, 2010 at 10:49am
college
When I was considering what to do with my $10,000 Lottery winnings, my broker suggested I invest half of it in gold, the value of which was growing by 12% per year, and the other half in CDs, which were yielding 5% per year, compounded every 6 months. Assuming that these rates...
Wednesday, October 20, 2010 at 12:54am
college
A volume of 25.0 ml of 0.100 M CH3CO2H is tiltrated with 0.100 M NaOH. What is pH after the addition of 12.5 mL of NaOH? (Ka for CH3CO2H = (1.8 x 10-5)
Wednesday, October 20, 2010 at 12:22am
College Geology Homework
Suppose you have a sample of potassium feldspar from a rhyolite and you measure the ratio of atoms of 40Ar to 40K of 0.024 to 1, or for every 10000 atoms of 40K you find 240 atoms of 40Ar. For this problem, consider the decline of 40K from an initial value to the measured ...
Wednesday, October 20, 2010 at 12:10am
college Geol 101
Suppose you have a sample of clamshell at a Paleoindian site and you measure the 14C activity of a 100-gram sample of carbon as 320 disintegrations per minute (or 3.2 disintegrations per gram of carbon per minute). a.What was the activity (in disintegrations per minute) for ...
Wednesday, October 20, 2010 at 12:04am
College Stat
Draw a vertical line through a normal distribution for each of the following z- score locations. Determine whether the body is on the right or left side of the line and find the proportion in the body. (a). z = 2.20 (b) z = 1.60 (c) z = -1.50 (d) z = - 0.70
Tuesday, October 19, 2010 at 11:39pm
College Chemistry
The Question Is: "A student weighs 0.347 g of KHP on a laboratory balance. The KHP was titrated with NaOH and the concentration of the NaOH determined to be 0.110 M. For the second titration, the student correctly diluted 6 M HCl from the reagent shelf using a graduated ...
Tuesday, October 19, 2010 at 11:10pm
College Chemistry
"What is the pH of a solution that is 0.50 M in sodium acetate and 0.75 M in acetic acid? (Ka for acetic acid is 1.85 x 10-5)." Would i use the Ka expression formula??
Tuesday, October 19, 2010 at 11:02pm
College Physics
Conceptual Question: Many people believe that a vacuum created inside a vacuum cleaner causes particles of dirt to be drawn in. Actually, the dirt is pushed in. Explain.
Tuesday, October 19, 2010 at 10:53pm
CRT 205
Crt 205 Vacuum Sales Digital Story Text Axia College Material Text of the Vacuum Sales Digital Story This text provides the script of the Vacuum Sales digital story. Use this text as an alternative or supplement to viewing the digital story itself. Script “The other day ...
Tuesday, October 19, 2010 at 10:50pm
college
describe how statistics can be important and influential in the nursing profession. Provide at least two examples where you have observed statistics to contribute positively to the needs of the customer.
Tuesday, October 19, 2010 at 9:29pm
US History
29. The Greenback party and Farmers' Alliances both called for a. putting more money into circulation b. opening American markets to foreign crops c. cutting back on protests d. repealing the Sherman Silver Purchase Act I can't seem to find the answer for this... 32. ...
Tuesday, October 19, 2010 at 5:36pm
US History
29. The Greenback party and Farmers' Alliances both called for a. putting more money into circulation b. opening American markets to foreign crops c. cutting back on protests d. repealing the Sherman Silver Purchase Act I can't seem to find the answer for this... 32. ...
Tuesday, October 19, 2010 at 12:24pm
college
find domain of f(x)=3/x+5 + 2radical x-1
Tuesday, October 19, 2010 at 11:05am
English
Write several sentences describing a recent interaction with a friend or family member about personal finance or credit cards. · Use at least five different pronouns in your sentences. Please let me know if I have done this correctly. While away at college my daughter ...
