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September 22, 2014

Posts by LT


Total # Posts: 131

SCIENCE
describe the preparation of 100mls of 1,0M from concentrated HCL?
April 11, 2012

English / Literature
Choose one archetype that is illustrated by two or more of the stories you have read, and write a brief essay explaining what an archetype is, what archetype you’ve chosen to discuss, and how the archetype is demonstrated in at least two different pieces of literature you...
June 23, 2011

Math
Sarah spends 2/5 of her monthly income on rent. Sarah's rent is $750. What is sarah's montly income? Write an equation to solve this problem.
November 17, 2010

Math
a long distance phone company charges $3 for a phone call plus $0.75 for each minute of the call. What fuction does this situation give rise to? Find the formula and make a table for this function.
November 17, 2010

Math
A candy bowl contained 723 candies. Some of the candies were red and the rest were green. There were twice as many green candies as red candies. How many red candies were in the candy bowl? Write an equation to solve this problem.
November 17, 2010

Math
Describe how this could happen that three different animals could each be claimed - rightfully - to be the largest of the three. Discuss the implications of this kind of situation for teaching students about measurement.
November 15, 2010

business
. Theory and origin of the separation of powers II. The division of powers among the branches of government A. The executive branch B. The legislative branch III. The separation of church and state IV. The judicial branch V. Current ideas about the separation of powers most ...
May 6, 2010

english
What does Thomas Paine value highly in the excerpt from his essay “The Crisis”? Freedom Solitude Individuality Spirituality Equality
September 30, 2009

MATH
x+y=-4 (x-2)^2+(y+7)^2=13 solve by substitution
May 12, 2009

MATH
The sum of the squares of two numbers is 2. The product of the two numbers is 1. Find the numbers. xy=1 x^2+y^2=2 x^4+1=2x^2 x^4-2x^2+1=0 I dont think you can factor that unless its (x^2+1)(x^2-1) but I dont know where to go from there
May 12, 2009

exercise
What specific recommendations would you give on fuel selections and hydration to successfully run a 10 K race
April 16, 2009

MATH
y = sin (x - Pi sign) amplitude: period: phase shift:
April 14, 2009

Math
How do I solve: log6 (x^2-5x) = 1 1/2log5(r-2)-log5 r) log2 (x-1/x^8) I really dont know how to do these or even start
March 16, 2009

Math
Solve the polynomial equation, to obtain the first root. x^3+7x^2+19x+13 and 2x^4-19x^3+74x^2-127x=0 I dont know how to start these, or finish them
March 3, 2009

Math
2 square root -50 + 5 square root -32 i got 30i square root 2 is this right
March 3, 2009

Math
x/x+3 > or equal 2 (-3,6] or [-6,-3) or does it have an infinity in the answer
March 3, 2009

Math
Solve the polynomial inequality x^2+5x >or= -6 (-infinity, -3]u [-2, infinity) or [-3,-2]
March 3, 2009

Math
Doesnt i^2 equal -1
March 1, 2009

Math
For the second one i got 1+3i is this correct
March 1, 2009

Math
How do I figure these 2 out. Find standard form a +bi (4 square root -9) ( -3 square root -5) x^2 -3x+4 evaluated for x=1+i
March 1, 2009

Math
Determine whether the function x^3+x^2-1 is even, odd or neither. I thought it was odd because it has one negative sign is this correct
February 22, 2009

Math
Find all values satisfying x f(x) 3x-1 g(x) x^2-5x+12 (f*g)(x) = 17
February 17, 2009

PE
Why is it important to know an accurate VO2 max value when prescribing exercise?
February 7, 2009

Math
is the answer 5 thats what i got
February 3, 2009

Math
(X+1)/2 = 4 - (X+2)/7
February 3, 2009

Math
(square root of x+7)-5 = x Only the x+7 is square rooted how do I find the solution set???
February 3, 2009

Reading
My teacher is asking me to "Create a two-part answer for the concepts below" what is a two part answer
January 25, 2009

Math
i dont have the height would i use 82 the slanted side
May 19, 2008

Math
how do i find the height of a triangle the base is 18 inches, the angled side is 82 inches and it is a right triangle
May 19, 2008

Math
66 ft/sec
May 18, 2008

Math
x = 6.7
May 18, 2008

Math
If the ratio of two pulleys, A and B is 4:3, and pulley B has a length of 13.5 inches, how long is pulley A? [a] inches how do i figure this
May 16, 2008

math
i dont get lateral area either
May 14, 2008

math
ok i found how to do the surface area but i still dont know what to use for the lateral area
May 14, 2008

