# Posts by Jake

Total # Posts: 2,238

**Chemistry**

I can't figure out how to solve this problem: The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required to prepare a 250. mL acidic buffer with pH = 2.75. The initial molarity of hydroflouric acid is .250M but you have only 75mL...

**Chemistry**

The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL.

**Speech Class**

Thank you mam :)

**Speech Class**

yeh so i think its true :)

**Speech Class**

True or False, Communication can involve language but not speech.

**english**

Yay, I am so excited!! Thank you Did I leave any out?

**english**

Opening and professional are advectives

**english**

played their (first) game the (first) team besides season in a (new) ballpark have a (long) standing rivalry Are these corerct and are there still others?

**english**

I have found opening and professional. I keep redoing my paragraph to make it easier to find them but it is not working for me.

**english**

Could you please help me locate the adjectives and adverbs in the below paragraph? St. Louis is most often considered to be Cardinals Nation. The greatest day in St. Louis is opening day of baseball. The St. Louis Cardinals are a professional baseball team in St. Louis, ...

**English**

Here is my new paragraph that I revised. Please help me with the adjectives and adverbs. I have a learning disorder and get very upset when I can not figure things out. Thanks St. Louis is most often considered to be Cardinals Nation. The greatest day in St. Louis is opening ...

**English**

opening is before day in the first sentence. Some is in the 3rd to last sentence. Do you know how many adjectives there are in the paragraph?

**English**

I think the adjectives are opening central national major some Please let me know if I am correct.

**English**

Can you give me a hint on the number of adjectives you see?

**English**

I seen the help you gave other people and was wondering if you could help me idenify 5 adjectives and adverbs in my paragraph. St. Louis is considered to be Cardinals Nation. The St. Louis Cardinals are a professional baseball team based in St. Louis, Missouri. They were ...

**math**

what does 4/5 of 25 mean?I don't get that

**math**

Input:4 and 6 Output:12 and 17 What's the rule

**Chemistry**

What is the freezing point of a solution of 1.17g of 1-naphthol, C10H8O, dissolved in 2.00ml of benzene at 20 degrees C? The density of benzene at 20 degrees C is 876g/ml. Kf for benzene is 5.12 degrees C/m, and benzene's normal freezing point is 5.53 degrees C.

**Physics**

An object with mass 0.250 kg is acted on by an elastic restoring force with force constant 10.8 N/m. The object is set into oscillation with an initial potential energy of 0.150 J and an initial kinetic energy of 6.00×10−2 J. What is the amplitude of oscillation? ...

**math**

5 yards= 180 in So 5 yards is greater

**Algebra**

use FOIL (2x^5-6)(x^6-3) My answer is -10x^22-18...but I am not sure that is right. Could someone please help.

**computer/internet**

LTE vs 3G and HSPA?

**Litracy**

HELP!!! I don't remember how to make a dam sonnet with 10 syllables?

**Math**

Hi do the following sets have the same cardinality, why or why not? N= 1,2,3,4,5,6,7... N-2= blank, blank, 3,4,5,6,7... So basically the numbers from 3 to 7 match up in both sets, but in N-2 the first two are empty. I think they have the same cardinality but I don't know ...

**Chemistry**

moles*

**Chemistry**

how do you figure out the moled without its molecular mass

**separation of variables**

solve the value problem by separation of variables dy/dx=x^2/y when y=-5 and x=3

**separation of variables**

is the answer to find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7 y=7e^(x^4)

**Chemistry**

I do not know how to get the products from the left half of the equation. After that I am pretty much fine, except for I don't know how to determine the charge of certain compounds.

**Chemistry**

Write a balanced chemical equation (molecular equation). Write a total ionic equation. write a net ionic equation. (NH4)2 SO4(aq)+Na2CO3(aq) -->

**Hot-air balloon**

A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate of change of the ...

**maths**

thank you

**maths**

what is the circumference the radius the arc the chord the diameter

**Calculus**

A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate of change of the ...

**Social**

Key difference/s between the 1929 Crash and previous stockmarket crashes was/were A) The impact of the investor's pools B) That many middle income people were stockholders C) All of the choices D) The government's intervention I think it's all of the choices, but I...

**math**

matt used centimeter cubes to make a solid that had a volume of 5 cubic centimeters and a surface area of 22 square centimeters. what might his solid looked like?

**math**

3/4 x 5/7, but that means you presume you took out a blue marble the first time. How do you know that you didn't take out a red marble, so you still have all six blue marbles when you pick the second time?

**math**

If there are 6 blue marbles and 2 red marbles in a bag, what is the probability of picking a blue marble then another blue marble if you do not replace the first marble P(B,B)? 3/4 x 5/7 or is it 3/4 x 6/7?

**Math**

x/(x^2-16)-6/(x^2+5x+4)

**geometry**

Circle O above has a circumference of 240 cm and arc XW has a length of 60 cm. What is the measure of the central angle associated with arc XW?