Tuesday, October 19, 2010 at 2:09am
College Chemistry
What is the wavelength(in meters) of a proton(mass=1.673x10^-24g) that has been accelera ted to 25% of the speed of light?
Tuesday, October 19, 2010 at 12:08am
algebra
In a college, some courses contribute more towards an overall GPA than other courses. For example, a science class is worth 4 points; mathematics is worth 3 points; history is worth 2 points; and English is worth 3 points. The values of the grade letters are as follows, A= 4, ...
Monday, October 18, 2010 at 7:50pm
US History
Last 4 for the day! 19. Most pioneers who settled west of the Appalachians were a. families looking for good land b. miners looking for gold and silver c. missionaries seeking converts d. bankers from New York and Boston A? 20. What message did Protestant revivalists preach in...
Monday, October 18, 2010 at 7:31pm
college chemistry
Use standard enthalpies of formation to determine ƒ¢Horxn for: 2NH3(g) + 3O2(g) + 2CH4(g) ¨ 2HCN(g) + 6H2O(g) in kilojoules. Find the change in internal energy for this reaction in kJ
Monday, October 18, 2010 at 5:51pm
college
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 14.0 g to 100°C in boiling water and then dropped the hot coin into 29.5 g of water at T = 15.0°C in an insulated coffee-cup, and ...
Monday, October 18, 2010 at 5:17pm
College mechanic vibration
A half-car model of an automobile suspension system is shown below. You are to design its suspension systems (values of spring constants and damping constants). Generally, for ride comfort, it is desired to have the bounce motion at low frequency and the pitch motion at ...
Monday, October 18, 2010 at 4:00pm
US History
4. The power of judicial review allows federal courts to decide a. who will be President if the Electoral College is tied b. if state and federal laws are constitutional c. if legislative acts should be signed into law d. on the size of the military B? 9. One effect of the ...
Monday, October 18, 2010 at 3:24pm
College Math
Your small library of books consists of 6 novels, 7 mathematics books, and 1 biology book. Calculate the number of ways to arrange them on a bookshelf for each of these situations. a) The books can be arranged in any order? b The novels must be together but the other books can...
Monday, October 18, 2010 at 1:28pm
college algebra
Shondra wants to enclose a rectangular garnden with 240 yards of fencing. What dimensions for the garden will maximize its area?
Sunday, October 17, 2010 at 11:16pm
college
Q. A soccer ball is kicked from the ground. When it reaches a height of 5.74 m, the velocity is v=5.86i+7.50j m/s. a) Determine the maximum height that the ball reaches. b) Determine the total horizontal distance travelled by the ball. c) What is the speed of the soccer ball ...
Sunday, October 17, 2010 at 7:51pm
college algebra
a bus driver wants to average at least 40 miles per hour on a 70 mile trip. if the first 35 miles takes the driver 1 hour what should be the lowest average speed for the second 35 miles?
Sunday, October 17, 2010 at 7:29pm
college
I need to write a topic sentence outline from researching sources pretaining to drug addiction and also create a reference list
Sunday, October 17, 2010 at 6:56pm
college chemistry
A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas (1)(0.285) = n(0.0821)(273). .0036 is this correct?
Sunday, October 17, 2010 at 5:33pm
College Physics
The four tires of an automobile are inflated to a gauge pressure of 2.0x10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile.
Sunday, October 17, 2010 at 5:31pm
college Algebra
This is my problem: A carpenter is building a rectangular room with a fixed perimeter of 336 ft. What dimensions would yield the maximum area? What is the maximum area? I am confused on what steps it takes to come up with the answer. I would like an example if possible with ...
Sunday, October 17, 2010 at 5:01pm
college/human services
I am writing a paper about the affect of political and technical aspects of planning and evaluation on a senior center. Can anyone help with links to what the political aspects are? I found some for the technical aspects and they relate to evaluations mostly.
