Wednesday
November 26, 2014

Posts by katie


Total # Posts: 1,690

chemistry
3 moles C6H12O6 in 100 ml equals what molarity?
November 25, 2014

Chemistry
oh i get it, it came from the initial... thank you !
November 12, 2014

Chemistry
why is it 2-2x? isn't it only just -2x?
November 12, 2014

Chemistry
Consider the following equilibrium: 2HI(g) *are in equilibrium with* H2(g) = I2(g) Keq = 81.0 A 2.00L container is initially filled with 4.00 mol HI. Calculate the [HI] at equilibrium. *I don't know how to put the equilibrium sign on the computer* Can someone please ...
November 12, 2014

Chemistry
I'm having trouble understanding Boyle's Law and Dalton's law of partial pressures. Can anyone help me work this please? Thank you A sample of propane gas, C3H8, was collected over water at 22.5 ºC and 680. torr. The volume of the wet gas is 3.89 L. What will ...
November 8, 2014

English: Faulty Coordination
Thank you Ms. Sue! But does my correction of #1 work? Is it correct?
October 29, 2014

English: Faulty Coordination
Rewrite the over coordinated sentences that follow, changing clauses into phrases or into single words. where appropriate, break the over coordinated sentence into two sentences. 1. The doctor inserted one end of a long tube into my throat, and she attached the other end of ...
October 29, 2014

Physics
A figure skater is spinning at a rate of 1.1 rev/s with her arms outstretched. She then draws her arms in to her chest, reducing her rotational inertia to 66% of its original value. What is her new rate of rotation?
October 26, 2014

physics
A line directed to the west. A plane flies 20 degrees north of that direction ( 90 degrees north of that direction would be north..) if the plane flies for 340 km, determine its displacement toward the west and its displacement toward the north during its flight?
October 23, 2014

math
The Murphy family just drove 300 miles to visit their grandparents. Mr. Murphy drove 70 mph for 65% of the trip and 35 mph or less for 20% of the trip that was left. Assuming that Mr. Murphy never went over 70 mph, how many miles did he travel at a speed between 35 and 70 mph...
October 22, 2014

Chemistry
thank you very much!
October 16, 2014

Chemistry
oh I mean, is 3 a heterogeneous reaction, not 3a. But a gas and an aqueous is a heterogeneous reaction correct? Thanks!
October 16, 2014

Chemistry
Increasing the surface area will increase the reaction rate in: 1. N2(g) + O2(g) -> 2NO(g) 2. 2Mg(s) + O2(g) -> 2MgO(s) 3. CaCO3(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) + CO2(g) MY WORK: I think it is 2 & possibly 3. 1 is a homogeneous reaction but is 3 a heterogeneous ...
October 16, 2014

Physics
A car accelerates from rest at 5 m/s2 for 5 seconds. It moves with a constant velocity for some time, and then decelerates at 5 m/s2 to come to rest. The entire journey takes 25 seconds. On a separate sheet of paper, plot the velocity-time graph of the motion. Describe the ...
September 30, 2014

Physics
You want to use a rope to pull a 12-kg box of books up a plane inclined 30∘ above the horizontal. The coefficient of kinetic friction is 0.29. The rope pulls parallel to the incline. What force do you need to exert on the rope if you want to pull the box with a constant ...
September 30, 2014

college physics
tennis ball rolls off the edge of a tabletop 0.900m above the floor and strikes the floor at a point 1.60m horizontally from the edge of the table. A: Find the time of flight of the ball B: Find the magnitude of the initial velocity of the ball. C: Find the magnitude of the ...
September 22, 2014

Algebra 1
the temperature at noon in los angeles on a summer day was 88 degrees fahrenheit. during the day, the temperature varies from this by as much as 7.5 degrees fahrenheit. write and solve an absolute-value inequality to find the range of possible temperature for that day.
September 11, 2014

geometry
ABCD is a rhombus with diagonals Imported Asset and Imported Asset . Is angle ABD congruent to angle CBD?
July 7, 2014

ashford
Ruby emailed her instructor a question and he replied to her immediately.
July 2, 2014

math
That helped. Thankyou Ms.Sue
June 11, 2014

math
a 15 foot ladder is leaning against a house with the base of the ladder 4 feet from the house. How high up the house does the ladder reach? round to the nearest tenth foot.
June 11, 2014

