Friday
August 22, 2014

Posts by candy


Total # Posts: 354

Chemistry - pls help
This is a limit test for chlorides. 1.0g of NaOH sample was dissolved in 5ml of deionized water, acidified with 4ml of dilute nitric acid and diluted to 15ml with deionized water. (Test tube A) 10ml of 50ppm Standard NaCl solution was prepared. 5ml of water was added, follwed ...
September 22, 2010

Chemistry - more advice needed thanks
I obtained a lot of dirty brown ppt the moment the mixture was poured into AgNO3 solution. Does this mean my NaOH sample contains a lot of chlorides? Could other silver halides be present? However for my control solution of 50ppm sodium chloride solution,a cloudy white ppt was...
September 21, 2010

Chemistry - bobpursley pls help
Posted by candy on Tuesday, September 21, 2010 at 3:12pm. Yes, my NaOH is granular. Why 7ml of 10M HCl? Do I add 7ml of 10M HCl 1st slowly in ice bath, then slowly adjust the pH to 7 using 10M HCl? Then to dilute to 15ml in a graduated cylinder? Thanks Posted by candy on ...
September 21, 2010

Chemistry - help
I obtained a lot of dirty brown ppt the moment the mixture was poured into AgNO3 solution. Does this mean my NaOH sample contains a lot of chlorides? Could other silver halides be present? However for my control solution of 50ppm sodium chloride solution,a turbid solution (...
September 21, 2010

Chemistry - help
This is a test for chlorides in NaOH sample. 1.0g of NaOH was dissolved in 5ml of distilled water, acidified with 4ml of dilute nitric acid and diluted to 15ml with distilled water. This mixture was poured into a test tube containing 1ml of AgNO3 solution. However, I obtained ...
September 21, 2010

Chemistry - repost
Why 7ml of 10M HCl? Do I add 7ml of 10M HCl 1st slowly in ice bath, then slowly adjust the pH to 7 using 10M HCl? Then to dilute to 15ml in a graduated cylinder? Thanks Posted by candy on Tuesday, September 21, 2010 at 10:03am. The following is part of a procedure for a limit ...
September 21, 2010

Chemistry - urgent
The following is part of a procedure for a limit test for sulphates in an NaOH sample:- Dissolve 3.0g of NaOH in 6ml of deionized water, adjust to pH 7 with HCl (approx.7.5ml) and dilute to 15ml with deionized water. Please explain how to perform this procedure. Conc HCl or 1M...
September 21, 2010

math
how do you write twenty-two millionths? (in standard form using numbers)
September 18, 2010

math
write in standard form using numbers - Two thousand twelve ten-thousandths?
September 18, 2010

English
Oh my gosh! I wrote as anonymous because I was kinda embarrased about posting too many questions! Thank you soooo much for answering all my questions, and very fast,too! Thanks for also being extremely dedicated! It would be cool if you were my teacher in real life! :)
August 5, 2010

Homework
thanks writeateacher!
August 4, 2010

Homework
ps I haven't had the chance to get any of the books so far :(
August 4, 2010

Homework
I am going to a school for gifted kids on September and I am very excited! However, they gave me like 5 packets of hard homework that are very time consuming. On top of that, I have to read countless books, write book reports about them, and then choose 1 book and write like a...
August 4, 2010

English
thanks!
August 4, 2010

English
Are these correct? Here, I am supposed to label the sentences interrogative,exclamatory,imperative, and declarative. Then, I have to put the correct punctuation mark beside it. 1.Look at the apes Look at the ape (imperative) 2. How clever they are How clever they are! (...
August 4, 2010

English
thank you Ms.Sue! You werew a big help! The adverb is clearly early.
August 4, 2010

English
Can anybody explain to me howe to find the adverb in a sentence? For example 1.Maria rose early and watched the sun rise.
August 4, 2010

Math
Thank you Ms.Sue! Once again, you saved my educational career! I don't know what I'd do without you!
August 4, 2010

Math
Please help me! I found the mean temperature in a week in July, which was 87 5/7 degrees. I found the median temperature of the week, too which was 89 degress. Now can anybody help me compare the mean and median temperatures? This means a lot to e and I want to make a good ...
August 4, 2010

