Thursday

April 17, 2014

April 17, 2014

Number of results: 144,482

**O.CHEM -> PLEASE CHECK!!**

Thank you...good to know, but isn't there a "Dr.Russ" that works with Organic Chem??
*Wednesday, March 12, 2008 at 9:48pm by K*

**Chemistry**

Can someone please check to see if I balanced this chem. equation which is an incomplete combustion reaction: 2C3H8 + 11O2 ->> 3CO2 + 4H2O +2CO +C(s) My answer: 7C3H8 +22O2 -->> 6CO2 + 28H2O +4CO +11C Thanks!
*Tuesday, October 13, 2009 at 4:53pm by Anna*

**O.CHEM -> PLEASE CHECK!!**

thank you
*Wednesday, March 12, 2008 at 9:48pm by K*

**O.CHEM -> PLEASE CHECK!!**

1. hydrogen bonding causes higher boiling points water=> highest of course at 100°C dimethylether=> -24.8 °C ethyl alcohol=> 78.4 °C CH3CH2SH (Ethanethiol)=>35 °C so it's correct. 2. can't help here, I know what reacts and such but not how reactive they are (...
*Wednesday, March 12, 2008 at 9:48pm by ~christina~*

**Logic**

Can someone please help me solve these problems? I have to use the 17 rules of inference to prove the arguments valid: 1) 1. T = R 2. (~R > ~T) > (P . ~S) / ~S v T 2) 1. C > F 2. A > B 3. ~F . A 4. ~C > (B > D) / B . D 3) 1. (S v Q) / ~P > ~S 4) 1. D > ...
*Tuesday, August 16, 2011 at 1:52pm by Brayden*

**O.CHEM -> PLEASE CHECK!!**

Our regular chemist expertm DrBob222, is taking a vacation for a week, so it is quite likely that no one will be available to help you with your organic chem questions. Thank you for using the service, and I hope that you will continue to do so. Perhaps another person using ...
*Wednesday, March 12, 2008 at 9:48pm by drwls*

**chemistry**

i have to write chemical formulas and balance them: nitrogen and oxyen---> nitrogen monoxide N2+02---->2NO nitrogen monoxide and oxygen----> nitrogen dioxide gas. NO2+O---->NO2 (i'm not sure about this, please check) nitrogen dioxide and water----> nitrous and ...
*Sunday, January 13, 2008 at 2:08am by Anonymous*

**chem--please help me check my answer!!**

write an ionic and net ionic equation for the following reaction between Fe3+ and NH4OH. Please check my answer!! Thank you. My answer is: ionic: Fe3+(aq) + NH4OH--> Fe(OH)3 + NH4+ net ionic: Fe3+ +OH- -->Fe(OH)3
*Monday, October 25, 2010 at 6:03pm by Christine*

**math- check this please**

1. 3t<-9=t<-3 2.4m>8=m>2 3.10<-2w 5<w 4.-20>-5c 4>c 5.-27>3z -9>z 6.-7b>42 b>6
*Monday, November 19, 2007 at 6:09pm by james*

**CHEM**

At constant pressure, which of these systems do work on the surroundings? Check all that apply. 2A (g) + B(s) --> 3C(g) 2A (g) +2B (g) -->5C(g) A(g)+ B(g) --> C(g) A (s) +2B(g)--> C(g)
*Friday, February 10, 2012 at 6:32pm by Akle*

**Grade. 12 Chem - Please check my answer!**

Determine whether the following are redox reactions. If a redox rxn., identify the oxidized reactant and the reduced reactant. a)N2 + 3H2-->2NH3 : YES, Oxidized=H, Reduced: N b)2H2O2-->2H2O + O2 : YES, Oxidized=H, Reduced: O c)2HBr + Ca(OH)2 -->CaBr2 + 2H20 : N0 d)2Fe...
*Sunday, June 1, 2008 at 1:41pm by Laura*

**math**

Solve this : (8x^3 ) - (168x^2) + ( 864x) = 1120 please >>>>>>>>>> I need it >>> please
*Monday, January 21, 2008 at 2:14pm by Robert*

