Thursday
November 27, 2014

Posts by dexter


Total # Posts: 47

Chemistry
this does not help . . . . can any one else help me please
October 19, 2014

Chemistry
when 2g of NaOH were dissolved in 149 g of H2o in a calorimeter at 24 degrees C the temperature of the solution went up to 29 degrees C. If the calorimeter constant was 11 cal/C find delta H for the solution of one mole of NaOH in H2O
October 19, 2014

math
83 3rd graders 115 4th graders 150th graders all the 5th graders will be on one side and all the 4th graders will be on the other side the 3rd graders will be split up so that the two sides will have equal number of student how many 4th graders ?how many 3rd graders will be ...
September 30, 2014

Area of rectangle
The length of the flag needs to be 1.9 times the height. If the flags height is 3 feet, then what is the area of the flag?
April 16, 2014

science
What is the gram formula mass of NaC2H3O2 multiplied by 10H2O
February 24, 2013

Art Please check answers
These are all right i got 20/20
December 3, 2012

english literature
witty characteristics of Touchstone in as you like it
July 10, 2012

fsu
Red light has a wavelength of 691 nm. Convert this wavelength to meters.
October 10, 2011

Chemistry
Sorry didn't see...thank you!
June 17, 2011

Chemistry
Please help verify my answer. Not confident it is right: please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb...
June 17, 2011

Chemistry
Please help verify my answer. Not confident it is right: please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb...
June 17, 2011

Chemistry
Please disregard my 2 comments after. I finally had my Eureka moment and figured this all out. Thanks to your help and researching a bit more I feel I understand this now. Your efforts in helping me were not wasted lol. Thanks again!
June 16, 2011

Chemistry
Hi again - was just comparing part c with your notes and I have an extra Oxygen on left side that right side doesn't have?? Perhaps your mistaken and oxygen is reduced?
June 16, 2011

Chemistry
Hi yes sorry the arrows didn't work out when I copied the question. For the following in your answer 2SO2 + O2 ==> 2SO3 And that is a REDOX equation. S changes from +4 to +6; oxygen changes from zero (the O2 is zero while the O in SO2 is unchanged) to -2 in SO3. Why is ...
June 16, 2011

Chemistry
Please help me verify: The following reactions are involved in the formation of acid rain. Use oxidation numbers to identify which of these reactions are REDOX reactions. a. 2SO2(g) + O2(g) �� 2SO2(g) -2 -2 0 -2 -2 No change - not REDOX reacton b. 3NO2(g) + H2O(l...
June 16, 2011

Chemistry
please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) +2 +4 +2 +4 Zn(s)->Zn2+(aq)+2e- (zinc is oxidized...
June 16, 2011

Math
Hi, no it wasn't. I think the assessment website is buggy because it didn't feel right. I have to contact the college and inquire. Thanks anyways as your answer made me see that there is a problem with site.
June 16, 2011

Math
Thank you...
June 16, 2011

Math
Hi I have a sample question for a math assessment that I wanted to ask about: What number is expressed by (9 x 6) -s- 3? a 18 b 27 c 6 d 21 Which of these answers is right and what is "s" suppose to mean? Is S like some sort of fixed value?
June 16, 2011

Chemistry
Yes that's right, free states have oxidation number of zero. Ok will work out reduction and oxidation, made it a bit clearer. Thanks for your help, very valuable :)
June 14, 2011

Chemistry
Following question I need help with part b) Please verify my answer for part a) too if possible. Consider the following reaction for silver tarnishing: 3Ag2S(s) + 2Al(s) -> 6Ag(s) + Al2S3(s) a. State the oxidation number for each element in the reaction. 3Ag2S(s) + 2Al(s...
June 14, 2011

Chemistry
Having it explained that way makes it easier to understand and helps to verify answer in the end which my course didn't explain. Thank you.
June 14, 2011

Chemistry
Please help me verify the following question: Consider the following ion; XF2-2 What is the oxidation number assigned to element “X”? Show your work My answer: X F2-2 X -1(-1) X -3=0 X = +3 Please let me know if right. Many thanks!
June 14, 2011

