Friday

February 24, 2017
Total # Posts: 49

**chemistry**

What is the ?G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)?

*December 12, 2016*

**Procurement principles**

No

*September 23, 2016*

**maths**

Yes I did,thanks again Ms.

*May 26, 2016*

**maths**

OK I see, thanks you so much.

*May 26, 2016*

**maths**

Yes i did. The figure that contains the digit 1 twice is only the number 11. I hope my answer is right.

*May 26, 2016*

**maths**

how many of the integers from 1 to 200 contains the digit 1 at least twice?

*May 26, 2016*

**maths**

a number is chosen at random from the numbers:1 to 20. Find the probability that the number chosen is a multiple of 2 and a multiple of 5.

*May 26, 2016*

**college algebra2**

4861 sq.in

*February 12, 2016*

**Arithmetic progession**

The third term of an A.P is 10times more than the second term. Find the sum of the eight and fifteen term of the A.P if the seventh term is seven times the first term

*August 13, 2015*

**Economic Math**

Suppose the supply and demand for milk is described by the following equations: Qd=600-100P, Qs = -150+150P, where P is price in dollars . Qd is quantity demanded in millions of gallons per year. A. Create supply and demand tables corresponding to these equations. B. Graph ...

*May 8, 2015*

**math**

(5X+5)^2=125

*April 7, 2015*

**Physical science**

a mass of 10g of sodium nitrate is dissolved in 10ml of water at 80 degrees celsius, at what temperature will it start to precipitate?

*January 6, 2015*

**Math**

an rope 10 feet long is tied to the top of a pole? if the rope is pulled tightly how for form the bottom of the pole should the rope be staked to the ground?

*November 5, 2013*

**math**

question 1- john has nickels quarters and dimes totaling $3.30,21 coins in all,with one more nickel than dimes.How many of each type of coin does he have?

*June 9, 2013*

**math**

Find three consecutive integers such that the square of the third minus the first is equal to 2 more than 5 times the second.

*November 27, 2012*

**pre calculus**

janet worked on a garden shaped like a triangle with a base that is 5 m less than twice the height. If the area of the garden is 90 m^2, how long is the base and the height?

*November 27, 2012*

**Physics**

A force F = (5i − 4j) N acts on a particle that undergoes a displacement Δr = (5i+j)m . (a) Find the work done by the force on the particle. (b) What is the angle between F and Δr?

*October 6, 2012*

**Physics**

A block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of = 30.0° angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.25. (a) Determine the possible values for the magnitude...

*September 26, 2012*

**Physics**

Given the displacement vectors A = (7.00 - 1.00 + 3.00 ) m and B = (6.00 + 5.00 - 3.00 ) m, find the magnitudes of the following vectors and express each in terms of its rectangular components. (a) C = A - B (b) D = 3A + B

*September 26, 2012*

**Physics**

A rod extending between x = 0 and x = 17.0 cm has uniform cross-sectional area A = 7.60 cm 2 . It is made from a continuously changing alloy of metals so that along its length its density changes steadily from 2.00 g/cm 3 to 18.7 g/cm 3 .(a) Identify the constants B and C ...

*September 26, 2012*

**Physics**

A projectile is fired from ground level with an initial velocity of 50m/s and an initial angle of 30degree. Assuming g= 9.8 m/s*2, find: (a) The projectile total time of flight. (b) The maximum height attained (c) The total horizontal traveled (d) The final horizontal and ...

*September 24, 2012*

**Houston community college**

A projectile is fired from ground level with an initial velocity of 50m/s and an initial angle of 30degree. Assuming g= 9.8 m/s*2, find: (a) The projectile total time of flight. (b) The maximum height attained (c) The total horizontal traveled (d) The final horizontal and ...

*September 24, 2012*

**Mura**

Could anyone help me with this question...Mecury has a density of 13.6g/cm^3 at 20°C.What would be the density of mecury at 100°C?

