Saturday

December 10, 2016
Total # Posts: 2,560

**Chemistry**

A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

*March 14, 2013*

**Chemistry**

What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 The ksp expression is 1.50×10^-14=(Ag^+2)^2(SO3^-2)/(Ag2SO3). Is the concentration 3.0×10^-9?

*March 14, 2013*

**Chemistry**

H3BO3 -> H+ + H2BO3- Why doesn't H3BO3 break down to something with H3O+ because it is a weak acid? I know many weak acids break down to something with H3O+ like HCN, C6H5COOH, HNO2, and HF.

*March 12, 2013*

**math**

Tara filled 1/6 of her garden with tomato plants. Dan filled 1/6 of his garden with cucumber plants. How much did they fill in total?

*March 12, 2013*

**SCIENCE**

Above can hardly talk about cheating, in order for you to have found this page you had to search the question, thus you were trying to cheat also. Before you start pointing fingers, make sure your hands are clean.

*March 12, 2013*

**English**

A worker can hear neighbors tapping on computer keyboards, making telephone calls, and muttering under their breath. Is this right or wrong?

*March 11, 2013*

**Algebra**

Thank you to the both of you. I understand now I was getting mixed up. :)

*March 5, 2013*

**Algebra**

Can you please solve this I don't understand I know the answer is b>3 but If you can break it down for me and show work? (: 3b+12>27-2b

*March 5, 2013*

**maths-perimter**

The sides of a hypotenuse are all multiples of the original Pythagorean triple: 3, 4, 5. Obviously in this, 5 is the hypotenuse and in your equation so is 20. To get 20, you have to multiply 5 by four so to get the Pythagorean triple you just need to multiply the original set ...

*March 5, 2013*

**Science**

How does the temperature change in the sun's atmosphere differ from the temperature change in the sun's interior?

*March 4, 2013*

**Math 7th grade**

Katya bought 2 gallons of juice. she drank 2 quarts. how much was left?

*March 3, 2013*

**social studies**

I agree with Chelsea. This is no place to cheat. If you didn't see what the name of site is. its homework 'HELP' and the word help does not mean teachers on here just giving you the answer. Jeez do your own test.

*February 28, 2013*

**Algebra/Math**

Can you show work por favor? :) A metalworker has a metal alloy that is 20% copper and another alloy that is 60% copper. How many kilograms of each alloy should be combined to create 80 kg of a 53% copper alloy?

*February 27, 2013*

**Spanish**

What's the date of your birthday? B. It's the first of Dec. How old is your mom? A. She's 36.

*February 27, 2013*

**Chemistry**

calculate the energy in joules lost when 70.0 grams of water cools from 86.4 celsius to 7.1 celsius

*February 26, 2013*

**Chemistry**

you have 20% sucrose solution. you need to mke 100ml of 15% sucrose solution. which is the correct dilution? A. 85ml of 20% sucrose and 15ml of h2o B. 25ml of 20% sucrose and 75ml of h2o C. 75ml of 20% sucrose and 25ml of h2o D. 15ml of 20% sucrose and 85ml of h2o

*February 25, 2013*

**Chemistry**

It said it is still wrong. It said Which of the two strong bases will produce more OH ions per formula unit?

*February 20, 2013*

**NEED HELP ASAP**

So it would be KOH>Ca(OH)2>NH3>HBrO>HBr?

*February 20, 2013*

**NEED HELP ASAP**

The answer you put is wrong.

*February 20, 2013*

**Chemistry**

Rank these to highest pH to lowest pH: NH3, KOH, Ca(OH)2, HBr, HBrO I put these in the same order for highest pH to lowest but still get it wrong.

*February 20, 2013*

**chemisty**

The density is the mass/volume. You will have to calculate the volume of the block. The volume of a block is the height x width x length. However, before multiplying, be sure to convert the dimensions so they are the same units. For example, convert them to cm.

*February 20, 2013*

**CALCULUS**

The derivative of e^x is e^x. To determine the derivative apply the constant multiple rule

*February 20, 2013*

**Earth Science**

Which geologic principle states that if rock strata are found folded or faulted, the folding or faulting occurred after they were deposited? faunal succession uniformitarianism original horizontality cross-cutting relationships Uniformitarianism does not sound right at all for...

*February 20, 2013*

**Algebra**

-2x-y=-1 how do you put this in slope-intercept form y=mx=b ?

*February 19, 2013*

**Math**

A bag contains 10 yellow, 15 blue and 5 red Marbles. Mark chooses a candy and doesn't replace it in the bag. Find P (neither blue)

*February 14, 2013*

**Math**

A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?

