# Rebekah

Popular questions and responses by Rebekah-
## Chemistry

At 40 degrees Celsius, the value of Kw is 2.92 X 10^-14 a.) calculate the [H+] and [OH-] in pure water at 40 degrees celsius b.)what is the pH in pure water at 40 degrees celsius c.)if [OH-] is .18M , what is the pH

*asked on December 21, 2007* -
## chemistry

what is the cation and anion of Na3PO4? thanks

*asked on November 23, 2010* -
## chem

Which of the following compounds would be expected to form intermolecular hydrogen bonds in the liquid state? (Select all that apply.) HCO2H CH3OCH3 (dimethyl ether) CH3CO2H (acetic acid) CH3OH (methanol) thanks:)

*asked on February 26, 2011* -
## Trigonometry

A boy is twirling a model plane on a string that is 2 meters long. If he twirls the plane at 0.4 revolutions per second, how far does the plane travel in 5 minutes? Give your answer in meters to 2 decimal places.

*asked on November 6, 2014* -
## Math Help? Check my answers.

1. You mix the letters: S E M I T R O P I C A and L thoroughly. Without looking you draw one letter. Find the probability that you select a vowel. From a fraction to simplest form. 12/5 5/12 1/3 7/12 2. You roll a standard cube once. Fine P(0) 7/6 1 1/2 0

*asked on May 14, 2013* -
## Finance

Your firm is considering the following three alternative bank loans for $1,000,000: a) 10 percent loan paid at year end with no compensating balance b) 9 percent loan paid at year end with a 20 percent compensating balance c) 6 percent loan that is

*asked on November 17, 2012* -
## chem

What type(s) of intermolecular force is (are) common to each of the following. (Select all that apply.) 1) Xe and methanol (CH3OH) a)london-dispersion forces b)dipole-dipole c)hydrogen bonding i put a and b but it was wrong 2)CH3OH and acetonitrile (CH3CN)

*asked on February 24, 2011* -
## Calculus

At a certain factory, output Q is related to inputs u and v by the equation Q= 17u^2+(16u+17v)/(u+v)^2 If the current levels of input are u= 10 and v = 25, use calculus to estimate the change in input v that should be made to offset a decrease of .7 unit

*asked on October 8, 2013* -
## Precalc

Find a formula for the nth term if... a)the 8th term is 8 and the 20th term is 44 b) the 8th term is 4 and the 18th term is -96 thanks!! I am just confused how you do this if you don't know what n is.

*asked on May 12, 2013* -
## Finance

An important source of temporary cash is trade credit, which does not actually bring in cash, but instead slows its outflow. Vendors often provide discounts for early payment. What is the formula to determine the effective interest rate if the discount is

*asked on November 17, 2012* -
## chem

net ionic equation. Aqueous acetic acid (HC2H3O2) is neutralized by aqueous barium hydroxide. i got H^+(g) + OH^-(g) --> H_2O(l) but it is wrong. are my states of matter wrong?

*asked on October 13, 2012* -
## Math

Can anyone help me with this? A homeowner wants to build a circular patio. If the diameter of the patio is 20 feet, what is its area to the nearest whole number? A)1,257 B)314 C)63 D)31

*asked on April 11, 2016* -
## MATH HELP?!?!?!

1. Maria has the following scores in her mathematics class: 86 75 97 58 94 and 58 a: Find the mean median and mode b: Should Maria's Mathematics class teacher use mean median or mode of the exam to convince Maria that she needs to study more regularly? 2.

*asked on May 8, 2013* -
## Finance

Community Hospital has annual net patient revenues of $150 million. At the present time, payments received by the hospital are not deposited for six days on average. The hospital is exploring a lockbox arrangement that promises to cut the six days to one

*asked on November 17, 2012* -
## Chem

Consider the exothermic reaction CoCl42-(aq) + 6 H2O(l) --> Co(H2O)62+(aq) + 4 Cl -(aq). Will the equilibrium concentration of CoCl42- increase or decrease when the following changes occur? (a) HCl is added. increases decreases .(b) Co(NO3)2 is added.