Math
Which % is lower 1.9% or 00131%?
July 29, 2010

engineering
why exponential model may be better choice for modelling data than the linear model.
June 19, 2010

math
A)4
May 30, 2010

Math
376.8 in.2
May 23, 2010

Algebra
29 C + C a right?
May 23, 2010

Math/ Probability
We have then only 6 positions to play with: 6 * 5 * 4 * 3 * 2 * 1 = 6! = 720
May 19, 2010

chemistry
Hey amanda what was the correct answer for g
May 7, 2010

algebra
-5x - 5y = -6 -5/2x - 5/2y = -6 a) (-2,2) b) (-2,-2) c)none d)infinite number of solutions and the answer i picked was c thanks
May 3, 2010

algebra
what is the solution of the following linear system? 5x - 2y = 15 5/3x - y = 5 a)(-2,1) b) none c)(3,0) d) inifinite number if solutions
April 29, 2010

math
How would you solve the problem (y^2-4w)^2
April 21, 2010

physical science
A butterfly at eye level is 18 cm in front of an plane mirror. You are behind the butterfly, 45 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?
April 5, 2010

MATH157
9-3= 6 We have then only 6 positions left to play with: 6 * 5 * 4 * 3 * 2 * 1 = 6! = 720
April 1, 2010

Statistics
Determine which of the four levels of measurement (nominal, ordinal, interval, or ratio) is most appropriate for each of the situations below. (2 points each part) 4a. The temperature of 10 light bulbs left burning for 5 hours 4b. The sample of pillows on the shelf categorized...
February 26, 2010

anthropology
Navajo Witchcraft
February 19, 2010

math
e = .02(190) = 3.8 right?
February 19, 2010

Physics
A penny is dropped from the observation deck of the Empire State building (370 m above ground). With what velocity does it strike the ground? Ignore air resistance. answer is in____ m/s.
February 7, 2010

Physics
An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.2 km?Answer is in ___ m/s2.
February 7, 2010

math 157
Sorry this is the right one.... The amount of background noise is important to television news reporters. One station developed the formula N = -r^2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How...
December 15, 2009

math 157
The amount of background noise is important to television news reporters. One station developed the formula N = -r2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many seconds after the speaker ...
December 15, 2009

math
FALSE
November 20, 2009

math
so approx. 9 gal.
November 11, 2009

math
how many real-number solutions does the equation have?
November 8, 2009

geometry
triangle, quadrilateral, and hexagon
October 24, 2009

math
convert into a fraction, mixed number, or whole number 62 1/2%
October 18, 2009

philosophy
Hey everyone! If anyone of you know the answer to the below please let me know!! 1) How do dreams figure into Descartes conclusions in the first meditation about our beliefs? 2) Why does Descartes think that clear and distinct perception much be infallible? 3)Why does ...
October 17, 2009

world history quick question
If you were a Native American in 1492 how might your opinion of Columbus changed? (Not a homework question just curious of your opinion)
September 20, 2009

world history quick question
I have: - He enslaved the natives and took their land -he Christianized and civilized the natives
September 20, 2009

world history quick question
How did Christopher Columbus change the Native American lives I need 5 reasons and I only have 2. (I need 3 more)? Plz help!
September 20, 2009

math
Which chart would be more effective a bar graph or pie chart?
September 19, 2009

Math
That helped, Thanks!
September 18, 2009

ALGEBRA
a. e = .02(175) = 3.5 b. e = .02(190) = 3.8
September 16, 2009

question about math (law of syllogism/detachment)
Does anyone know about the law of syllogism and law of detachment. If so, can you check my work.
September 13, 2009

French
Can you check these: Directions: State whether the sentences are vrai or faux? 1. Un bagage à main est une très grande valise. Answer: faux 2. Avant un voyage on fait ses valises. Answer: vrai 3. Un vol intérieur est un vol entre deux pays. Answer: vrai 4...
September 11, 2009

World History
(This is no homework question I was just curious) Without the invention of the printing press would the reformation still occurred?
September 9, 2009

World History
from your point of view do you think his choice of leaving the catholic church was right?
September 9, 2009