**Math ~CHECK MY WORK~**

With stars are my answers. Please check them if they are wrong please tell me the right ones. Number 1 (the bottom one) I don't get it so please help me with that one please! 1) You have $60 in your wallet and want to buy some new CDs. If the CDs are $11 each, what number of ...
*Thursday, January 16, 2014 at 4:13pm by Wendy *

**Discreet math**

If you need a proof of the proposition/identity, please first double check the expressions. [(pvq)^(p=>)^(q=>)]=>r[(pvq)^(p=>)^(q=>)]=>r Not sure if something is missing where expression is indicated in bold. Perhaps there are other problems.
*Tuesday, June 25, 2013 at 1:08am by MathMate*

**AP Chem**

A solution of potassium phosphate is mixed with a solution of calcium acetate. I am supposed to write a net ionic equation. Doesn't need to be balanced. Here is what I did: K3PO4(aq) + Ca(C2H3O2)2 --> KC2H3O2 + Ca3PO4 3K+ + PO4-3 + Ca+2 2(C2H3O2-) --> K+ + C2H3O2 + 3Ca+2...
*Wednesday, October 3, 2007 at 6:37pm by Please check*

**Math**

help please anyone? i'm having a hard time solvig these problems LOGIC CONDITIONAL PROOF. HOMEWORK HELP PLEASE!? A. 1. A -> (B -> C) 2. (C ^ D) -> E 3. -F ->(D ^ -E) / :. A -> (B -> F) B. 1. (A v B) -> -(C ^ D) 2. (-C v -D) -> (E <-> F) 3. (E <...
*Thursday, January 17, 2013 at 1:56am by Moses*

**chem -repost for bobpursley**

i don't know how to solve this. looked through all my notes but i'm not sure what kind of formula i am to use or if i even need one! please help me to understand the theory behind this: "calculate the work need to make room for the products in the combustion of S8(s) to SO2(g...
*Sunday, April 17, 2011 at 8:53pm by please, help me *

**chem grade 12**

<<<<<<<<<<>>>>>>>>>>>> First : Al in III A >>>> Al = 3+ Second : O must be 2- Third : count and S = 6+
*Tuesday, January 31, 2012 at 9:49pm by IChO 2012 Washington DC*

**math-please check my answer**

0.6x + 4 < 1.0x - 1 6x + 40 < 10x - 10 4x > 50 x > 12.5 can someone please check my work and tell me if I am right?
*Friday, July 30, 2010 at 10:22pm by Michelle*

**Math-truth table, please check my work!**

p -> ~q , p -> q Are these Equivalent statements? This is my try. Please let me know if these truth tables are correct. p -> ~q p q p -> ~q p q p -> q T T T T T T T F T T F F F T F F T F F F T F F T The statements are not equivalent.
*Wednesday, January 9, 2013 at 2:24pm by tony*

**Geometry**

Given circle A with circumference 20 pi and the length of arc KD equal to 10/3 pi. Find the area of the shaded region. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Is there any ...
*Sunday, March 6, 2011 at 4:55pm by Gemma*

**chem- check my answer**

magnesium hydroxide + hydrobromic acid --> is the formula for that Mg(OH)2(s) + HBr(aq) ->H2O(l) +BrOH(s) and are the physical states correct??
*Saturday, April 9, 2011 at 3:32pm by hannah*

**Chem**

Once again, not sure why the choices don't show up but here they are: Ca>Na>k Al>Si>P K>Ca>Ge Na>P>Cl Na>Rb>Cs
*Saturday, April 19, 2008 at 1:43pm by Ginger*

**Simple Chem Question: Please Answer**

reactants>>products; yes correct
*Monday, May 24, 2010 at 10:18pm by bobpursley*

**chemistry **

Which of the following reactions have a positive ΔSrxn? Check all that apply. A(g) +B(g) -----> 3C(g) A(g)+ B(g)------> C(g) 2A (g) +2B (g)-----> 3C(g) A(s)+B(s)------> C(g) I picked the first one and it marked me wrong. Please help(:
*Wednesday, March 14, 2012 at 6:38pm by Jerry*

