Friday

August 1, 2014

August 1, 2014

Total # Posts: 1,694

**chemistry**

What volume of hydrogen gas is produced when 19.6 g of sodium reacts completely according to the following reaction at 25oC and 1 atm? sodium (s) + water (l) sodium hydroxide (aq) + hydrogen (g)

**Comm 100**

Amanda sits in the seat right next to another person in a movie theater full of empty seats. The other person gets up and moves to another row. According to the expectancy violations model, the other person responded to Amanda's behavior by ________.

**math**

7

**Physics**

include the steps too please!

**Physics**

Calculate the force of gravity on a 2 kg mass at Earth’s surface. The mass of Earth is 6 * 10 ^24 kg, and its raidus is 6.4 * 10 ^ 6.

**SAT**

How does the SAT motivate students?

**pre calc**

Simplify csc x - cos x cot x

**pre calc**

If tan theta=-3/4 and 90°<theta<180° Then find cos theta

**pre calc**

If csc A=2 find the value of sin A

**SAT**

What are some reasons to why the SAT is fair?

**principle of management**

couldn't it be organzing? "B"

**world history**

Political instability between competing states during the period from 1000 to 500 B.C.E. led to A. advances in technology. B. a decrease in trade. C. a decline in new religious practices. D. fewer opportunities for new ideas about society.

**College Algebra**

Find X such that the point(x,9) is 10 units from (9,3)

**English**

Tell me everythings thats up there

**English**

10 words of merry things 3 words of frosty things 10 words of musical gifts 9 words of things with bells

**chemistry**

An endothermic reaction was found to have an activation energy of 100 kJ. If this reaction is reversed, the activation energy is only 20 kJ. What is the value of delta H for the endothermic reaction?

**chemistry**

In an exothermic reaction, delta H was found to be -40 kJ, and the activation energy to be 30 kJ. What would be the activation energy of the reverse reaction?

**business math**

$12916.70

**history**

I just did this test, the correct answer is D.

**Geometry**

How do I determine if a quadrilateral is a parallelogram? Does anyone know the formula to determine this because I have to justify my answers. Thanks.

**psychology**

The task is to redesign Milgram's experiment so no one is hurt, physically or emotionally. However, from my understanding, the experiment is designed to test how far subjects will obey an authority figure even if it means inflicting pain on another. To inform the subject, ...

**physics**

Samuel travels to the east at 15m/hr for 20 minutes. Then hevtravels 30 degrees north of east 2m/s for 15 minutes. What is his displacement?

**physics**

Samuel travels to the east at 15m/hr for 20 minutes. Then hevtravels 30 degrees north of east 2m/s for 15 minutes. What is his displacement?

**algebra**

What is b__8 help me

**chemistry**

Determine the [H3O+]. Are these solutions acidic or basic? a. [OH-]=7.0x10^-8 a. [H3O+]= acidic or basic? b. 0.00030 M Mg[OH]2 b. [H3O+]=acidic or basic?

**chemistry**

Determine the pH. Are these solutions acidic or basic? a. [H3O+]=1.0*10^-8 a. pH=acidic or basic? b.[OH-]=1.0*10^-9 b. pH=acidic or basic? c.pOH=1.4 c. ph= acidic or basic? d.pOH=7.8 d. pH=acidic or basic?

**chemistry**

Identify the conjugate acid of the following bases? what acid is it? A) F^- B) HSO4^- C) CH3COO^- D) CO3^2-

**chemistry**

Identify the conjugate base of the following acids? The names. For example HCl is hydrochloric acid. A) HSO4^- B)H3O^+

**chemistry**

78.7 mL sample of a 4.81 M sucrose solution is diluted to 120.0 mL. What is the molarity of the diluted soluti?

**chemistry**

78.7 mL sample of a 4.81 M sucrose solution is diluted to 120.0 mL. What is the molarity of the diluted soluti?

**chemistry**

can u please explain to me where did u get 2 to find radius?..

**chemistry**

a metal crystallizes in the face centered cubic crystal structure with a unit cell edge of 5.48 x10 power of -8 cm. the density of the metal is 6.90 g per cubic cm. a. what is the mass (g) of a single atom of this element. b. what is the atomic weight of the element (g per mol...

