Sunday

April 19, 2015

April 19, 2015

Total # Posts: 2,603

**Chemistry**

How do you calculate ΔSfus and ΔSvap for HCl given melting point,ΔHfus, boiling point, and ΔHvap also how do you determine the entropy change when 5.20 mol of HCl(l) freezes at atmospheric pressure.
*April 25, 2014*

**Chemistry**

The following equation represents the decomposition of a generic diatomic element in its standard state. (1/2)X2(g)--->X(g) Assume that the standard molar Gibbs energy of formation of X(g) is 5.45 kJ·mol–1 at 2000. K and –64.30 kJ·mol–1 at 3000...
*April 25, 2014*

**Chemistry**

Ok thanks a bunch!
*April 24, 2014*

**Chemistry**

how do you find lnQ?
*April 24, 2014*

**Chemistry**

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction C2H6(g)+H2(g)---->2CH4 the standard change in Gibbs free energy is ΔG° = -32.8 kJ/mol. What is ΔG for this reaction at 298 K when the ...
*April 24, 2014*

**Chemistry**

A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which ΔG°rxn = &#...
*April 24, 2014*

**math**

the drawing below measures 7.8 cm by 6.2 cm what is the perimeter in meters? scale 1cm=10m the drawing is square
*April 24, 2014*

**science 1 question**

ocean trenches are formed when the denser oceanic plate sinks
*April 23, 2014*

**health**

Sooo whats the answer????
*April 19, 2014*

**econ**

You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate which curves you will request and why...
*April 12, 2014*

**Macroeconomics**

I need help to answer this question? You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate ...
*April 12, 2014*

**physics help!**

a!!! It's A!
*April 10, 2014*

**Health**

A pound of butter since butter has more fat than lean meat does.
*April 3, 2014*

**Health**

Which would produce a greater number of Calories- a pound of lean meat or a pound of butter? Why is it so?
*April 3, 2014*

**Math**

The entrance hall to the Louvre Museum in Paris is a glass and metal pyramid with a surface area of approximately 1980 square on each side . The base of the pyramid is a square that is 35.4 meters on each side. What is the slant height of the pyramid ? Round to the nearest ...
*April 2, 2014*

**health**

So what is the answer???
*April 2, 2014*

**science(check answers)**

4 is C. and 5 is true.
*March 31, 2014*

**Algebra 1**

Hi! I'm doing my math homework, but I got confused. Can someone please help me how to solve simplest radical forms with an example? With square roots?
*March 20, 2014*

**Computers**

System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (e). 50 ...
*March 17, 2014*

**Calculusmath**

what is an equation of the conic section x^2+y^2=16 after a rotation of 45 degrees about the origin. A. (x')^2+(y')^2=16 B. (x')^2- (y')^2=16 C. (x')^2- 2x'y'+(y')^2=16 D. (x')^2+ 2x'y'+(y')^2=16
*March 12, 2014*

**science(check answers)**

b b d a
*March 11, 2014*

**chemistry**

Phosphoric acid is a triprotic acid, so H3PO4, H2PO4 -, and HPO4 2- are all acids. Which of the solutions below would have the lowest pH? 0.1 M NaH2PO4 0.1 M Na2HPO4 0.1 M Na3PO4
*March 10, 2014*

**World Geography**

If I were elected an official, I'd first of all be totally freaked out. That's because fifteen year old shouldn't be elected any type of office until their old enough to get a job. But second of all I'd try to fulfill whatever duty I was elected to do. I would...
*March 6, 2014*

**Physics**

A train 500 m long is moving on a straight track with a speed of 84.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration, determine how long the train blocked the crossing....
*March 5, 2014*

**Physics**

Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position?
*March 5, 2014*

**Science**

1.a 9.d 10.c
*March 5, 2014*

**math 4**

40 cm and 40 in
*March 3, 2014*

**computers**

1. It is important to include voice and point of view in writing because (1 point) A. It helps the reader understand the characters feelings and emotions B. It adds more words to the story C. It makes the information stand out D. It makes the story more important 2. A venn ...
*March 3, 2014*

**social studies**

do ur own homwurk
*February 23, 2014*

**ecology**

If you observe no changes in gene frequencies in a population over several generations, can you conclude that the population is not subject to natural selection?
*February 20, 2014*

**English**

If I wanted to search romanticism I would have done it, but I was hoping someone who already knows about it could help push me in the right direction/give me something to go on.
*February 20, 2014*

**English**

What was poetry like during the Romantic period? Discuss three characteristics of Romanticism. I'm looking for 1-2 sentences for the first question, and maybe 3-6 for the second question. Thank you so much to anyone who helps. Any help is appreciated. :)
*February 20, 2014*

**Chemistry**

A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the calorimeter is 24...
*February 18, 2014*