*March 15, 2012*

**Physics**

Assume that you havea mass of 65 kg. I you are standing on the surface of Earth, What is the force of gravitational attraction between you and the earth?

*January 24, 2012*

**math**

1)An object is suspended from two points on the ceiling 25cm apart by two pieces of rope of lengths 27cm and 24 if the object exerts from a downward force 200N then find the tension in each rope 2)An airplane heading north at 550km/h encounters a wind of 175km/h from 32 ...

*September 17, 2011*

**english**

The meanings of blow up,account for,call off,talk into and drag on.

*September 15, 2011*

**biology**

describe the events that take place in the eye when you come from a dark room to the outside where there is light

*September 15, 2011*

**physic**

c)I think maybe $8.00 is right .A fossil's monetary worth is truly only equal to what a collector is willing to pay for it. Still, there are some key things to consider in order to know how to price a fossil, whether you are a collector or a dealer. I think maybe $8.00 is ...

*April 16, 2011*

**social studies**

what happened as a result of the removal of the priest

*February 22, 2011*

**chemistry**

give enthalpy profile diagrams to illustrate endothermic and exothermic reactions. include an explanation of cocepts such as enthalpy change, activation energy and catalysts.explain how the process of bond breakage and formation determine the enthalpy change of a reaction ...

*February 2, 2011*

**CHEMISTRY**

thax

*February 1, 2011*

**CHEMISTRY**

GIVE ENTHALPY PROFILE DIAGRAMS TO ILLUSTRATE ENDOTHERMIC AND EXOTHERMIC REACTIONS.INCLUDE AN EXPLANATION OF CONCEPTS SUCH AS ENTHALP CHANGE, ACTIVATION ENERGY AND CATALYSIS. EXPLAIN HOW THE PROCESSES OF BOND BREAKKAGE AND FORMATION DETERMINE THE ENTHALPY CHANGE OF A REACTION ...

*February 1, 2011*

**math**

using rounding or compatible numbers,which numbers would you choose to estimate the exact product of 25 times 25.

*January 21, 2011*

**8th grade**

Can't wait for college then the NBA.

*August 24, 2010*

**Precalculus**

solve the equations for x a) e^2x - e^x - 30 = 0 b)1-3/n^x = 5

*July 5, 2010*

**pre algebra**

13d = _ min

*April 3, 2010*

**chemistry**

1.write the balanced equation 2.find the number of moles of N2O 3.find the molar ratio 4.if the ratio is 1:1 than the number of moles for N2O and oxygen will of the same value 5.find the mass using n=m/MM 6. rearrage the equation to get m=n*MM and you will get the mass of ...

*March 26, 2010*

**Chemistry**

Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:----- Molecular Formula:-----

*March 25, 2010*

**Math**

If a+b is less than c+d, and d+e is less than a+b than e is (1)less than c (3)less than d (2)equal to c (4)greater than d

*September 20, 2009*

**history**

What elementary school or high school did Paul Dunbar, the poet, go to?

*February 26, 2009*

**6th grade geometry**

list the next 7 polygons after pentagon..

*February 25, 2009*

**physics**

thank you

*March 4, 2008*

**physics**

a cork floats on the water as a water wacve passes by, what happens to the cork? will the cork's vibrational frequency be related to the water wave's frequency and if so, how?

*March 4, 2008*

**Pre-Algebra**

11Y^2-7Y+12

*March 4, 2008*

**Pre-Algebra**

-3W-6R+6

*March 4, 2008*

**Pre-Algebra**

-7P+21+2P=24 -5P+21=24 -5P=3 P=-3/5

*March 4, 2008*

**Biology**

If water were not a polar molecule and could not form hydrogen bonds, how would this change the structure and density of ice? Why would change? How would this affect the organisms living in lakes and ponds? 1. It would be heavier than water and sink. 2. If ice were on the ...

*November 14, 2006*

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