World History
When Henry viii broke away from the Catholic church was his reasoning justifiable? I really need help for this question.
September 9, 2009

World History
How do catholics gain salvation? How do lutherans gain salvation?
September 9, 2009

World History
Is the answer this: To brake away from the Catholic Church he called on the German Princes to overthrow the papacy in Germany and establish a reformed German Church.
September 9, 2009

World History
How did Marin Luther brake away from the Catholic Church?
September 9, 2009

finanace
After a protracted legal case, Joe won a settlement that will pay him $11,000 each year for the next ten years. If the market interest rates are currently 5%, exactly how much should the court invest today, assuming end of year payments, so there will be nothing left in the ...
September 8, 2009

math
8+4(2+7)/3=20
August 26, 2009

math
how do you solve this equation: 12n=9(n+10)
August 26, 2009

MATH Prob.
We have then only 6 positions to play with: 6 * 5 * 4 * 3 * 2 * 1 = 6! = 720
August 12, 2009

business statistics
The average length of a flight by regional airlines in the United States has been reported as 299 miles. If a simple random sample of 30 flights by regional airlines were to have ȭ = 413/6 miles and s= 42.8 miles, would this tend to cast doubt on the reported ...
July 30, 2009

Conflict Resolution and Team Dynamics
Define conflict and explain how constructive and destructive conflicts are different
July 29, 2009

math
We have then only 6 positions to play with: 6 * 5 * 4 * 3 * 2 * 1 = 6! = 720
July 29, 2009

business statistics
The director of admissions at a large university says that 15% of high school juniors to whom she sends university literature eventually apply for admission. In a sample 0f 300 persons to whom materials were sent, 30 students applied for admission. In a two-tail test at the 0....
July 29, 2009

business statistics
for a sample of 12 items from a normally distributed population for which the standard deviation is  = 17.0, the sample mean is 230.8. At the 0.05 level of significance, test Ho : μ ≤ 220 versus Hı: μ >220. Determine and interpret the p-value ...
July 29, 2009

aed/204
You have the ability to choose three or four books for your students. Based on what you have learned in this course, how can you assess the level of bias and stereotypes in the contents of these texts? What are your criteria? Is there a level of bias you feel is acceptable? If...
June 9, 2009

Psychology
If you are a University of phoenix student the reading should be in chapter 9 of Kowalski, R., & Westen. Finding that information helped me a lot. If you have other questions consult with your teacher.
May 23, 2009

reading
what are context clues
April 27, 2009

crt 205
2) Which of the following, if true, would best explain the material presented in the table? A) The total value of property owned by Black residents in Washington during the 1830-1860 period was similar to that in other cities during this period. B) Rising standards of living ...
April 23, 2009

Chemistry-help
I am rather confused about writing ionic equations. 1) SOLID sodium carbonate reacts with hydrochloric acid to give NaCl,CO2 & H2O. Is the ionic equation CO32-(aq)+2H+(aq)-> CO2(g) + H2O(l)? Do I consider SOLID sodium carbonate to be in aqueous state since it is a soluble ...
April 10, 2009

Chemistry
Solid sodium carbonate reacts with hydrochloric acid to give sodium chloride,carbon dioxide and water. When writing the ionic equation, do I need to write Na2CO3(s)or do I write CO32-(aq) on the left hand side of the equation?
April 7, 2009

Chemistry
If I react CuSO4 (solid) with aqueous NaOH, I will get Cu(OH)2 solid. How do I write the ionic equation?
April 6, 2009

Chemistry
The combustion of methane gives carbon dioxide and water. CH4 + O2 --> CO2 + H2O For state symbol of water, is it liquid state or gaseous state?
April 6, 2009

Chemistry
1) Bases that are soluble in water are known as alkalis. Is sodium oxide an alkali? 2) Indicators change colour at different pH. E.g. methyl orange changes colour in the pH range 3-5 while phenolphthalein changes colour in the pH range 8-10. How do I know which indicator to use?
April 5, 2009

Chemistry
During fractional distillation of ethanol/water mixture, why can't pure ethanol be obtained (i.e. distillated contains a little water)?
April 4, 2009

Chemistry
A textbook says that each ion in an ionic compound has the noble gas configuration. What about aluminium oxide?
April 3, 2009