Math
12
June 10, 2014

math
What is the period, in seconds, of a simple pendulum of length 3 meters? Use the gravitational constant g = 9.8 m/s2 and round your answer to two decimal places Please help! A step by step would with the answer would be helpful!
June 9, 2014

Pre-Calc
2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) NOTE: I tried to do these myself and got that: a= (4.99,0.27) b=(-1.99,-0.11) Which I know these are wrong, so I don't know how to do ...
June 7, 2014

Chemistry
A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 24.71 mL to reach a phenolphthalein end point. What is the molarity of...
June 6, 2014

science
A rock tumbles straight down from a cliff, its moving at 20 m/s when it hits. What is the height of the cliff? The mass of the rock is 8 kg. a) 2.5 m b) 400 m C) 20.4 m d) 160 m
May 23, 2014

physics
A subcompact car, mass 1,000 kg, runs into and sticks to an at rest, 2,200 kg SUV. If their final speed is 4.7m/s ,what was the smaller cars initial speed? a) 67 m/s b) 30m/s c) 2.2 m/s d) 15 m/s
May 23, 2014

FInite Math
A car rental agency has rental and return facilities at both Dallas and Austin Airports. Assume that a car rented at either airport must be returned to one or the other airport. If a car is rented at Austin, the probability that it will be returned there is .80; If a car is ...
May 6, 2014

General Chem 2
Given: Al3+(aq) + 3e– --> Al(s); E° = –1.66 V I2(s) + 2e– --> 2I–(aq); E° = 0.54 V What is ∆G° for the following cell reaction? 2AlI3(aq) --> 2Al(s) + 3I2(s) A) 4.2 × 105 J B) –6.5 × 105 J C) –1.3 × ...
May 3, 2014

algebra
George has 25 marbles. he wants to divide them into two amounts hat show a ratio of 2:3 how many marbles are in each group?
April 27, 2014

math
determine the intervals for which the curve r(t)=4sin^3(t)i+7cos^3(t)j is smooth on [0,2π
April 27, 2014

Stats Class HELP!
Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard ...
April 18, 2014

Stats. Class
a. What sample size would be needed to estimate the true proportion of students at your college who are wearing backpacks, with 95% confidence and and error of +/-0.04? b. What sampling method would you recommend? Why?
April 18, 2014

Stats Class
The EPA city/hwy mpg range for a Saturn Vue FWD automatic 5-speed transmission is 20 to 28 mpg. If you owned this vehicle, how large a sample (e.g. how many tanks of gas) would be required to estimate your mean mpg with an error of ±1 mpg and 90% confidence? Explain ...
April 18, 2014

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
April 15, 2014

statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
April 15, 2014

statistics
Which of the following percentiles corresponds to the area beneath the standard normal curve from a z score of-3.00 to + 3.00? a. 98% b. 100% c. 95% d. 99.7%
April 15, 2014

statistics
Jorge finds that his standardized z score on an IQ is 2.0. What percentage of people did he score higher than? a. 98 b. 96 c. 68 d. 34
April 15, 2014

math
A jar of coins has only nickels and quarters, which are worth a total of $3.25. There are 5 fewer quarters than nickels. How many quarters and nickels are in the jar?
April 14, 2014

Chemistry
Based on the mechanisms that you have determined and the information in the introduction, what is the product of 1-cholorobutane after reaction under the sodium iodide conditions? The ethanolic silver nitrate conditions?
April 14, 2014

9th grade math
Ok, trent, so if solving for m use this formula: (Google quadratic formula to see formula) so, -b should be 24, b^2 should be -24^2, a should be 4 and c should be 36. The answer should be m=3. -------But if you are to foil this, then 4m^2-24m+36 will be (4m-12)(m-3).
April 8, 2014

Chemistry
For a reaction that has an equilibrium constant of 9 × 10–9, which of the following statements must be true? A) ∆G° is positive. B) ∆G° is negative. C) ∆H° is negative. D) ∆H° is positive. E) ∆S° is positive.
April 6, 2014

Chemistry
The standard enthalpy of fusion of iodobenzene is 9.75 kJ/mol at its melting point, 241.8 K. What is the standard change in entropy for the melting of iodobenzene at its melting point? A) –9.75 J/(mol • K) B) –311 J/(mol • K) C) 0.0403 J/(mol • K) D) ...
March 31, 2014