**math(check answers please)**

PLEASE CHECK THESE ANSWERS compare the pair of numbers use <,>,= 3/4 _ 6/8 A.3/4=6/8(I PICKED THIS) B.3/4<6/8 C.3/4>6/8 Write the decimal as a fraction or mixed number in simplest form. 3.45 A.4 3/4 B.4 9/20 C.3 3/4 D.3 9/20(I PICKED THIS
*Wednesday, November 20, 2013 at 5:44pm by matt*

**Math**

Can someone check this for me please... 4x + 8 >= (that is greater and equal to) 4 and 2x - 13 >= -5 the solution: {x|x>= 4} on the graph the highlighted line goes to the left...is this correct?
*Sunday, November 2, 2008 at 11:51am by Carmen*

**please check**

Prob.1 and 2 are correct. 3. [7 - x] > 2. Eq1: +(7 - x) > 2. Eq2: -(7 - 7)>2. Eq1: +(7 - x) > 2, 7 - x > 2, -x > 2 - 7, -x > -5, Divide both sides by -1 and reverse inequality sign: x < 5. Eq2: -(7 - x) > 2. -7 + x > 2, x > 2 + 7, x > 9. ...
*Wednesday, November 10, 2010 at 6:28pm by Henry*

**AP CHEM please help**

Write the standard line notation for each cell below. IO3-(aq) + Fe2+(aq)--> Fe3+(aq) +I2(aq) ________________________________________ H2O2 + 2 H+ + 2 e- --> 2 H2O E = 1.78 V O2 + 2 H+ + 2 e- --> H2O2 E= 0.68 V ________________________________________ Mn2+ + 2 e- --&...
*Tuesday, March 6, 2012 at 2:07pm by Janvi*

**chem. check!**

Can u please check this and help me on 4 questions I did not do. Thanks 1.
*Monday, June 19, 2006 at 1:10pm by hey.*

**math**

NOW Go back and check the answer. Here is your problem statement: 1>2h+3>-1 and I said the solution was: -2 < h < -1 So try h = -2 then 1 > 2*-2 +3 > -1 ???? 1 > -4+3 > -1 ??? 1 > -1 >-1 yes, as expected right on the border Now try h =-1 ,that ...
*Thursday, December 27, 2007 at 3:56pm by Damon*

**Chemistry**

OMG i'm soo screw for chem.. >_<ahhh i wonna drop it soo bad!!! PLEASE help me.... AND THANK U!!! Balance redox equations MnO4 - + HCO2H --> Mn^2+ + CO2 K2S3O6 + KClO + KOH --> K2SO4 + KCL + H2O
*Tuesday, September 25, 2007 at 1:50pm by saLIna*

**Chem Help!**

I really need help for my homework on balancing equations please show all the work including the coeffients if needed. I need help with 3 questions, 1) NaN3 -> Na + N2 2) NO2 + O2 -> NO + 03 3) LiOH + CO2 -> Li2CO3 + H2O
*Saturday, March 15, 2008 at 3:09pm by Tania*

**Please help**

Jan >> 31 - 13 = 18 Feb >> 28 Mar >> 31 Apr >> 30 May >> 31 June >> 16 Add the days.
*Thursday, June 16, 2011 at 5:54pm by Ms. Sue*

**Algebra-Please check**

5 - sqrt of 20x + 4 >= -3 5- 20x + 4 >= -3 5-4 - 20x >= -3 1 - 20x >= -3-1 -20x >= -4 x<= -15 Possible answers are x<=3 -1/5 <= x<= 3 x >= -1/5 x >= 0 I think it is -1/5<=x<=3 because both solutions work
*Tuesday, October 12, 2010 at 12:18pm by Juliette*

**MATH>>>>look.need.help.please.**

what is the value of the expression (4.32 x 10^-3) + (6.025 x 10^-3) ? i came up with either 0.010345*10^-3 or 10.345*10^-3 and when i check them they're both wrong.
*Thursday, February 24, 2011 at 7:34pm by angiie*