Sunday, October 17, 2010 at 3:40pm
college chem
A balloon is filled with 2.3 cm3 helium gas at 112.1 atm pressure. What will be the new pressure (atm) if the volume is changed to 44.7 cm3? P1V1=P2V2 (112.1)(.0023)=(P2)(.0447) the answer i got was 54.85 so would the answer be 54.85 atm?
Sunday, October 17, 2010 at 8:35am
College Chemistry
Write the condensed ground-stste electron configuration of the transition metal ion Mo3+
Sunday, October 17, 2010 at 1:03am
College Chemistry
Draw an orbital diagram showing valence electrons and write the condensed ground-state electron configuration for Se3+
Sunday, October 17, 2010 at 12:56am
math
Urban Community College is planning to offer courses in Finite Math, Applied Calculus, and Computer Methods. Each section of Finite Math has 40 students and earns the college $40,000 in revenue. Each section of Applied Calculus has 40 students and earns the college $60,000, ...
Saturday, October 16, 2010 at 9:51pm
college chemistry
What volume (in Liters) of hydrogen must react to form 17.0L of ammonia according to the following balanced equation: N2(g) + 3H2(g) --> 2NH3(g) Assume an excess of N2 and that all are at the same temperature and pressure.
Saturday, October 16, 2010 at 8:25pm
College Chemistry
Write the electron configuration for Se using the noble gas core format.
Saturday, October 16, 2010 at 8:10pm
College Chemistry
an iron ore sample was dissolved in Hydrochloric acid the iron was obtained as Fe2+. The solution was titrated with 41.08 mL of a 0.458 M solution of Ce+. Calculate the mass of iron in the original ore sample.
Saturday, October 16, 2010 at 7:30pm
college
Liver alcohol dehydrogenase (ADH) is a nonspecific enzyme. Its normal substrate is ethanol but it will oxidize other primary alcohols like methanol. Methanol produces formaldehyde which is quite toxic and can lead to blindness. A dog ingested about 36 ml of windshield fluid ...
Saturday, October 16, 2010 at 7:23pm
College Physics
Some kid (mass 20 kg) jumps with a velocity of 3.2 m/s horizontally off some steps (height 0.55 m) onto his heavy duty skateboard (mass 3 kg, height 0.03 m), which is initially at rest. How fast will he be skating? I don't where to start.
Saturday, October 16, 2010 at 4:45pm
College Physics
A golf ball (mass 0.045 kg) is hit with a club from a tee. The plot shows the force on the ball as a function of time in milliseconds. One millisecond is 10-3 seconds. What is its speed right after the hit?
Saturday, October 16, 2010 at 4:43pm
College Chemistry
if 5.25g of ice AT 0 c IS PLACED IN 25.63 G OF LIQUID WATER AT 28c, WHAT WILL BE THE FINAL TEMPERATURE OF THIS MIXTURE?
Saturday, October 16, 2010 at 4:22pm
College Chemistry
if 5.25g of ice AT 0 c IS PLACED IN 25.63 G OF LIQUID WATER AT 28c, WHAT WILL BE THE FINAL TEMPERATURE OF THIS MIXTURE?
Saturday, October 16, 2010 at 4:16pm
College Chemistry
A Cylinder is filled with 1.20 mol of He(g) at 25 C under ambient pressure of 0.966 atm. The gas in the cylinder is then heated with 1.430 KJ of heat, and the piston is raised by the expanding gas under the constant ambient pressure. Calculate the following after expansion. a...
Saturday, October 16, 2010 at 3:33pm
college chemistry
An electrical heater is used to add 19.50 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 4.50°C. When 1.75 g of butanol (C4H9OH) is burned in the same calorimeter, the temperature increases by 14.58°C. Calculate the molar ...
Saturday, October 16, 2010 at 3:26pm
college chemistry
Manometers can use liquids other than mercury to measure small pressure differences. On a day when the barometric pressure is 761.7 torr, a water manometer, connected between the atmosphere and a glass bulb containing a sample of helium gas has a height difference of 26.1 cm, ...