Chemistry
The presence of ammonia in a solution of AgCl will decrease the solubility of AgCl. True Or False
March 31, 2014

physics
is it d = 1/2 (9.8) (3)^2 = 44.1 m/s^2/3s =14.7 m/s x 2 = 32.87 = 32.87 mi/h? and b) d= 1/2 (9.8) (3)^2 =44.1 m/s^2/35 = 14.7 m/s
March 30, 2014

physics
a student drops an object out the window of the top floor of a high-rise dormitory a) neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 3.0 s? express the speed in mi/h for a familiar comparison, b) how far, in meters, does ...
March 30, 2014

physics
does this change the answer... the ball is dropped from the top of an 80-m-high building. does the ball reach the ground in 4.0 s? I got no, it falls only 78 m in 4.0 s What speed does the ball in the first question have in falling 3.5 s?
March 30, 2014

physics
a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
March 30, 2014

physics
a car travels on a straight road. a) starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s^2 b) in 4.0 more seconds, the car is going 88 ft/s (60 mi/h). what is the car's average acceleration for this...
March 30, 2014

physics
why is it not 30-0/20=1.5 and 5/20=4 km/min = 4,000 m/min = 66.67 m/s?
March 30, 2014

physics
modern oil tankers weigh more than a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 20 min to come to a stop from a top speed of 30 km/h. What is the magnitude of a such a ship's ...
March 30, 2014

physics
a race car traveling northward on a straight, level track at a constant speed travels 0.750 km in 20.0 s. the return trip over the same track is made in 25.0 s. a) what is the average velocity if the car in m/s for the first leg of the run? b) what is the average velocity for ...
March 30, 2014

spanish - HELP!
The answer is nos!
March 25, 2014

AED
Thank you very much.
March 20, 2014

AED
I'm guessing for all ages.
March 20, 2014

AED
As we analyze Western thought vs. Eastern thought, we also should take a look at the application of each school of thought is applied. Lets say that American schools reform to include eastern philosophy in its curriculum. What steps would have to occur to prepare our students ...
March 20, 2014

please answer this one..
what is the mass in grams of one molecule of water... and is this one different from what is the mass in grans of one mole of water?
March 19, 2014

CHEMISTRY
What is the mass in grams of one Mole of water?
March 19, 2014

Chemistry
I believe it's 2.992x10^-23 grams... not sure
March 19, 2014

Chemistry
what is the mass in grams of one molecule of water?
March 19, 2014

physics
The angle of incidence and the angle of refraction for light going from air into a material with a higher index of refraction are 69.9° and 39.6°, respectively. What is the index of refraction of this material?
March 18, 2014

Math
A kite that is 7 feet tall casts a shadow that is 4 feet long. How long would the shadow be if a kite is only 4 feet tall?
March 18, 2014

Chemistry
A student has 600.0 mL of a 0.30M solution of HNO3. How much water must she add in order to make it a 0.15 M solution? Be careful how this question is answered.
March 14, 2014

math
A box contains only quarters and dimes. If there 10% more quarters, the total value of the money in the box would increase by 7.5%. What is the ratio of the number of quarters and dimes in the box? Express your answer as a common fraction.
March 4, 2014

math
Mrs. Marcincavage allowed each student in her math class to drop the lowest of their five test scores. When Matthew dropped the lowest of his test scores, a 60, his test average increased by 5 points. What is Matthew’s new test average?
March 4, 2014

math
A box contains only quarters and dimes. If there 10% more quarters, the total value of the money in the box would increase by 7.5%. What is the ratio of the number of quarters and dimes in the box? Express your answer as a common fraction.
March 4, 2014

chemistry
there is a 2 a 2 not 1 but 2KClO3→ 2KCl + 3O2
March 1, 2014

chemistry
when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 repeat 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced? chemistry - Da
March 1, 2014

chemistry
magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3 → 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
March 1, 2014

chemistry
I said 2KClO3
March 1, 2014

chemistry
when magnesium chlorate under goes decompostion, oxgen gas is realsed in the following reaction: 2KClO3→ 2KCl + 3O2 when 3.50 grams of potassuim chlorate is decomposed at STP, how many litters of oxgen will be produced?
March 1, 2014