*February 12, 2013*

**Physics**

A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?

*February 12, 2013*

**math**

In the U.S., 4634 million pounds of apples were consumed in 2002. The population of the U.S. in that year was 290 million. 1. a medium apple weighs about 5 ounces. estimate how many apples a family of four would have consumed in one month.

*February 9, 2013*

**science**

convection and radiation

*February 6, 2013*

**Chemistry**

Kc=0.0406

*February 5, 2013*

**NEED HELP!**

So part a would be at equilibrium and part b would be goes to the left?

*February 5, 2013*

**Chemistry**

In which direction will the net reaction proceed X(g)+Y(g)<---->Z(g) Kp=1.00 at 300k for each of these sets of initial conditions? a) [X]=[Y]=[Z]=1.0 m net reaction goes to the left net reaction goes to the right reaction is at equilibrium I chose 3 for a. b) Px=Pz=1.0 ...

*February 5, 2013*

**Chemistry**

Some people should not be allowed to help others with chemistry...solids do not have concentrations...therefore doubling the volume would have no effect

*February 5, 2013*

**Chemistry**

Kc = 1.2^2/3.8=0.379 The container volume is doubled A(s)<------>B(g)+C(g) (3.8/2)-----x----x--- 0.379 = (x^2)/(1.9 - x) x^2 + 0.379x - 0.7201 = 0 x=0.679 M A = 1.9 - 0.679 = 1.22 M But I got it wrong.

*February 5, 2013*

**NEED HELP!**

•NEED HELP ASAP - Anon, Tuesday, February 5, 2013 at 11:14pm How do I find x and the moles? •NEED HELP! - Anon, Tuesday, February 5, 2013 at 11:25pm Is x=0.189? I used the quadratic equation to solve for x from Kc = 0.514 = (0.6+x)(0.6+x)/(1.4-x). How do you find the...

*February 5, 2013*

**Chemistry**

4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...

*February 5, 2013*

**Chemistry**

2.422 mols is wrong.

*February 5, 2013*

**NEED HELP ASAP!**

Kc = 1.2^2/3.8=0.379 The container volume is doubled A(s)<------>B(g)+C(g) (3.8/2)-----x----x--- 0.379 = (x^2)/(1.9 - x) x^2 + 0.379x - 0.7201 = 0 x=0.679 M A = 1.9 - 0.679 = 1.22 M But I got it wrong.

*February 5, 2013*

**NEED HELP**

I got it wrong. X doesn't equal .189. I really need help on solving this problem.

*February 5, 2013*

**NEED HELP!**

Is x=0.189? I used the quadratic equation to solve for x from Kc = 0.514 = (0.6+x)(0.6+x)/(1.4-x). How do you find the moles of A?

*February 5, 2013*

**NEED HELP ASAP**

How do I find x and the moles?

*February 5, 2013*

**Chemistry Help**

For the first Kc I got .514 For the second Kc I got .129. How do I find the mols afterwards?

*February 5, 2013*

**Chemistry**

4.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.20 M, where it remained constant. A(s) <-------> B(g)+C(g) Then, the container volume was doubled and ...

*February 5, 2013*

**Chemistry HELP**

It is wrong. It said Incorrect. You need to compare Qc to Kc, not Kp.

*February 5, 2013*

**Grammar (Last one :) )**

Thank you :)

*February 5, 2013*

**Grammar (Last one :) ) **

Except for Ronnie and _____, everyone was on time. him(my answer) he Between you and _____, I know the answer to the mystery. I me(my answer) Leave your message with Ms. Horioka and _____. me(my answer) I It was Geraldine Ferraro _______ ran for vice president in 1984. who(my ...

*February 5, 2013*

**English-Grammar**

Thanks :)

*February 5, 2013*

**English-Grammar**

So the third one is "predicate nominative"?

*February 5, 2013*

**English-Grammar**

Decide if the underlined (in parentheses) pronoun in the sentences below is used as a subject, a predicate nominative, or an appositive. Both Ben and (he) will graduate at the same time. (my answer)subject predicate nominative appositive The driver of that station was (she). ...

*February 5, 2013*

**English-Grammar**

Thank you :)

*February 5, 2013*

**English-Grammar **

Identify how the underlined pronoun in each sentence is being used. 18. Someone sent Ed and (me) a text from an unknown phone. direct object (my answer)indirect object 19. Mr. Simons saw Owen and (us) at the registry. (my answer)direct object indirect object 20. Show Edie and...

*February 5, 2013*

**Geography**

What is absolute location? A.a precise measure of where a location falls in terms of longitude and latitude using units such as minutes and seconds B.a precise measure of distance around the equator C.a more precise measure of where a location falls in terms of longitude and ...