Saturday, October 16, 2010 at 3:23pm
college
A newly discovered planet is found to have a circular orbit, with a radius equal to 11 times the radius of Earth's orbit. How long does this planet take to complete one orbit around the Sun?
Friday, October 15, 2010 at 8:54pm
college English
Also, had they of done research on wills and added fact based information, than this would have made a crucial impact. Is the writing after "Also" a restritive or nonrestrictive phrase? I think that what is after "also" is restrictive but what is after the ...
Friday, October 15, 2010 at 10:43am
college
A bag contains a mixture of copper and lead BBs. the Average density of the BBs is 9.50g/cm^3. Assuming that the copper and lead are pure determine the relative amounts of each kind of BB
Friday, October 15, 2010 at 4:34am
college
Using your textbook (Chapter 5), describe the model of consumer buyer behavior. Providing a list of the steps or a graphic of the model is not adequate as you must explain how the process works in the real world using your own words.
Thursday, October 14, 2010 at 3:30pm
college math
I if a Thrifty Market has a parking lot with dimension 125 feet by 210 feet. How many square yards is that?
Thursday, October 14, 2010 at 3:20pm
College Calculus 1
We have to find the first and second derivative of f(x)=x^(2/3)(6-x)^(1/3) I have the first derivative as being (4-x)/(x^(1/3)(6-x)^(2/3)) And that I know is right. The second derivative is -8/(x^(4/3)(6-x)^(5/3)) I did all the work but I am not getting the right answer... I ...
Thursday, October 14, 2010 at 3:16pm
College Physics
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96.5 kg. The mass of the rock is 0.250 kg. Initially the wagon is rolling forward at a speed of 0.460 m/s. ...
Thursday, October 14, 2010 at 1:28pm
College Algebra and Trig
a rancher has 12,000 feet of fence to enclose 5 adjacent pens. determine the outer rectangular dimensions that result the maximum enclosed area.
Thursday, October 14, 2010 at 1:05pm
Chemistry
How many kilograms of chlorine are in 26 kg of C2F3CL3?
Wednesday, October 13, 2010 at 11:35pm
Chemistry
How many kilograms of chlorine are in 26 kg of C2F3CL3?
Wednesday, October 13, 2010 at 11:34pm
College Physics!
Is there any way i can just get these problems set up? I just need help with the steps on how to do it. A box weighing 600 N is pushed along a horizontal floor at a constant velocity with a force of 250 N parallel to the floor. What is the coefficient of Kinetic friction ...
Wednesday, October 13, 2010 at 10:36pm
college physics
Arthur (mass 78 kg) and Violet (mass 31 kg) are trying to play on a seesaw. If Violet sits 3.6 m from the fulcrum, at what distance from the fulcrum should Arthur sit?
Wednesday, October 13, 2010 at 9:48pm
college pre-calc
how do you know if there are holes in a rational function?
Wednesday, October 13, 2010 at 8:57pm
college algebra
Use point-slope form to write the equation of the line with the given properties. Write the equation in standard form. m is undefined passing through P(-7, -7)
Wednesday, October 13, 2010 at 6:56pm
college criminal justice
which theory of crime do you think best explains the prevalence of crime in the United States; Explain your answer by giving an example?
Wednesday, October 13, 2010 at 6:41pm
college
what to do if order-taking system becomes obsolete?
Wednesday, October 13, 2010 at 4:51pm
college organic chemistry
Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?
Wednesday, October 13, 2010 at 1:23am
college AP Chemistry
if a metal ore contains 22.5% pure metal how many pounds of pure metal can be obatained from 36 pounds of metal ore? anser in units of pounds.
Tuesday, October 12, 2010 at 10:03pm
7th grade
you have 8 moving boxes that you can use to pack for college. each box holds 15 lbs of clothing or 60lbs of books. let c be the number of boxes that contain clothing. write a function that gives the total pounds T of the boxes in terms of the number of boxes that contain ...
