Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 86

**chemistry**

C6O2H8, Ka = 1.7 x 10-5 calculate pka

**Chemistry**

What is the concentration of H3O+ in a solution with the following pH values. Enter your answer in scientific notation. a. 6.66 b. 13.40 c. 13.17 d. 2.39

**Chemistry**

At pH 3.85, which of the following is true? A.[lactic acid] > [lactate ion] B.[lactic acid] < [lactate ion] C.[lactic acid] = [lactate ion] At pH 11.61, which of the following is true? A.[lactic acid] = [lactate ion] B.[lactic acid] < [lactate ion] C.[lactic acid] &g...

**Chemistry**

Sometimes the basicity of a solution is reported using pOH (pOH = -log[OH-]). What is the a. [OH-] if pOH = 1.90 b. [H3O+] if pOH = 12.94 c. pH if pOH = 9.70

**chem**

Calculate the pH of a solution in which a. [H3O+] = 7.8 x 10-7 M b. [H3O+] = 5.1 x 10-6 M c. [H3O+] = 6.1 x 10-5 M d. [H3O+] = 9.3 x 10-4 M

**Algebra**

Factor: 24x^3-3 I think you use the perfect cube formula which would be a^3+b^3=(a-b)(a2+ab+b2) but not sure how to go about doing this.

**Algebra**

Erin has three more dimes than nickles and twice as many quarters as dimes. she has a total of $5.05 How many of each type of coin does Erin have 5.05= 2q-d-3d-n A Piece of rope that is 63 meters long is cut into three pieces such that the second piece is twice as long as the ...

**Algebra**

Thank you so much I really appreciate you helping me set up these problems, again thank you!

**Algebra **

Joe and Theresa want to paint their living room. From past experience they know that Joe can paint the room in 6 hours and Theresa can paint it in 10 hours. How long will it take them if they work together? Mower A can cut a field in 6 hours and Mower B cut the same field in 2...

**Chemistry help!**

A sample of gas at a temperature of 37.0°C has a pressure of 725 torr and occupies a volume of 3.44 L. a. Use Boyle’s law to calculate the new pressure if the temperature is held constant and the volume is increased to 6.54 L. torr b. Use Gay-Lussac’s law to calc...

**Chemisrry**

A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present? I know you Use PV = nRT and solve for n = number of mols gas. Then n = grams/molar mass and solve for grams. 630 ml= 1l= 1000ml 0.63 L 20=293.15 k 0.75*0.63=n*0.08...

**Chemistry **

a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2? It would be much simpler to change quart to liters first, then torr to kpa PV=nRT n= PV/RT Temps in Kelvins, V in liters, P in kp...

**Chemistry**

I used what you said but I'm still getting the wrong answer. I'm sorry I really struggle in chemistry

**Chemistry**

1L=1.06qt 1.00 / 1.06 = 0.94339623 425 torr = 56.7 kpa 35= 308.15 k 56.7/0.0821*308.15 = 212814.921

**Chemistry**

a. How many moles of N2 are present in a 1.00 qt flask that has a pressure of 425 torr at a temperature of 35°C? What is the mass in this na2? It would be much simpler to change quart to liters first, then torr to kpa PV=nRT n= PV/RT Temps in Kelvins, V in liters, P in kpa...

**Chemistry**

I really struggle in chemistry sometimes I know the formulas but I don't know how to put the correct numbers where they need to be .

**Chemistry **

150.0 mL flask contains 740. g of N2 at 0°C. What is the pressure in atm. What is the pressure in torr? What is the pressure in psi? I know you have to do: n = grams/molar mass Then PV = nRT R in 0.08206 L.atm/mol.K gives P in atm atm x 760 = p in torr 1 atm = 14.7 psi

**Chemistry **

A mixture of gases contains 0.65 mol of N2, 0.70 mol of O2, and 0.90 mol of He. What is the partial pressure of each gas (in atm and in torr) in a 25.0 L cylinder at 340 K? What is total pressure? I know you: Use mols each gas in PV = nRT and solve for p. Then Ptotal = pN2 + p...

