Friday
October 24, 2014

Posts by smiley


Total # Posts: 83

Teacher Aide
According to Ginott,if you make demands on misbehaving students, you can expect what?
May 17, 2014

science gr.8
A kicker strikes a ball with a strong force. a) Explain the evidence that shows the ball is not filled with liquid? b) Describe what is happening to the particles inside the ball? * chapter is about forces and pressure*
February 22, 2014

Science data
well not really because graphs are used to display your data, and just the date would be considered as ur info not the display.
February 22, 2014

science gr.8 science fair topic ideas
what are some ideas for science fair projects gr.8?!?! and please give an experiment with it thank u!!
January 23, 2014

socials gr.8!!
what contributions has the arab society made to the canadian society?!? ANSWER IN COMPLETE SENTENCES PLEASE AND EXPLAIN!!!!
January 21, 2014

Science
What is the difference between a controlled experiment and a natural experiment?
December 31, 2013

physics
The current-density magnitude in a certain circular wire is J = (2.75 × 10 10 ⁄ )r 2 , where r is the radial distance out to the wire’s radius of 3.00 mm. The potential applied to the wire (end to end) is 60.0 V. How much energy is converted to thermal energy ...
October 16, 2012

poems
does anyone know a poem about seashores and it has to be aroung grade 6 level thank u?
May 12, 2012

Math
u measure
April 22, 2012

language arts/math
what is an irregular polygon. what is congruent. what are corresponding angles. what are corresponding sides. FULL SENTENCES PLZZZ!!!!
April 22, 2012

life orientation
pollution, landfills, animals homes destroyed, less space on earth,
April 22, 2012

spanish
i think its nombre
April 22, 2012

Health: 6th grade
do u mean sling?
April 4, 2012

language arts
can anyone plz tell me a gud story if u were evr a shape for example this wut my friend her shape was a rectangle she wrote that the rectangle is going to apply for a job and the job is of an ice cream cart meaning like the ice cream cart and at the end the circle gets chosen ...
April 4, 2012

science
what are the characteristics of plants and animals
April 3, 2012

Penn Foster
D0 Light box
June 22, 2011

calculus
y'=xy/2ln y how do you solve the differential equation by seperation of variables
March 17, 2011

SCIENCE!!!!!!!!!!
a. Find the speed required to throw a ball straight up and have it return 6 seconds later. Neglect air resistance. b. How high does the ball go? Please Help!! Thanks!! :)
September 20, 2010

SCIENCE!!
a. Find the speed required to throw a ball straight up and have it return 6 seconds later. Neglect air resistance. b. How high does the ball go? Please Help!! Thanks!! :)
September 20, 2010

SCIENCE!!
a. When a ball is thrown straight up, by how much does the speed decrease each second? b. After the ball reaches the top and begins its return back down, by how much does its speed increase each second? c. Compare the times going up and coming down. Please Help!! Thanks!! :)
September 20, 2010

English
Name a database that would help you with current events. Please Help!! Thanks!!
September 20, 2010

English
What is the subject covered in the encyclopedia with the call number 150 ENC? Please Help :P Thanks!! :))
September 20, 2010

math
Well - Two fractions equivalent to 2/5: 4/10 an d6/15. - Two fractions equivalent to 7/11: 14/22 and 21/33. - Two fractions equivalent to 150/325: 300/650 and 450/975. To solve this you should of multiplied each fraction by a number (E.G. 2/2) For 2/5, I did 2/5*2/2= 4/10. I ...
May 24, 2010

math
What is a g
May 24, 2010

Earth science
what is the material between 2900 kilometers and 5200 kilometers below earths surface inferred to be
April 8, 2010

Judges
Explain possible consequences of ineffectiveness
February 15, 2010

Chem help
ln(K1/K2)=(∆Horxn/R)((1/T2)-(1/T1)) ln((6.5x10^-2)/K2)=((-49.5 kJmol^-1)/R)((1/(250+273.15))-(1/(100+273.15))) That's it! Just solve for K2. Don't forget that your R must have the units of kJ/molK. Hope this helps. Cheers!
June 7, 2009

chem
you have 157.5 mmol of AgNO3 and 243 mmol of MgCl2. From the balanced chemical equation, 1 mol of MgCl2 would consume 2 moles of AgNO3. It would then require 315 mmol of AgNO3 to completely consume the MgCl2. Therefore, AgNO3 is the limiting reactant and it would dictate how ...
June 7, 2009

Chem.
Its name is methyl ethanoate. First, you must find the carboxylate part. In your case, this is ethanoate. Next, determine what is attached to the O (not the one double bonded to C) of the carboxylate. In your case, this is CH3 and you would call this methyl. Lastly, combine ...
June 7, 2009

Math (PLEASE HELP!!)
Through how many degrees does the hour hand move... 1. In 3 hours? 2. In 2 hours?___________ 3. In 1 hour?___________ 4. In 1/2 hour?____________ 5. In 10 minutes?___________ Please Help!! Thank You!!
February 18, 2009

