Cliff

Most popular questions and responses by Cliff
  1. 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)

    asked on June 14, 2011
  2. 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.

    asked on September 17, 2010
  3. 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.

    asked on December 4, 2015
  4. 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

    asked on November 3, 2010
  5. 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

    asked on October 30, 2010
  6. physics

    A boater wants to head straight across a river that has a current of 3 km/hr. If the top speed of the boat in still water is 4 km/hr. 1.find the direction the boat must travel into the current to go straight across the river? 2. How fast is the boat going

    asked on October 9, 2016
  7. 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.

    asked on April 23, 2010
  8. 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

    asked on December 8, 2010
  9. 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?

    asked on November 24, 2010
  10. 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

    asked on November 23, 2010
  11. 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?

    asked on December 14, 2010
  12. 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

    asked on December 10, 2010
  13. 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

    asked on November 2, 2010
  14. 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

    asked on July 21, 2010
  15. 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

    asked on December 13, 2010
  16. Chemistry

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

    asked on October 20, 2010
  17. 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=

    asked on April 4, 2013
  18. 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:

    asked on November 23, 2010
  19. 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

    asked on November 16, 2010
  20. 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.

    asked on October 24, 2011
  21. 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".

    asked on October 23, 2011
  22. 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?

    asked on November 21, 2010
  23. 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^-) =

    asked on December 12, 2010
  24. 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

    asked on December 11, 2010
  25. 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)

    asked on November 3, 2010
  26. math

    Saying that 4

    asked on July 26, 2010
  27. 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

    asked on May 12, 2010
  28. us history

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

    asked on April 17, 2010
  29. maths

    the first term of an arithmetic progression is-4 and 15th term is double the 5th term. find the 12th term.

    asked on August 17, 2018
  30. 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?

    asked on October 18, 2011
  31. math

    the sum of the first 8 terms of an Approval ia 12 and the the sum of the first 16 term is 56.find the first 3 terms3 of the Ap

    asked on August 17, 2018
  32. 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

    asked on February 5, 2012
  33. 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-

    asked on April 6, 2011
  34. 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?

    asked on June 10, 2010
  35. us history

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

    asked on April 17, 2010
  36. Algebra 1

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

    asked on August 29, 2007
  37. Maths - Linear Relations Simple Problem

    Find the values of m for which the line with equation y=mx+2 does not intersect the parabola with equation y=(x-1)^2 + 5. I am not sure how to solve this problem. I know that both equations equal each other when it intersects but what happens if they don't

    asked on December 22, 2016
  38. 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

    asked on February 8, 2013
  39. chem.

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

    asked on July 30, 2012
  40. 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.

    asked on June 3, 2010
  41. English

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

    asked on April 25, 2010
  42. ACC220

    select a management !@#$%^&tion (planning, directing and motivating,or controlling)and explain how that function relates to business as a whole.

    asked on October 7, 2008
  43. us history

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

    asked on April 17, 2010
  44. 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?

    asked on April 17, 2010
  45. us history

    what was the first big business in american history?

    asked on April 17, 2010
  1. 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.

    posted on December 7, 2013
  2. SPANISH PLEAASSEE HELPP (im stuck)!!!!!!!!!!!!!!!!

    the last answer is ellos, not este.

    posted on February 1, 2012
  3. 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.

    posted on December 14, 2010
  4. 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

    posted on November 24, 2010
  5. 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

    posted on November 17, 2010
  6. Chemistry

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

    posted on November 16, 2010
  7. 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.

    posted on November 16, 2010
  8. 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

    posted on November 16, 2010
  9. Math

    white a ratio the number 21% - 24%

    posted on November 8, 2010
  10. us history

    but thanks

    posted on April 17, 2010
  11. us history

    tyyyy

    posted on April 17, 2010
  12. us history

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

    posted on April 17, 2010
  13. pre algebra

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

    posted on October 27, 2009
  14. 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

    posted on October 27, 2009
  15. 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

    posted on October 8, 2009