# Posts by Megan

Total # Posts: 1,219

Chemistry
Enthalpy changes: H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the value on delta H for the reaction: H2(g) + H2O2(l)----> 2H2O(l)

math
N =197

physics
you take 250.0 g of ice from the refrigerator at -8.00 degrees celsius. how much heat does it take to warm it to room temperature, 20.0 degrees celsius?

11TH Geometry
With the image of O(-2,-1) after 2 reflections. one across the line y=-5 and line x=1

Chemistry
2Na+F2=2NaF if 20.0 g of sodium is used what mass of sodium fluoride could be produced assuming that fluorine gas is unlimited

chemistry
2C2H6+702=4CO2+6H20 how many grams of oxygen are required to completely burn60.0g ethane (C2H6) show work Using the above equation how many Lof 02 are required to burn 20.0Lof ethane thank u soo much this is for a test

chemistry
Mg(ClO32=MgCl2+3O2 12.omolMg(ClO3)2produces molMgCl2and MolO2 3.00 molofMg(ClO3)2produces what mass of O2

ALGEBRA
first off, I like to circle to common ones... so I first circle the two x's. Since we are subtracting, it would be x-x which is 0. Thenm i circled the 2y's. It would be 2y - (-2Y) aka 2y +2y which is 4y. Then, -2z-2z which is -4z. it would be 0+4y-4z and you obviously ...

chemistry
How many moles of ions are contained in 1.4 L of a 1.6 M solution of Mg(NO3)2?

chemistry
How many moles of ions (cations and anions) are contained in 1.2 L of a 1.9 M solution of KCl? KCl K+ + Cl-)

chemistry
What is the molarity of each kind of ion in a solution of magnesium chloride that contains 29.0 g of magnesium chloride dissolved in enough water to make 1.73 L of solution? MgCl2 Mg2+ + 2 Cl-

ap chemistry
A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr 3+ and a gold electrode in a solution that is 1.0 M in Au 3+ . a) Provide the half cell reactions for each of the electrodes. b) Which is the anode and which is the cathode? How did you decide? c) Give an ...

Geometry
Find the center of the circle using the equation provided. Please show work! x^2 + y^2 = 16

geometry
Give an example of an infinite set.

physics
Elena, for some reason I'm getting an answer of -3 (8.00 x 10^-12) x (d-x)^2 = (6.00 x 10^-12) x (x^2) (d-x)^2/x^2 = 7.5 x 10^-1 (d-x)(d-x)/x^2 = 7.50 x 10^-1 x^2-x+0.25/x^2= 7.50 x 10^-1 then I get x = -3 Can you help! I'm not sure where i am going wrong.

physics
Two spheres with charges of 4.00nC and 3.00nC are placed 0.500m apart. At what point between the two charges must the third charge of 2.00cN be placed so that the net electrostatic force acting on this charge is zero?

Precalc
Evaluate Tan[(3pi-70000pi)/2]

BioChem
Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution

chemistry
Hydorgen peroxide may be prepared by the following reactions: 2NH4HSO4 ---> H2+(NH4)2S2O8 (NH4)2S2O8+2H2O ----> 2NH4HSo4+H2O2 What mass of ammonium hydrogen sulfate, Nh4HSo4 is initially required to prepare 2.00 mole of H2O2? What mass of H2O is required? I have checked ...

Chemistry
What is the equilibrium equations that result when solid NH4F is dissolved in sufficient water to produce 5.0 mL of 0.5M NH4F solution? How would the addition of 5 drops of 0.1M HCl affect the equilibrium system. Give an explanation. How would the addition of 5 drops of NaOH ...

college algebra
x+2 inches

math
at camp, miriam learned how to use a pottery wheel. she can make 3 bowls in 2 hours. how long will it take her to make a set of 12 bowls?

Math
15/8-9/4=1 1/2

College Algebra
Let U = {8, 9, 10, 11, 12, 13, 14}, A = {8, 9, 10, 11}, B = {8, 9, 12, 13}, and C = {10, 12, 14}. List all the members of the given set. (Enter your answers as a comma-separated list.) (A ∪ B) ∩ C

Physics
1.96 s

Algebra 2
A bag contains five red marbles and three blue marbles. In how many different ways can two red marbles be drawn if the first marble is not returned to the bag before the second marble is drawn?

Algebra 2
In how many different ways can six people be seated in a six-passenger van?

Algebra 2
The nurseryman brought six different varieties of trees to plant in six locations in the park. In how many different ways can he plant the trees?

Algebra 2
The artist, R. Locklen Jones, selects three paintings from a collection of six to display in a row. How many different arrangements of the display are possible?