**Economics**

As the aggregate price level falls, the number of domestic products purchased by foreigners will [rise], causing the quantity of domestic output demanded to [rise]. This is known as the [foreign purchases effect]. The first two blanks can be rise,fall or stay the same. and the...

**Chemistry**

If 15.0ml of a 6.0M HCl solution is diluted to 75.00ml, what is the molarity of the diluted solution?

**Physics**

For the reaction: C4H10 + O2 ¨ CO2 + H2O ( is this balanced?) , how many moles of CO2 is formed when 5.00 moles C4H10 reacts with O2? A. 5.00 B. 1.25 C. 20.0

**chemistery**

suppose that "element a" has a valence number of 3 and "element b" has a valence number of 2. if the two elements combine, then when writing the formula for the resulting compound what subscript number will be given to "element b"?

**Chemistry**

If i titrated 25.0mL of 0.500M HCl with 0.500M NaOH and then 25.0mL of 0.500M of an unknown weak acid HA with 0.500M NaOH. How would the two titration curves compare at 10 or 15mL of NaOH Beyond equivelance pts? I think that they will be the ssame or similar but i don't ...

**Chemistry**

I don't know how to get the mole ratios of the following: Copper to Chloride Zinc to Chloride Zinc to Copper There are the moles I have of each; Copper 4.25*10^-3 mol Zinc 3.67*10^-3 mol Chloride 2.27*10^-2 mol

**Chemistry (Stoichiometry)**

a) Mg + 2H2O ==> Mg(OH)2 + H2

**biology**

So is there an error in the book?

**biology**

A question in Campbell's 8th edition study guide for AP Biology says: A multifactorial disorder _. Answer: has a collection of symptoms traceable to an epistatic gene. There is another answer choice which says : has both genetic and environmental causes. Shouldn't the ...

**Chem**

If you prepared a solution by adding 0.05mL (1drop) of 0.5M HCL to 5 x 10^7 mL of "pure" water. Calc the resultant PH. The answer isn't ph= 9.3. you have to add all the hydronium ions from all sources... but how ?

**Chemistry**

A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl (aq) . When the liberated H2 (g) is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 301 mL . The vapor pressure of water at 29 degrees celsius is 30.0 ...

**Calculus AB**

Solve the differential equation: dy/dx= (x^2+y^2)/(2xy) I know how to solve this type of problem, but I am struggling getting all of the x's and y's on different sides of the equation. Thank you for your help.

**Calculus AB**

Sorry I know this should be easy, but what is the integral of U/du?

**Calculus AB**

Please find the integral for: (2^(-1/t))/(t^2) Thank you very much

**Calculus AB**

Find the indefinite Integral of: (e^(2x)-e^(-2x))/(e^(2x)+e^(-2x))dx Thank you very much for your help.

**calculus**

Find the derivative of the inverse for the function f and real number a. f(x)=xrad(x-3) a=4 Please help. Thank you very much for your time and assistance.

**southuniversity**

You have been hired as the marketing manager. Research and identify major approaches of how innovations like these are adopted by consumers. Discuss how the marketing strategy for the car needs to rapidly move through these processes. Who or what are the key groups that need ...

**Chemistry**

A piece of dry ice (solid carbon dioxide) with a mass of 25.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a temperature of 18 degrees Celsius...

**Chemistry**

A piece of dry ice (solid carbon dioxide) with a mass of 25.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a temperature of 18 degrees Celsius...

**Physics**

A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 3.1 s, at what amplitude of motion will the block and piston separate? (b) If the piston has an amplitude of 9.6 cm, what is the maximum frequency for which the block and...

**Math**

161.8

**government**

Students are to read up on the role of Hezbollah as a political force in Lebanon. Due to Lebanon's geographical position, economy, and politics, would an Egyptian style revolution beneficial or detrimental to the US government? Acting as the president's Security ...

**chemistry**

A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice that the reaction...

**chemistry**

A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice that the reaction...

**Chemistry**

What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

**organic chemistry**

Im working on a lab dealing with NRM of C3H8O2. carbons are 57.5 (q) , 60.1 (t), and 73.1 (t) i forget how to find the basic structure.

**physics**

Two cars are traveling in opposite directions on a two lane road. Car A starts from the origin at t =0 and accelerates (moving due East) from rest at 4 m/s2. At t = 0, Car B is moving due West with a velocity of 15 m/s and is 500 m east of car A but accelerating toward the ...

**physics**

A pendulum clock has a heavy bob supported on a very thin steel rod that is 1.00000 m long at 18.0celcius. 1 - what is the clock's period if the temperature increases by 11.0 celcius? Assume that coefficient of linear expansion of steel is 1.20×10−5K ^-1 . 2 - ...

**pre- algebra**

1=3^-2 x 3^x

**maths**

if the diameter of a bike wheel is 20cm, what's the minimum number of revolutions needed to cover 1km?