**chemistry**

a metal crystallizes in the face centred cubic cubic crustal structure with a unit cell edge of 5.48 x10 power of -8 cm.the density of the metal is 6.90g per cubic cm. a. what is the mass in grams, of a single atom of this element. b. what is the atomic weight of the element (...

**chemistry**

and also how to get the # of atoms per unit cell...

**chemistry**

can u please explain to me where did u get the 3 to find radius?.. thank you..

**chemistry**

Rubidium crystalizes in the body centred cubic structure with an edge length of 560.5 pm.. a. calculate the radius (in pm) to 4 sig figures. b. calculate the density to 4 sig.fgures. thnks guys..

**chemistry**

hi need help for these questions a. which of the ions Cs+, Sr 2+, Ba 2+, will have the largest heat of hydration?which is the smallest? b. of the two compounds NaF and MgF2,which has the strongest intermolecular forces? c. of the two compounds NaNO3 and HF, which has the stron...

**medical billing and coding**

ok when it is put that way I udnderstand it better. thank you very much Ms. Sue, have a good night.

**medical billing and coding**

I got the code modifier for each one down but i am not understanding how to give the rationale my intructor needs.

**medical billing and coding**

I need help with this assignment. Apply the appropriate Level II HCPCS code modifier for each of the following examples. Explain your rationale for each selection. a. Sutures, upper right eyelid b. MD calls ambulance to transport a patient from his office to the hospital for r...

**Chemistry**

a solution is made by combining 10.0 ml of 17.5 M acetic acid with 5.54 g of sodium acetate and diluting to a total volume of 1.50 L. a)calculate the pH of the solution. b) how many grams and milliliters of 14.6 M potassium hydroxide needs to be added so pH=pKa? c)what is the ...

**chemistry**

thank you..

**chemistry**

Consider the following entities: Ar, SiH3F, Xe and CClF3. which one will diffuse the fastest?what is rms speed (m/s) of the slowest moving atom at 25 C..?

**physics**

A 140 kg sleigh is pulled by one horse at a constant velocity for a distance of 0.90 km on a level snowy surface. The coefficient of kinetic friction between the sleigh runners and the snow is 0.25. what is the work done by force? what is work done by friction?

**phyiscs!**

Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.51 m and finds that it makes 291 complete oscillations in 697 s. The amplitude of the oscillations is very small compared to the pendulum’s length. What is the gravitational acc...

**pre algebra**

USE MULTIPLYING BY 1 TO FIND AN EXPRESSION EQUIVALENT TO 8/5 WITH A DENOMINATOR OF 5A

**Biochemistry (BCMB)**

why do plants already have ATP and NADPH for chemical energy from lights reactions of photosynthesis but they still go on to manufacture energy-rich sugars?

**algebra**

A 4m by 6m rug covers half of the floor area of a room and leaves a uniform strip of bare floor around the edges. What are the dimensions of the room?

**media and the culture**

Thank you so much for your help. I don't know why I should of taken one step at a time. Maybe I'm just in a hurry to get this assignment done. Once again, thank you for your help.

**media and the culture**

I don't understand the question and where to start. I'm so confused and overwhelmed with the question.

**media and the culture**

Write a 500- to 550-word essay response for Part Two. Comprehensive writing skills must be used. Explain the effect of relationships among television, movies, and electronic games with culture. Include the following: • How culture is reflected in movies and television ...

**business communication**

I agree also. The answer is A.

**physics**

A 0.060-kg handball is thrown straight toward a wall with a speed of 9 m/s. It rebounds straight backward at a speed of 6.7 m/s (a) What impulse is exerted on the wall? magnitude 0.942 kg·m/s (b) If the ball is in contact with the wall for 3.0 ms, what average force is ...

**Social studies**

Im not really sure what the social and economic effects on industrial revolution are?

**Social studies**

Write a paragraph explaining the social and economic effects of an industrial revolution.

**Chemistry**

Dissolving one mole of salt in water yields two moles of ions. A:NH4[Pt(NH3)Cl3] B: tris(ethylenediamine)cobalt(III) sulfate C: tetraaquadichloronickel(IV) chloride D: [Co(NH3)2(en)Cl2]Cl E: [Co(en)2Cl2]Br F: sodium hexacyanoferrate(II) None of these compounds

**Chemistry**

Okay so I kinda understand where to put the numbers into the formula but i'm not sure how to calculate the distance so could someone kindly walk me through the problem so i can understand it. Thank you so much. Calculate the amount of energy required for the formation of o...

