Friday

August 1, 2014

August 1, 2014

Total # Posts: 1,679

**chemistry**

Calculate the molarity of a solution that is prepared by dissolving 23.35g of CaCl2 in a sufficient amount of water to make a 600 mL solution.

**chemistry**

Assuming the volume of the connecting tubes is negligible, what will be the pressure in the apparatus after all of the stopcocks are opened and the gases are allowed to mix?

**chemistry**

There is an apparatus that consistsw of three glass bulbs connected by small glass tubes with the stopcocks closed. Given that the temp. is 27 degrees C, what is the pressure of a gas in each glass bulb? 1L=1.79g CO2 2L=0.162g H2 3L=4.87g Ar

**CHEMISTRY HELP**

IF ANYONE CAN HELP ME WITH MY HOMEWORK AND EXPLAIN EXACTLY HOW TO GET THE ANSWERSSS PLEASEEE HELP

**chemistry**

SEE NOW THAT MAKES MORE SENSE..IS THERE ANY WAY YOU CAN DO THAT WITH THE REST OF MY QUESTIONS. IT GIVES A PERFECT DETAIL FOR ME.

**chemistry**

this is all so confusing

**chemistry**

If it requires 54.7mL of a 0.0765 M HCl solution to complete neutralize 25.0 mL of a KOH solution, what is the molarity of the KOH solution.?

**chemistry**

is it-417649 or -.667

**chemistry**

all i did was since the pkw is 14..i just subtracted that from the 9.35 to give me 4.65

**chemistry**

oh..i didn't convert 9.35 into anything though..cause thats the number they gave me

**chemistry**

this is a hard one for me...what do i do with 4.65

**chemistry**

i don't get the OH^-

**chemistry**

ok since 14-9.35=4.65 what do i do after this...

**chemistry**

a pH meter gives a readout of 9.35 when the probe is dipped into an aqueous solution containing the strong base NaOH. What is the molarity of this solution with the respect to sodium hydroxide?

**chemistry**

perfect! 4.79

**chemistry**

hmm i know its 5 something

**chemistry**

so is this what it should look like pOH=-log(7.5x10-10)=9.124

**chemistry**

i understand your trying to help me..but i don't understanf anything that you have helped me.im a step by step person. thats why i thought this would work

**chemistry**

im struggling in this class, and i need as much help as possible.

**chemistry**

you have to explain these better, i dont even understand them

**chemistry**

what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?

**chemistry**

so am i just going like this?...... -log(0.00378)=2.422??

**chemistry**

can we go over this one?

**chemistry**

how do i do this one

**chemistry**

predict the pH of an aqueous solution that is 0.00378 molar in HBr

**chemistry**

ok so to find it...do i subtract them..or divide?

**chemistry**

9.00x?mL=810 how do i find the missing number

**chemistry**

9.00 x 450x 1.80?

**chemistry**

so is just 9.00x 450x1.80??

**chemistry**

so which ones do i times together?

**chemistry**

Calculate the volume of a 9.00 M HNO3 stock solution that must be used to prepare 450 mL 0f a 1.80 M HNO3 solution.

**chemistry**

Calculate the molarity of a solution that is prepared by dissolving 23.35g of CaCl2 in a sufficient amount of water to make a 600 mL solution

**chemistry**

which is 208.8

**chemistry**

well if you times them its 500000..

**chemistry**

so i times them??

**chemistry**

so how do you do this one..i get it a little bit

**chemistry**

a 36.o% Aqueous solution of sucrose has a density of 1.16g/mL.What mass of sucrose is in 500mL of this solution?

**chemistry**

ok so 170/298=P2/333 which is .570...how do i find P2

**chemistry**

ok so 170/298=P2/333 which is .570...how do i find P2

**chemistry**

okay so does it kinda look like this (170)/298/333...i kinda understand not really

**chemistry**

i dont understand this at alll

**chemistry**

A scuba tank is filled to 2500 psi(170 atm) in a dive shop at room temp/(25 degrees C) then stored in the trunk of a car on a hot day. What will be the new pressure in the tank if the temp. in the trunk reaches 60 degrees C? Express that pressure in atmospheres, not psi.

