Tuesday

March 31, 2015

March 31, 2015

Total # Posts: 430

**chemistry**

Calculate ▲U,▲H, ▲S, ▲A and▲G in expanding 1 mole of ideal gas at 25 ° c from 10 to 100 dm cubed. (5marks )
*March 21, 2015*

**chemistry**

Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)
*March 21, 2015*

**Inorganic Chemistry**

Which of the following species contain an inversion center? Choose all that apply. SeF6 [IF4]- SnF4 InH3
*March 5, 2015*

**Inorganic Chemistry**

Which of the following molecules contain a C3 axis but not a σh plane? AlCl3 SeO3 SbBr3 PCl3
*March 5, 2015*

**Inorganic Chemistry**

Which of the following species contain a C4 axis and a σh plane? Choose all that apply. [ICl4]- SiCl4 XeF4 GeH4 [PO4]3
*March 5, 2015*

**math**

Juanita wants to give bags of stickers to her friends. she wants to give the same number of stickers to each friend. she's not sure if she needs 4 bags or 6 bags of stickers. How many stickers could she buy so there are no stickers left over.
*February 23, 2015*

**Science**

please help
*February 23, 2015*

**Science**

Which of the following is an indication that a planet may exist near a distant star A. the star varies in temperature B. The star has a very slight back and forth motion C. the star has very strong gravity D. Radio wave activity increases near the star I think the answer is A
*February 23, 2015*

**Computers**

thank you I hope it is correct
*February 20, 2015*

**Computers**

my answer is also B
*February 20, 2015*

**Computers**

What is one important feature of an AUP? A. a list of all available courses B. a clear outline of the consequences of violating the policy C. a permissive approach to internet usage D. a calendar for the academic year
*February 20, 2015*

**organic chemistry**

Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with ...
*February 20, 2015*

**organic chemistry**

Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with ...
*February 19, 2015*

**chemistry**

suppose 0.0139g of HNO3 is dissolved in 625 mL of aqueous solution. what is the pH
*February 15, 2015*

**math**

A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads
*February 7, 2015*

**statistics**

A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads
*February 7, 2015*

**Organic Chemistry TLC Chromatography**

If you have 5.6 ml of 95:5 ethyl acetate, how many ml of 85:15 ethyl acetate can you make? Assume unlimited supply of pure ethyl acetate.
*February 3, 2015*

**social studies**

the mediterranean sea
*February 3, 2015*

**mathematic**

a bag contains 3rdmarbles, 2white and 3green a boy takes at one marble at random. what is the prob that it is either red or white?
*February 2, 2015*

**Chemistry**

How many resonance structures do these following acids have? H2CO3-carbonic acid H3PO4-phosphoric acid H2SO4-sulfuric acid HNO3-nitric acid CH3COOH- acetic acid CH2ClCOOH- chloroacetic acid CHCl2COOH- dichloroacetic acid CCl3COOH- trichloroacetic acid
*November 4, 2014*

**Chemistry**

Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, dont leave a step out! Thank You!
*November 3, 2014*

**Math**

Find the linear approximation of f(x)=ln x at x=1 and use it to estimate ln 1.12. L(x)= ? ln 1.12 \approx ?
*November 1, 2014*

**calculus**

i got maximum to be -¼ and minimum to be -1 and i got it wrong
*October 31, 2014*

**science**

what is the answer to number 2
*October 27, 2014*

**algebra**

Simplify the expression below completely ( x^2-x-30)/( x^2-25)
*October 27, 2014*

**algebra**

Simplify the expression below completely ( x^2-x-30)/( x^2-25)
*October 27, 2014*

**Physics**

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 810 m/s2 and the vertical or y component of its acceleration is 910 m/s2. The ball's mass is 0.32 kg. What is the ...
*October 22, 2014*

**physics**

In a cargo plane, the center of gravity must be between the front and rear landing gears in order to maintain a torque equilibrium. The front landing gears help counteract the torque provided by the rear landing gears in this case. A jet transport has a weight of 1.00 ✕...
*October 19, 2014*

