# Posts by Lala

Total # Posts: 402

**chemistry**

How can one create an experiment that will deteremine the Ksp of a solid like Ca(OH)2

**Chemistry**

So far i have deltaH= 20g x 4.18 j/g deg C x 80 deg = 6.688KJ AND DELTA H= 1.11mol x 40.8 KJ/Mol = 45.3 kj but i don't know what to do next :(

**Chemistry**

If 55.0 kJ of heat are added to 20.0 g of water at 20oC, what is the final temperature of the system?

**chemistry**

A thimbleful of water at 100 deg C has a higher temp than a swimming pool full of water at 20 deg C, but the pool has more thermal energy than the thimble. Explain why this is possbile?

**Chemistry**

Some polymers are flexible when pulled one way but not another(example:milkbags). Can someone please explain why this happens?

**calculus**

Two roads intersect at an angle of 48º. A car and truck collide at the intersection, and then leave the scene of the accident. The car travels at 100 km h down one road, while the truck goes 80 km h down the other road. Fifteen minutes after the accident, a police ...

**calculus**

Three ships are at points P, Q, and R such that PQ=2km PR=7 km, and <QPR=142. What is the distance between Q and R, to two decimal places.

**Calculus**

A certain radioactive material decays exponetially. The percent, P, of the material left after t years is given by P(t)= 100(1.2)^-t a)Determine the half life of the substance

**Calculus**

How can i find the ln of both sides of the equation? 6=6e^3x and O.2= e^-kt

**Calculus**

How do i find the second derivative of f(x)= tan(1-x)^1/2

**Calculus**

How can i find f''(x) of the function f(x)= 2(cosx)(sec^2x)

**Calculus**

A fence is 1.5m high and is 1m from a wall. A ladder must start from the ground, touch the top of the fence, and rest somewhere on the wall. Calculate the minimun lenght of the ladder. I drew a diagram and i ended up with a right angle triangle. i made the hypotenuse the ...

**physics**

6. If you applied a force of 200N to push a box along the floor at a constant velocity, what is the net force on the box? What is the force of friction on the box?

**physics**

67-3 = 64 x 3.10 = 198

**Calculus**

How can i factor x^3 - 3x^2 + x -4? I tried the factor theorem method, but it doesnt work. Is there another method for factoring cubic equation? Is there a formula that one can use?

**Calculus**

When given only graph of f(x)(no equation), how can one graph f'(x) and f''(x)?

**biology**

a scientist finds no evidence that species in a community are competing and concludes that competition never played a role in the development of this community. is this conclusion valid?

**biology**

in a relationship that is an example of commensalism, would the species that is neither helped nor harmed evolve in response to the other species?

**biology**

in japan, native honeybees have evolved an effective defense strategy against giant Japanese hornets. imported European honeybees, however, are unable to defend themselves. explain this in terms of coevolution?

**Chemistry**

How does the molar mass of molecules affect the boiling points? e.g MOlar masses HI-->127.9 HF--->20.07 HCl---> 36.45 Boling points HI-->-35.55 HF---> 20 HCl--->-114.17 can it be said that except for HF molecule, as molar mass increases the boling points alos...

**Chemistry**

Are the intermolecular forces that are acting ont the molecule HF as follows: dipole-dipole, ionic and hydrogen bond

**Math**

Use synthetic division to divide. (4x3 + 26x2 + 10x - 12) ÷ (x + 6)

**Math**

Divide as indicated. (-2x5 - x3 + 4x2 + 58x - 20) ÷ (x2 - 5)

**Chemistry**

How does the process of chromium electroplating work?

**Chemistry**

How does the process of chromium electroplating work?

**Calculus**

4. Find the dimensions of the largest isosceles triangle having a perimeter of 18 cm. Answer ( all sides 6 cm) i really need help with coming up with the equation of the function before solving its derivative and making it equal zero so far i know 2x+y=18

**French**

Les visiteurs m'appellent un bebe. You made a mistake with the present third person of the verb appeler.

**Calculus**

How do i find the derivative of f(t)= 20- 30/rooot 9 + t^2 heres how i did it f'(x)= 20' - 30/root(9+t^2) ' = 0 - 30/root(9+t^2) ' (Quotient rule) f'(x)= 30' (root(9+t^2) - 30(root(9+t^2) ' f'(x)= -30(0.5(9+t^2)^-0.5) (2t) the answer at the back...