Chemistry
That's what I thought....Thank you !!!
June 5, 2011

Chemistry
Hi there - I'm going to post the question as written in my book. Three 20.0 mL samples of nitric acid are titrated with a 0.200 mol/L solution of sodium hydroxide. The results for the three trials are shown in the table below. What is the concentration of the hydrochloric ...
June 5, 2011

math
Plywood is sold in rectangle sheets 4 feet wide and 8 feet long. How many 4x8 sheets of plywood are needed to completely cover a rectangle shaped floor measuring 16 feet by 12 feet
April 14, 2011

Math
pls. verify: 4x^3y^-2 / 2x^-1y^4 = 2x^4y^-6 [w^1 / w^-3]^-4 = 1/w^16
November 23, 2010

math
Thank you Sir.
November 20, 2010

math
Hi - please help me with this one: (5b^2c^1/4)^3 is the answer: 125b^6 3c ^ 3/4
November 20, 2010

Math
Not clear about this, please help me understand the steps: (5b^2c^1/4)^3
November 20, 2010

Math
Thank you! Is that 9 cm or just 9 ?
November 20, 2010

Chemistry
Please read to the bottom - This help was wonderful and absolutely correct, I'm asking a bit more regarding the same question, please read below. Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe how you would ...
October 15, 2010

Chemistry
I got lost in all the material I'm learning which is why I posted here. Thank you for helping me sort all this out. I was looking at the problem all wrong thinking that the NaOH was a liquid. Very new to chemistry...slowly but surely getting it, thanks for your help, it ...
October 15, 2010

Chemistry
Please read to the bottom - This help was wonderful and absolutely correct, I'm asking a bit more regarding the same question, please read below. Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe how you would ...
October 15, 2010

chemistry
amazing help - this is what I got too however they also want me to explain the steps I would take to prepare this solution. I'm using a graduated cylinder to measure the sodium hydroxide and need to convert the 5 grams to ml. I'm not sure the steps to take. Do I use ...
October 14, 2010

chemistry
Imagine that you have been asked to prepare 500ml of a 0.25 mol L solution of Sodium Hydroxide, NaOH. Describe how you would prepare this solution. Include any calculations that you would perform.
October 14, 2010

advanced math
Omelette du fromage!
July 6, 2010

algebra
Omelette du Fromage?
July 5, 2010

math
ok i get it , thanks
April 11, 2010

math
im not sure how to complete the problem becuase my answer was 9312.82, not sure if this is correct
April 11, 2010

math
Barbara knows that she will need to buy a new car in 4 years. The car will cost $15,000 by then. How much should she invest now at 10%, compounded quarterly, so that she will have enough to buy a new car? Round to the nearest cent.
April 11, 2010

Biology
1) Why is it appropriate to call the endomembrane system a "system?" 2) The selective permeability of biological membranes is dependent on _______________. 3) Why is it unusual for a phosphlipid molecule to flip from one face of the membrane to the other? 4) What do ...
January 9, 2010

Chemistry
Dimethylsulfoxide (C2H6SO), also known as DMSO. How many moles of carbon are in 4 moles of DMSO? a 1 b 2 c 4 d 8 e not enough info
November 1, 2009

Chemistry
How many molecules of carbon dioxide (CO2) are there in 88g of carbon dioxide? a. 1 b. 2 c. 88 d. 1.2 x 10 24 e. not enough info
November 1, 2009

Geography (Urgent)...
I did calculate my footprint. It is larger than the world (mine is 3.4 vs. 2.2) I am wondering why this is. -Dex
November 17, 2008

Geography (Urgent)...
I need to know 3 reasons why my Ecological Footprint is smaller than the world average Footprint (3.4 vs. 2.2) I am unsure as to how mine alone is larger than the whole world's. THANKS -Dex
November 17, 2008

science
im doing this project too its a levelled assessed task and i needed help is that cheating?!!
October 21, 2006

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