**maths**

How much will a buyer pay for 15kg of fish if 1kg costs $435.65‚approximate your awser to the nearest dollar
*September 9, 2014*

**Math**

Ravi is thinking of a 2 digit number.The number is between 40 and 50.the sum of digits in tens and ones place 13. What is the number that Ravi is thinking of? Answer 11 am i rite
*September 3, 2014*

**math**

A random sample was taken from the normal IQ population, which has μ = 100 and σ = 15. ALL INFORMATION IS GIVEN: We gave a random sample of 25 undergrad students (n = 25) a new study pattern to see if it increases their IQ score. The samples mean IQ score is 112. The...
*July 9, 2014*

**Trig**

A 24-foot ladder is placed against a building. The building is perpendicular to the level ground so that the base of the ladder is 11 feet away from the base of the building. How far up the building, in feet, does the ladder reach? Round to nearest hundredth.
*May 19, 2014*

**physic**

In a serious accident, a nuclear power plant's reactor vessel cracks, and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat
*May 6, 2014*

**physics**

A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? c_metal =____ J*kg*C?
*May 4, 2014*

**Math**

Which relation is NOT a function? Y=0 X=2 Y=2x Y=x+2
*February 6, 2014*

**physics**

A 1500 kg car at rest rolls down a hill inclined at 10 degrees with the horizontal. A 400 N friction force opposes its motion on the inclined plane and a 600 N on the horizontal surface a) how fast will it be moving at point B b) how far from point C will it travel before ...
*January 21, 2014*

**ENGLISH **

Select the complete subordinate clause (including all modifiers). I honestly did not know that you felt so strongly about the subject. A.I honestly b.I honestly did not know c.did not know that you d.that you felt e.that you felt so strongly f.that you felt so strongly about ...
*January 14, 2014*

**Pre-Calculus**

Write an algebraic expression in x for sec(arcsin(x/sqrt(x^(2) +4)))
*January 8, 2014*

**College Algebra**

4^-1.5
*December 11, 2013*

**Statistics**

How do the 3rd grade boys’ weight in Principal Ben’s school compare to the national average (mean weight = 90, sd =15)? Provide the IV, DV, and best method of analysis.
*November 14, 2013*

**social studies**

Which iroquois nations lived the farthest from new york city?
*October 9, 2013*

**chemistry**

What are standard temperature and pressure? Why was a standard needed?
*October 2, 2013*

**Physics**

A car is traveling at 24.4 m/s. If the driver has a reaction time of 1 second, what will be his stopping distance if his car slows down at 8 m/s2?
*September 19, 2013*

**Park University**

The number of arrivals per period is distributed according to the Poisson with an expected value of 0.75 unit per period. The cost of waiting per unit per period is $3.20. The facility cost for serving one unit per period is $5.15. What expected service rate should be ...
*September 15, 2013*

**algebrae**

the price of gas in $3.72 per gallon. if Mayra has $20.00, how many gallons of gas can she buy?
*August 12, 2013*

**algebrae**

joey and three of his friends go to the movies. Each ticket costs $7.25. Write an algebraic expression to find to find the total cost of the tickets.
*August 12, 2013*

**Math (Combinatorics)**

Awesome, thanks!
*June 30, 2013*

**Math (Combinatorics)**

In how many ways can I place 5 different beads on a bracelet if flipping or rotating the bracelet does not change the order of the beads?
*June 30, 2013*

**math**

there are 100 people in the u s senate 18 are on the foreign relations committee how many ways are there to select members for this committee if party affiliation is not a issue
*May 24, 2013*

**life orientation**

Sources of environmental health
*May 22, 2013*

**Science(Chemistry)**

Suppose that 23 mL of 0.6 M K2CrO4(aq) reacts with 13.7 mL of AgNO3(aq) completely. What mass of NaCl is needed to react completely with 38.5 mL of the same AgNO3 solution? Answer in units of g
*April 18, 2013*

**anatomy physiology/check please**

Muscular dysgenesis or dysgeny is a lethal, recessive, genetic disease of mice that is caused by a mutation in the mdg gene. Skeletal muscles from dysgenic mice are paralyzed and the animals die shortly after birth. You are a research scientist interested in the finding the ...
*April 4, 2013*