Algebra 2
The red spinner has six equal sectors labeled with numbers 1 through 6. The blue spinner has four equal sectors labeled with letters A, B, C, and D. Find the probability of spinning the two spinners and getting a 5 with a B?

Algebra 2
A box contains 4 blue golf tees, 2 red ones, 1 yellow tee, and 3 white ones. Two tees are randomly drawn from the box. Find the probability of choosing a blue tee followed by a red one, if the first tee chosen is returned to the box before choosing the second tee?

Algebra 2
Two cards are randomly drawn from a standard deck without replacing the card after the first draw. Find the probability of drawing a spade followed by a heart?

Algebra 2
The numbers 1 through 9 are written on slips of paper and placed into a hat. Two slips are randomly drawn. If the first slip of paper is not returned to the hat after it is drawn, find the probability of getting a six and then a three?

math
what does z equal in the equation 3z minus z equals 24

Physics 2
A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?

Physics 2
A wire has a length of 4.52 x 10-2 m and is used to make a circular coil of one turn. There is a current of 7.94 A in the wire. In the presence of a 8.04-T magnetic field, what is the maximum torque that this coil can experience?

Geometry Are these two triangles similar? Thanks!
Are these two triangles similar? How do you know? There are two triangles HMG and JMK They are connected at the top point at M H is on the bottom left, G is on the bottom right, and M is at the top for triangle HMG For triangle JMK J is on the bottom right and K is on the ...

What was the main effect of the repeated exiles of the Jews?

Math
Find two numbers on the 30-board(the factor game) with the greatest product.

Chemistry
Determine the grams of hexane that will react exactly with 22 g of oxygen. Show all working please. Thank you.

Chemistry
Calculate the moles of hexane required to form 150 g of carbon dioxide. Please show all working. Thank you.

Africa
Why did Greg mortenson start pennies for peace

literature.......
Yes i like it. Its really good. Im supposed to make a realistic fiction story too and i want to do it by myself with a little help. i love writing but not this genre i like making stuff up! Good luck. :)

Geometry
Find the area of a rhombus with a 45 degree angle and sides of 12m long?

math
what three consecutive months would have the least number of days

consumer math
did you ever figure this out? what was the answer?

Algebra
Six angles in a hexagon are fit together.It looks like this... _____ /\ / \ /_1\6/_5\ \ 2/3\4/ \/____/ I try to draw the picture as best as I can but try to imagine. It's a hexagon with the six angles labeled near the center of the hexagon. The options given to this ...

math
A statue is made of a mixture of copper and zinc in a ratio of 11:4 (copper to zinc). If the weight of the statue is 3165 pounds, what is the weight of the copper?

math
The perimeter of the triangle is 40 inches. If you wanted to construct a similar triangle with a perimeter of 50 inches, what would be the length of the shortest side of the triangle?

Math
• 1 mile=5280 feet • 1 foot=12 inches • 5280 X 12 = 63,360 inches in 1 mile • 400 x 63,360 = 25,344,000 inches in 400 miles (this is how many inches SLC and Reno are apart today. • 250 x 63,360 = 15,840,000 inches in 250 miles (this is how many inches ...

algebra
y=1/2x-1

Physics
In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the ...

chemistry
Calculate the number of moles in 35.7 grams of Na3PO3

Calculus
What exactly is an integral? I understand it is the area under a curve but what does it pertain to?

Math
How do you find the exact value of: 4sin 60degrees - 3tan 135degrees

geometry
a company logo is a rhombus with4-cm sides and angles of 60 degrees and 120 degrees. find the angle measures and side lengths if the logo is changed as follows

Alebra
Kathy works at an optical store selling eyeglasses. Each week she earns \$180 plus a 2% commission of her total sales for the week. Next week she wants to earn at least \$350. 1. Write an inequality that represents the dollar amount of eyeglasses kathy must sell to earn at least...

I need the answer to this ASAP

Physics
A vessel contains 10 kg of water and an unknown mass of ice at 0°C. The temperature of the vessel is monitored for 60 minutes. During the first 50 minutes, the temperature remains at 0°C. For the next 10 minutes, the temp steadily increases from 0°C to 2°C. a. ...

physics
A track star goes in the long jump at 10 m/s at 37 degrees above the horizontal. What is the magnitude of the horizontal displacement?

Physics
How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?

Physics
How can one find the magnitude and the directions of a resultant if Vector A is 35N @ 60' NE, and Vector B is 50N @ 20' NW?

math
18a^3 + 30a^2 / 3a

math
18a^3 + 30a^2 / 3a

chemistry
What mass of KNO3 in grams would be required to prepare 0.6 liters of a 1.8 M KNO3 solution?