**O.Chem -> PLEASE CHECK!!**

Please check these out for me, if I am correct: Match the following statements with SN1 or SN2 reactions: 1) The order of reactivity in alkyl halides is methyl>primary>secondary>tertiary 2) There is an intermediate carbocation 3) The rate-limiting step involves the ...
*Wednesday, March 12, 2008 at 9:31pm by K*

**chem**

Check this and see if it balances. CaC2 + 2H2O ==> Ca(OH)2 + C2H2
*Tuesday, April 13, 2010 at 9:41pm by DrBob222*

**Algebra-Please check my work**

Posted by JoniAnne on Wednesday, October 20, 2010 at 11:50am. Please check- Solve 3 > sqrt(3x) 3x >=o x>=o/3 x>=0 square both sides and you have 3x < 3^2 3x,9 x<9/3 x<3 answer is 0<=x<3 correct or not? 3(cube) sqrt(2-5) = 3 cube both sides = 2-5x = ...
*Wednesday, October 20, 2010 at 3:08pm by JoniAnne*

**Algebra-Please check-I'm desperate**

Posted by JoniAnne on Wednesday, October 20, 2010 at 11:50am. Please check- Solve 3 > sqrt(3x) 3x >=o x>=0/3 x>=0 square both sides and you have 3x < 3^2 3x,9 x<9/3 x<3 answer is 0<=x<3 correct or not? 3(cube) sqrt(2-5) = 3 cube both sides = 2-5x = ...
*Wednesday, October 20, 2010 at 4:36pm by JoniAnne*

**chem**

For this problem, will someone please check my answer? How many grams of oxygen are produced in the decomposition of 5.00g of potassium chlorate? KClO3(s)--->KCl(s)+O2(g) [the equation may not be balanced] My answer is 1.96 g of O2. The balanced equation is 2KClO3 ==> ...
*Thursday, March 22, 2007 at 5:04pm by Fiona*

**organic chem**

I dont think I can use Grignard can I? PLEASE HELP. CH3CH2Br + CH3CH2Mg/EtoEt -> CH3Ch2Ch2Ch2MgBr + NaN3/EtOH -> CH3Ch2Ch2Ch2N=N=N + LiAlH4/H20 CH3Ch2Ch2Ch2NH2? Then what? does this even work?
*Tuesday, April 26, 2011 at 5:16am by lauder*

**Math>>>>if anyone could check my answer**

Where is your answer to check? You just multiply them distance= 9.46E12km/lightyears*1.08E8lightyears.
*Thursday, March 31, 2011 at 11:39pm by bobpursley*

**math**

1)3/4+x >1 is it x>1/4 ,x< -1/4? 2)6x+8 > 4 is it x>-2/3 ,x< -3? 3)|x+0.5|=0.25 is it x=-o.25,-0.75 4)|7-x|>2 is it -x>-5 ,-x<-9
*Tuesday, November 9, 2010 at 7:51pm by check this please!!! thank you*

**chem101**

which of the following compounds have polar bonds and a net dipole moment? a) H3COH b) H3CCOCH3 ALSO PLEASE CHECK THIS, RANK THE FOLLOWING FROM MOST TO LEAST ACIDIC COMPOUND: A)H2SO4>H3CCO2H>H20 B)H3CCH2NH2>H3CCH2OH>H3CCO2H
*Sunday, September 11, 2011 at 9:45pm by sammy*

**Algebra-Please check**

Please check- Solve 3 > sqrt(3x) 3x >=o x>=o/3 x>=0 square both sides and you have 3x < 3^2 3x,9 x<9/3 x<3 answer is 0<=x<3 correct or not? 3(cube) sqrt(2-5) = 3 cube both sides = 2-5x = 27 -5x = 25 x = -5, correct? Thank you
*Wednesday, October 20, 2010 at 11:50am by JoniAnne*