**math**

A manufacturer produces a 4-cup and 8-cup coffee maker. The 4-cup maker takes 6 hours to produce and the 8-cup takes 9 hours. The manufacturer has at most 500 hours of labor per week. a. Write an inequality to represent the number of each type of coffee makers they can produce...
*February 17, 2014*

**Wave**

Rebecca is wrong, but Henry is right.
*February 8, 2014*

**science**

1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? 4. A certain...
*February 8, 2014*

**math**

Oregon is about 400 miles from west to east, and 300 miles from north to south. If the image of Oregon on a map is 15 inches tall (form north to south), about how wide is the image of Oregon on the map?
*February 6, 2014*

**Help with science**

5 c 7 c
*February 3, 2014*

**physics**

ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
*February 2, 2014*

**physics**

Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
*February 2, 2014*

**algebra**

The perimeter of a pool is 64 feet and has a width of x and a length of x-4. Write an equation and find both the width and length of the pool.
*February 1, 2014*

**Chemistry**

Calculate the enthalpy change of formation for the following reactions using Hess's law, and the enthalpies of formation given in Figure 4: b) MgO +2HCl --> MgCl2 +H2O c)NaOH+ HCl -->NaCl +H20 Figure4: the given enthalpies of formation compound values are: Mg(OH)2 is...
*January 30, 2014*

**Physics**

UCSC?
*January 29, 2014*

**Physics**

For a rotating object the equation for acceleration is a = v^2 / r. The force is F = m*a = m*v^2 / r. The force in this problem is the coulomb force. F = k*3q*q / r^2 = m*v^2 / r Since the kinetic energy is just m*v^2 / 2, and that's all we need, let's multiply both ...
*January 27, 2014*

**Chemistry**

Water is composed of 11.2% hydrogen and 88.8% oxygen. what mass of water contains 50.0g of 0xygen?
*January 27, 2014*

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm
*January 26, 2014*

**chemistry**

An unknown substance has a mass of 28.1 g. The temperature of the substance increases by 16.3 degrees Celsius when 176 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances.
*January 26, 2014*

**algebra 1**

A gardner is calculating the perimeter of a rectangular garden, which has a length of 25 feet. The area of the garden is 400 square feet. What is the perimeter of the garden? Write the equation: could it be this? p=400/25+400/25+25+25
*January 22, 2014*

**Algebra 1**

ok thanks
*January 22, 2014*

**Algebra 1**

A jacket costs $45. It is on sale for 20% off. What is the price of the new jacket? Write the equation.
*January 22, 2014*

**Physics**

A spring with a force constant of 5.4 N/m has a relaxed length of 2.63 m. When a mass is attached to the end of the spring and allowed to come to rest, the vertical length of the spring is 3.64 m. Calculate the elastic potential energy stored in the spring. Answer in units of ...
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Algebra 1**

thanks
*January 22, 2014*

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?
*January 22, 2014*

**Eng 2**

Which phrase best describes this type of sentence? Sandy creates her best pieces of art late in the day. A) prepositional phrase modifying an adverb B) adverb modifying other adverbs C) prepositional phrase modifying other prepositional phrases D) preposition with compound ...
*January 21, 2014*

**Math**

I HAD THIS QUESTION TOO. ITS 13mm
*January 21, 2014*

**MATH**

Find the exact values. (a) tan(π/3) = ? (b) sin(7π/6) = ? (c) sec(5π/3)= ?
*January 19, 2014*

**Math**

Rewrite by completing the square x2 + x + 1
*January 17, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin I know the answer is 2.4 but how do u do it
*January 16, 2014*

**5th grade math**

A.. Because then number after 1 have to multiply the previous number (1) so 1*1=1. Then it subtracts the previous number 1-1=0. So the list would be 1,0,0,0,0 so on... So A is incorrect
*January 15, 2014*

**Math**

Which method did u use? I don't know if there is a faster way of doing it then what I'm doing
*January 15, 2014*

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin Is it 2.4?
*January 15, 2014*

**science**

IS PLUTO A PLANET...
*January 15, 2014*

**math crctprep**

The Jones family drove a total of 3584 miles in 9 days. They drove the same number of miles each day. Which of the following is closest to the number of miles they drove each day?
*January 15, 2014*

**Math**

Someone help please
*January 10, 2014*

**Math**

if a b and c are constants and (x+2)(x+b)= x^2+cx+6, what is c
*January 10, 2014*

**Language Arts **

Can you define this in simpler terms: Determine the meaning of words and phrases as they are used in the text, including figurative and connotative meanings; the cumulative impact of specific word choices on meaning and tone. How might this be important in school, work, or ...
*January 10, 2014*

