# rebekah

Popular questions and responses by rebekah-
## chemistry

what is the cation and anion of Na3PO4? thanks

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

# 1 a special window has the shape o a rectangle surmounted by an eqilatera tiangle. ifthe perimeter o the winow is 16 ft, what dimensions will admit te most light (area of triangle= suarre root of 3/4 times x2.

*asked on September 30, 2012* -
## Physics

Your lab partner says that a battery provides not a source of constant current, but a source of constant voltage. Do you agree or disagree and why? Also I am really confused with series and parallel circuits like when voltage, current, and resistance

*asked on April 14, 2012* -
## 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* -
## 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* -
## Precalc

#1 For what positive numbers will the cube of a number exceed four times its square? #2 For what positive numbers will the cube of a number be less than the number? thanks

*asked on October 21, 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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

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* -
## 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* -
## pre calc

f(x)=-3x+2 a) express the slope of the secant line of each function in terms of x and h. b) find msecant for h=.5, .1, and.01 at x=1. c) find the equation for the secant line at x=1 with h=1.01 I got -3 for a but don't know how to do the others becaus a

*asked on September 9, 2012* -
## chemistry

If 1.68 L of water is initially at 25.0 °C, what will its temperature be after absorption of 6.8 10-2 kWh of heat? I don't know how to set it up because i have the equation q= m times c times change in temp (the triangle and the a T is the symbol for

*asked on September 15, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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

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

The gas phase reaction between nitrogen gas and oxygen gas to give NO gas is an endothermic process since 180.8 kJ of heat energy is absorbed when 1 mol of nitrogen reacts with 1 mol of oxygen. In which direction will the equilibrium be shifted if the

*asked on April 20, 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* -
## chemistry

what is the cation and anion of Na3PO4? thanks

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

Predict how many electrons will most likely be gained or lost by each of the following elements. Al I know it loses but how many?

*asked on September 24, 2010* -
## chemistry

When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 12.0 fluid ounce drink from 75°F to 35°F, if the heat capacity of the drink is 4.18 J/g·°C? (Assume that the heat transfer is 100% efficient.) please explain realy realy

*asked on September 15, 2010* -
## Science

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

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

6,840 customers in 45 days?

*asked on September 10, 2019* -
## 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* -
## 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* -
## 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* -
## 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 6, 2013* -
## Pre calc

Write the equation in standard ellipse form and graph. 34 x^2 -24xy +41y^2 +41 y^2 -25= 0. i got x= (4 x prime- 3 y prime)/5 and y=(3x prime +4y prime)/5 but cant get the correct math when I plug that into the original equation. Also I need help finding

*asked on May 5, 2013* -
## 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* -
## check my precalc

Rewrite each of the following as a product of linear factors 1. x^2+3 My Answer: (x+iroot 3)(x-iroot3) 2. x^2-2x+3 MA: (x-(1+iroot2))(x-(1-iroot2)) 3. x^4+x MA: IM not sure how to do it! can you help? 4. x^5-x^4+5x^3 MA:

*asked on November 1, 2012* -
## 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* -
## precalc

#1 For what positive numbers will the cube of a number exceed four times its square? #2 For what positive numbers will the cube of a number be less than the number? thanks

*asked on October 21, 2012* -
## check my precalc

#1. Make up a polynomial that has the following characteristics: crosses the x axis at 1 and 4, touches the x axis at 0 ad 2. and is above the xaxis between 0 and 2. I did (x+1)(x-4)(x^2)(x-2)^2 #2. its an illustration but one of the queestino says what is

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

The complete combustion of octane, C8H18, the main component of gasoline, proceeds as follows. 2 C8H18(l) + 25 O2(g) ¨ 16 CO2(g) + 18 H2O(g) Octane has a density of 0.692 g/mL at 20‹C. How many grams of O2 are required to burn 26.5 gal of C8H18? i

*asked on October 6, 2012* -
## Precalc

#1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain, range, where increasing and decreasing. I got.... vertex: 2,4 axis of sym: x=2 D= (-infinity, infnity) range= [4,infinity) im stuck of the intercepts because when i plug i 0 for x i get

*asked on September 25, 2012* -
## Check my precalc?