Tuesday, October 12, 2010 at 8:17pm
college
You are replacing an old piece of machinery with a new one that offers improved technology and efficiencies to your company. The new machine will cost you $50,000 and it will provide you with a cash inflow of $10,500 PER YEAR for the next 7 years. You can sell the old machine ...
Tuesday, October 12, 2010 at 6:49pm
college chemistry
When a sample of HI(g) (5.825 mol) is placed in 320.0 L reaction vessel at 702.0 K and allowed to come to equilibrium the mixture contains 1.052 mol of H2(g). What is the equilibrium concentration (mol/L) of HI(g)? 2HI(g) = H2(g)+I2(g)
Tuesday, October 12, 2010 at 6:14pm
college chemistry
When a sample of NO(g) (388.1 grams) is placed in 290.0 L reaction vessel at 500.0 °C and allowed to come to equilibrium the mixture contains 53.28 grams of N2(g). What is the concentration (mol/L) of O2(g)? 2NO(g) = N2(g)+O2(g)
Tuesday, October 12, 2010 at 6:03pm
college
the area A of a triangle is calculated as A= 1/2 hB. If the height h is 12 feet and the base B is 4 feet long, what is the area, in square feet?
Tuesday, October 12, 2010 at 5:20pm
college
how did the social order and ways of life differ between the southern and northern colonies?
Tuesday, October 12, 2010 at 4:37pm
college
need help in financial accouting
Tuesday, October 12, 2010 at 1:21pm
college, statistics
a math test has a mean of 43 and a standard deviation 0f 17.0. find the corresponding z scores for. show all work. I. a test score of 13 II. a test score of 59
Monday, October 11, 2010 at 11:55pm
Chemistry
Hi, I have to take chemistry placement test for college this week. Does anyone here have advice for studying to prepare for the test? I took chemistry in high school 2 years ago so I don't remember anything.
Monday, October 11, 2010 at 9:59pm
college math
Please help me solve this Find the value of k so that the polynomial Q(x)= x^3 - k^2x^2 + k(5x-9)- 12 has a remainder of 1 when divided by x + 2
Monday, October 11, 2010 at 7:58pm
college
what is a good thesis about autumn leaves, so i can write my parpagraph
Monday, October 11, 2010 at 5:46pm
college physics
Imagine that your car can travel 25 mi on 1 gal of gas when traveling on a level road at 55mi/h. Estimate your gas mileage while traveling at 55 mi/h up an incline that gains 3m in elevation for every 100 m one goes forward along the incline. Assume that your car has a mass of...
Monday, October 11, 2010 at 5:02pm
college
I need help sketching the graph of 2sqrt(x)-x using differentiation
Monday, October 11, 2010 at 4:52pm
college
Defendant A was suspected of selling stolen property from his dorm room. An undercover campus police officer knocked on Defendant A’s door. And when answer, asked for an affordable radar detector. In response, defendant A said that he just got two new ones last night. ...
Monday, October 11, 2010 at 3:26pm
college
How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when using a 95% confidence interval?
Monday, October 11, 2010 at 1:43pm
college
organic chemistry lab and why is water the first choice for recrystallization when all factors are equal?
Monday, October 11, 2010 at 12:08am
College Physics
As part of a training program, an athlete runs while holding 8.00 weights in each hand. As he runs, the weights swing through a 30.0 arc in . His hands are 72 from his shoulder joint, and they are light enough that we can neglect their weight compared with that of the 8.00 ...
Sunday, October 10, 2010 at 10:58pm
college physics
The 665 N weight held by two cables. The left-hand cable had tension T2 and makes an angle of 43 degrees with the ceiling. The right-hand cable had tention t1 and makes an angle of 48 degrees with the ceiling. What is the tension in the cable labeled t1 slanted at an angle of ...