Math (PLEASE HELP!!)
Through how many degrees does the minute hand move... 1. From 10:00 to 11:00?_______________ 2. From 4:00 to 4:30?_______________ 3. From 6:00 to 6:15?_______________ 4. From 9:00 to 9:05?_______________ 5. From 3:00 to 3:01?_______________ Please Help!! Thank You!!
February 18, 2009

riddle
argh!!
February 8, 2009

riddle
Here is another one: J,F,M,A,M,J,J,A,.....
February 8, 2009

riddle
Hint: The answer is not "E".
February 8, 2009

riddle
what comes next? O,T,T,F,F,S,S,E,......
February 8, 2009

English
I think he did set more than 1 0r 2 records, right?
February 8, 2009

English
Power & greed are sometimes the main cause of war because: Power: You are strong & want to gain more land, food, things, etc... Definition: The possession of control or command over others; authority. Ability to do or act; capability of doing or accomplishing something. Greed...
February 8, 2009

English
Actually, I wanted to use the sentence below: During May 15-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). Does that make sense? **It makes more sense because it was during that year, not between it. Thanks!!
February 7, 2009

English
Which sentence is better? 1. Between May 15, 1941-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). 2. Between May 15-July 17, 1941 DiMaggio held the longest consecutive game hitting streak (56 games). Please Help!! Thanks!!
February 7, 2009

English
Which sentence is better? 1. On May 15, 1941-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). 2. On May 15-July 17, 1941, DiMaggio held the longest consecutive game hitting streak (56 games). Please Help!! Thanks!!
February 7, 2009

English
which sentence is correct, #2 or #3? SraJMcGin chose #2 & Ms. Sue chose #3. I do not know which one to choose..... HELP!!
February 7, 2009

english
hi
February 7, 2009

psychology
hi
February 7, 2009

Chemistry------DrBobb..
hi
February 7, 2009

Ionic Crystal Structures
How did you get that answer then?
February 6, 2009

spelling
I'm sorry yes. could you tell me what is a non characteristic of region? Please help, thank you.
February 4, 2009

spelling
I am doing a Frayer model and my spelling word is region. That is a non-characteristic for region? Thank you for your help.
February 4, 2009

Math
Julia wants to build another garden wall, 10 bricks long and 3 bricks high. Can she build it with red and white bricks, so that no two bricks of the same color are next to each other? r w r w r w r w r w w r w r w r w r w r r w r w r w r w r w I say yes. Could you help me if ...
January 29, 2009

Math
Ray is setting the table for a birthday diner.He needs to set 12 places at a round table.he has 3 different kinds of plates:white plates; blue plates; and gold plates.How can he set the table so that no two of the same kind of plates are next to each other? Thank you for your ...
January 29, 2009

Math
A trapezoid, parallelogram, and rhombus. they all have 45 degrees angles.
January 28, 2009

Math
a parallelogram.
January 28, 2009

sose
what is the meaning of life?
May 20, 2008

Chemistry
its wrong!
May 8, 2008

CHEMISTRY
What is the effect of cyclohexane as the solvent in the electrophilic aromatic substitution of acetanilide by bromine?
January 19, 2008

chemistry
What is the effect of using cyclohexane as the solvent in the bromination of acetanilide?
January 19, 2008

chemistry
Why can't we add charcoal to benzoic acid in purification by sublimation
November 23, 2007

analytical chemistry
"experiment: spectrophotometric determination of the acid dissociation constant of methyl red" 1. Why is pH plotted against log([MR-]/[HMR]) to get the pKa of methyl red? 2. Why is it right that HMR has a pH equal to 2 and MR- to have a pH equal to 8?
September 22, 2007

chemistry
"experiment: spectrophotometric determination of the acid dissociation constant of methyl red" 1. Why are matched cells used in the experiment? 2. Why is pH plotted against log([MR-]/[HMR])? 3. Why is it right that HMR has a pH equal to 2 and MR- to have a pH equal ...
September 20, 2007

chemistry
Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not followed? Reagents added: 1st: Fe3+ solution 2nd: 2.00 mL 10% NH2OH-HCl (hydroxylamine hydrochloride) 3rd: excess 0.20% 1,10-phenanthroline 4th: 1.00 mL ...
September 15, 2007

chemistry
Why is it important that the sequence of addition of reagents be followed? What could possibly go wrong when this is not followed? Reagents added: 1st: Fe3+ solution 2nd: 2.00 mL 10% NH2OH-HCl (hydroxylamine hydrochloride) 3rd: excess 0.20% 1,10-phenanthroline 4th: 1.00 mL ...
September 15, 2007

chemistry (spectrophotometry)
I'm sorry but I still don't understand the concept of spectral analysis and the baseline. What does these words mean and what are they for? I'm confused... Note: the experiment determines the concentration of iron in iron(II) phenanthroline by spectrophotometry.
September 15, 2007

chemistry
Why is an Fe3+ solution instead of an Fe2+ solution used in calibrating the spectrophotometer? Note: hydroxylamine hydroxide is added to the Fe3+ solution then 1,10 phenanthroline is added to the solution after the addition of hydroxylamine hydroxide. After these additions, a ...
September 15, 2007

chemistry
Why should an Fe3+ solution be used in calibrating the spectrophotometer for the spectrophotometric determination of iron in Fe2+ complexes?
September 14, 2007