**Chemistry **

At a temperature of 57oC, a gas inside a 5.30 L metal canister has a pressure of 4000 torr. If the temperature is decreased to 13oC (at constant volume), what is the new pressure of the gas? I know you use the formula (P1/T1) = (P2/T2)

**Chemistry **

At a pressure of 2.4 atm a balloon has a volume of 9.8 L. If the pressure is decreased to 0.96 atm (at constant temperature), what is the new volume of the balloon. I know you use the formula P1V1 = P2V2

**Chemistry**

630 ml= 1l= 1000ml 0.63 L 20=293.15 k 0.75*0.63=n*0.0821*293.15 =1687.13002

**Chemistry**

A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present? I know you Use PV = nRT and solve for n = number of mols gas. Then n = grams/molar mass and solve for grams. But I get the wrong answer

**Algebra**

At a pressure of 2.4 atm a balloon has a volume of 9.8 L. If the pressure is decreased to 0.96 atm (at constant temperature), what is the new volume of the balloon?

**Chemistry**

I know how to set the problem up but when I go to solve I get the wrong answer can you help me please?.

**Chemistry**

I know how to set the problem up but when I go to solve I get the wrong answer can you help me please?

**Chemistry**

At a temperature of 57oC, a gas inside a 5.30 L metal canister has a pressure of 4000 torr. If the temperature is decreased to 13oC (at constant volume), what is the new pressure of the gas?

**Chemistry**

I know how to set the problem up but when I go to solve I get the wrong answer can you help me please? I really need help

**Chemistry**

At a pressure of 2.4 atm a balloon has a volume of 9.8 L. If the pressure is decreased to 0.96 atm (at constant temperature), what is the new volume of the balloon?

**Chemistry**

A 630. mL flask contains O2 at a pressure of 0.75 atm and a temperature of 20°C. What mass of O2 is present?

**Math**

A pair of belted pulleys have diameters of 20 inch and 16 inch respectively.If the larger pulley turns at 2000 rpm, how fast will the smaller pulley turn.

**Math**

The U drive rent a truck company plans to spend 13 million on 320 new vehicles. Each commercial van will cost $35000, each small truck $30000, and each large truck $80000. Past experience shows that they need twice as many vans as small trucks. How many of each type of vehicle...

**Math**

Lebron James scored 34 points on a combination of 21 foul shots (1 point) and two pointers. How many shots of each type did he make.

**Geometry**

1. Twyla's pet cat weighs 8lb. Her pet hamster weighs 12 ounces. What is the ratio of her cat's weight to her hamster's weight? 2. The non-right angles of a right triangle are in the ratio 1:5. Write the equation that could be used to find the measure of each angle.

**Geometry**

find the slope of the lines passing through the points. (6,-2), (1,3).

**Geometry**

1. AB has endpoints A(8,K) and B(7,3). The slope of AB is 5. What is K? 2. Two angles of a triangle measure 68 and 54. What is the measure of the third angle?

**geometry**

P(6,6)y=2/3x

**Geometry**

ABC is an obtuse triangle with m<A=21 and <C is acute. a)What is m<B+m<c? B)What is the range of whole numbers for m<C? C)What is the range of whole numbers for m<B?

**Geometry**

<1 and <2 are vertical angles. If m<1=4x and m<2=56. What is the value of x?

**Geometry**

a rectangular swimming pool has an area of double 1500ft. The rectangular pool is 50ft. The rectangular walkway that surrounds the pool is 4ft. How many feet of fencing do you need to surround the walkway?

**geometry**

<1 and <2 are vertical angles. If m<1=63 and m<2=4x-9 what is the value of 9.

**Geometry**

<1 and <2 are same side interior angles formed by two parallel lines a transversal. If m<1=115, what is m<2?