**chem equations**

could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is 2CH4+2NH3+3O2--&...
*Sunday, May 6, 2007 at 12:00pm by bex*

**Math ~ Check Answers ~**

Please Check My Answers. 1: Solve each inequality. m 7 < 6 a. m < - 1 b. m > 1 c. m < 13 d. m < -13 2: Solve each inequality. p + 12 > 9 a. p > 21 b. p > 3 c. p > -21 d. p > -3 My Answers: 1: b. m > 1 2: a. p > 21
*Thursday, January 16, 2014 at 2:42pm by Cindy*

**math- check this please**

4. 4>c 6. b>6
*Monday, November 19, 2007 at 6:09pm by james*

**Math ~CHECK MY WORK PLEASE~**

Hello, Please check my answers, with stars (*) are my answers! Please check if they are wrong please tell the right answer and why it is right (explain it) so I can understand why! Thanks! For questions 1-2, solve the inequality. 1.) x + 8 < -28 a~ x < -36 ****** b~ x &...
*Friday, January 17, 2014 at 4:37pm by Jenny*

**chem**

The arrow is made as --> or ==> or >>> dHrxn = (n*dHf products) - (n*dHf reactants)
*Thursday, November 8, 2012 at 4:40pm by DrBob222*

**Chem**

please answer this>??
*Tuesday, January 25, 2011 at 2:20pm by maretcheal*

**logic**

I need help proving these arguments using rules of inference, please. (S>B) > (SvK) (Kv~D) ~ (H>S) ~S.W / ~H ~A > (B>~C) ~D > (~C >A) D v ~A ~D
*Wednesday, May 18, 2011 at 3:42pm by Elaine*

**Chem**

complete and balance the following decompition equations CaCO (heated) --> 3 please tell me how to do this and what exactly is suppose to be going through my head while doing this. I can balance these equations with no problem I just have no idea what to do...
*Wednesday, December 17, 2008 at 7:09pm by Chem*

**Math 8 ->> Genie**

Please check your arithmetic. I think my answer is right -- but I'm not absolutely sure.
*Tuesday, October 16, 2012 at 8:03pm by Ms. Sue*

**Gen Chem**

ICE techniques Si(s)+ 2Cl2(g) >> SiCl4(g) Keq= [SiCl4]/[Cl2]^2 Cl2 SiCl4 2x .1-x concentrations .3=(.1-x)/(2x)^2 1.2 x^2+x-.1=0 x= (-1+- sqrt (1+.48))/2.4 check that quadratic equation. x= (-1+sqrt(1.48))/2.4=.09 concentration of Cl2= 2x=.18moles/liter moles in one liter...
*Wednesday, February 29, 2012 at 10:11pm by bobpursley*

**Math**

1. |x+3|=4 x = 1, -7 2. |x-2|=6 x = 8, -4 3. |x-5|<3 x = ?? 4. |2x+3|>*17 x = ?? [>* means greater/less than OR equal to] Please check. And show how to do numbers 3 and 4. Thank you.
*Wednesday, November 4, 2009 at 8:19am by Maria*

**Math Inequalities**

4(r-7)+2>5(r+3)-28 I tend to make things too difficult.. can someone please check my answer? {r l r > 31/4}
*Thursday, November 5, 2009 at 5:45pm by Anna*

**Please check my maths answer?**

This is the question: The straight line y=2p+1 intersects the curve y= x+ (p^2/x) at two distinct points. Find the range of values of p. this is what i did: 2p +1 = x + p^2/x simplify.... x^2 + (2p+1)x + p^2 = 0 b^2-4ac > 0 (-2p-1)^2 - 4(p^2) > 0 simplify.... 4p + 1 >...
*Monday, June 15, 2009 at 10:17pm by Rikkie*

**Calculus (Check)**

This seems to easy. Check please. Find. Lim (x^2)-4 x->2 e I substitute in 2 (2^2)-4 e gives me 4-4 e So my answer is e^0 or 1.
*Friday, September 14, 2012 at 12:28pm by Greg*