**Physics**

For incomplete cancellation to occur, opposite pulses must have equal amplitudes different energies equal pulses equal displacements it seems like none of these are quite right but would different energies be the closest.

**English**

thank you

**English**

1a. Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved? 1b. Did you know a famous animal-rights activist have criticized horseracing because of the dangers involved? my answer is A. could you please explain it to me?

**Advanced Chem**

Thank you!!! Yes, it's quite an odd problem. My teacher was attempting to show us something to do with polyprotic acids, but he also neglected to tell us that solving for y was a waste of time because its negligible. I was just confused because there's no conjugate bas...

**ALGEBRA**

NEVERMIND, I used common sense

**ALGEBRA**

Beginning in 1995, three digit area codes could begin with any number except 0 or 1. The middle and last number were not limited. How many area codes became available. I know the answer is 640 but I don't know how to explain that answer.

**ALGEBRA**

A new photocopier can make 72 copies in 2 min. When an older photocopier is working, the two photocopiers can make 72 copies in 1.5 min. How long will it take the older photocopier working alone to make 70 copies?

**Algebra**

How would you set it up? Would it be (72/2) + (72/1.5)= (70/x)? we didn't do examples in class

**Algebra**

A new photocopier can make 72 copies in 2 min. When an older photocopier is working, the two photocopiers can make 72 copies in 1.5 min. How long will it take the older photocopier working alone to make 70 copies?

**ALGEBRA EXTREMELY NEED HELP**

NEVERMIND your somewhat right,yet wrong answer helped me and I got the right answer.

**ALGEBRA EXTREMELY NEED HELP**

I don't think that is the correct answer, according to my book it says the answer is -14. I got the same LCD you did

**ALGEBRA EXTREMELY NEED HELP**

It is and believe it or not I am crying because I have a test tomorrow

**ALGEBRA EXTREMELY NEED HELP**

HOW DO YOU SOLVE (2c/c-4)-2=(4/c+5). WHAT IS THE LCD. HOW DO YOU FIND IT BECAUSE I NEED TO KNOW

**Math**

just curious, but would mole be right

**Math**

What do you get when you cross a porcupine with a gopher?

**ALGEBRA**

I my gosh. I knew how to do that it was just that I was thinking too much into the problem. Thanks a bunch.

**ALGEBRA**

How do you solve 2r^2+2r=0

**ALGEBRA**

That's just it. I don't know how to factor it out because i keep getting 2n^2-n=0

**ALGEBRA**

How do you solve the rational equation: (n/n-2)+(n/n+2)=(n/n^2-4) I know that the LCD of the equation is (n+2)(n-2) because that is what you get when you factor out the n^2-4 in the last part of the question. I thought I did it right until I reached the end where I don't k...

**Algebra 1**

First you need to multiply the first and last digits in the equation (2 and 45). Now you find factors of 90 that will equal 13 when added. Both 18 and 5 go into 90 and when used appropriately, they add to -13. So to write it in its new form it would look like 2x^2-18x+5x-45. N...

**ALGEBRA**

How do you solve the problem: (3/s-1)+1=(12/s^2-1)

**chemistry**

use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with acetic acid How many lite...

**chemistry**

use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with acetic acid How many lite...

**math riddle ALGEBRA WITH PIZZAZZ**

what do you call it when somebody spends 20 years in the 24th row of a theatre ?

**Physics**

A ruler is accurate when the temperature is 25°C. When the temperature drops to -16°C, the ruler shrinks and no longer measures distances accurately. However, the ruler can be made to read correctly if a force of magnitude 1.2 103 N is applied to each end so as to stre...

**Physics**

Find the length of a bridge if it is known that the steel in the roadbed expands by 0.52 m when the temperature changes from +2 to +30°C.

**Algebra**

write in form y=a(x-h)^2+k y=x^2-x-9 (x^2-2x)-9 complete the square (x^2+2x+1-1)-9 (x^2+2x+1)-1-9 (x+1)^2-9

**Spanish 3**

Thanks, that is very helpful. In the second sentence I was trying to say to stop being; is that incorrect?