**coustic poems**

What is the acoustic poem for kilometre

**Physics**

When you're driving your 1200-kg car, you go around a corner of radius 60.8 m. The coefficient of static friction between the car and the road is 0.67. Assuming your car doesn't skid, what is your speed if the force exerted on it is 5800N?

**Physics**

An object of mass 1.4kg is placed 12.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the object remains fixed on the turntable until a rate of 36 rpm is reached, at which point the object slides off. What is th...

**Physics**

Tarzan swings on a vine 6.8 m long. The tension in the vine is 1200 N if he's moving at 2.9 m/s when the vine is vertical. What is his mass?

**Chemistry**

Using the equation 4Fe + 3O2 -> 2Fe2O3, calculae the total mass of oxgen needed to react wih all of 0.55 g of iron.

**organic chemistry**

Methanol, CH3OH, contains a C-O bond. In this bond, which of the following best describes the charge on the carbon atom. a.) -1 b.) +1 c.) uncharged d.)slightly negative e.) slightly positive the answer key says slightly positive but isn't it uncharged? what makes somethin...

**organic chemistry**

What orbitals overlap to create the C-O bond in CH3OH? A. sp3-sp3 B. s-sp3 C. s-p D. sp2-sp3 E. s-sp2 I know the answer is A because it's on a practice test and the answers are circled but I have no idea why it is that way. Please explain.

**math**

In Exam Figure 7, AA′ = 33 m and BC =7.5 m. The span is divided into six equal parts at E, G, C, I, and K. Find the length of A′B. Round your answer to two decimal places.

**math**

how to write the rate as a unit rate?

**physics**

A 5.0 kg block with a speed of 2.8 m/s collides with a 10 kg block that has a speed of 2.0 m/s in the same direction. After the collision, the 10 kg block is observed to be traveling in the original direction with a speed of 2.5 m/s. What is the velocity of the 5.0 kg block im...

**chemistry**

calcululate the molality of CsCl in a 8% by mass aqueous solution. answer in units of m

**Pre-Calc**

2-2

**Physics**

A 27-pound meteorite struck a car in Peekskill, NY, creating a dent about 22 cm deep. If the initial speed of the meteorite was 550 m/s, what was the average force exerted on the meteorite by the car?

**chemistry! URGENT!!!**

A gaseous mixture of O2 and N2 contains 30.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 365 mmHg?

**chemistry**

the pressure on a gas at-73 Cis doubled, but its volume is held at constant. What will the final temperature be in degrees Cesius?

**algebra**

factor: x^2-11x+19=-5

**Math-Calculus**

i have to questions that just need to be checked on to see if i got them right. Lim x-->infinity for both problems 10/x+10 is number one i got 0 for this one. or is it does not exist. lim x-->infinity 6x/6x+5 for this one I got One. (1) is that correct.??

**easy cal Q**

Thanks! Exactly what I was looking for.

**easy cal Q**

lim x--->a x^2+a^2/x+a I know this equals (a) but I dont know how to explain my answer.

**physics**

A) m*v^2=kinetic energy m*72^2=7.6*10^7 m*(7.6*10^7)/(72^2)=14660.5kg B) p=w/t p=(7.6*10^7)/2=3.8*10^7 p=38000000 watts

**math**

When a boy pulls his sled with a rope, the rope makes an angle of 70 with the horizontal. If a pull of 16 pounds on the rope is needed to move the sled, what is the horizontal component force?

**Philosophy - Ethics**

Thank you so much for all your help! :) I apperciate it soo much!! And I agree, he basically says that the good will is the only way humans will have moral worth, Duty + ~Inclination = Good Moral Worth. But then he says there is no way to tell if people are acting on pure duty...

**Philosophy - Ethics**

I asked a question yesterday about Immanuel Kant, Grounding of the Metaphysics of Morals, and now I have a new question. I am writing a paper on how Kant is saying that inclinations shouldn't be involved in moral decisions, because inclinations do not lead to moral worth, ...