**chemistry**

a galvanic cell: A copper electrode is placed in a Cu(NO3)2 electrolyte. An iron electrode is placed in a Fe(NO3)3 electrolyte. a) What will happen to the voltage if sodium sulfide solution was added to the copper solution(I found that CuS(solid precipitate) will be formed, ...

**chemistry**

Why is it that an electrochemical cell(galvanic cell) cannot operate forever?

**chemistry**

How does the voltage of a galvanic cell change, when there is a precipitate in the solution?

**Chemistry**

TestubeA: KMnO4 + H2S04 + NaHSO3---->MnSO4+ K2SO4+Na2SO4 (colourless solution) a) if test tube a wasn't acidic enough, what colour might you expect in the products.

**CHEMISTRY**

reaction KMnO4+ EDTA(ethylenediaminetetraacetic acid) + MnSO4(s)---> MnCl3 (Violet/Rose solutions) note: Mn is being reduced. a) What is the catalyst in this reaction above? b)What is the role of EDTA in the reaction above

**chemistry**

Testtube B: Has a solution of KMnO4 + NaOH+ NaHSO3----> K2MnO4 (green coloured-solution)+H2O+Na2SO4 If too much HSO3^1- was added to this solution above, what would be the resulting colour and why

**math**

Well all u have to do is to get a calculator and divide 310000 by 9 310000DOLLAR/9PLP= 34444.44DOLLARS PER PERSON. So each person gets $3444.44

**chemistry**

defie le chatelier's principle and the role equilibrium plays in the reduction of stress

**english**

how is the way lady macbeth behaves in private to the way she behaves in public?

**Literature**

I said they symbolized people: sometimes rough on the outside, all beautiful on the inside, and unique.

**Literature**

Hey- I'm doing this question also. I think that what she is is passionate. She feels very strongly. She is also a little bit desperate. Hope this helps! p.s. how do you know she's talking to three children?

**Literature**

they are

**chemistry**

Write the complete balanced molecular, ionic,and net ionic equations for the reaction of nickle II chloride + sodium phosphate. Which product,if any, is a precipitate?

**math**

solve: x^2+2x-3=0

**PERSONAL FINANCE**

a SAVER HAS A $1000 ON DEPOSIT IN AN ACCOUNT EARNING 3 PERCENT INTEREST. dURING THIS YEAR THE INFLATION RATE WAS 5 PERCENT. AFTER ONE YEAR EHAT IS THE BUYING POWER OF THE AMOUNT IN SAVINGS FOR THAT PERSON?

**math-pre al**

your face

**English**

number one isn't right because it is two different tenses. yes, nuber 2 is right.

**careers**

bankers,CEO

**Pigskin Geography**

For numbers 13 and 14 on week 8 I cannot find how much larger houston is than buffalo and how much larger minneapolis is than Green Bay. Please Help!!! Thanks:)

**Ms. Sue please help**

Pigskin week seven interstates help please

**Pigskin Geography**

Does anyone know the interstates for week seven. Ithink its numbers 12-15 or something like that

**Pigskin Geography**

What are the Interstates for pigskin week seven. They are like the last problems and I can't find them anywhere.!!

**Physics**

3 MI/HR

**Math**

False. If x is positive and you put a negative in front of it, you have to divide by negative one which would then give you positive x again. If you multiply a positive x and a positive y then xy is positive. False. Hope that helps.!!!:)

**eng**

who is wulfings in beowulf

**english**

compare and contrast beowulf from batman

**english 3**

throughout the novel of the scarlet letter,what did weeds and poisonous plants symbolize?

**11th grade**

Write your own journal entry from the perspective of a member of Bradford's colony. What do you think of these unruly pirates? What shocks you the most about these surly characters? How do the manners of the pirates differ from yours?

**english**

fetter

**english**

perhaps the atlethes amoung them(relish) the additional exercise but i must (loathsome) the fact we do not have comfortable shuttles from the lot to campus

**english**

it is not exactly an(affliction) but seniors are forced to park quite far from campus. is affliction right

**english**

i already di just help me please!

**english**

can u help with the other two now?