**Math**

if x,y and y-(1/x) are not 0, then (x-(1/y))/(y/(1-x))=?
*January 3, 2014*

**Math**

If n! =1×2×2×...×(n-1)×n,find value of (3!)!/3!
*January 3, 2014*

**Math**

What is the value of 1000^2/(252^2/248^2) How do you do it faster
*January 3, 2014*

**Math**

If x≠0, x/2=y^2 and x/4=4y, then what is the x
*January 3, 2014*

**Math**

1. For all non-zero numbers x and y such that x= 1/y, what is the value of ( x- 1/x)(y+ 1/y)
*January 3, 2014*

**Math**

The ratio of w to x is 4:3, of y to z is 3:2 and of z to x is 1:6. What is the ratio of w to y?
*January 1, 2014*

**Math**

If x : y = 3 : 4 and x : (y + z) = 2 : 5, what is the ratio of x : z?
*January 1, 2014*

**Math**

if company 2 lease/maintenance totals $125,000 for the year and company 1 spends 27% for lease/maintenance, how much is company 1 paying for their lease/maintenance?
*January 1, 2014*

**MMath**

21.45
*January 1, 2014*

**MMath**

Three servers work a party of 30 guests with a meal total of $660.00. Restaurant policy adds a 15% gratuity to the bill for parties of 8 or more. If bartenders receive 15% of the gratuity, bussers receive 20%, and the rest goes to the servers, how much does each server get?
*January 1, 2014*

**statistics **

Solve the problem. Round to the nearest tenth unless indicated otherwise. The amount of rainfall in January in a certain city is normally distributed with a mean of 4.3 inches and a standard deviation of 0.3 inches. Find the value of the quartile .
*December 18, 2013*

**Math help ms sue.**

Dude. This website is meant for a teacher to help you review your homework. Ms. Sue is not obligated to do your homework for you.
*December 16, 2013*

**Simplifying trig expression**

sin(x+90) = ? cos(x+90) = ? Would the first equal like -sin(x)? Would the second equal uh -cos(x)? I'm not quite sure :/
*December 16, 2013*

**SCIENCE? HELP!**

Number one is 4
*December 16, 2013*

**LCM of two numbers?**

the lcm of pi/2 and pi/3 is 6?
*December 15, 2013*

**LCM of two numbers?**

lcm of two numbers pi/3 pi/2 How do I do it? Would it be pi or pi/6? Thanks
*December 15, 2013*

**science **

the honeyguide bird leading the honey badger to the bees hive, both eat meat what is the symbiosis for this
*December 12, 2013*

**Chemistry**

How many grams of K2Cr2O7 (Potassium dichromate) must be used to make 250 ml of a0.125 M solution?
*December 8, 2013*

**business law**

*The below is a scenario in which I have to make an IRAC for (not sure if you know what that is) but read the scenario and see if "Faye" is able to leave legally without ramifications. You must also list the legal rules that apply to this scenario..(for example, if ...
*December 2, 2013*

**physics**

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. ...
*December 1, 2013*

**physics**

A steel section of the Alaskan pipeline had a length of 65.1 m and a temperature of 15.8 °C when it was installed. What is its change in length when the temperature drops to a frigid -31.2 °C?
*November 30, 2013*

**poetry**

Could you help me answer these questions using William Cullen Bryant's poem, "The Prairies?" Thank you so much! I've attached a link to the poem. The poem text is widely available online if you just google the title/author Here are the questions I am ...
*November 27, 2013*

**math**

what would be an example of a parameter? i'm confused. i'm given this problem: How much time do undergraduate students at GMU spend each day reading and sending email? A survey was conducted by a graduate student asking students in the Johnson Center the above question...
*November 24, 2013*

**math**

ITS 40 TONNES
*November 22, 2013*

**Physics HELP!!**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.3 m . The disc spins with an angular speed ω= 200 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal (see figure). The ...
*November 20, 2013*

**Physics**

A woman on a bridge 75.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.00m more to travel before passing under the bridge. The stone hits the water 4.00m ...
*November 19, 2013*

**Algebra**

poop
*November 17, 2013*

**math**

Sheila is going to divide a 36-inch piece of ribbon into 5 equal pieces.She says each piece will be 7 inches long.whats the error?
*November 12, 2013*

**Physics**

A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.390. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.850 rad/s2. (b) At what angular speed (ω...
*November 12, 2013*

**Physics**

A ball is thrown horizontally from the top of a building 45.2 m high. The ball strikes the ground at a point 78.9 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion, initial velocity, and x and y components
*November 10, 2013*

**Physics**

Tom the cat is chasing Jerry the mouse across a table surface 2.4 m oﬀ the ﬂoor. Jerry steps out of the way at the last second, and Tom slides oﬀ the edge of the table at a speed of 4.8 m/s. Where will Tom strike the ﬂoor? The acceleration of ...
*November 10, 2013*