**Philosophy - Ethics**

Is moral obligation more important to Kant then the Kingdom of all ends? This is what is tripping me up. I don't know if I can find enough supporting evidence on how experience,and inclinations play no role in the forming an universal law. However, when he goes about his r...

**Philosophy - Ethics**

I'm trying to write a 2-3 paged essay about a topic that Immanuel Kant covers in his book Grounding for the Metaphysics of Morals. My working thesis is 'Univeral law of morality can not be based on anything other than duty.' But I don't know if I should say dut...

**Science**

That boy shot up five inches in only one year

**Grammar**

I recommend to him that he asks his guide for more information about the museum because it is marvellous. I recommend to him to ask his guide for more information about the museum because it is marvellous. This one has me stumped.

**spanish**

Does anybody know what a synoymn for respeta is and what respeta means?

**spanish**

I am not quite sure if mentir is an irregular verb but I need help conjugating it innto the he/she form. Could you help me out?

**English - Proof reading**

Well.. it IS written by a freshman... and not to be mean.. I just wanted to know if it had any gramatical errors

**English - Proof reading 3rd part**

So there you have it. Clearly the question asked in the beginning which was the most powerful, The White Witch or Macbeth. The Witch was stated to be the most powerful. From everything that has been said, it’s leaning toward the Witch being the most powerful. As you could...

**English - Proof reading**

ah.. the rest of it never posted The first question that came to mind was; What are the reasons? Let’s start off with Macbeth first. Macbeth doesn’t have an army or a “Magic Wand”, so his powers wouldn’t possibly as great as the White Witches. The Witc...

**English - Proof reading**

Could someone just proof read this for me and help me make sure the grammer and spelling is correct? Macbeth or the White Witch Uh... What was the Question? I have decided to compare Macbeth to the White Witch from “The Chronicles of Narnia: The Lion, The Witch and the Wa...

**Geometry**

Okay, this confirmed what I thought it was. Thanks

**Geometry**

A cone is formed by revolving which of the following figures about a line containing one of its edges? A. Rectangle B. Right Triangle C. Semicircle D. Hexagon

**A Cell Crossword Puzzle (science)**

tell me the answers

**Science/Math**

How do you convert 28cm/s - km/hr^2?

**Honors Physical Science**

Did the object have a greater acceleration from 0s-8s or from 9s - 16s? What was the difference between the 2 accelerations? I figured out that the acceleration for 0s - 8s is 3cm/s and that the acceleration from 9s - 16s is -3.28cm/s but i don't know which one has the gre...

**Honors Geometry**

You work for a fencing company. A customer called, wanting to fence in his 1,320 square-foot rectangular garden. He ordered 148 feet of fencing, but you forgot to ask him for the width and length of the garden (these dimensions will determine some of the details of the order, ...

**MATH**

what 3D shape as 20 congruent equilateral triangles as faces

**Algebra 2**

A music teacher wants to determine the music performances of students. A survey of which group would produce a random sample. students in school band students attending the jazz concert students in every odd numbered homeroom There was choices about sports players but i think ...

**Algebra 2**

Write an equation for the nth term of the geometric sequence: -12,4,-4/3 I had a_n=-12(3)^(n-1) but that is not a choice on the multiple answers they have = -12(1/3)^(n-1) = 12(-1/3)^(n-1) = -12(-1/3)^(-n+1) = -12 (-1/3)^(n-1)

**History**

When was colorado let in to the united states?

**science**

when you make the proper adjustments, your sub begins traveling with the currents of the thick, yellow jelly and heading toward you. You try to avoid the gaint bag, but the cellular current races you straight toward it. The bag splits apart for a second and swallows you whole,...

**Science**

Show me how to choose an element and draw it's atomic model Labeling all the parts and particles

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