**Catering**

05983900 Gourmet Essentials

**chemistry**

23332

**GR.10 CIVICS!!!!!URGENT**

CAN SOMOENE PLEASE GIVE ME A LINK TO A PICTURE THAT HAS TO DO WITH OR IS RELATED TO ABORIGINALS GAINING THE RIGHT TO VOTE IN CANADA(1960).PLEASE! ITS URGENT.THANKS

**catering**

In the dining room brigade system, the positions of maitre d'hôtel and/or captain may be combined with the title of

**chemistry**

THANK YOUUU!

**chem**

how about barium

**chem**

calculate the number of moles in 0.00655 g of antimony

**Romeo and Juliet Summary**

Could you please read my act 1 summary of Romeo and Juliet and if there are any changes needed please let me know. It doesn't matter if you don't remember the first act but as long as it sounds right to you. Thanks God Bless Sampson, and Gregory who are sevants to ...

**Romeo and Juliet Help (24 hours and no response)**

I posted questions yesterday and it's on the next page. Could you please check them and get back with me thanks.

**Romeo and Juliet (Check answers pplz hurry)**

Could you please check these answers from Act 1 (Review it's only 5 questions) 1.What warning does the Prince issue to the Capulets and Montagues? Answer: The Prince warns to the Capulet's and Montague's is if anyone fights they will be put to death. 2. What ...

**arithmetic**

83.6/4

**Romeo and Juliet**

Could you please help me with this thanks. In act 1 scene 5 Romeo and Juliet say speeches that form a sonnet. Could you give me a link that will give me a translation of what they are saying. Thanks for your time

**math**

a driveway is 162 feet long, 12 feet wide, and 6 inches deep. how may cubic yards of concrete will be required to lay the driveway? and pease explain answer

**math**

a rectangle has perimeter of 120cm a) write the length of the rectalngle as a function of its width

**math**

what is the answer to 4/7 divided by 8/9 my teacher isnt very good at helping me

**pre-algerbra**

what is the simplest form 8/22 16/24,9/21/,20h/24h using product of prime factors.

**4th grade English**

Past tense :)

**science**

Post a 200- to 300-word response to the following: Discuss an environmental problem that you feel is significant in your town or city. What are some causes? Are any of these causes related to human values and environmental ethics? Explain I really need help is there any one ...

**ENVIRONMENTAL SCIENCE**

Thank you so much That website was really helpful.

**ENVIRONMENTAL SCIENCE**

Post your response to the following: Reflect on your own worldview and compare it with the worldviews presented in the text. Provide examples of the benefits of your view to defend your position. Please help!! If you can before thursday 11/6/08

**call of the wild**

A novel differs from a short story because it

**finance**

because normally private placing are targets to the large insitution which are independent of the company,i just want to know whether the ordinary shareholder who bought quite few shares belonging to the third party and whether they are elibile for bid the private placing . ...

**finance**

In a private placings,the shares will be issued to the third party for raising capital of the company.Is the third party include or exclude any publics who bought 1 or 2 shares from secondary market.so is that possible for the ordninary publics like us to bid private placing?

**math riddle ALGEBRA WITH PIZZAZZ**

Did you hear about......

**chem**

Drbob222 is talking about face diagonal not body diagonal

**chemistry lab**

does anyone has the answer to this?

**English**

Number 4.

**Language skills**

A sentence with superfluous. Please help.

**heat**

A siler bar 0.125 meter long is subjected to a temperature change from 200 degrees celsius to 100 degrees celsius what willbe the length of the bar after the temperature change?

**science**

don't know

**Math**

i have no clue

**homework help**

chapters 10-11 1. what brqve things does atticus do in chapter 10? why are jem and scout shocked? 2. what did jem dp when mrs dubose said atticus"lawed for niggers" 3. what did jem learn from his encounter with mrs dubose and folowwing her death? thanx ppl Thank you ...

**science**

lalalalalalalalaalalalala...................

**the big idea of energy**

im doin da bloody ear fingy 2 WAT IS DA BIG IDEA OF ENERGYYYYYYYYY?????? i need 2 no by 2moz heeeeelp!!!!

**science**

because lighter objects orbit heavier ones it is a well known fact of gravity

**Neon**

hippos are cool!!!<3 =)

**social studies**

woops you already have michelangelo

**social studies**

franco , in spain. musullini, in italy

**social studies**

Michel Angelo!