*asked on April 19, 2011* -
## chem

Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution? (Select all that apply.) NaCN and HCN NaCN and NaOH HCN and NaOH HCl and NaCN HCl and NaOH I thought it was the middle three

*asked on April 10, 2011* -
## Pre Calc

Alice throws a ball straight up with an initial speed of 40 feet per second from a height of 5 feet? a) Find parametric equations that model the motion of the ball as a function of time. b) How long is the ball in the air? c) When is the ball at its

*asked on May 7, 2013* -
## chem

Give the conjugate base of the following Bronsted-Lowry acids. (Type your answer using the format CO2 for CO2, [H2AsO4]- for H2AsO4-, and [Ni(CN)4]2- for Ni(CN)42-.) 1) H2SO4 I have tried H[SO4]- and just HSO4 but they are both wrong:(

*asked on March 31, 2011* -
## math

Given: segment AC and segment BD bisect each other at E prove: E is the midpoint of segment RS i don't know if you will be able to visualize the picture but just incase someone is i really need help on the proof for this one. Picture: two(supposedly

*asked on October 23, 2010* -
## Econ

1. When Joe started his job at the laundromat 5 years ago, his wage was $5.50 an hour. Today his wage is $8.50 an hour. If Joe started his job in the base year, and his real wage is the same as when he started, what is the Consumer Price Index today? 2.

*asked on February 11, 2014* -
## chemistry

How many hydrogen atoms are present in 1.02 mg of aspartame? I already got that there are 2.08e18 molecules of aspartame in 1.02mg of aspartame but i am not sure how to find how many atoms of hydrogen there are

*asked on September 29, 2012* -
## Chem

Use the following reactions to arrange the elements A, B, C, and D in order of their redox activity, from greatest to least. 2 A + B2+ --> 2 A+ + B B + D2+--> B2+ + D A+ + C -->No reaction 2 C + B2+ --> 2 C+ + B Can someone explain? thanks

*asked on May 8, 2011* -
## Chemistry

Of each pair of solids, which one has the higher melting point? a) HCl and KCl b) Cu and Kr. Can you please explain? How do you know the melting point? Is it the type of intermolecular force that they have? thanks!

*asked on February 28, 2011* -
## chemistry

what is the cation and anion of Na3PO4? thanks

*asked on November 28, 2010* -
## calculus

500-gallon tank initially contains 200 gallons of brine containing 100 pounds of dissolved salt. Brine containing 2 pounds of salt per gallon flows into the tank at the rate of 4 gallons per minute, and the well-stirred mixture flows out of the tank at the

*asked on June 27, 2016* -
## Trigonometry

Suppose that Lance Armstrong1 is using a 180 mm chain ring and pedaling at a rate of 80 revolutions per minute. The wheels on his road bike have a diameter of 622mm. What diameter sprocket on the rear wheel does he need to maintain a speed of 30 kilometers

*asked on November 6, 2014* -
## Statistics

Event A occurs with probability 0.1 and event B with probability 0.5 A) What is the maximum probability that the intersection of A and B can have? B) What is the minimum probability that the intersection of A and B can have? C) If it is know that P(A

*asked on September 6, 2014* -
## Calc

Write a deferential equation describing the given situation. The rate at which the concentration of a drug in the bloodstream decreases is proportional to the concentration. Let Q(t) be the concentration of the drug at any time t and k be a positive

*asked on April 16, 2014* -
## Calc

The temperature of a chemical reaction, t seconds after the reaction starts, is given by: T(t)= 20+5.25t^.75 degrees F , What is the average temperature during the whole process, if the reaction lasts for 4 minutes and 16 seconds ?

*asked on February 9, 2014* -
## chem

Because the oxide ion is basic, metal oxides react readily with acids. (a) Write the net ionic equation for the following reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.) FeO(s) + 2 HClO4(aq)

*asked on October 29, 2012* -
## satp conditions

Calcium hydride reacts with a vast excess of water to form calcium hydroxide and hydrogen gas. (See the periodic table.) (a) Write a balanced chemical equation for the reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP

*asked on October 4, 2012* -
## English

Assignment: Type impressions, feelings, and thoughts in a one-page diary entry. Recall your earliest experiences with art. What did you do? Did you enjoy art? Why? How did your parents or teacher respond to your art? How do you feel at present about your

*asked on December 12, 2011* -
## chem

true or false?? a)If there are no changes in the oxidation state of the reactants or products of a particular reaction, that reaction is a redox reaction. false? b)A reducing agent gets oxidized as it reacts. true?