Sunday, October 10, 2010 at 9:56pm
college Finite
Find the probability of at least 3 successes and at least 2 failures. N(trials)=10 and p=3/10
Sunday, October 10, 2010 at 5:59pm
college Physics
A car is traveling at 7.0 m/s when the driver applies the brakes. the car move 1.5m before it comes toa complete stop. if the car had been moving at 14m/s how far would it have continued to move after the brakes were applied? assume the braking force is constant. what is the ...
Sunday, October 10, 2010 at 3:08pm
Mat 126
A community college has 3,000 students and 90 instructors. The college plans that enrollment will be 3,500 next year. How many new instructors should be hired if the college wants to keep the same student to instructor ratio? 13 instructors 15 instructors 105 instructors 77 ...
Sunday, October 10, 2010 at 12:26pm
college
How many milliliters of 0.100 M KOH would you need to titrate 25.0 mL of the oxalic acid solution
Saturday, October 9, 2010 at 8:56pm
college algebra
Kepler’s third law. According to Kepler’s third law of planetary motion, the ratio t^2/r^3 has the same value for every planet in our solar system. R is the average radius of the orbit of the planet measured in astronomical units (AU), and T is the number of years it...
Saturday, October 9, 2010 at 6:52pm
Grammer
Can you find 20 errors in these paragraphs? Why are great numbers of students choosing to pursue their college degrees using their home computers. Benjamin Franklin said; A penny saved is a penny earned”. This principle applies to the american and foreign online student. ...
Saturday, October 9, 2010 at 6:24pm
college kinetics chem
what is the rate law for 2OF2 yeilds O2 + 2F2
Saturday, October 9, 2010 at 3:27pm
physics college
An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is its acceleration? A car is stopped at a traffic light. It ...
Friday, October 8, 2010 at 10:49am
college
f(x) = 4 e**(5 x); f(x)=A b**x
Friday, October 8, 2010 at 1:53am
college math 116
Functions are a lot like equations. In a function we look at the relationship of the variables. Does one variable depend on the other. In a function when you see f(x) it just means "y." So we have an equation y = 2x + 3 and a function that is f(x) = 2x + 3. When ...
Thursday, October 7, 2010 at 11:05pm
college
A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ...
Thursday, October 7, 2010 at 4:46pm
College Chemistry
what is the maximum weight of CuCl that can be prepared from the reaction sequence using 1.0g of Cu turnings to prepare the Cu2+ solution?
Thursday, October 7, 2010 at 7:38am
College Chemistry
how many grams of metallic copper are required to react with the number of moles of Cu2+ , 0.16mol, to form CuCl overall reaction can be taken as: Cu2+(aq) + 2 Cl- (aq) + Cu(s)-->2CuCl(s)
Thursday, October 7, 2010 at 7:28am
College Chemistry
The Cu2+ ions in this experiment are produced by the reaction of 1.0 g copper turnings with excess nitric acid. How many moles of Cu2+ are produced?
Thursday, October 7, 2010 at 12:58am
college
I am stuck on Appendix B in psy/230 I am to find the five major concepts or events in three history periods 1930- 1950 I chose tit theory humanistic thoery cognitive theories learning theories and cognitiv/cosil leraning then 1950-1970 ther three factor model extraversion, ...
Thursday, October 7, 2010 at 12:43am
College physics
The motor of a ski boat generates an average power of 7.30 104 W when the boat is moving at a constant speed of 10 m/s. When the boat is pulling a skier at the same speed, the engine must generate an average power of 8.40 104 W. What is the tension in the tow rope that is ...
Wednesday, October 6, 2010 at 10:16pm
College Physics
The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4.5 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?
Wednesday, October 6, 2010 at 10:02pm
college statistics
In Chapter 5, Exercise 9, we studied the variability of crime rates and police expenditures in the eastern and Midwestern United States. We’ve now been asked to investigate the hypothesis that the number of crimes is related to police expenditures per capita because ...
Wednesday, October 6, 2010 at 8:39pm
college
A 26 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables? help please!
