# Posts by Kathryn

Total # Posts: 165

**chemistry**

How would set up a problem like this? A mass of 20.0 g of NaOH is dissolved in water to form 5.0 dm^3 of solution. What is the molarity of the hydrogen ion concentration if the temperature is 25 degrees Celsius?

**Chemistry**

"A 25.0% solution of Al2(SO4)3 has a density of 1.75 g/ml. What is the mass of dissolved solute in 40.0 ml of solution?" How would one set this problem up?

**geometry**

that doesnt help

**geometry**

A rectangular box measures exactly 72 cubic feet. What are its possible dimensions? Give 3 answers.

**Chemistry**

How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)? Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.

**north america**

san francisco is a city california a state

**north america**

city

**5th grade**

Friday= 8/10 of a mile ran Wednesday= 1/10 of a mile ran Monday= 6/10 of a mile ran Tuesday= 11/10 of a mile ran

**PLEASE HELP: Chemistry**

How many atoms of element "R" are present in 55.80 g of (AH3)4(R2O3)4 (molar mass = 478.17 g/mol)? Please help. I've tried going (g of molecule/mol)x(1 mol of molecule/ 55.80g)but I'm not really sure what to do with this.

**Chemistry**

Hello, I am looking just for someone to tell me how I go about doing this problem, ie. the formula that i would need to know for it. I would really like to figure it out on my own but I'm not sure how to. The mass ratio of Kr to F in a particular compound is 2.206:1. How ...

**Algebra**

I think it would be 1/12. Each dice has 6 numbers, thus there is a 1/6 probability of rolling any number. When you roll the second dice you have the same probability of getting any number. Since you want the numbers to be the same you would multiple the probabilities of ...

**reimbusment methodology**

Your hospital has just received a reimbursement rejection from the fiscal intermediary for two outpatient procedures that were performed on the same day. This rejection was probably generated by....A. the CCI outpatient code editor B. the internal auditing program C. the HAVEN...

**12th grade**

prove that the statement 1/5+1/5^2+1/5^3 +...+1/5^n=1/4(1-1/5^n) is true for all positive integers n, write your proof in the space below

**Physics**

for imcomplete cancellation to occur, opposite pulses must have?

**Math**

A furniture company displays bedroom sets which require 21 square meters of space and living room sets which require 42 square meters of space. The company, which has 546 square meters of available space, wants to display at lease 6 bedroom sets and atleast 5 living room sets...

**algebra 2**

16 beds * 21 square meters of space = 336 5 living * 42 square meters of space = 210 add those two up and get the total availible space of 546 Draw the graph showing the feasible region.Label the coordinates of the vertices of the feasible region.

**stats**

The probability of receiving a false positive on a mammogram is 7%. If the patient receives 10 mammograms in her lifetime what is the probability that none of the tests come back as a false positive?

**chemistry**

a scientist wants to make a solution of tribasic sodium phosphate ,Na3PO4, for an experiment. how many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na+ ions of 1.30M

**Physics**

I know this is about 5 years too late, but h would be the length of the vine (21 m)

**Physics**

Under the influence of the electric force of attraction, the electron in a hydrogen atom orbits around the proton on a circle of radius 5.3 x 10^-11 m. What is the orbital speed? What is the orbital period?

**Materials Science**

A cube of aluminum contains 10^21 atoms. how long is its edge(in mm)?

**Parent**

Mr Mike plants cabbages in a square grid so that the number of rows and columns are equal. He increased the size of his garden eqully in rows and columns to create a new patch that could grow 211 additional cabbages at the same spacing. How many cabbages did he plant in one ...

**chemistry**

a buffer is prepared by combining 10.0g of NaH2PO4 wiht 150mL of 0.20M NaOH and diluting to 2.0L. What is the pH of the buffer, Ka H2PO4-= 6.2x10-8

**algebra**

im practicing simplifing expressions and have been given (-9a-9)5. should i use disstributing rule if not please explain how i would have to do this problem. thnx

**calculus**

how do you solve the integral of 1/[(square root of x)(lnx)] from 2 to infinity? i did the p- integral theorem with 1/square root of x and got it to be a divergent integral. however i was told this was the wrong way and that i should do it by integration by parts. but i can&#...

**Geography**

In geography I'm doing pollution in antartica but I can't understand half the things on the websites I've looked at Help please!

**Trigonometry**

this is a propf and I need both sides to equal each other. Thanks this one stumped me. sin^3x/(1-cosx) = sinxcosx+sinx

**English Paper**

what is the paper supposed to be on, what are you trying to prove in it?

**vocab**

Notorious: ill-famed: known widely and usually unfavorably hospitable: Hospitality refers to the relationship process between a guest and a host, and it also refers to the act or practice of being hospitable, that is, the reception and entertainment of guests, visitors, or ...

**Chemistry**

I flipped the second equation around to go with Hess's law which gives me a h value of 359.4 for the second one but I am lost after that.

**Chemistry**

I am beyond desperate. I do not understand how to calculate heat change at all and I have been looking online and reading my book for the last three hours. Below is posted a problem. It would be amazing if someone could work through it and explain each step they are doing and ...