Chemistry
Oh, alright. thanks though x)least i know im not the only one missing something
February 24, 2014

Chemistry
Really? My college professor marked it wrong on my work.. thats exactly what i had -_-
February 24, 2014

Chemistry
name the ions: Ag+ and P-3... and it's not silver..
February 24, 2014

Chemistry
How many grams of AL(NO3)3 are produced when 23.5 grams of Aluminum react with 133 mL of 6.5M HCL?
February 23, 2014

Chemistry help
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.77 nm. It then gives off a photon having a wavelength of 94 nm. What is the final state of the hydrogen atom?
February 20, 2014

College Algebra
A ball is thrown upward with an initial velocity of 48 ft/sec from a height 640 ft. Its height h, in feet, after t seconds is given by h(t)=-16t^2+48t+640. After how long will the ball reach the ground?
February 20, 2014

Chemistry
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 7.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 8.40 ...
February 19, 2014

TN History
Ive figured most out now, but i dont know how the state government in tn restore after the reconstruction era.. any book or website that would help answering this. ive tried for a while now and im not making any progress with this one single question.
February 18, 2014

TN History
Im not sure. It did help the slaves, but the whites didnt handle it all that well... they formed the KKK and right after this, the Confederates changed laws. so im not too sure...
February 18, 2014

TN History
how well did Tennessee deal with the four issues of Reconstruction; the status of its former Confederates, the restoration of the state government, economic reconstruction, and the status of former slaves? (Just one sentence would help me a lot... i know a lot of info but not ...
February 18, 2014

English
What resource whether its online etc can LGBT community support, how can they get help? Thanks!
February 15, 2014

physics
A stereo speaker represented by P in the figure below emits sound waves with a power output of 114 W. What is the intensity of the sound waves at point x when r = 11.8 m?
February 12, 2014

math
What is the approximate circumference of a pizza pan with a diameter of 13.2 inches? (Use π = 3.14)
February 5, 2014

physics
The wavelength of a pulse is 0.1925mm. There are 5 cycles in the pulse. What is the spatial pulse length?
February 5, 2014

physics
The pulse duration of the transducer is 0.6 microseconds. The frequency of the transducer is 8MHz. How many cycles are contained in that pulse?
February 5, 2014

physics
what is the propagation speed of a 5MHz transducer?
February 5, 2014

physics
The medium would be soft tissue. The speed in soft tissue is 1540 m/s.
February 5, 2014

physics
What is the wavelength of a 4MHz transducer?
February 5, 2014

physics
Yes, all my questions are for ultrasound physics. I should've mentioned that, sorry. Thanks for the help
February 5, 2014

physics
If an ultrasound beam at the focal zone has a power of 0.050 watts and the area at this focal zone is 4cm^2, what is the intensity of the beam?
February 5, 2014

Physics
I know the formulas, just having problems with the right units. I got 1205 Hz for this one????
February 5, 2014

Physics
If the period of a transducer is 0.83msec, what is the HZ?
February 5, 2014

physics
so would it be 0.2 microseconds? I just want to make sure I am understanding it correctly, with the correct units, thanks
February 5, 2014

physics
If the frequency of a transducer is 5MHz, what is the period?
February 5, 2014

Chemistry
The FDA recommends that women who are pregnant avoid eating more than three 6.00-oz servings of bluefish per month because of the relatively high mercury levels in that type of fish. If bluefish contains 0.341 ppm of mercury (that is, 0.341 oz of mercury per 1×106 oz of ...
February 1, 2014

Chemistry
An office heater puts out 2070 Btus (British thermal units) of energy in the form of heat per hour. Given that 1 Btu = 1.055 kJ, how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater (assume continuous operation)?
February 1, 2014

physics
the total electric field e consists of the vector sum of two parts. one part has a magnitude of e1 = 1284 n/c and points at an angle θ1 = 30° above the +x axis. the other part has a magnitude of e2 = 1833 n/c and points at an angle θ2 = 62° above the +x axis...
January 31, 2014

Chemistry
A particular MP3 encoder can convert 79.0 kilobytes (kb) of music per second from a typical music CD. How many minutes will it take to convert 13.3 megabytes (Mb) of music from a CD?
January 29, 2014

Algebra
ok thanks
January 22, 2014

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