Chemistry
man this sucks well hold on 2Fe3+ + Sn2+ --> 2Fe2+ + Sn4+ +0.62 V Sn2+ + I2 --> Sn4+ + 2I– +0.38 V i hope this is better
May 13, 2008

Chemistry
2Fe3+ + Sn2+ ¡ú 2Fe2+ + Sn4+ +0.62 V Sn2+ + I2 ¡ú Sn4+ + 2I¨C +0.38 V
May 13, 2008

Chemistry
For there reaction system involving the species in the table below, what conclusion is justified for standard state conditions? Standard Reduction Potentials E0 2Fe3+ + Sn2+ ¡ú 2Fe2+ + Sn4+ +0.62 V Sn2+ + I2 ¡ú Sn4+ + 2I¨C +0.38 V (A) I¨C ...
May 13, 2008

Chemistry
is an electrode through which (positive) electric current flows into a polarized electrical device
May 12, 2008

Chemistry
I know that the electrons float over to the cataod SO i think it would be C
May 12, 2008

Chemistry
In every electrolytic and galvanic (voltaic) cell the anode is that electrode (A) at which oxidation occurs. (B) which attracts cations. (C) at which electrons are supplied to the solution. (D) at which reduction occurs.
May 12, 2008

Chemistry
what do you mean by plated
May 12, 2008

Chemistry
During the electrolysis of an aqueous solution of CuSO4 with inert electrodes (A) the anode loses mass and the cathode gains mass. (B) the mass of the anode remains the same but the cathode gains mass. (C) the mass of the anode decreases but the mass of the cathode remains ...
May 12, 2008

Chemistry
Ni2+(aq) + 2e¨C ¡ú Ni(s) ¨C0.25 V Sn4+(aq) + 2e¨C ¡ú Sn2+(aq) +0.15 V Br2(l) + 2e¨C ¡ú 2Br¨C(aq) +1.07 V
May 12, 2008

Chemistry
I left out this with the problem Ni2+(aq) + 2e¨C ¡ú Ni(s) ¨C0.25 V Sn4+(aq) + 2e¨C ¡ú Sn2+(aq) +0.15 V Br2(l) + 2e¨C ¡ú 2Br¨C(aq) +1.07 V so it says: Which process represents a general method for the preparation of a ...
May 12, 2008

Chemistry
Which process represents a general method for the preparation of a metal from its compounds? . (A) neutralization (D) fusion (B) reduction (E) sublimation (C) oxidation
May 12, 2008

Chemistry
well it cant be A or C so i think that it would be B
May 12, 2008

Chemistry
never mind that wouldnt be right i was looking at the wrong thing
May 12, 2008

Chemistry
would it be A because it is going from Zn to Zn^+2
May 12, 2008

Chemistry
Which statement is true for the cell as it discharges? Zn | Zn2+(1 .0 M) || Sn2+(1.0 M) | Sn (A) Oxidation occurs at the tin electrode. (B) Electrons will flow from the tin electrode to the zinc electrode. (C) The concentration of Zn2+ will increase. (D) The mass of the tin ...
May 12, 2008

Chemistry
Which reaction will occur if each substance is in its standard state? (A) Ni2+ will oxidize Sn2+ to give Sn4+ (B) Sn4+ will oxidize Br– to give Br2 (C) Br2 will oxidize Ni(s) to give Ni2+ (D) Ni2+ will oxidize Br2 to give Br–
May 12, 2008

Chemistry
Then A because its going from 0 to +2
May 12, 2008

Chemistry
is the answer C
May 12, 2008

Chemistry
In the chemical reaction, . Zn(s) + CuSO4(aq) ¨ ZnSO4(aq) + Cu(s), (A) metallic zinc is the reducing agent. (B) metallic zinc in reduced. (C) copper ion is oxidized. (D) sulfate ion is the oxidizing agent.
May 12, 2008

Chemistry
well then the question asks later on what the theoretical explanation would be so you choose A or D could the theoretical explanation be one of those and then the experimental be the other
May 12, 2008

Chemistry
Free sulfur may act as either an oxidizing agent or a reducing agent. What is the best experimental evidence for this statement? (A) Sulfur forms sulfur dioxide as well as calcium sulfide. (B) Sulfur is a nonmetal. (C) Sulfur forms both organic and inorganic compounds. (D) ...
May 12, 2008

