Posts by jane

Total # Posts: 1,649

Chemistry
How many moles of aluminum oxide can be produced from 12.8 moles of oxygen gas (O2) reacting with excess aluminun (Al)? useing this equation: ---- I don't get how to do these? 4Al(s) + 3O2--> 2Al2O3(s)

Chemistry
How many moles of silver nitrate are needed to produce 6.75 moles of copper nitrate (CU(NO3)2) upon reaction with excess copper by useing this equation: 2AgNO3(Aq) + Cu (s)-->2Ag(s)+Cu(NO3)2 (AQ)

Chemistry
How many grams of water will be produced if 32.0 g of nitrous oxide are also produced in the reaction? useing this equation: NH4NO3 (s)--> N2O (g) + 2H2O (g)

Chemistry
Use the equation to determine what volume of nitrous oxide can be produced from the decomposition of o.55 moles of ammonium nitrate useing the equation: NH4NO3 (s)--> N2O (g) + 2H2O (g)

chemistry
How many moles of carbon monoxide are needed to react completely with 1.75 moles of iron oxide? based on this equation: Fe2O3(s)+3CO(g)--->2Fe(s)+3CO2(g)

chem
1,3,5 will do it

Statistics
10.14

Maths
The product of two positive consecutive odd numbers is 255. What are the numbers? Please write this problem in quadratic equation form please

chemistry
A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmhg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure in torr?

chemistry
HOW MANY LITERS OF H2 must react to produce 75.0g of PH3

Stats
With technology, is it necessary to use one sample z test for large sample instead of binomial testing?

geometry
11.54cm

chemistry
according to this law ,as magnitude of chrages increases,what happens to the strength of attraction?

Chemistry
What makes Permanganate such a good oxidizing agent?

Material Science
1).Does more grain boundaries result in a higher ultimate tensile strength? 2).Does an increase in stiffness of a material result in a higher modulus?

Science
If you were to move the load by applying force from the top, what kind of machine might be the most appropriate to lift the load 5 cm?

alg I
Yellow, green, and red chips are placed in a bag. The odds against pulling a green chip are 2/5. What is the probability of pulling a green chip?

Physics
Two sounds have measured intensities of I1 = 100 W/m2 and I2 = 300 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2?

alegebra
a 210 ft. long rope is cut into 3 pieces. the first piece of rope is 3 times as long as the second rope. the 3rd piece of rope is 2 times as long as the second piece of rope. What is the lenght of the longest piece of rope?

geometry
The diagnol of a rectangle is 20 inches. The width is 4 inches shorter than its length.

Microeconomic

Microeconomic
If your marginal utility from your last session with your personal trainer is equal to the price she charged you, then: Thank you-Jane

maths
Facrt

maths
Need help to know what to do: solve the equation 9/(x=7)=4/(x-3) My book tells me to cross multiply, then move all the terms in x and the terms without x on separate sides of the equation. then divide by the coefficient of x. How do i do this? I don't understnd it what ...

geometry
Julian is interested in building a new house. Three architects have given him plans. The first plan is for a house that will be 2,250 square feet. The total cost of the house will be \$281,250. The second plan is for a house that will be 2,400 square feet. The total cost of the...

chemistry
Determine how many milliliters of 0.102M NaOH solution is needed to neutralize 35.0mL of 0.125M H2 SO4 solution.

science
what is the human life cycle

physics
Calculate the gravitational force between the Sun and Neptune. The mass of the Sun is 1.99×1030 kg. The mass of Neptune is 1020×1023 kg. The distance between them is 450×1010 m.

physics
I am confused because the answer should be in mi/s.

Physics
A rod with cross-sectional area A and length L is made from a material with a Young's modulus of Y. This rod could be considered an extremely stiff spring with some spring constant k. Find an expression for k in terms of the other quantities.

