Wednesday

September 28, 2016
Total # Posts: 57

**chemistry**

what is the molar solubility of Fe(OH)3 in a buffered solution with pH=8.2 at 25 degrees Celsius given ksp =4.0*10^-38.

*December 4, 2015*

**English**

what is the subject and what is the predicate, of the following sentence. The driver of the pickup truck backed into my car and then sped away.

*December 3, 2013*

**Calculus**

please help!!!!Apply newtons method to approximate the x-values of the indicated points of intersection of the 2 graphs. continue the process until 2 successive approximations differ by less than 0.001. (Hint: Let h(x)=f(x)-g(x)) f(x)=x^6 g(x)=cos(x) x= ??? (smaller value) x...

*April 4, 2013*

**Fractions**

A sales representative earns 4 times as much in the the 4th week of January as in each of the other 3 weeks. What part of his income was earned in the 4th week

*February 8, 2013*

**chem.**

what is the % v/v when 105 mL of alcohol are dissolved in enough water to give a 700 mL solution?

*July 30, 2012*

**c++programming**

I need to know how to write the c++ instruction for Square Root.

*April 10, 2012*

**math**

john types 20 pages in 40 min, sue types 20 pages in 30 min, bob types 20 pages in 24 min. working togehter how long to type 20 paqes

*February 5, 2012*

**math**

To save for a child's education,the petersen's deposited $2500 into an account that pays 6% annual interest compounded daily. Find the amount of interest earned on this account over a 20-year period.

*October 24, 2011*

**math**

Good day to you. How can I approach this math problem. "To save for a child's education, the Petersens deposited $2500 into an account that pays 6% annual interest compounded daily. Find the amount of interest earned on this account over a 20-year period". I try ...

*October 23, 2011*

**physics**

A piece of modeling clay is motionless in space. Another piece of clay that is 4 times as massive moving at 10m/s collides with it and sticks to it. What is the momentum of the combined blob after the collision?

*October 18, 2011*

**SPANISH PLEAASSEE HELPP (im stuck)!!!!!!!!!!!!!!!!**

the last answer is ellos, not este.

*September 15, 2011*

**chemistry**

How many grams of HCl must be used to produce 10.0L of chlorine gas at STP? Reaction: 2HCl (g)--->H2 (g)+Cl2 (g)

*June 14, 2011*

**biology**

Hi, I appreciate your expert help,and I have a question for you. If I'm asked to decribe resting potential, action poential, and synaptic transmission,in point form;would the following responses be right? Resting Potential: 1.Membrane at resting potential- negative on the ...

*April 6, 2011*

**Chemistry**

Glycine is an amino acid that can be abbreviated HGly. If 27.50mL of 0.120 M NaOH neutralizes 0.248 g of HGly,what is the molar mass of the amino acid?

*December 14, 2010*

**Chemistry**

I submitted an incorrect answer to that problem. The correct answer is 0.000 000 000 28 M. I apolgise. I've been sleep deprived.

*December 13, 2010*

**Chemistry**

Hi, I'm trying to solve some chemistry problems, like the ones my teacher says will appear on our exams. The problem reads like this: What is the hydrogen conentration in a bleach sample that register 9.55 using a pH meter? My Attempt: Since this sample register a 9.55 on ...

*December 13, 2010*

**chemistry**

Hi ! Could you please help me to see through this problem. *I know it's asking me to find the hydrogen ion concentration in a bleach sample. *If the pH meter reads 9.55..this suggest to me this is a base. Maybe,I can use the equation: pOH = -log (OH^-) = -log (9.55) = 0....

*December 12, 2010*

**chemistry**

Hi, I've watched a tutor solve a simple dilution solutions problem on video. There's a calculation in that problem I wish you could clarify for me. It goes like this: Approximately what volume of water is needed to dilute 25.0 mL of 18.0 M sulfuric acid to 3.0 M ? M * ...