Calculus
A storage tank used to hold sand is leaking. The sand forms a conical pile whose height is twice the radius of the base. The radius of the pile increases at the rate of 2 inches per minute. Find the rate of change of volume when the radius is 5 inches.

geometry
I'm so confused...can someone please help??? I need to find the orthocenter of the triangle with the vertices R(-4,8), S(-1,5), T(5,5)??? How do you get 'y' for this problem?

world history
I have the same question on my test,I have my book in front of me and yes, it is D.

Chemisty
Iodine monobromide and ammonia react to produce nitrogen triiodide and ammonium bromide. (a) Balance the chemical equation for this reaction. (Use the smallest possible whole numbers. Enter 1 where appropriate. Do not leave any answer box blank.) . IBr(s) + . NH3(g) . NI3(s...

Science
Thermite is a mixture of iron(III) oxide and aluminum powders that is used in some countries to weld railroad tracks. It is a spectacular reaction to yield solid aluminum oxide that floats on the molten iron. When cooled, the iron is ground smooth and even with the rest of the...

Science
Al(OH)3(s) + HCl(aq) AlCl3(aq) + H2O(l) How many moles of HCl are required to react with 0.470 g of Al(OH)3 in the above unbalanced reaction? Use at least as many significant figures in your molar masses as in the data given. mol HCl What mass of HCl is required? How many ...

math
5.3+4=3.24-2.7

math
5.3+4=3.24-2.7

statistics
A nationwide study indicated that 27% of adults said that chocolate was their favorite ice cream flavor. A simple random sample of 150 adults is obtained. A.) Describe the sampling distribtuion of p, the sample proportion of adults whose favorite ice cream flavor is chocolate...

calculus
Question 1 The figure below shows the rate of change of the quantity of water in a water tower, in liters per day, during the month of April. If the tower had liters of water in it on April 1, estimate the quantity of water in the tower on April . Round your answer to the ...

Logic- Formal Proof
I need to solve a proof and I cannot figure it out. The instructions say only that I will have to use subproofs within subproofs. Premises: A or B A or C Conclusion: A or (B and C)

geometry
what is the slope of the line determined by the equation 2x+y=5?

fraction 10-1 math
camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?

fraction 10-1 math
camp big trees has 3 red canoes and 4 blue canoes. what fraction of the conoes are red ?

Algebra
Thank you so much!! It really helped me understand!

Algebra
Rationalize the denominator: 5 /4-squareroot 5 (five over four minus square root five) Please explain

Algebra
Thank you!

Algebra
Two hoses are connected to a swimming pool. Working together, they can fill the pool in 4 hr. The larger hose, working alone, can fill the pool in 6 hr less time than the smaller one. How long would it take the smaller one, woking alone, to fill the pool? Please explain

english
what is an appositive phrase?

math
write a matrix for x-y=8,-2x-5y-6z=-27, 9x+10y-z=54

Culture Diversity
I have a paper due soon where I need to interview three Japanese Americans. Could any Japanese American answer the following questions for me? I would greatly appreciate it! If you don't feel comfortable answering some of them just leave them blank, Thanks! What is your ...

physics
Consider the window (of area 0.68 m2) of an airplane. If the pressure inside the plane is atmospheric pressure, while the pressure outside is 31 % of Patm, find the force on the window. Ignore the velocity of the airplane (i.e., ignore Bernoulli’s effect).

Physics
If the pressure outside a window drops by 9.1%, while the pressure inside does not change, what is the force on the window? Assume that the area of the window is 2.3 m2.

Physics
Correction h + (d^2)/4h

Physics
h + (d^2)/h

Find the solution to the following system of two linear equations, if it has a solution. x+3y=4, 3x+9y=12

Math
I don't think I follow....

Math
1) Find the solution to the following system of two linear equations, if it has a solution. 2x-y=3, -x+y=1 2Find the solution to the following system of two linear equations, if it has a solution. 2x+y=4, x+3/2y=3

math
When is an exact number needed and when is an estimate okay?

World History
Everybody is saying the answer is Traditional Brahman elites,but that is so wrong. I ahve my history book here in front of me, and it says the answer is The Buddhist clergy .

physics
A military gun is mounted on a railroad car (m = 1590 kg) as shown in Figure P7.34. There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 26 kg with a velocity of 280 m/s at an angle of 28° ...

physics
How long does it take an automobile traveling 62.0 km/h to become even with a car that is traveling in another lane at 37.5 km/h if the cars' front bumpers are initially 138 m apart? in seconds

Calculus
Let A be the region bounded by the curves y = x^2-6x + 8 and y = 0. Find the volume obtained when A is revolved around the Y-AXIS

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