Maths
circumference = 2 * pi * r = 2 * 22/7 * 7 = 44 cm 1 km = 1,00,000 cm 44 km = 44,00,000 cm revolutions to be made = 44,00,000/44 = 1,00,000

Ethics
thanks

Ethics
What moral is the fondness of war related to? I'm trying to sum it up in a concise phrase or word but I can't think of the right one. Ambitiousness? Belligerent? Thanks

precalculus
oops! i mean HYPERBOLA FORM

precalculus
Hi does anyone know how to solve this equation into parabola form? thanks x^2 + 2xy +3y^2 = 9

math
He had a lot on his mind

math
how tow write two word phrases for t/30

Chemistry
Thank you, I estimated the surface tension to be around 72.4 dynes/cm.

Chemistry
What is the surface tension of water at 23 degrees Celsius?

Chemistry
How much of a 500 ml bottle of 1.00 molar KCI solution should be diluted with deionized water to give 200.0 ml of a 0.100 molar solution

world history
a b a b c d a c d d c a a b c b b c a c

Science
60

Geometry
Thank you!

Geometry
If U is between T and B, find the value of x and the measure of TU. TU=4x-1, UB=2x-1, TB=5x Please help!

social studies
Where was indiana's first battle in the civil war

Physics
Does anyone know how to find the electric force of two objects if I have the distance and mass of the one of the objects? Thanks.

Chemistry--Quick Question
Sorry correction! I forgot to include one word I meant scientific knowledge The first step in acquiring scientific knowledge is often the observation or measurement of some aspect of nature. a. True b. False

Chemistry--Quick Question
The first step in acquiring knowledge is often the observation or measurement of some aspect of nature. a. True b. False

math
das

algebra
6n+8=50 answer using the balancing method

Math
This questions is like a word problem for a triangle. Draw point A and head 2 unit down draw point B there, then draw a point 3 units to the right. draw point C there it should be a right triangle with C-A as the hypotenuse. So distance C-A equals the square root of 2^2 + 3^2 ...

math
hi does anyone know what (h+t)^6 is? Thanks

math
hi does anyone know what (h+t)^6 is? Thanks

statistics
The size of a car \\\\\9small,med, and lar) are measured on a)ratio b) interval c) ordinal D nominal scale. Why

12 th English
I need to write a Parody on TV media analysis. Where do I begin?

Chemistry--Quick Question
I have the same question for class! correct answers are a,c,d?

chemistry
If 8.00 kJ of heat are added to 200. g of water at 20.0 C, what is the final temperature of the water?

Math
If a right triangle has legs of 9in. and 12in. What is the length of the hypotenuse?

calculus ap
If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f'(x)=(x2-4)g(x), which of the following is true?

math
what is 7-2i in trig form? and if u=3j and v=7i+j what is the dot product of u times v don't get this one because there are no i terms for u thanks

world history
what three types of land are best suited for agriculture

algebra
the length of the top of a table is 6 m greater than the width. the area is 91m^2. Find the dimensions of the table.

physics
Two boxes are seen to accelerate at the same rate when a force F is applied to the first and 5 F is applied the second. What is the mass ratio of the first box to the second?

physics
A 1.5 kg otter starts from rest at the top of a muddy incline 87.1 cm long and slides down to the bottom in 0.60 s. What net external force acts on the otter along the incline?

Physics
An airplane of mass 1.3 104 kg is moving at 64 m/s. The pilot then revs up the engine so that the forward thrust by the air around the propeller becomes 7.2 104 N. If the force exerted by air resistance on the body of the airplane has a magnitude of 4.0 104 N, find the speed ...

fin
3. Suppose an individual's MRS (of steak for beer) is 2s/b and this person is currently consuming equal amounts of steak and beer. Suppose also that the price of a steak is \$1 and a beer is \$4. Then what should the individual do in order to increase utility? Explain in 3-5...

fin
4. If an individual's utility function for coffee (x) and cream (y) is given by U(x, y) = min (x, 5y), write the demand function for coffee .

macroeconomic theory
7. Assume x and y are the only two goods a person consumes. If after a rise in pX the quantity demanded of y increases. Evaluate the following as true or false and explain. Support your explanation with a graph. The income effect dominates the substitution effect for good y...

macroeconomic theory
4. If an individual's utility function for coffee (x) and cream (y) is given by U(x, y) = min (x, 5y), write the demand function for coffee .

math
sin^-1 (12/7 sin42\[Degree]) b = sin -1 (12/7 sin 42 degrees) How do I do this?