*December 11, 2010*

**Chemistry**

Hi,may I have your help? I have posted a titration question that I'm trying to solve. The correct answer to the problem is 0.128 M, however,I have arrived at the answer: 0.000128 M. Here's the question: If 38.30 mL of 0.250 M NaOH is used to titrate 25.0 mL of ...

*December 10, 2010*

**Chemistry**

Hi,can I have your help? I'm just trying to solve a few Dilution Solution problems. I'm stuck on these two,and I wish you could help. Here's one: A 500 mL bottle of concentrated acetic acid is diluted to make a 5.0% solution. Find the volume of diluted that is ...

*December 8, 2010*

**Chemistry**

You have been really helpful..may I have your suggestion.. as to the approach to solving these 3 chemistry questions please.I'm new to the topic area:PARTIAL PRESSURES 1.A gas mixture consists of 6.91g of N2 gas,4.71g of O2 gas and 2.95g of He.What volume does the mixture ...

*November 24, 2010*

**Chemistry**

Please let me know how I'm doing with the following chemistry problems. I appreciate your imput. Here's problem 1: A sample of Helium gas occupies a volume of 29.4mL AT 18deg.celcius. (a)Would the volume of this gas sample be doubled at 36deg.celcius? (b)At what ...

*November 24, 2010*

**Chemistry**

Tutors: thanks for your help. Is this how this problem is solved ? A sample of Xenon gas at 20degrees celcius and 0.570atm is cooled to a pressure of 0.100atm. If the volume remains constant what is the final temperature in degree celcius? Solution: Using Gay-Lussac's Law ...

*November 23, 2010*

**Chemistry**

Please let me know how I am doing with the following three chemistry questions. 1.A sample of a gas in thermometer has a volume of 135mL at 11 degree celcius.Indicat what temperature(in k and degree celcius)would correspond to the foll.volume: (a)volume:113mL temperature ?? ...

*November 23, 2010*

**Chemistry**

Please let me know how you would approach the gas law problem. Here goes: If the pressure exerted on the gas in a weather ballon decreases from 1.01 atm to 0.562 atm as it rises. By what factor will the volume of the gas in the ballon increase as it rises? I can't seem to ...

*November 21, 2010*

**Chemistry**

"I this problem has serious problems of it own" lol That comment was great..made me laugh. The question was taken from my chemistry text's supplementary online students resource. I did email that question to my teacher afterwardds..she taught it was a strange ...

*November 16, 2010*

**Chemistry**

Incidentally the answer to that chemistry question is suppose to be 5.4L, if that's of any help

*November 16, 2010*

**Chemistry**

I'm sorry I don't have an answer for your question..as to what units are involved. In trying to solve,I asked myself the same question. I wrote the question verbatum.

*November 16, 2010*

**Chemistry**

This gas has undergone 'an increase in temperature under constant pressure'; yet a value has not beeen provided. Please define this for me. Thanks again

*November 16, 2010*

**Chemistry**

I just have a quick question for you. Do I use Charles' Law to solve the following problem, if not, how should I approach this? If a 5.0 sample of a gas undergoes an increase in temperature under constant pressure,what is a possible new volume? Thanks for your help.

*November 16, 2010*

**Chemistry**

Thank you for being helpful in the past. Could you check my interpretation of the three chemical word problems below,and,let me know if I'm on the right track? 1.Determine the mass of water vapor formed when 1.00g of Butane (C4H10)is burned in a lighter(combined with ...

*November 3, 2010*

**Chemistry**

Thank you for being helpful in the check my interpretation of the three word problems below,and,let me know if I'm on the right track? Determine the mass of water vapor formed when 1.00g of Butane (C4H10)

*November 3, 2010*

**Chemistry**

Please help me solve this problem. I don't know how to approach this problem type. C3H8(g) + 5 O2 (g) ---- 3 CO2(g) + 4H2O(g) Conside the reaction. If you start with 7.0 moles of C3H8 (propane)and 7.0 moles O2, ________ mole(s) of carbon dioxide will be produced. Thanks ...