*asked on May 3, 2011* -
## Chem

(a) The molar solubility of Ag2CrO4(s) at 35°C is 1.3 10-4 mol/L. Calculate Ksp. (b) If 0.0490 g of AgIO3 dissolves per liter of solution, calculate the solubility-product constant. (c) Using the appropriate Ksp value from Appendix D, calculate the

*asked on April 27, 2011* -
## Check my answers? (Chemistry)

I only get one chance for each of these questions so I was wondering if someone could check my answers, thanks! 1. Consider the following reaction at equilibrium. 2 BrNO(g) ---> 2 NO(g) + Br2(g) Predict the effect of the following changes to the reaction

*asked on April 19, 2011* -
## chem

Consider the following reaction. 2 NO(g) + 2 H2(g) N2(g) + 2 H2O(g) An equilibrium mixture of this reaction at a certain temperature was found to have [NO] = 8.1 10-3 M, [H2] = 4.1 10-5 M, [N2] = 5.3 10-2 M, and [H2O] = 2.9 10-3 M. What is the value of the

*asked on April 15, 2011* -
## chemistry

What intermolecular force(s) must be overcome to do the following. (a) sublime ice hydrogen bonding dipole-dipole interactions (not hydrogen bonding) induced-dipole/induced-dipole forces ion-dipole force You can choose one. Can some one please explain. I

*asked on February 26, 2011* -
## Chem

(b) If the natural abundance of Ag-107 is 51.84%, what is the natural abundance of Ag-109? % (c) If the mass of Ag-107 is 106.905, what is the mass of Ag-109? amu I really need help. Can u say the answer then explain how you got it? Thanks:)

*asked on September 26, 2010* -
## Chem

(b) If the natural abundance of Ag-107 is 51.84%, what is the natural abundance of Ag-109? Thanks

*asked on September 26, 2010* -
## Science

how do you draw a the amino acid Phenylalanine? thanks:)

*asked on November 21, 2009* -
## chemistry

the following reaction has a Kp = 109 at 25 degrees C 2NO(g) + Br2(g) reversible 2NOBr(g) If the equilibrium partial pressure of Br2 is 0.0159 atm and equil pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equlibrium. What are the

*asked on December 3, 2007* -
## criminology

I am writing an argument of why there shouldn't be greater punishment for hate crimes vs. not done out of "hate." and am trying to find some stats and sources to back it up. I tried searching the recidivism rate of hate crimes vs. non hate crimes but can't

*asked on December 9, 2017* -
## Business, Accounting

A firm has a debt to equity ratio of 50%, debt of $300,000, and net income of $90,000. The return on equity is a. 60% b. 15% c. 30% d. not enough information

*asked on February 25, 2015* -
## health/stats

can cholesterol follow a normal distribution exactly? why or why not?

*asked on October 17, 2014* -
## Calc

Consider the following: f(x)= the intergral of ((3-xe^x)/x )dx If the integration constant, C , is zero, then the value of f (1) is ????

*asked on February 9, 2014* -
## Precalc

For #1-3, an angle of rotation and ( x prime, y prime) coordinates are given. find the (x,y) coordinates? 1. angle= 30 degress, ( root 3, 2) 2. angle= 60 degrees, (-1,1) 3. angle = 45 degrees, ( root 2, - root2)

*asked on April 30, 2013* -
## Someone please help me with science?

1. Which of the following shows the correct sequence of energy transformations when listening to the radio? electrical; kinetic; sound; kinetic; electrical electrical; sound; kinetic; sound; electrical sound; electrical; kinetic; electrical; sound kinetic;

*asked on April 16, 2013* -
## Literature Help?

Which of the following sentences is correct? (1 point) At the slumber party, everybody were asleep after midnight. No one likes to be uncomfortable while sleeping. Each guest have a sleeping bag and a pillow.

*asked on April 16, 2013* -
## precalc help

Find the exact value without a calc 1. log base 3 of 8 times log base 8 of 9. I started by changing both bases to 10 but don't know what to do from there. 2. e ^ log base e^2^9. I hope that isnt confusing. My teacher said we are suppose to get the bases

*asked on November 21, 2012* -
## adv comp/foods

I have to review a restaurant. What criteria should i include in my paper?

*asked on October 23, 2012* -
## chem

Aspirin (C9H8O4) is produced from salicylic acid (C7H6O3), and acetic anhydride (C4H6O3): C7H6O3 + C4H6O3 ¨ C9H8O4 + HC2H3O2 . (c) What is the theoretical yield of aspirin if 189 kg of salicylic acid is allowed to react with 128 kg of acetic anhydride?

*asked on October 7, 2012* -
## precalc

is the degree of a polynomial the number of x's or just the highest numbe of x's in a monomial ex: f(x)=-3x^2(x+2)^3

*asked on October 4, 2012* -
## check my precalc

State if it is a polynomial. If yes, say the degree. 2.f(x)=5x^2 +4x^4 4.f(x)=3-(1/2x) 6.f(x)=x(x-1) 8.f(x)=sqaure oot of x (square root of x-1) 10.f(x)=(x^2-5)/x^3 12. f(x)=-3x^2(x+2)^3 my answers 2.yes, 6 4.yes, 1 6.yes, 3 8.no 10.no 12.yes, 5 thanks!!