**Chem- Please check :)**

I don't get it :S
*Wednesday, April 18, 2012 at 10:21pm by Anonymous*

**Chem II Oxidation Reduction**

Ok, here is my equation on this one. I2 -----> I^+1 + 1e- 4e- + I^+5 ----> I^+1 4(I2 ----> I^+1 +1e-) 4e- +I^5 ----> I^+1 on this problem, the e- balance, but when I start trying to balance the equation, I am not getting the same amount of I or Cl on each side. I ...
*Sunday, July 27, 2008 at 6:43pm by Ken*

**algebra - absolute value**

+(t-4) > t-4 0>0 , no solution or -(t-4) > t-4 -t+4 >t-4 -2t > -8 t < 4 check with some numbers t = 1 , which is less than 4 |1-4| > 1-4 3 > -3 , YUP t = -50 , which is less than 4 |-50-4| > -50 - 4 54 > -54 , YUP let t = 6 , which is greater than...
*Thursday, November 29, 2012 at 7:51pm by Reiny*

**Help Please! (URGENT)**

My previous post didn't post properly so heres a new one. Can someone please check my work? James:But were so good together, Susan:We were good together. Im sorry, but I think we should break up. James:(Silence) Susan:James? James:You think we should break up. (Sighs) I ...
*Sunday, September 20, 2009 at 2:54am by John*

**Chem**

cr(s)--->Cr^3(aq)+3e- and Pb2+(aq)+2e---->Pb(s) write a balanced equation Please help thanks
*Sunday, May 5, 2013 at 5:04pm by Jess*

**Calculus**

Find the limit. lim 5-x/(x^2-25) x-->5 Here is the work I have so far: lim 5-x/(x^2-25) = lim 5-x/(x-5)(x+5) x-->5 x-->5 lim (1/x+5) = lim 1/10 x-->5 x-->5 I just wanted to double check with someone and see if the answer is supposed to be positive or negative. ...
*Wednesday, January 22, 2014 at 1:20pm by S*

**Chem**

Which of the following produces a coordinate complex? H2SeO4 + 2Cl- + 2H+ --> H2SeO3 + Cl2 + H2O S8 + 8O2 --> 8SO2 3Br2 + 6OH- --> 5Br- + BrO3- + 3H2O Ca+2 + SO4-2 -->CaSO4 PtCl4 + 2Cl- --> PtCl6(-2)
*Tuesday, April 22, 2008 at 10:31pm by Trevor*

**Economics**

I am on the chapter for International Trade in the book. I neew to calculate the producer surplus after a trade and I am not sure if I am doing it right. Graph: Price of Pencil Sharpeners $16__________________________World Price >>>>>>>|>>>>>...
*Saturday, May 10, 2008 at 10:16am by G*

**FRENCH**

The 22 French regions Alsace >> Aquitaine >> Auvergne >> Bourgogne >> Bretagne >> Centre Val de Loire >> Champagne - Ardenne >> Corse >> Franche-Comtι >> Ile de France >> Languedoc - Roussillon >> Limousin >&...
*Monday, May 9, 2011 at 8:27pm by Frenchy*

**Chem help**

I have the answers for these but can you please explain to me how to get them? Thanks. Place the following in order of decreasing lattice energy. KBr RbI MgS a. KBr > RbI > MgS b. KBr > MgS > RbI c. RbI > KBr > MgS d. MgS > KBr > RbI e. MgS > RbI >...
*Wednesday, November 28, 2007 at 1:01pm by Sami*

**O-CHEM (PLEASE CHECK)**

answer for the first was "3"
*Sunday, February 24, 2008 at 8:11pm by K*

**Chem Check Please!!!**

This looks ok to me.
*Thursday, March 20, 2014 at 7:56pm by DrBob222*

**CHEm. help please**

Write the Keq expression for the reaction. For K to be >1, what must be true about the products vs reactants. The fraction must be >1, right. So that means the numerator must be larger than the denominator.
*Friday, November 19, 2010 at 8:30pm by DrBob222*