*February 4, 2013*

**physics**

ive been sick so i missed a few classes and im not sure whats going on in my class these are my homework problems im trying to keep up

*February 4, 2013*

**physics**

In a water pistol, a piston drives water through a larger tube of radius 1.00 cm into a smaller tube of radius 1.00 mm. (a) If the pistol is fired horizontally at a height of 1.5m, use ballistics (2-D projectile motion) to determine the time it takes water to travel from the ...

*February 4, 2013*

**physics**

The British Sovereign coin is an alloy of gold and copper having a total mass of 7.988 g and is 22-karat gold. (a) Find the mass of gold in kg using that # of karats = 24 x (mass of gold)/(total mass). (b) Calculate the volumes of gold and copper used to manufacture the coin...

*February 4, 2013*

**English**

Thanks :)

*February 1, 2013*

**English**

Which word correctly completes the sentence? To (blank) did you write the card? A. Who B. Whom I thnk the answer is B. Whom. Which meaning of the vocabulary word steep is used in the sentence below? The steep rise in gas prices angered the population. A. Vertical B. Sudden C. ...

*February 1, 2013*

**physics**

A light bulb is placed 17.1 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 6.60 cm closer to the mirror. Calculate the focal length of the concave mirror.

*January 31, 2013*

**S.S**

BonjoviRocker isn't being mean at all. Hes just telling him to just use his own knowledge and think a little harder next time. that's all hes saying lmao

*January 30, 2013*

**Chemistry**

At –11.0 °C (a common temperature for household freezers), what is the maximum mass of aspartame (C14H18N2O5) you can add to 1.50 kg of pure water and still have the solution freeze? Assume that aspartame is a molecular solid and does not ionize when it dissolves in ...

*January 29, 2013*

**NEED HELP!**

Can someone help me?

*January 29, 2013*

**Chemistry**

Classify these mixtures as colloids, suspensions, or true solutions. fog, milk of magnesia, mayonnaise, blood, table salt in water, dust-free air I got fog, milk of magnesia, mayonnaise for colloids. Blood for suspensions. Table salt in water and dust-free air for true ...

*January 29, 2013*

**Chemistry**

Is the freezing point 372 degree C? Kb = 0.512 Kf = 1.86

*January 29, 2013*

**Chemistry**

The boiling point of an aqueous solution is 102.48 °C. What is the freezing point? I know that formula for freezing point is delta Tf = Kf*m but what do I plug in for each?

*January 29, 2013*

**Chemistry**

If M = 0.498 do I times that by 475 mL converted to L to find out the mols and then times that answer by 4.65g to find the molar mass?

*January 29, 2013*

**Chemistry**

When 4.65 g of a nonelectrolyte solute is dissolved in 475 mL of water at 27 °C, the resulting solution exerts an osmotic pressure of 931 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the molar mass of the ...

*January 29, 2013*

**Grammar**

Which of the following words does NOT share the same etymology as the vocabulary word symmetry? A.synthesize B.symbol C.symphony D.sympathetic I think the answer is B. symbol. Thanks for the help :)

*January 29, 2013*

**ACCOUNTING (Advance Sales)**

Hi: I am unsure of how to adjust Advance Sales. For Year End, DEC 31, 2011. If my Unadjusted Balance for advance sales is $324,000 and I am told the following: 75% of the balance in Advance Sales is for garments to be made and delivered in 2012; the remaining 25% is from sales...

*January 27, 2013*

**Geography**

It was right :)

*January 25, 2013*

**Geography**

Thanks :)

*January 25, 2013*

**Geography**

So I should make "all of the above" the answer?

*January 25, 2013*

**Geography**

So, they are all the right answer? I know any of these maps could be used to describe a city, but I don't know if they are all the answer. Wish the question was regular multple choice...

*January 25, 2013*

**Geography**

What kind of map could you use to show information about a city? -a relief map -a population density map -a political boundary map -a vegitation map -All of the above You can pick as many as you want, but the question is only worth one point. I think the answers are political ...

*January 25, 2013*

**English-Grammar**

Thanks :)

*January 24, 2013*

**English-Grammar **

Decide if the underlined pronoun (I put what was underlined in parentheses) in the sentences below is being used as a subject, a predicate nominative, or an appositive. (He) and Bev are using the new computer. subject (my answer)predicate nominative appositive The dancers on ...

*January 24, 2013*

**Chemistry**

You need to dissolve CaCl2 in water to make a mixture that is 31.5% calcium chloride by mass. If the total mass of the mixture is 254.6 g, what masses of CaCl2 and water should be used?