**Programing**

write a pseudocode for a program that asks for the Employee ID, the hours worked and the pay rate, then returns the employee's gross pay for the week?

**chemistry**

What is the maximum amount of ethanol (in grams) that can be produced when 1.0 kg of ethylene (C2H4) and 0.014 kg of steam are placed into the reaction vessel? Ethanol (C2H5OH) is synthesized for industrial use by the following reaction, carried out at very high pressure. C2H4...

**chemistry**

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a comma. Equation 7.1: Zef...

**College Chemistry**

One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When one mole of H2O(g) is condensed to one mole of H2O(l) at 1.00 atm and 100.°C, 40.66 kJ of heat is released. If the density of H2O(l) at this temperature and pressure is 0.996 g/cm3, calculate &...

**College Chemistry**

As a system increases in volume, it absorbs 52.5 J of energy in the form of heat from the surroundings. The piston is working against a pressure of 0.500 atm. The final volume of the system is 58.0 L. What was the initial volume of the system if the internal energy of the syst...

**College Chemistry**

Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 50. cm3. If the combustion of this mixture releases 955 J of energy, to what volume will the gases expand against a constant pressure of 675 torr if all the energy of combustion is...

**Chemistry**

Use Equation 7.1 and assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff} for these two ions. Express your answers as integers. Enter your answers numerically separated by a comma. Equation 7.1: Zef...

**Physics**

At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of F = 84.4 N at an angle of 64degrees. The acceleration of gravity is 9.8 m/s/s. The box of books has a mass of 14 kg and the coefficient of kinetic f...

**Education 301**

I need to complete an assignment for edu 301 and I am completely lost. Can anyone help me get started? Create a flowchart, in which you create an organizational structure for the education system for the federal, state, district, and school levels. I have researched flowcharts...

**Chemistry**

Bond angles will be 90, 120, and 180 due to the seesaw shape created by the lone pair of electrons.

**science**

frontier ethic.

**PHYSICS PLEASE HELP !!!!!**

A roller coaster cart with a mass of 13 kg travels around two frictionless, circular loops. It just barely makes it around the top of the first circular loop which has a radius of 24 meters. It then travels around the other loop with a radius of 14 meters. What is the normal f...

**PHYSICS PLEASE HELP !!!!!**

A mass of 6 kg is tied to a 2 meter long rope and is swung in a vertical circle. At the bottom of the circle, the mass is moving at a speed of 16 m/s. What is the tension, in Newtons, in the rope after the mass has traveled to a point exactly halfway between the top and bottom...

**PHYSICS PLEASE HELP !!!!!**

An object with a mass of 13 kg slides 5 meters across a horizontal surface with a coefficient of kinetic friction of 0.38. For the duration of the slide an external force, F1, acts on the mass in the positive y direction while another force, F2, has a magnitude of 67 Newtons a...

**PHYSICS PLEASE HELP !!!!!**

An object with a mass of 3.7 kg slides in the positive x direction across a horizontal surface with a coefficient of kinetic friction of 0.24. During its slide a force of 364 Newtons acts on it in the positive x direction while a force of 44 Newtons acts on it in the negative ...

**PHYSICS PLEASE HELP !!!!!**

On some planet with a radius of 8,553 km and a mass of 5.55 x 1024 kg the planet is spinning so fast such that anything at the equator will fly off of the planet. What is the planet's period (length of a day on the planet) in hours? Please help me solve !

**Natural science**

What might happen to earth if the temperature in the atmosphere rises by 5degrees and if the water in the ocean gets colder?

**algebra**

twenty times the cost of a record, increased by eighty-nine cents

**PHYSICS PLEASE HELP !!!!!**

A mass of 30 kg lies on a horizontal surface with a coefficient of static friction of 0.72 and a coefficient of kinetic friction of 0.31. If a force of 25.1 Newtons is applied parallel to the surface (+x direction if you prefer), what is the magnitude of the acceleration of th...