#1: f(x) = x^2-4x find vrtex, axis ofsym, y-int, x-int if any, domain, range, where increasing and decreasing. I got.... vertex: 2,4 axis of sym: x=2 D= (-infinity, infnity) range= [4,infinity) im stuck of the intercepts because when i plug i 0 for x i get

*asked on September 25, 2012* -
## Simple how-to to do in french?

For my french class i have to do alittle how-to for around 5 min. It has to be something I can explain to the class in french and then the rest of the class make or participate in. I am in french 4. I was thinking of making a unique type of paper airplane

*asked on February 27, 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* -
## Math for Liberal Arts

You have a 5 minute hour glass and an 8 minute hour glass. You need to cook something for exactly 9 minutes. How will you use the two hour glasses to determine the exact time? There is no way to determine where the halfway mark is with the hourglasses.

*asked on December 13, 2011* -
## random question

what words have the word or sound of 'mole' in the. this is for a science project i am doing. we are given out lines of the animal a mole and we have to make a mole but have like a theme to it kinda. like someone did a camel(camole) thanks

*asked on May 9, 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* -
## 1950's Food

For english im in a group that is doing a presentation on 1950 food. Were going to be making rice crispy treats and bringing them in since that was a popular dessert during the time. but we want to make it.. for lack of a better word, interesting. so does

*asked on April 25, 2011* -
## 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

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

calculate the freezing and boiling points of each of the following solutions. (a) 0.37 m glucose in ethanol freezing point ______I got -1.2e2 but its wrong_______°C boiling point _________I got 1.1e2 but its wrong:(____°C (b) 15.0 g of decane, C10H22, in

*asked on March 24, 2011* -
## Chemistry (repost)

Determine the volume of 0.240 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is shown below. H2SO4(aq) + 2 KOH(aq)---> K2SO4(aq) + 2 H2O(l) a) 26 mL of 0.240 M H2SO4 b) 143 mL of 0.14 M

*asked on March 19, 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* -
## science

Of HOOH(s) and TiO2(s) which one has the higher melting point?

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

how do i figure this out?? How much heat does your body lose when 2.46 g of sweat evaporates from your skin at 25°C?

*asked on February 22, 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* -
## chem

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

*asked on January 6, 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* -
## 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* -
## Chemistry

In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor? (Water vapor is the only product.) I am really confused on how to do this.

*asked on September 11, 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* -
## chemistry

how do you convert joules to kilojoules? example: 2240.48 joules 3887.4 joules 13.85 joules

*asked on November 15, 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

45.5 meters in 13 seconds???

*asked on September 10, 2019* -
## 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* -
## 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. 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* -
## 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* -
## 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* -
## health/stats

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

*asked on October 17, 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Persuasive Speech

I am doing a speech on why my college should add more bus shelters to the bus stops. So far I have a few points about more students using buses so less pollution and protecting students from the elements, talking about how if they are dressed nice for a

*asked on April 4, 2014* -
## Speech- Statistic needed

Does anyone know of any websites that have statistics on the number of people that volunteer for disaster relief in the us?

*asked on March 24, 2014* -
## Econ

When considering economic growth, many policy makers focus on real GDP per capita since it takes into account the potentially distorting effects of ______________ and ________________. Any large, sustainable increase in real GDP must be the result of

*asked on February 18, 2014* -
## econ

The International Disc Jockey\'s Union has a wage contract that stipulates a yearly wage increase based on the Consumer Price Index. If this year\'s wage is $25.00, the current CPI is 180, and the contract was first signed in the base year, what was the

*asked on February 11, 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* -
## 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* -
## Calculus

solve for dv/du dQ/du= 38u + [(u+v)^2(18+19dv/du) -(2(18u+19v)(u+v)(1+dv/du)]/ (u+v)^4 u=10 v=25 I am confused how u solve for the dv/du in this big equation and reducing and stuff like that thanks!! this is about implicit di

*asked on October 7, 2013* -
## Calc

find the second derivative f(x)= 1/(4u^2-3)^2

*asked on October 2, 2013* -
## calculus

Find the derivative... 1) f(u)= 1/ (2u^2-1)^2

*asked on October 2, 2013* -
## english

who is the audience for the comic book are you my mother?

*asked on September 18, 2013*