additional question
what is apectral scanning? I really don't have an idea on this. As for the baseline, we indicated a range of 350 nm to 600 nm in the spectrophotometer and found that lambda max is at 510.4 nm. What then is the significance of the baseline?
September 14, 2007

chemistry
1. Why Beer's law is expressed in terms of absorbance instead of transmittance? 2. What is the significance of spectral scanning? 3. What is the importance of the baseline?
September 14, 2007

chemistry
In experiment concerning potentiometric determination of puriy and Ka of KHP, we obtained an experimental pKa of 5.04 and when compared with the theoretical pKa of 5.51, we obtained a % relative error of 192%. Could this error mean that a cerain impurity in the KHP sample ...
September 10, 2007

chemistry
Based on the experimental data, I was able to calculate the experimental pKa value which is 5.04 and the literature value of the pKa for KHP is 5.51. If I would be computing for the relative error between the two pKa's it would be 8.52994555%. But then, what i need is the ...
September 8, 2007

chemistry
Based on the experimental data, I was able to calculate the experimental pKa value which is 5.04 and the literature value of the pKa for KHP is 5.51. If I would be computing for the relative error between the two pKa's it would be 8.52994555%. But then, what i need is the ...
September 8, 2007

chemistry
what does it mean if I got a % relative error that is higher than 100%? - would it mean that I did the experiment erroneously?
September 8, 2007

chemistry
The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the percent phosphorus. My...
August 31, 2007

chemistry
So, the moisture content (as received) is ((0.5117-0.4998)/0.5117)* 100 = 2.326% and the the moisture content (dry basis) is ((0.1*0.4998)/0.5117)*100 = 9.767% and when the sample is completely dried, it would weigh 0.4998-(0.1*0.4998) = 0.4498 Am I right?
August 31, 2007

chemistry
Please help me through this problem... A 0.5117 gram fertilizer containing phsphorus was oven dried. The weight of the dried sample is 0.4998 grams. However, 10% moisture is still retained in the sample. Calculate the moisture content in the sample in as received and dry basis...
August 31, 2007

chemistry
Please help me with my formal report on "Potentiometric Determination of the Purity and Dissociation Constant of Potassium Hydrogen Phthalate" Please give me links to websites that could be used for my reference... In addition, please do suggest books that discuss ...
August 19, 2007

chemistry
Again, from my previous question about gravimetric analysis... Why can't NH4Cl be used as a substitute for NH3 in precipitating MgNH4PO4*6H2O? Please critique my thought: I found out that a precipitate is more soluble at lower pH and since NH4Cl acidic, it will cause the ...
August 19, 2007

chemistry
In precipitating magnesium ammonium phosphate, why can't NH4Cl be used as a substitute for NH3? Isn't pH critical? The solubility is vastly different at pH 9 versus pH 4. In addition, how do you obtain NH3 from NH4Cl? The NH3 is for pH adjustment as Bob Pursley writes.
August 18, 2007

chemistry
Experiment: Gravimetric Determination of Phosphorus in Fertilizer Samples 1. Can NH4Cl be used as a substitute to precipitate the phosphorus in the sample? Why or why not? - I think, NH4Cl can be used although I'm not quite sure if Cl- ions have some effects to the ...
August 17, 2007

chemistry
experiment: Gravimetric determination of moisture in fertilizer samples 1. What are the advantages of weighing by difference to direct weighing when using an analytical balance? 2. Why are the samples grinded before drying in the oven? Weighing by difference minimizes errors ...
August 10, 2007

chemistry
1. What are other methods of moisture determination besides oven drying? 2. During the drying of samples, the weight is considered constant when the last two weights are within ± 0.0003 grams. What is the reason for this? For #1, here is a site for you to read. (Broken ...
August 10, 2007

chemistry
Topic: Iodometry 1. the reason why the Cu2+ solution has to be titrated immediately after addition of KI - I thought, because if allowed to stand for a long time, iodine will volatilize and a change in concentration of iodine will occur...is this right? Please correct me if I...
July 29, 2007

chemistry
Topic: Iodometry 1. the reason why the Cu2+ solution has to be titrated immediately after addition of KI Answered above.
July 29, 2007

chemistry
Topic: Iodometry 1. The importance of precipitating the Cu2+ ions using NH3 and redissolving it with acetic acid 2. What are other means of detecting endpoint in iodometry aside from adding starch indicator 1. A pH that is too low leads to excessive oxidation of iodide ion to ...
July 29, 2007

chemistry
What is an aliquot factor? It is a whole divisor. For instance 5 is an aliquot factor of 15, and 15 is an aliquot factor of 150. I'm sorry, but I don't seem to understand it. For example, how do you get the aliquot factor of 50? 2, 5, 10, 25 would be aliquot factors of...
July 14, 2007

chemistry
Where can I find the answers to these questions in my text, "fundamentals of analytical chemistry" by skoog, west, holler and crouch. 1. Why is acetylsalicylic acid analyzed using back titration? 2. Discuss the importance of simmering the tablet in the NaOH solution ...
July 14, 2007

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