**Chem--PLEASE HELP 911**

A- 14H + 6Fe^2+ + Cr2O7^2- --> 6Fe^3+ + 2Cr ^3+ + 7H2O B- 3N2H4 +4Cl03- --> 6NO2+ 12Cl- + 6H2O This was all I was able to come up with, am I at lease headed in the right direction?
*Thursday, April 25, 2013 at 12:22pm by JO*

**pl. check question**

2x-5(x=3)>-20 does not look like a valid equation. Please check for typos in your post.
*Wednesday, August 25, 2010 at 10:08pm by MathMate*

**algebra**

please check my problem and make changes as needed. thanks solve ineqality: 3/7(2p-14) > 6/7p-6 Clear fractions mult. by 7/1 3(2p-14) >6p-6 6p - 42 > 6p - 6 6p - 6p -42> 6p - 6p - 6 0 -42 +42 > -6 +42 0 > 36
*Wednesday, February 8, 2012 at 9:13pm by ann*

**Abstract Algebra**

If 2^n>n^2 and n>5, then 2^n+1>(n+1)^2 Proof: Assuming that 2^n>n^2 then I can say that 2*2^2>2*n^2 = 2^n+1>2n^2 If I can show that 2n^2>(n+1)^2 then I will be done by transitivity. So 2n^2>(n+1)^2? then 2n^2>n^2+2n+1? then n^2>2n+1, hence n^2-2n-...
*Friday, September 21, 2007 at 2:00pm by Dina*

**CHEM (HELP PLS)**

Suggest the syntheses of putrescine and cadaverine from ethyl bromide I dont think I can use Grignard can I? PLEASE HELP. CH3CH2Br + CH3CH2Mg/EtoEt -> CH3Ch2Ch2Ch2MgBr + NaN3/EtOH -> CH3Ch2Ch2Ch2N=N=N + LiAlH4/H20 CH3Ch2Ch2Ch2NH2? Then what? does this even work?
*Saturday, April 30, 2011 at 4:41am by lauder*

**Honors Chemistry (check answers)**

On a worksheet we got, we have to balance out chemical reaction equations then define what kind of reaction it is (synthesis, decomposition, single/double-replacement). Would someone be willing to check my answers, please? Thanks!! 1. c) BaO + H2O ==> ________ (synthesis...
*Monday, October 26, 2009 at 10:16pm by Emily*

**BAA App. Essay Help! (please read!)**

My favorites activities >> favorite a club when we help the people, >> in which we help One my ideas is to help the >> was We come with an idea >>came up with an idea celebrate their thanksgiving >> Thanksgiving at my school donated we decorate &...
*Wednesday, December 5, 2012 at 9:03pm by Ms. Sue*

**Sabian **

If air resistance offered to the motion of a projectile by the surrounding air is taken in account i,is time of flight increase or decrease?why? ii,hmax >> >> >> iii,the range >> >> >> iv,the striking angle >> >> >>
*Tuesday, January 8, 2013 at 1:20am by Tsedeke*

**Chem help**

Calculate the frequency of the light emitted when an electron in a hydrogen atom makes each transitions.? n=4 => n=3 ? v = ________________ s^-1 n=5 => n=1 ? n=5 => n=4 ? n=6 => n=5 ? I got the first one correct (1.6*10^14) but the rest i am getting wrong. Can ...
*Tuesday, November 2, 2010 at 7:03pm by AMY F*

**Sceinece/Chem**

Mg3N2+6 H20 >>> 3Mg(OH)2 +2 NH3 Surely you can balance the second equation.
*Sunday, October 25, 2009 at 11:08am by bobpursley*

**Chem**

64----> 32---> 16----->8 1 2 3 There are 3 half life. Divide 42/3 = 14 days
*Wednesday, October 19, 2011 at 2:02pm by Robert*