Wednesday, October 6, 2010 at 10:09am
college
200- to 300-word response addressing the following questions: o What everyday changes, if any, might you make to increase the amount of energy expended in your day-to-day activities? o What types and amounts of exercise would work best for you? o Can the activities be ...
Wednesday, October 6, 2010 at 1:14am
social studies
Please check my answers 1) The American colonists based their right to revolt against Britain’s authority on the claim that a. the wealth of the new world belonged to them, since they had developed it through their labor. b. the colonial charters had expired, which made ...
Tuesday, October 5, 2010 at 10:11pm
college physics
Let the radius of the circular segment be 108 m, the mass of the car 1861 kg, and the coefficient of the static friction between the road and the tire 0.9. The banking angle is not given. Find the magnitude of the normal force N which the road exerts on the car at the opti-mal...
Tuesday, October 5, 2010 at 8:10pm
college/Public Speaking
What might be some modern examples of speech styles that weren't discussed in the lecture? Don't think just in terms of public speaking. Consider such elements as how technology has changed communication in the last few years. Defend why you consider these to be modern...
Tuesday, October 5, 2010 at 4:40pm
college chemistry
please help! If the initial pressure of I2(g) is 1.738 atm, calculate the % decomposition of I2(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 1000 K is 0.254. The initial pressure of the reaction products is 0 atm. I2(g) = 2I(g)
Tuesday, October 5, 2010 at 2:41pm
college chemistry
The value of the equilibrium constant, Kc, at a certain temperature is 4.00 x 10-1. Would the reaction as represented by the chemical equation favor reactants or products? Enter P or R. N2(g)+3H2(g) = 2NH3(g)
Tuesday, October 5, 2010 at 2:30pm
college physics
Two workers are loading crates onto a pick up truck. Worker 1 lifts his crate straight up from the ground to the truck. Worker 2 slides his crate up a ramp which has frictionless rollers. Which statement is true about the work being done on the crate? a. Worker 1 does more ...
Tuesday, October 5, 2010 at 11:35am
college physics
Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...
Tuesday, October 5, 2010 at 11:34am
college physics
Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
Tuesday, October 5, 2010 at 11:33am
college physics
Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can...
Tuesday, October 5, 2010 at 11:33am
College Chem
Recycling of PET soft drink bottles involves heating with methanol and an acid catalyst to liberate ethylene glycol and dimethylterphthalate (methyl ester of pthalic acid). These can then be used as monomers to make new PET products. Write an equation for this recycling reaction.
Monday, October 4, 2010 at 11:37pm
College Physics
Margaret walks to the store using the following path: 0.420 miles west, 0.265 miles north, 0.300 miles east. What is her total displacement? That is, what is the length and direction of the vector that points from her house directly to the store?
Monday, October 4, 2010 at 8:55pm
college physics
Which of the following statements about special relativity is false? a).The proper length of an object is always larger than the length of the object in a frame where it is moving. b).The proper length of an object depends on the relative speed between the object and an ...
Monday, October 4, 2010 at 5:22pm
Austin Community College
Name three portable devices that can be used for removing data from a computer and taking the data out of a building.
Monday, October 4, 2010 at 5:21pm
College Physics
Which of the following statements is false? 1)The velocity of an object can change while maintaining a constant speed. 2)An object that maintains a constant speed must have zero acceleration. 3)An object that has a non-zero acceleration must have a changing velocity. 4)The ...
Monday, October 4, 2010 at 5:19pm
college chemistry
At 625 K the value of Kc for the equilibrium represented by the balanced equation is 2.50 x 100. Calculate the value of Kp at the same temperature. Express answer in scientific notation. 2NH3(g) = N2(g)+3H2(g)
Monday, October 4, 2010 at 5:12pm
College Physics
A car starts from rest on a curve with a radius of 150 m and accelerates at 1.50 m/s^2. How many revolutions will the car have gone through when the magnitude of its total acceleration is 3.20 m/s^2 ?
Monday, October 4, 2010 at 5:10pm
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