*January 23, 2013*

**Chemistry**

Sort each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. Each phrase specifies the gas involved and the change in its environment. 1. The temperature is increased 2.the partial pressure of an anesthetic ...

*January 23, 2013*

**Physics**

When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?

*January 15, 2013*

**PHYSICS**

When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?

*January 15, 2013*

**Physics**

When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?

*January 15, 2013*

**physics**

T=(f)(d) torque=force x distance T=40NM D=30cm=0.3m F=? T=(f)(d)...F=T/D F=40NM/0.3m =133.3N

*January 15, 2013*

**AP Calc **

For the function find the derivative of its inverse given a point on the original function: y = 3x+1 point (0,11) What am i supposed to do with the point?

*January 15, 2013*

**AP Chem**

Be and B are the huge ones on breaking the octet rule. But, for that question they gave BeH2 so, I guess reasoning is that they are the exceptions? It's multiple choice. but I still want to understand it.

*January 13, 2013*

**AP Chem**

Is it because it only has four electrons to begin with with only two valence electrons? There's no way it can possible even make an octet?

*January 13, 2013*

**AP Chem**

A valid Lewis structure of __________ cannot be drawn without violating the octet rule. Answer: BeH2 Why would BeH2 break the octet?

*January 13, 2013*

**AP Chemistry**

Thank you sir.

*January 13, 2013*

**AP Chemistry **

The Lewis structure of PF3 shows that the central phosphorus atom has __________ nonbonding and __________ bonding electron pairs. Is the answer 1, 3 Is it 1 because it asked for PAIRS- so there are two electrons not bonded- so one pair?

*January 13, 2013*

**chemistry**

1.4169*10^16

*January 13, 2013*

**chemistry**

They are BOTH wrong.

*January 12, 2013*

**Math**

Kamman VanMarko Plumbing equipment sales Commission rate: 9 1/2% Annual base salary: $17,496 Month's sales: $2,460 What is the monthly pay?

*January 11, 2013*

**Differential Equation**

is it from 0 to 21? or 0 to 4.7??

*January 5, 2013*

**Differential Equation**

for 0<=t<=21 the rate of change of the number of black flies on a coastal island at time t days is modeled by R(t)=3sqrt(t)cos(t/3) flies per day. There are 500 flies on the island at the time t=0. To the nearest whole #, what is the max # of flies for 0<=t<=21? ...

*January 5, 2013*

**calculus**

wait...dont u have to integrate it from 0 to 21 or something?? n how would you integrate this equation?

*January 5, 2013*

**calculus**

for 0<=t<=21 the rate of change of the number of black flies on a coastal island at time t days is modeled by R(t)=3sqrt(t)cos(t/3) flies per day. There are 500 flies on the island at the time t=0. To the nearest whole #, what is the max # of flies for 0<=t<=21?

*January 5, 2013*

**calculus**

wait..so how would you integrate that equation..im hving trouble with tht..

*January 4, 2013*

**calculus**

wait..dont u hve to integrate it?

*January 4, 2013*

**calculus**

for 0<=t<=21 the rate of change of the number of blakc flies on a coastal island at time t days is modeled by R(t)=3sqrt(t)cos(t/3) flies per day. There are 500 flies on the island at the time t=0. To the nearest whole #, what is the max # of flies for 0<=t<=21?

*January 4, 2013*

**calculus**

A. The cost of the timber lost = 1000 h The cost to have x firemen is x(25 h +20) The time to stop the fire is t= 3600/x C= 1000 h + x(25h + 20) B. Set h = t H = 3600/x C. Substitute for x in cost equation C= 1000 h + x(25h + 20) = 1000*3600/x + x(25*3600/x +20) = 3.6*10^6/x...

*January 4, 2013*

**calculus**

a) C=1000h+20x+25xh b) h=3600/x c) C=1000(3600/x)+20x+25x(3600/x) C=3600000/x+20x+90000 dc/dx=-3600000x^-2+20 -3600000x^-2+20=0 3600000x^-2=20 20x^2=3600000 x^2=180000 x=180000^1/2 (approx. 424.26) to justify it do d2c/dx^2 d2y/dx^2=7200000x^-3 sub in your answer 7200000*(...

*January 4, 2013*

**calculus**

Ok. Just do it the brute-force way. Initially, the area is 1/2 x 5 x 10 = 25 After one minute, the area is 1/2 x 6 x 7.5 = 22.5 After two minutes, the area is 1/2 x 7 x 5 = 17.5 You can see that the area is decreasing. In terms of derivatives, the rate of change is exactly ...

*January 4, 2013*