**PHYSICS HELP PLEASE !!!!!**

A mass of 17 kg lies on a horizontal surface with a coefficient of static friction of 0.54 and a coefficient of kinetic friction of 0.22. If a force, F, is applied parallel to the surface (+x direction if you prefer), what is the magnitude that F needs to be to begin to move t...

**PHYSICS HELP PLEASE !!!!!**

A 21 kg object is placed on an incline with friction. The incline is raised slowly from zero degrees and at 60.71 degrees, the object begins to slide down the incline. What is the coefficient of static friction? Be as accurate as possible with your answer and be sure to enter ...

**PHYSICS HELP PLEASE !!!!!**

A 21 kg object is placed on an incline with friction. The incline is raised slowly from zero degrees and at 60.71 degrees, the object begins to slide down the incline. What is the coefficient of static friction? Be as accurate as possible with your answer and be sure to enter ...

**medical billing and coding**

you are a medical office manager who wants to make the cofing process easier for employees to understand. to facilitate better understnading of this process, respond to the following: come up with buzzwords or slogans that would best describe the three CPT code categories. wha...

**PHYSICS HELP PLEASE !!!!!**

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

**Physics.**

A mass of m1 = 12 kg is placed on an incline with an inclination angle of 50 degrees, a coefficient of kinetic friction of 0.16, and a coefficient of static friction of 0.89. m1 is tied to a rope which runs parallel to the incline and runs over a pulley to a hanging mass of m2...

**Physics.. please help!!!!!**

That is not right drwls

**physics**

A 0.82 kg physics book with dimensions of 32.4 cm by 20.1 cm is on a table. What force does the book apply to the table? Answer in units of N

**physics**

Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 74 kg student to accelerate downward at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall. Answer in units of m/s2

**physics**

A 53.5 N object is in free fall. What is the magnitude of the net force which acts on the object? Answer in units of N What is the magnitude of the net force when the object encounters 15.4 N of air resistance? Answer in units of N What is the magnitude of the net force when i...

**physics**

A certain spring stretches 4.6 cm when it supports a mass of 0.55 kg . If the elastic limit is not reached, how far will it stretch when it supports amass of 8 kg ? Answer in units of cm

**algebra**

The length of the base of an isosceles triangle is one fourth the length of one of its legs. If the perimeter of the triangle is 16 inches, what is the length of the base?

**chemistry**

Acetylene gas, c2h2, burns in oxygen to produce carbon dioxide and water. If 61.4 g of co2 are produced when 22.7g c2h2 react with sufficient oxygen, what is the percent yield for the reaction?

**CHEmistry**

The balanced reaction equation for combustion of Mg is: 2 Mg + O2 --> 2 MgO. In the reaction vessel you have 1.0 moles of Mg and 0.30 moles of O2. What is the limiting reactant? How many moles of MgO can you possibley make?

**math**

Bethany has 40 apples. Write a subtraction story about the apples that would require regrouping. Then write the answer in a complete sentence.

**physics**

A stone falls from a cliff. It lands on the ground below the cliff after 4.2 seconds. The height of the cliff can be calculated to be what?

**physics**

In the equation y squaared minus 1/4 g squared t cubed, y is the displacement, t is the time, and g is the gravitational acceleration. The right hand side of the equation has units of?

**physics**

a rectangular barge with a flat bottom, has an area at the bottom of 4m squared. the weight of the barge plus its cargo is 5,000 newtons. what is the mass of the barge + cargo in kilograms?

**economics**

An increase in personal income tax rates will cause a(n)

**Pre-Calculus**

A rectangle is bounded by the x-axis and the semicircle y = √36 – x2, as shown in the figure below. Write the area A of the rectangle as a function of x, and determine the domain of the area function. A = all real numbers except x = 36 all real numbers except x = 6 ...

**Math- Probability**

in a recent year, 281 of the 290,789,000 people in the U.S. were struck by lightning. estimate the probability that a randomly selected person in the U.S would be struck by lightning this year.

**CHEM**

Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)

**Chemistry**

Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)

**physics**

A plane flying horizontally at a constant velocity drops a bomb on a cave from a height of 500 m. At the moment the bomb hits the ground, the plane is A.) 250 meters beyond the cave B.) Directly over the cave C.) 250 meters from the cave D.) Some other wild guess

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