*November 2, 2010*

**chemistry**

Please let me know if my equation is correct,taken from the following word problem. If you react Iron(111)oxide with carbon monoxide,you will produce liquid iron and carbon dioxide. Fe2O3 + CO --> Fe + CO2. If I'm correct..how do I balance this. Thanks for your help.

*October 30, 2010*

**Chemistry**

If 1.00 L of an unknown gas at STP has a mass of 5.40 g,what is the molar mass?

*October 20, 2010*

**Intro. Chemistry**

Based on the law of definite composition, Dalton proposed that one atom of carbon combines with two atoms of oxygen to always produce CO2. Similarly,he proposed that two atoms of hydrogen combine with one atom of oxygen to give a molecule of H2O. Finally,Dalton reasons that ...

*September 17, 2010*

**math**

Saying that 4<(sq.root of x)<9 is equivalent to saying what about x ? a. 0<x<5 b. 0<x<65 c. 2<x<3 d. 4<x<9 e. 16<x<81 Please help. Does this problem relate to 'x'values on the xy coordinate system ? If so please explain the concept ...

*July 26, 2010*

**Math**

On a math test,12 students earned an A. This number is exactly 25% of the total number of students in the class. How many students are in the class? 'In this problem I'm not sure whether I'm being asked to solve for one or two unknowns. May I have your help ? ...

*July 21, 2010*

**trig**

the scores on a 100 pt test are normally distributed with a mean of 80 and a standard deviation of 6. a student's score places him between the 69th and 70th percentile. what is his score?

*June 10, 2010*

**Math**

May I have your help in solving this type of function ? y = square root of x+1 I get a little confused when a radical is present in the function.

*June 3, 2010*

**math**

What is the line of thought or sequence of thought for solving simple algebraic expressions? When I'm asked to solve the expression (5k)k^3....first I check with my list of exponent rules, and there are always a few that could be used to solve the expression.I just dont ...

*May 12, 2010*

**English **

Please define what is meant by "general to specific logic." Thank you

*April 25, 2010*

**chemistry**

How would you find the number of 'chalk molecules' it takes to write your name on the board? Explain what you would need to do,and provide a sample calculation.

*April 23, 2010*

**us history**

identify the six groups or individuals fredrick jackson turner ommitted from his thesis regarding the frontier experience in american history....

*April 17, 2010*

**us history**

discuss the applicative meaning of the 18th century theory known then as recapitulation

*April 17, 2010*

**us history**

identify five reasons why european immigrants took flight from europe during the late 19th and early 20th centuries.

*April 17, 2010*

**us history**

but thanks

*April 17, 2010*

**us history**

ummmmm my teacher is kinda strange in his methods and doesnt go by the book really..... he expects us to know

*April 17, 2010*

**us history**

the arid and difficult conditions of the landscape rather than new land laws passed to assist settlers were more important to shaping the emerging institutions of the american west in the later decades of the 19th century true or false?

*April 17, 2010*

**us history**

tyyyy

*April 17, 2010*

**us history**

what was the first big business in american history?

*April 17, 2010*

**pre-algebra**

Divide the total length of 500 yards by the length of each piece (33-1/3 yards). X = 500 / 33-1/3 X = 15

*October 27, 2009*

**pre algebra**

It could be greater than, equal to, or less than; depending on the value of w.

*October 27, 2009*

**5th grade**

This is a problem class known as permutations. There are 4 choices for your first number (i.e, 1,2,3,4)followed by 3 ways to pick the next number since there are only 3 numbers left. This leaves 2 ways to pick the next number and 1 way to pick the remaining number. 4*3*2*1 = 24

*October 6, 2009*

**ACC220**

select a management fuction (planning, directing and motivating,or controlling)and explain how that function relates to business as a whole.

*October 7, 2008*

**Math**

white a ratio the number 21% - 24%

*July 11, 2008*

**Algebra 1**

Graph the function f(x)=-2x+5

*August 29, 2007*

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