**chem can u check answer please**

thanks so much
*Sunday, May 23, 2010 at 10:42pm by andy*

**Chem(Check Please)**

I responded above.
*Thursday, June 21, 2012 at 1:32am by DrBob222*

**Math>>>>if anyone could check my answer**

this problem is difficutl for me i have an answer but im unsure so if someone could check my answer please. heres my problem: A light year is the distance that a light travels through a vacuum (space without matter) in one year. A light year is about 9.46 x 10^12km. The ...
*Thursday, March 31, 2011 at 11:39pm by Angel*

**Pre-Calc**

divide numerator and denominator by t^3 C=(3/t^2 + 1/t^2)/(1+50/t^3) as t>>>very large, then C=(0/1)=0 which means the chem is gone.
*Wednesday, January 22, 2014 at 10:32pm by bobpursley*

**please check**

1)3/4+x>1 answer:x>1/4 2)10-3x<5 answer:x>5/3 3)|7-x|>2 answer:x>-5 x<-9 4)|x+0.5|=0.25 answer:x=-o.25,-0.75 thank you very very much!!!
*Wednesday, November 10, 2010 at 6:28pm by Math asap*

**check my answer please>>**

check my answer
*Monday, January 2, 2012 at 9:07pm by Chelsea*

**PHYSICS**

The masses and coordinates of four particles are as follows: 40 g, x = -4.0 cm, y = 5.0 cm; 30 g, x = 5, y = 0.0 cm; 40 g, x = 5.0 cm, y = 3.0 cm; 20 g, x = 3.0 cm, y = 2.0 cm. What are the rotational inertias of this collection about the (a) x, (b) y, and (c) z axes? >>...
*Thursday, March 22, 2007 at 5:15pm by wolfpak*

**Algebra**

Could you please check my answers and help with the ones I can't figure out- 1. Solution to the radical function sqrt(12x+1) = 1 is x = 0 True or False I think it is true according to my calculations 2.Solve x = sqrt(8x) 8x = x^2 x^2 - 8x = 0 x(x-8) = 0 x = 0 x-8 =0 x=8 the ...
*Tuesday, October 19, 2010 at 9:23am by JayLynne-Please check*

**algebra 2**

I am not sure if you have the right question. The absolute value of any function is greater than zero, so the condition >-6 is superfluous. Check if the question is not: x+4 > |6|. If the question is indeed |x+4|>6 and |x+4|>-6, just work with the first condition, ...
*Saturday, September 25, 2010 at 6:17pm by MathMate*

**Chem- Please check :)**

oh okay. make sense :) thank you so much!
*Wednesday, April 18, 2012 at 10:21pm by Anonymous*

**Chem**

Use the following reactions to arrange the elements A, B, C, and D in order of their redox activity, from greatest to least. 2 A + B2+ --> 2 A+ + B B + D2+--> B2+ + D A+ + C -->No reaction 2 C + B2+ --> 2 C+ + B Can someone explain? thanks
*Sunday, May 8, 2011 at 6:08pm by Rebekah*

**chem lab**

hi im doing a post lab sheet for chem class. and im having a little trouble. i have: temperature 12.6 C -> 285.6 K Time 816 sec but im supposed to find 1/T(K) it looks like my classmate did this: 12.6 x 285.6 = 3598.56 however they gave me the response to group 2 also: and ...
*Saturday, October 16, 2010 at 9:08am by chem*

**Pre-Cal.**

Describe the end behavior of f(x)=2x^4-5x+1: A. x-->, f(x)-->; x-->-, f(x)-->- B. x-->, f(x)-->; x-->-, f(x)--> C. x-->, f(x)-->-; x-->-, f(x)--> D. x-->, f(x)-->-; x-->-, f(x)-->-
*Tuesday, March 17, 2009 at 2:35pm by Mia*

**math**

Please check problem 3y - 2 > 12 - 5 y answer y > 7/4
*Wednesday, September 3, 2008 at 7:26pm by jay jay*

**chem**

Please check DrBob's answer below.
*Tuesday, November 27, 2007 at 6:02pm by Ms. Sue*

**chem - CHECK PLEASE BOB PURSLEY**

not ethelyne glycol?
*Saturday, May 24, 2008 at 4:50pm by Sarah H*

Pages: **1** | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>