Chemistry
Manganese has the oxidation number of +5 in ______ . . (A) [MnF6]3– (C) [MnO4]2– (B) Mn2O7 (D) [Mn(CN)6]–
May 12, 2008

Anthropology
Create at least two arguments each pro- and contra the establishment of a Global Culture does any one know about global culture or what it is
May 7, 2008

Dr. Bob Chemistry question
1.136/.2068=5.5 .5976/.2068= 2.88 so 3 .2068/.2068 = 1 .3923/.2068 = 1.89 so 2 now do i do it to all four with different denominators like 1.136/1.136= 1 .5976/1.136 = and so on or do i do it by just that one
May 5, 2008

Dr. Bob Chemistry question
ok i did all the mols of those numbers and came out with H2O = (20.51/18.051)=1.136 C2O4 = (52.60/88.016)=.5976 Fe 3+ = (11.55/55.845)= .2068 K + = (15.34/39.098)=.3923 Ive gotten that far... now im a little confused on how you do the rest of the question because they dont ...
May 5, 2008

Dr. Bob Chemistry question
Ok this is what i got for the grams part now.... Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18 %H2O = (20.14/98.18)*100 = 20.51% %C2O4 = (51.64/98.18)*100 = 52.60% % Fe 3+ = (11.34/98.15) * 100= 11.55% % K + = (15.06/98.15) * 100 = 15.43 % 20.51 g H2O, 52.60 g C2O4 11.55...
May 5, 2008

Chemistry
How do i write a good discussion/conclusion for a lab report.
May 4, 2008

Chemisty
Ok this is what i got for the grams part now.... Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18 %H2O = (20.14/98.18)*100 = 20.51% %C2O4 = (51.64/98.18)*100 = 52.60% % Fe 3+ = (11.34/98.15) * 100= 11.55% % K + = (15.06/98.15) * 100 = 15.43 % 20.51 g H2O, 52.60 g C2O4 11.55...
May 4, 2008

Chemistry
Dr. Bob ok well here is what i have gotten so far: on the problem H2O: 1.118 mol C2O4: .58681 mol Fe 3+: .2025 mol K^+: .3862 mol That is what ive gotten doing 20.14 g(1 mol / 18 g) = 1.118 mol and so on with the rest of them Did i do that wrong
May 4, 2008

Chemistry
ok well here is what i have gotten so far: H2O: 1.118 mol C2O4: .58681 mol Fe 3+: .2025 mol K^+: .3862 mol That is what ive gotten doing 20.14 g(1 mol / 18 g) = 1.118 mol and so on with the rest of them Did i do that wrong
May 4, 2008

Chemistry
How do I find the percent composition of H2O: 20.14grams C2O4: 51.64grams Fe 3+: 11.34grams K^+: 15.06 grams and the empirical formula with these numbers
May 4, 2008

Anthropology
what is an Incipient Civilizations
April 24, 2008

Question for a Teacher
well are you dr. bob can i ask you some questions... kinda like an interview
April 22, 2008

Question for a Teacher
Are any of you a teacher... I have an important question that has to a teacher
April 22, 2008

Chemistry
Enough water is added to 0.35 g of benzoic acid to make 1000 mL of solution. What is the pH? Ionization Constant for Benzoic Acid Ka = 6.5 × 10–5 Molar Mass Benzoic Acid 122. g·mol–1 (A) 1.9 (B) 2.6 (C) 3.4 (D) 4.2
April 15, 2008

Chemistry
What is the molar concentration of silver ion in a solution containing 1.3 × 10–4 M CrO42–, saturated with Ag2CrO4? The Solubility Product Constant, Ksp for Ag2CrO4 is 9 × 10–12 (A) 1.3 × 10–16 (B) 7 × 10–16 (C) 9 × 10&#...
April 15, 2008

Chemistry
The ionization constant of an acid, HX is 1 x 10^-5. When a mixture of 0.100 mol HXand 0.100 mol of NaX is diluted to a volume of one liter by addition of wate, the pH of the resulting solution is very nearly a. 7 b. 6 c. 5 d. 4
April 15, 2008