Trig
How do I do this? I punch the numbers into my calculator, and they don't work. B=sin^-1 (12/7 sin42\[Degree])

MATH
solve (x-3)(x+3)<0. xsquared-3x+3x-9 x squared=9 x=3

algebra
1/2x

pre-algebra
3x + 2x=5-6+6 5x=5 x=1

Math
a. 10% out of 100% failed A or 10/100 3% of 100% failed A & B or 3/100 3% that failed A(10%) also failed B or 3/10 b. 12% out of 100% failed B 3% out of 100% failed A & B or 3/12 c. failed A - 10% failed B - 12% sub total 22%(-3% counted double-failed both) = 19% total d. 100...

college chemistry
not sure I guess i put it down that way because im in college taking it.

college chemistry
At a prominent state hospital, a 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. State the methods by which a radiation oncologist can administer these therapies. ...

college chemistry
Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.

Calculus
assume the rate at which the world's oil is being consumed is r = 27 e^0.06 t. Here, just as in your book, r is in billions of barrels per year, t is in years, and t = 0 is January 1, 1990. (a) Fill in the blanks below to express the definite integral which measures the ...

Calculus
∫4 [( ( ln(z) )^ 2)/z] dz ∫[( 7 e^(7 √x))/ √x] dx ∫[(2 x + 5)/( x^2 + 5 x + 2)] dx

physics
A pilot wants to fly west (ie., the resultant is west). If the plane has an airspeed of 9.5 m/s, and there is a 25m/s wind blowing north, in what direction must she head the plane?

arithmetic
a recipe for rice pudding uses 1/2 cup of rice and serves 6 people. write the cups of rice per person as a unit rate . how many cups of rice do you need to serve 75 people?

Chemistry
The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate <, =, or > symbol to separate substances in the list.) ^3H (12.2 years) ^24Na (15 ...

Chemistry
How did you get N?

Chemistry
Each of the following nuclides is known to undergo radioactive decay by production of a beta particle, ^0_-1e. Write a balanced nuclear equation for each process. (Use 'e' for an electron, 'p' for a positron, and 'n' for a neutron. Omit states-of-matter...

physics
A 50.0 kg girl bounces up and down on a pogo stick. The girl has an instantaneous acceleration of 2.0 m/s^2 when the displacement is -8.0cm. What is the spring constant of the pogo sticks spring?

physics
Find the length of a pendulum that has a frequency of 0.80 Hz?

physics
A 0.025 kg object vibrates in SHM at the end of a spring. If the maximum displacement of the object is 0.030 cm, and its period is 0.50s, what is the maximum acceleration of the object?

physics
A 0.11kg mass is vibrating at the end of a horizontal spring along a frictionless surface. If the spring constant is 0.52 N/m, what is the displacement of the mass when the acceleration of the mass is 0.25m/s^2?

physics
A man is pulling on a rope with a force of 53 N directed at an angle of 70◦ to the horizontal. What is the x-component of this force? Answer in units of N.

algebra
Convert to a logarithmic equation: 9y = 6561

CHEMISTRY
For the reaction 3 O2(g) reverse reaction arrow 2 O3(g) If the equilibrium mixture is analyzed and [O2(g)] is found to be 3.77*10-2 M, what is the concentration of O3(g) in the mixture?

Chemistry
How to find the coefficient of Fe^2+ from ClO3^- + Fe^2+ --> Cl^- + Fe^3+

Chemistry
Which has the higher [H+], 0.40 M RbOH or 0.20 M Ca(OH)2?

When comparing two independent population means, how do I find the degree of freedoms?

Statistics
When comparing two independent population means, how do I find the degree of freedoms?

physics
what is L?

Calculus
The velocity of a car (in miles per hour) is given by v(t) = 61.25t − 17.5 t^2 where t is in hours. Write a definite integral for the distance the car travels during the first 2.5 hours. Use your graphing calculator to find this distance. Distance =

physics
A 1500-kg car is making a turn with a 100.0-m radius on a road where the coefficient of static friction is 0.70. What is the maximum speed the car can go without skidding?

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