*asked on October 4, 2012* -
## bio- botony

The water pressure that pushes water and sugar from sugar source to sugar sink is referred to as _____. The answer is bluk flow but idk why. Why isnt i translocation or transpiration?

*asked on October 2, 2012* -
## chemistry

A sample of the male sex hormone testosterone, C19H28O2, contains 4.09 1021 hydrogen atoms What is the mass of this sample in grams? i got 0.0697g but its wrong

*asked on September 30, 2012* -
## pre calc

I have a few problems from my homework that I am having trouble with. #1 Find the difference quotient of f foreach function f(x)=1/(x+3) I got -2x+6 #2 Express the area of an isosceles right triangle as a function of the length x of one of the two eual

*asked on August 30, 2012* -
## speech

I am looking for an attention getter for my imformative speech about dog-human communication, In the speech, I am going to be talking about verbal and non verbal dog behaviors and then how dogs repond to human verbal and non verbal behaviors. I was

*asked on February 24, 2012* -
## Speech

Whether it’s shopping for the newest fashion, dining at a high quality restaurant, or spending the night at a world-class hotel, the Magnificent Mile is the place to go. does this sentence have a triad in it? thanks

*asked on February 5, 2012* -
## Bio

Do you guys know of any videos that describe how to tell what bacterias on a slide are bacillus cereus, seratia marsescens, e coli, sarcina lutea and bacillus subtilis? thanks

*asked on January 25, 2012* -
## french book

I have homework in my French book but left it at school. I use the Imaginez: le français sans frontières. There is an online version but it says I needa code. I don't have my book with me so I can't get the code from there. is it a common code that can

*asked on January 19, 2012* -
## English- dracula

What are some examples of moral seriousness in dracula?

*asked on November 22, 2011* -
## physics

A car moving with constant acceleration covered the distance between two points 60.0 m apart in 6.00 s. Its speed as it passed the second point was 15.0 m/s. (a) What was the speed at the first point? (b) What was the magnitude of the acceleration? (c) At

*asked on September 10, 2011* -
## Chem

Assign an oxidation state to each atom in each of the following compounds. Fe(CN)3 Fe: 3+ (i know this is correct) C N im not sure about the other two

*asked on May 5, 2011* -
## Chem

(c) Using the appropriate Ksp value from Appendix D, calculate the solubility of Cu(OH)2 in grams per liter of solution. Appendix D: Ksp for Cu(OH)2 = 4.8 x 10-20 thanks!

*asked on April 27, 2011* -
## chem

Indicate the type of crystal (molecular, metallic, covalent-network, or ionic) each of the following would form upon solidification. 1. B

*asked on March 1, 2011* -
## chem

is SiS2 polar or nonpolar? Why? I think its non but when I searched it people were saying polar thanks:)

*asked on February 3, 2011* -
## Any suggestions for easy french dessert?

ok so for my school we have this thing called OCMC (One Community Many Cultures) and I have to make a poster and then for extra credit I can make a french food. I wanted to make a french dessert (Something that doesnt have to be hot or cold and can sit in

*asked on February 2, 2011* -
## chem

What is the frequency of radiation whose wavelength is 19.80 ? thanks:)

*asked on January 6, 2011* -
## chem

One could easily determine a single bb's mass by simply weighing it or by weighing 100 BBs and dividing the mass by 100. Why couldn't Robert Millikan use this procedure to measure the charge of an electron? Thanks:)

*asked on September 23, 2010* -
## quick chemistry

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. What is solid B

*asked on September 4, 2010* -
## History

Do you think modernization was a positive or negative movement in the Ottoman Empire? Why?

*asked on July 13, 2010* -
## Biology

What kinds of cells make it difficult to tear fern leaves from a plant? thanks:)

*asked on April 28, 2010* -
## Biology

What are some treat ments for Miller Syndrome? If you found a website that would be great. I already know of NINDS and FACES websites. thanks:)

*asked on April 5, 2010* -
## Biology

What are the treatments for Miller Syndrome. A website would be nice:) Thanks!

*asked on March 31, 2010* -
## Algebra

A grocer mixes together some cashews costing 8$ per kilogram with some nuts costing 10$ per kilogram. The grocer sold 12 kg of the mixture for 8.50$ per kilogram. How many kilograms of cashews were in the mixture? I have to find 2 equations then find the

*asked on November 16, 2009* -
## World History

Is the story of how the Trojan war started with Helen, and Paris in the Iliad? Thanks:)

*asked on November 7, 2009* -
## English

In a free verse poem do you need punctuation?