**math**

find mean median and mode of 10 1 10 15 1 7 10 10 1 6 13
*April 2, 2013*

**GEOMETRY**

ANGLES X AND Y ARE SUPPLEMENTARY ,AND THE MEASURE OF ANGLES X IS 24 DEGREES GREATER THAN THE MEASURE OF ANGLE Y. FIND THE ANGLE MEASURES.
*March 20, 2013*

**Physics**

not sure
*March 18, 2013*

**Chemistry**

I have Kc= [(0.065)(0.130)^2]/(0.190^2) Kc= 0.030429 This answer was incorrect. Can you please help correct me?
*March 8, 2013*

**Chemistry**

What is the correct answer?
*March 8, 2013*

**math**

Trent earned $28,500 last year. He paid $8,265 for rent. What percent of his earnings did Trent pay for rent
*February 26, 2013*

**music**

Jazz originated in New Orleans from traditional african-american music. the earliest use of the modern blues scale was in the mid 1800's.
*February 21, 2013*

**science**

B No A tapeworm eats by absorbing predigested food and nutrients from the intestinal contents of its host through its outer covering or tegument
*February 21, 2013*

**Spanish**

Can you help me unscramble these two words? ngtialceoo, birol
*February 19, 2013*

**science**

A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 15 kg cart is moving at 3.0 m/s afterward. How fast is the 10.0 kg cart moving?
*February 16, 2013*

**math**

jewelry marked 14 karat gold is 14/24 pure gold. what is the percent
*February 11, 2013*

**social studies**

in what ways could the natural barrier of the himalayas have both helped and hurt the cicilization of the indus river valley
*February 6, 2013*

**chemistry**

How much heat (in cal) is necessary to heat 27.0 mL of octane (s= 0.526 cal/g ®C ; d = o.703 g/mL ) from 50.6 ®C to 67.2 ®C? I understand the Delta T is = 16.6®C But I don’t know what d stands for (density) or how to apply to the formula.
*February 3, 2013*

**Algebra**

A rectangle was 25 cm longer than it was wide. A new rectangle was formed by decreasing the length by 6 cm and decreasing the width by 5 cm. The area of the new rectangle was 585 cm squared. Find the dimensions of the original rectangle.
*January 29, 2013*

**phy**

Tinny insects such as mosquitoes can seat on the surface of water.which physical principle makes this possible ?
*January 24, 2013*

**Literature**

I need a good Participle Phrase sentence in the story of Le Morte D' Arthur, Can anyone help me??
*January 24, 2013*

**Physics**

I believe the period time will be tripled from the original time at 2.55s because the distance that the spring was puled down was 3 times the original length. Answer= 2.55 seconds
*January 24, 2013*

**Physics**

A 2.2m of steel wire hangs vertically down from a support. A 1.5m length of brass wire of the same diameter is attached to the lower end of the steel wire.when a 10 kg mass is attached to the lower end of the brass wire a total extension of 0.05 m is produced. by how much does...
*January 10, 2013*

**chemistry**

What volume of oxygen at s.t.p is required for the complete combustion of methane according to the following equation. CH4 2O2= CO2 2H2O
*January 10, 2013*

**Science math**

8; 2,622 g
*January 7, 2013*

**calculus**

A water heater in the shape of a circular cylinder is standing vertically, resting on one of the round ends. The tank is 60 inches tall and has a volume of 30 gallons. If water is flowing into the tank at the rate of 5 gallons per minute, at what rate is the level of the water...
*December 27, 2012*

**Math**

The graph of the equation 2x+6y=4 passes through point (x,-2). What is the value of x?
*December 13, 2012*

**statistics**

Solution My mean is 175.5 My standard deviation is=90.57 Sample=25 So the probability is Formula to be used: P(X>190)=P((X-mean)/s sqrt of my sample is = 5 (190-175.5) / 90.57/5) 14.5 / 18.114 calculator says 0.8004858120790548746825659710721 I check the z-table and I see...
*December 11, 2012*