**Spanish 3**

Would someone be willing to edit this paragraph? It's part of a three page paper that is supposed to be a new chapter in Don Quixote. I don't really know when to use imperfect and when to use the preterite, or how to phrase things in Spanish. Después de Don Quix...

**Science**

When did our Earth form to a planet? =]

**Social Studies**

Where did Chinese people get their writing from?

**geometry**

the lenght of pq radius is 2 and the angle measure is 72

**word unscramble in french**

can somebody unscramble the words rinétede? or ropterég? or miénocoser? i really need to know!! and ASAP

**word unscramble in french**

can somebody unscramble the words rinétede? or ropterég? or miénocoser? i really need to know!! and ASAP

**geometry**

A parallelogram has the area of a 507 square centimeters, and its height is 3 times its base. What are the base and height?

**english (books)**

need to know where to find the book the wreck of the zanzibar by micheal morpurgo

**Math**

I have no idea how you would do this problem: Express this expression as a rational number in lowest terms. (1000!-999!-998!)/(1000!+999!+998!)

**Chemistry**

Use the equation below to answer the following questions. Al + H2SO4 ==> Al2(SO4)3 + H2 A. If 8.15 moles of aluminum are reacted, how many moles of hydrogen will be produced? B. If 44.7 g of hydrogen sulfate is reacted, what mass of aluminum sulfate is produced? C. If 34.6 ...

**trigonometry**

Hello! I was wondering if someone could check my answer and tell me if I'm on the right track: "Find a model for simple harmonic motion satisfying the specified conditions" Displacement(t=0), 2ft Amplitude, 2ft Period, 10 sec This is what I got: y=2cos pi/5 t I ...

**algebra**

what were the headlines after a mad scientist trained two eggs to attack a candy store with sharp sticks?

**Science**

How do speakers work I am in 8th grade and have to write a 5 pargaph essay

**Science**

Please give me general information(such as their uses,etc) on 1.Flowers 2.Photosynthesis 3.Food chain 4.Animals 5.Leaves

**Science**

Please give me general information(such as their uses,etc) on 1.Flowers 2.Photosynthesis 3.Food chain 4.Animals 5.Leaves

**algebraic reasoning**

Josephine likes to go hang gliding. she took off from a hillside at an elevation of 700 feet. during the first 5 minutes, she went down to 500 feet. then she rode for another 5 mintues up to a height of 600 feet. she then descended at a rate of 200 feet every 15 minutes until ...

**physics**

Find the speed at which Superman (mass=89.0 kg) must fly into a train (mass = 19564 kg) traveling at 65.0 km/hr to stop it. The system (train + Superman) must end up with zero momentum. With no external forces, Superman's initial momentum must be equal and oppositely direc...

**Chemistry**

The theoritical yeild of a reaction that gives off nitrogen trifluoride gas is 844 mL at STP. What total volume of NF3 plus water vapor will be collected over water at 25° C and a total pressure of 1.017 atm?

**Chemistry**

An air thermometer can be constructed by using a glass bubble attached to a piece of small-diamter glass tubing. The tubing contains a small amount of colored water that rises when the temperature increases and the trapped air expands. You want a 0.20 cm3 change in volume to e...

**biochemistry with more info that was needed**

I have the same lab. It says to use pH's of 4, 7, and 10 in the materials.

**are you POSITIVE?**

you could try to look on dictionary website if you dont believe me

**pronunciation help please**

Coh vay

**Geometry**

i guess

**Geometry**

how do you find the slope when given an equation ?

**Science**

so we can find them eassier..dont you think it would be kinda hard if sombody asked you to find the one lake in Africa or something?just think about.

**Science**

samme reason

**Science**

umm so we can find them easier

**science**

is bigger always more

**PLEASE HELP ASAP..thanks..BIOLOGY**

Where in the cell does DNA become RNA? Which larger a chromosome or a nucleotide. Which is larger, a chromosome or a nucleus?

**science**

that doesnt awnser the question at all

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