Chemistry
Hi Dr Bob, I understand the 2nd method but need to clarify the 1st method.If I only wish to draw 1 Al and 1 O, then I need to include the "plus" sign and draw the 'dot and cross' diagram as 2[Al]+ 3[O] , with the charges of course, right? Posted by candy on ...
April 2, 2009

Chemistry
When drawing the 'dot and cross' diagram to show the ionic bonding in aluminium oxide, Al2O3, do we place the nos "2" and "3" in front of the brackets containing the 'dot and cross' diagram, e.g 2[Al]3[O]? I notice that some books place the...
April 2, 2009

math - question
Why are there always at least two solutions in quadratic equations?
February 27, 2009

math - 1 paragraph
Your friend is taking an algebra class that began one week after ours. Write out a paragraph or two, with examples if possible, explaining to your friend a general strategy for factoring in a very organized way.
February 23, 2009

Science
If pale green FeCl2 solution is left in the open for some time, will some of it gradually oxidise to become brown FeCl3 solution?
January 31, 2009

Chemistry
1) When we say calcium reacts readily with cold water, it means the reaction is moderately fast? 2) When we react Fe with dilute HCl, we get FeCl2 & H2. Why won't we get FeCl3? 3) Similarly, when we react Fe with CuSO4, displacement reaction occur to give FeSO4 & Cu. Why ...
January 31, 2009

Chemistry
1) When calcium is reacted with cold water, the equation is as follows: - Ca(s) + H2O(l) -->Ca(OH)2(aq) + H2(g) Isn't Ca(OH)2 insoluble? Why is the state symbol aqueous? When I conducted the experiment in a test tube with cold water, I got a white suspension (...
January 31, 2009

Calculus
A ball is thrown from the origin of a coordinate system. The equation of its path is y = mx - e^2m/1000 . x^2, where m is positive and represents the slope of the path of the ball at the origin. For what value of m will the ball strike the horizontal axis at the greatest ...
January 29, 2009

Chemistry-please help
1) Metals that are above hydrogen in the reactivity series react with dilute hydrochloric acid to produce hydrogen gas. Lead is just above hydrogen in the reactivity series.I read a book that says no reaction occurs between lead & dilute acid. Why? Is it because the reaction ...
January 26, 2009

Chemistry
Metals above hydrogen in the reactivity series react with dilute hydrochloric acid or dilute sulphuric acid to give metal chloride + hydrogen. 1)Is it correct to say that we use dilute acid,not concentrated acid because the reaction can take place with dilute acid & will be ...
January 25, 2009

Chemistry
I saw this sentence,"Most metals are strong and can be hit without breaking because they are HARD." But aren't pure metals soft and weak? Why do we still say they can be hit without breaking because they are hard?
January 24, 2009

history
How did the minority groups’ struggle for civil rights begin in the 1950s? Which event from this time do you think was most responsible for bringing public attention to the American Civil Rights Movement? Explain why you bringing public attention to the selected this event.
November 24, 2008

history
what were the long-term repercussions of the Potsdam Conference?
November 10, 2008

history
How were the various countries of the world affected economically by WWII? Who came out ahead? Which countries suffered monetarily? Who lost their empires? Who lost the most in human capital?
November 6, 2008

math
Tisha drove from Milwaukee, Wisconsin to Colorado Springs, Colorado. The trip was going to be 1500 miles. She drove 75 miles per hour all the way and stopped, a few times, setting her back about an hour. How long did it take her to get to Colorado Springs? 1500 divided by 75= ...
October 16, 2008

AP World History
I just don't get how to group the documents.
October 14, 2008

History
How do you see the Truman Doctrine fitting in with Monroe Doctrine and the Reagan Doctrine
June 29, 2008

History
what were the long-term repercussions of the Potsdam Conference?
June 29, 2008

History
Which countries suffered monetarily after WWII?
June 29, 2008

social studies
this question is pretty easy,according to my friends, but they wont help me, so plz let me know who the president is
May 5, 2008

social studies
which president had the most jellybeans consumed at their election?
May 5, 2008

math
Solve the pair of simultaneous equations x^2=4-y x=y+2
April 7, 2008

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