Chemistry
BaSO4 less soluble so answer D
April 14, 2008

Chemistry
Equal volumes of 1 M BaCl2 and 1 M NaSO4 are mixed. What effect will the addition of more Na2SO4 solution have on the concentration of Ba^2+ remaining in solution? *No effect *increase the concentration of Ba^2+ ions *Decreases the concentration of Ba^2+ *Ba^2+ will remain the...
April 14, 2008

Chemistry
Which one of the following salts is obtained by the reation of a weak acid with a strong base. MgCl2 NH4F LiClO4 NaCl K2SO3
April 14, 2008

Chemistry
All of the following species would be expected to be able to function a Lewis bases EXCEPT a. F- b. O2- c. OH+ d. H2O BF3
April 14, 2008

Chemistry
How do you calculate the pH, pOH, [H3O] and [OH] for a 0.067 M solution of sodium iodate
April 14, 2008

Chemistry
What is the OH^- concentraton of a solution that is 0.10M in Na2C2O4? I have a couple of these concentration questions asking different things but I dont know how to do them
April 14, 2008

Chemistry
I got the pH how do i turn that into (H+)
April 14, 2008

Chemistry
constant sorry :(
April 14, 2008

Chemistry
The dissociation for a weak base BOH in water found to be 1.25 x 10^-6. What is the concentration of H+ in a 3.2M soluton of BOH.
April 14, 2008

Chemistry
well C says AX is less than BX2 and it is so i thought it would be that one.
April 14, 2008

Chemistry
If two salts AX and BX2, have the same Ksp values of 4.0x10^-12 at a given temperature, then A. their molar solubilities in water are the same B. the salts are more soluble in 0.1 M NaX than in water C. the molar solubility of AX in water is less than that of BX2 D. addition ...
April 14, 2008

Chemistry
that makes better sense now thank you
April 14, 2008

Chemistry
well i do understand what you did to solve the problem... and i did find the answer... its just that all this stuff im looking at is sqrt everything thats all and i didnt see you do that
April 14, 2008

Chemistry
where i am pulling this is if you pull up google and type in molar solubility the first website shows you how to do it... that is what i am following and it shows me that in the book too
April 14, 2008

Chemistry
Ksp = 4.0E-5 = (x)(3x) is the (3x) squared ??
April 14, 2008

Chemistry
If the concentration of a saturated solution of SrCO3 is 0.000040 mol*L^-1, what is the value for the solubility product constant of this salt. How do I start this please
April 14, 2008

Chemistry
i subtracted 1E-3 from the 1.8E-8 and it got me a -9.999E-4 then i took the sqrt cause (X)(X) is x^2 and then the calculator told me an error
April 14, 2008

Chemistry
ok I got x^2 = 1.8 x 10^-8 = 1.34 x 10^-4 for PbSO4 is this right
April 14, 2008

Chemistry
So im solving for two expressions... is that it.
April 14, 2008

Chemistry
So what do i do then to solve for the ksp
April 14, 2008

Chemistry
what is the molar solubility of lead sulfate in 1.0 X 10^-3 M Na2SO4? The Solubility Product Constant PbSO4 Ksp= 1.8 x 10^-8 The Ksp expression is: Na2SO4 = [2Na][SO4^-2] [2Na]=2x [SO4^-2]=x Ksp= 1.8 x 10^-8 = (x)(2x) Ksp= 1.8 x 10^-8 /4x^3 1.8 x 10^-8/4 = x^3 4.5 x 10^-9 = x^...
April 14, 2008

Chemistry
I follow you so far but how do you calculate OH
April 10, 2008

Chemistry
a solution saturated in calcium hydroxide(limewater) has a pH of 12.35. What is Ksp for calcium hydroxide? How do i start this problem. please
April 10, 2008

Chemistry
The pH of a 1.0 x 10^-3 M Ba(OH)2 solution at 25 degrees C is how can 11.3 be the right answer.
April 2, 2008

Chemistry
What is the pH of a buffer solution that is 0.20M methylamine and 0.15 M methylammonium chloride. which do i get the pH of
April 2, 2008

Chemistry
i think i will choose the 4.88 thank you
April 1, 2008

Chemistry
well the only problem im having is finding the pKa
April 1, 2008

Chemistry
What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate? How do I start this problem
April 1, 2008

Writing Assignment
I have to write a short essay on a movie called the seventh seal and I was wondering about a certain part that interested me and that would be where he is playing chess with death can any one give me some help with this... like what does it mean... and ect to it why does he ...
February 24, 2008

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