**chemistry**

How do you find the rate(mole rxn/L s) from .00014 M or Iodine, .57 M or acetone, and .18 M of H+ and 16.8 seconds?

**math**

A man is 6ft tall is standing 10 feet from the base of a lamp post. The mans shadow has a lenght of 4ft . How tal is he lamp post

**Physics**

A dockworker applies a constant horizontal force of 79.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 13.0 m in a time 4.50 s. What is the mass of the block of ice?If the worker stops ...

**Physics**

A dockworker applies a constant horizontal force of 79.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 13.0 m in a time 4.50 s. What is the mass of the block of ice?If the worker stops ...

**grammar**

find the predicate nominative or predicate adjective. The photos throughout the book look fascinating.

**Math (Calculus AB)**

If y=cos^2x-sin^2x, then y'= a) -1 b) 0 c) -2(cosx+sinx) d) 2(cosx+sinx) e) -4(cosx)(sinx) I thought the answer was C but the answer key says it is E. Please help. Thanks in advance.

**Math (Calculus AB)**

An equation to the graph of y=x^3+3x^2+2 at its point of inflection is: a) y=-3x+1 b)y=-3x-7 c)y=x+5 d)y=3x+1 e)y=3x+7 Please help. I am in urgent need.

**Math (Calculus AB)**

For x≠0, the slope of the tangent to y=xcosx equals zero whenever: (a) tanx=-x (b) tanx=1/x (c) sinx=x (d) cosx=x Please help. I have a final tomorrow and I am working diligently to understand every type of problem that may show up on my test. Thank you very much.

**Math (Calculus AB)**

For x≠0, the slope of the tangent to y=xcosx equals zero whenever: (a) tanx=-x (b) tanx=1/x (c) sinx=x (d) cosx=x Please help. I have a final tomorrow and I am working diligently to understand every type of problem that may show up on my test. Thank you very much.

**Physics**

that is easy actually..... d(distance)= 1/2at^2 +v(initial)t, where a-acceleration, t-time. v-initial here is 0 because the car starts from rest....so d= 1/2at^2 which is .5(3.5)(3.6^2)...which comes out to 22.68m I believe

**reading**

What's the question then? It doesn't say the question, how are we supposed to help?

**Math**

Find the value of the constant t such that the triangle formed by A (2,2) ,B (4,-5) ,C (6,t) is right angled at B(4,-5).

**english**

take the first definiton then double the consanant you idiot

**physics**

a 2kg mallet is dropped from a height of .6m onto a nail, driving it 3.5 cm into the wood. What is the average force exerted by the mallet on the nail? thanks

**geometry**

In triangle abc, ab=5 bc=9 and ac=8 Choose the angle measures from greatest to least

**math**

Camilla has 3 times as many points as Lynn. Lynn has 5 more points than Kim. Camilla, Lynn, and Kim combined have twice as many points as Jasmine. If Jasmine has 25 points - how many points do the three other girls have?

**Social Studies**

how did helen thomas feel about watergate? if u could also tell me where u found the answer that would help, thanks

**Nuclear Physics**

If a polonium-210 (Po-210) atom has just decayed, how close can the ejected alpha particle get to a neighboring Po-210 nucleus? Hint: W = F*r F=kq1q2/r2

**chemistry**

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed B) two ...

**chemistry**

I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed B) two particles...

**algebra**

Tom's mother pays him $.50 for each problem his gets correct on his test, but he has to give her .25 for each problem he gets wrong. If Tom makes $8.00 on the test, and there were 25 total problems on the test, how many did he answer correctly? Thanks!

**physics**

How much potential energy does a 20-kg barrel have when it is in the truck whose floor is 5.0 m above the ground?

**Geometry**

In right triangle ABC, the median to the hypotenuse has length 15 units and the altitude to the hypotenuse has length 12 units. What is the legth of the shorter leg of triangle ABC?

**science**

based on the relationship between mass and volume.... How much space would 75 grams of water occupy?

**chemistry**

suppose you have an unknown gas, and wish to determine whether it may be ammonia, hydrogen or carbon dioxide. Describe tests you might use to prove the existence of each of these gases.

**Physics**

A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 42 dB by an observer 10 km away. (a) What is the average power generated by the horn? W (b) What intensity level of the horn's sound is observed by someone waiting at an ...

**chemistry**

what is the wavelength of an electron traveling at 1.65% of the speed of light?

**8th grade**

An alloy of metals is 25% copper .Another alloy is 50% copper. How much of each alloy should be used to make 1000grams of an alloy that is 45% copper?

**chemistry**

The strongest intermolecular forces present in a sample of pure I2 are A. covalent bonds. B. covalent network bonds. C. metallic bonds. D. dipole–dipole forces. E. London forces.

**Geometry**

Given:JG/HG =KG/IG, ∠1 ≅∠2 Prove: EF ll HI /Users/szeringue/Documents/#6.doc