**Math**

I am pretty sure that an equation uses an equal sign and an expression does not. Equation: a mathematical statement that two expressions are equal Expression:combination of values, variables, operators, and functions

**Social Studies**

I think it might be silk but I am not too sure.

**Social Studies**

According to Procopius two sixth century Christian monks undertook an elaborate smuggling operation to provide Byzantium with the expertise to produce what? A) steel B) iron C) ceramics D) gun powder E) silk

**Science (?)**

Thank You

**Science (?)**

What are all the ways humans use rivers? I am writing a report on the relationship between water and organisms and I am now talking about the ways we humans use river. So far I have as a source of transportation, recreation (for boating, fishing, and canoeing), and as a source...

**Histories/Social Studies**

What was the dividing line between Former Han and the later Han marked by? ((IN ancient China))

**Ethnic Diversity**

I like that the FBI can investigate people "without evidence". Obviously if they're taking the time to investigate you something about you caught their attention. And anyway, you don't have anything to worry about if you're not up to anything.

**math--I am stumped**

I am stumped please help me with this problem. ---- A man was walking down a path one day when a women appeared in front of it at exactly 8:06 AM. The next day, the man was walking down the same path, and the women appeared in front of it at 6:03 PM. The next day, the same ...

**Math**

Last weekend, I went to play in the nearby park. It was real fun! I rode my new bicycle that Mom had gifted me on my birthday. On reaching the park, I saw that there were a total of 8 bicycles and tricycles. If the total number of wheels was 20, how many tricycles were there?

**US HISTORY**

What effect did racial violence have on President Kennedy's approach to civil rights?

**math**

i don't know how to work these problems out so i'll just pick a random one out from my home work and if someone could explain it to me step by step that would be very helpful. Solve the tragicomic expression for all answers between 0 degrees and 360 degrees 2cos^2x-...

**Math**

Music Encyclopedia: Allegro (It.) Quick; a movement in lively tempo. Dictionary of Dance: allegro allegro (It., merry). General term to describe a quick and lively tempo, it also refers specifically to any combination of fast steps (as opposed to adagio) as well as to the ...

**Science**

How is yeast considered a fungus?

**speech**

i want to do a persuassive speech topic on animals but i was wondering what some of the options i have are. i was also thinking about doing one on exsessive homework, what kind of studies have been done on that?

**International Business**

How would you accomplish exposure netting with currencies to two countries that tend to go up and down together in value?

**Algebra**

draw the graph showing the feasible region. Label the coordinates of the vertices of the feasible region.

**PlEaSe HeLp Me!!!**

Describe in one paraghraph what embryonic and adult stem cells are and how knowing the difference relates to the artice (the article was on stem cells from human skin; no embryos needed). How do i answer that and what are embryonic cella and adult stem cells

**Science**

Describe in one paraghraph what embryonic and adult stem cells are and how knowing the difference relates to the artice (the article was on stem cells from human skin; no embryos needed). How do i answer that and what are embryonic cella and adult stem cells

**Biology**

okay, were supposed to answer the following question, i have the basic idea ( i think) and i was just wondering if someone would read over it and what i put and then help out with what im missing Describe humoral immune response in humans. Include the kind of cells involved ...

**HELP, PLEASE-Science**

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo meiosis. A short while ...

**Science**

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo meiosis. A short while ...

**Biology**

Read the statment and then say which answer is right, why its right and why the others are wrong. I think the answer might be D but I don't know how to explain it or if it is even right. A biologist marked a cell which she knew was about to undergo meiosis. A short while ...

**history**

What do most countries in middle & south America have in common with the U.S.?? How are they different?? i could use some help with this question, plz

**history**

o, well thanks for your help anyway, the worksheet says circle the letter of the best choice. so I'll just re-read the information.

**history**

what are the main influences on central America & the Caribbean countries? a)Aztecs & Mayas b)ecotourism & communism c)the spice trade & shipping d)colonialism & slavery

**pre-alg**

In a pattern, the # of colored tiles used in row x is 3 to the power of x. Find the number of tiles used in rows a, 5, & 6. i don't get this problem & could use a little help, plz!

**social studies**

thank you once again

**social studies**

what is due process as defined by the constitution

**english**

thank you so much

**english**

what does moral censure mean such as when used in the sentence plea bargaining conflicts with moral censure

**words**

rock the boat

**History**

What does John Lennon fear. It's for a Bio Poem http://en.wikipedia.org/wiki/John_Lennon Use Ctrl + F and type in fear and then click on Next. =)

**Writing--Plz Help!!**

I am confused with this question that I have on a homework assignment. When developing a written plan, a technique in which the writer includes every detail as it occurs is called: 1. writing a rough draft 2. outlining 3. brainstorming I am leaning toward brainstorming and ...

**Question**

What needs to be done to correct this sentence? 1.Just what would you do,Cheryl,if the situation were reversed? a.The sentence is correctly punctuated. b.Remove the comma before Cheryl. c.Remove the comma after Cheryl. d.Replace the comma after Cheryl with a semicolon. I would...