**physics**

134 g of water at 7°C is added to ice at 0°C. If the final temperature of the system (which you can assume is isolated) is 0°C, determine HOW MUCH ICE MELTED. The specific heat of water is 4186 J/kg·°C. The latent heat of fusion for H2O is 335,000 J/kg.
*November 14, 2012*

**Physics**

The answer is 0
*November 14, 2012*

**Physics**

Steam of mass 11.0 g at 100°C is added to 114.8 g of ice at 0.00°C. Find the final temperature of the system.
*November 14, 2012*

**Math**

Maria painted 2 thirds of her picture in 3 fourths at this rate what is the total time it would take her to finish the whole painting
*November 5, 2012*

**english**

preposition
*October 9, 2012*

**english**

in sentece, what part os speech is from? The pistures fell from the table.
*October 9, 2012*

**english**

The pictures fell from the table.What part of speech is from in sentence?
*October 9, 2012*

**english**

in sentence, what part of speech is diplomacy? Diplomacy is the best article.
*October 9, 2012*

**physics**

A group of engineering students constructs a slingshot to launch water balloons. The angle of launch is 30° and the initial velocity of the balloon is 14 m/s. The students launch a balloon from the roof of a building and the balloon lands 42 m away from the building. How ...
*September 21, 2012*

**math**

how do i simplify the following? -19-11a+9+16 thats negative 19 minus 11a plus 9 16. please help!!!
*September 17, 2012*

**Physics**

A toy train is moving on a track from right to left. You are told that work is the dot product of force and displacement. In what direction would you apply a force so that you do the most negative work on the train? a)You would apply a force that is in the left to right ...
*September 10, 2012*

**Physics**

Which of the following statements related to vectors is not correct? a) A "one way" road sign is an example of a vector. b)A vector is a physical description that includes both a number and a direction. c)If someone states, "Joe is traveling at 30 miles per hour...
*September 9, 2012*

**math7th**

28a^11b^7 divided by 4a^3b^2
*September 6, 2012*

**math7th**

x/2 + 11 = -25 x/4 - 5 + 13
*September 5, 2012*

**physics**

Indiana Jones is swinging from a rope. The distance between the pivot point and his center of mass is 31.00m. He begins swinging from rest at an angle theta=20.00 degrees. Assuming that Indiana and the rope can be treated as a simple pendulum, what is the value of theta after ...
*June 27, 2012*

**physics**

A uniform horizontal bar of length L = 5 m and weight 243 N is pinned to a vertical wall and supported by a thin wire that makes an angle of theta = 39o with the horizontal. A mass M, with a weight of 300 N, can be moved anywhere along the bar. The wire can withstand a maximum...
*June 27, 2012*

**physics**

A 5.0 kg block of some unknown material is suspended from a spring scale and submerged in water.? The spring scale reads 39.3 N. What is the specific gravity of the block? I get 5051.5 kg/m^3 but its incorrect.
*June 27, 2012*

**Chemistry**

If 2.80 kJ of heat is needed to raise the temperature of a sample of metal from 10.°C to 27°C, how many kilojoules of heat will be required to raise the temperature of the same sample of metal from 40.°C to 58°C?
*June 21, 2012*

**physics**

x=x0+v0t+1/2at^2. Assuming that x0=0, a=2, and x=h, solve for t in terms of initial v and h? x0 mean initial value of x same with v0
*June 8, 2012*

**math**

A 4'' diameter round pizza with area As and a 12'' diameter round pizza with area Ab. What is the ratio Ab/As? How many times bigger is the larger pizza?
*June 8, 2012*

**physics**

Consider the equation -mv0 +3mv0 = 4mvf. Where m and v0 are constants, Solve for vf. Simplify answer.
*June 8, 2012*

**math**

If an object with the weight of 70 newtons requires 37 newtons to start sliding, what is the value of the coefficient of the static rounded to the nearest tenth?
*May 13, 2012*

**math**

a box has a volume of 546cm3 and a surface area of 422cm2 what is the length, width, and height?
*May 6, 2012*

**Math 3**

Indicate in standard form the equation of the line passing through the given points. G(4, 6), H(1, 5)
*May 2, 2012*

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