*asked on October 20, 2009* -
## chemistry

I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab. mass of Mg: .021 g temp: 295K barometric pressure: 29.87 inches Hg volume of H2 gas: the difference between tiop water level in eudiometer = 322 mm the

*asked on October 25, 2007* -
## chemistry

I need to calculate the pressure exerted by the hydrogen in an eudiometer for a weighing by redox lab. mass of Mg: .021 g temp: 295K barometric pressure: 29.87 inches Hg volume of H2 gas: the difference between tiop water level in eudiometer = 322 mm the

*asked on October 25, 2007* -
## Math

45.5 meters in 13 seconds???

*asked on September 10, 2019* -
## Math

6,840 customers in 45 days?

*asked on September 10, 2019* -
## Math

45.5 meters in 13 seconds???

*asked on September 10, 2019* -
## Writing Sources

I am trying to prove why I think parents having a child reduces their rate of commiting a crime. My basic reasoning is that most parents love their new child and start to realize that they need to better their life in order for their childeren to have the

*asked on October 26, 2017* -
## calculus

Find the general solution of the equation. 6t*dy/dt+y=sqrt (t),t>0.

*asked on June 27, 2016* -
## Music

Can anyone help me with this question? Franz Schubert quoted the Ländler in his Piano Trio No. 1 in B-flat Major, op. 99, D. 898 by a) writing tumbling, non-metrical rhythms b)changing the meter c) writing alternating 3/4 measures of either notes and

*asked on April 20, 2016* -
## Trigonometry

An aircraft took off at an angle of 32 degrees. How far had it flown when it reached a (vertical) height of 1200m (nearest metre)?

*asked on April 12, 2016* -
## Chemistry

I need help with this question Which would have a higher boiling point? a.1.0 M KNO3 b.1.5 M KNO3 c.0.75M KNO3 d.2.0M KNO3

*asked on April 3, 2016* -
## Chemistry

I need help with this question. If the solubility of a gas in water is 6.0 g/L when the pressure of the gas above the water is 2.0 atm, what is the pressure of the gas above the water when the solubility of the gas is 3.0 g/L?

*asked on April 3, 2016* -
## Chemistry

I need help with this question, I don't know how to set up the formula to work it out? Calculate the dissociation constant of a weak monoprotic acid if a 0.08 M solution of this acid gives a hydrogen-ion concentration of 0.0001 M?

*asked on April 3, 2016* -
## Chemistry

If 210 mL of isopropyl alcohol is diluted with water to a total volume of 300 mL, what is the percent by volume of isopropyl alcohol in the solution? Would it be 70%??

*asked on April 3, 2016* -
## Chemistry

I need help with this question, I don't know how to do it. If 210 mL of isopropyl alcohol is diluted with water to a total volume of 300 mL, what is the percent by volume of isopropyl alcohol in the solution?

*asked on April 3, 2016* -
## Accounting

Chef Gourmet, Inc., has assembled the following data pertaining to its two most popular products. Blender Food Processor Direct material $ 18 $ 33 Direct labor 12 27 Manufacturing overhead @ $48 per machine hour 48 96 Cost if purchased from an outside

*asked on November 5, 2015* -
## Math

A professional baseball team won 84 games. The team won 14 more games than it lost. There were no ties. How many games did the team lose?

*asked on September 8, 2015* -
## Trigonometry

Find these quantities: i. Find all angles in the unit circle with secx=2.1754 . Give your answers in radians to 4 decimal places. ii. Find sec(arcsin(2x))

*asked on November 6, 2014* -
## Atmospheric Science

1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth

*asked on September 11, 2014* -
## Stats

You have many old textbooks in your apartment. You have 6 math books, 7 econ, and 4 accounting. Assume that each textbook is different than the other. A) What is the probability that the last book is one of the economic textbooks? B) What is the

*asked on September 9, 2014* -
## Science of the Atmosphere

What is the temperature of air, given P= 90 kPA and the pressure is 1.0 kg(m^-3)? Thanks!

*asked on September 7, 2014* -
## Science of the Atmosphere

What is the temperature of air, given P= 90 kPA and the pressure is 1.0 kg(m^-3)? Thanks!

*asked on September 6, 2014* -
## physics

Any vector can be written as a unit vector multiplied by the magnitude of the vector (a positive scalar). Write each of the following vectors as the magnitude of the vector times the appropriate unit vector: < 0.00330, 0, -0.00330 >

*asked on June 17, 2014* -
## physics

At a certain instant a ball passes location < 11, 10, -16 > m. In the next 3 seconds, the ball's average velocity is < -8, 37, 30 > m/s. At the end of this 3 second time interval, what is the height y of the ball?

*asked on June 17, 2014*