Wednesday
July 23, 2014

Posts by L.Bianchessi


Total # Posts: 104

Physio help please
If trypsin and chymotrypsin become activated within the pancreas and then are released in their active forms into the bloodstream, why would this represent a potentially life-threatening situation?

Help please..Physio!!:0
If trypsin and chymotrypsin become activated within the pancreas and then are released in their active forms into the bloodstream, why would this represent a potentially life-threatening situation?

Vessels..Logical question??
figured it out. but need help on my other question please!:)

Vessels..Logical question??
A classmate who has been standing still for several hours working on a laboratory experiment suddenly faints. Based on what was studied in this unit, what is the probable explanation?

I absolutely need help!!Math:/
oh, okay that makes sense its like a conversion factor. Thank you!

I absolutely need help!!Math:/
One liter of arterial blood at sea level contains approximately 3 mL of dissolved oxygen and 197 mL of oxygen bound to hemoglobin. If a normal individual has a cardiac output at rest of 5 liters per minute, how much oxygen is carried to the tissues per minute? If the same indi...

Chemistry
Calculate the percent ionizationof a 0.15 M benzoic acid solution in pure water Nd also in a solution containing 0.10M sodium benzoate. Why does the percent ionization differ significantly in the two solutions?

Pre-Calculus Help, thanks:)
Find the domain of f(x) = 1/ (square root 2x^2-7x-15) I tried setting 2x^2-7x-15 greater or equal to zero but I don't know where to go from there to solve for my domain. Help please!:)

Pre-Calculus
Find the maximum value, and where it occurs for eAch function. G(x)= (square root -x^2+4x+12)

Pre-Calculus
A town has a population which is growing linearly. In 1970 its population was 36,000 while in 1985 its population was 63,000. Find a formula for its population P(t), where t=0 corresponds to the year 1970.

precalc!!!!!
The point (5,-2) lies on the graph of y=f(x), and assume f^-1(x) exists. Find the corresponding point on eAch graph. A). Y=f^-1(x) I get (-5,2) B). Y=-f^-1(-x)+4 I get (5,2) C). Y=f^-1(x+2)+3 I get (-7,5) Did I get these right?

precalc!!!!!
The point (5,-2) lies on the graph of y=f(x), and assume f^-1(x) exists. Find the corresponding point on eAch graph. A). Y=f^-1(x) I get (-5,2) B). Y=-f^-1(-x)+4 I get (5,2) C). Y=f^-1(x+2)+3 I get (-7,5) Did I get these right?

precalc!!!!!
The point (5,-2) lies on the graph of y=f(x), and assume f^-1(x) exists. Find the corresponding point on eAch graph. A). Y=f^-1(x) I get (-5,2) B). Y=-f^-1(-x)+4 I get (5,2) C). Y=f^-1(x+2)+3 I get (-7,5) Did I get these right?

precalc!!!!!
find the point on the line y=2x-1 which is closest to the point (2,-1). I used distAnce formula and got D= (square root 5x^2 -4x +4) I did.... D=square root (2-x)^2 + (-1-(2x-1))^2 What do I do now?

Chemistry(Thank you for your help!)
Average rate of disappearance just means slope! So... (0.535-0.268)M / 0-520sec =5.13 X 10^-4Ms^-1 Tada!

MaTH!!!
Let P(x,y) be a point on the curve y=16-x^2 and let A be the point directly below P on the x axis. If O is the origin, find the area and the perimeter of triangle OAP as functions of x. I got Area=x(8-1/2x^2). Is that right? And perimeter= x+16-x^2+ (square root 256-30x^2) Did...

Chemistry
find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?

Chemistry
find the ph of 0.100M NaC2H3O2 solution. do i just write an equation and solve for x NaC2H3O2 +H2O= Na2O + HC2H3O2- 0.100 0 0 so x^2/0.100-x =1.8 X10^-5 x=1.3X10^-3 then do ph=-log(1.3X10-3) ph=2.9 is this right?

Chemistry
A 0.035 M solution of a weak base has a pH of 10.88. What is the Kb for the acid? Where Di I even begun**???

CHEMISTRY!!!!
Write two reactions for NaHCO3, reacting with water in one NaHCO3 is acting as acid the other as a base. Is 0.10M solution going to be acidic or basic? Explain. I write the two rxns but what do I do with then...

math
160Angstrom

precalc!!!!!
Let f(x)=3x-4x^2 Find f o f o f So... F(f(x)) I got a really big answer..... I think I might have done something wrong when doing the distributing algebraic work.

precalc!!!!!
Let f(x)=3x-4x^2 Find f o f o f So... F(f(x)) I got a really big answer..... I think I might have done something wrong when doing the distributing algebraic work.

Chemistry
You could probably set up a proportion. so.... 0.160/x= 0.205/1.5ppm Solve for x.

Maths
S=5

chemistry
Cr+3, Na+, I2, F2 Oxidized- lose electrons

Geometry
Volume =length x width x height You just multiply all three numbers to get what ever number m^3.

Chemistry
Well since sulfuric acid is a strong acid it dissociate completely so you just do the -log(0.10) =pH

ALGEBRA
Example--Difference of squares: (x^2 + 5x-6) = (x+6)(x-1) 1. Write an x in both parenthesis 2. Find factors of 6. (6x1 or 3x2) 3. The inner (6x) plus the outer (-1x) should equal the middle term 5x Or you could foil. Trinomial: (a+b)(a^2-ab+b^2) (a-b)(a^2+ab+b^2) Something lik...

math
285 miles to travel between two cities

math
2cm.... 2cm x 4cm x3cm=24cm^3

Chemistry(Please check, thank you!!)
The ice bath one would take longer because it takes more energy for the solution in the flask to form products thus, the activation energy is higher making the reactants need energy so it is endothermic.

Chemistry(Please check, thank you!!)
That's true but you should include how the temperature affected the rate and which way the equilibrium shifted and how the color change tells you which way it shifted. When you heat the test tube the solution turned a dark purple/blue color. And when you take the test give...

Math
Well 1min =60 sec ... So 60 sec +25 sec= 85sec

chemistry
No it would not. You convert 536.8 g to ml by using the density. You get 753 so no you cannot fit it into a 750 ml flask.

Math
Well if your cheap calculator has a exponent. You could do 2.72^-4.7 You get 0.0090683057 It's pretty close!

Algebra helpp i am going to fail
Well you use the area of a square formula. Do. You do (3x+2)^2=Area Get it?

Math pleez help
Is the 5 an exponent?

math/cal/trig solve for t
Cos inverse of 1/4 =2t So do cos inverse of 1/4=75.52... So... 75.52...= 2t Solve for t. T=37.76..

Chemistry
Determine whether each cation is acidic or pH neutral. For those cations that are acidic, write an equation that shows how the cation acts as an acid. A) Sr+2 B) Mn+3 C) C5H5NH+ D) Li+

Chemistry
Determine whether each cation is acidic or pH neutral. For those cations that are acidic, write an equation that shows how the cation acts as an acid. A) Sr+2 B) Mn+3 C) C5H5NH+ D) Li+

trig
Answer: (square root 1-25x^2 )/ 5x

trig
Is it set equal to anything?

Chemistry
Determine whether each cation is acidic or pH neutral. For those cations that are acidic, write an equation that shows how the cation acts as an acid. A) Sr+2 B) Mn+3 C) C5H5NH+ D) Li+

Chemistry
Determine whether each anion is basic or neutral. For those that are basic, wrote an equation that shows how an anion acts as a base. (A) C7H5O2 ^- (B) I^- (C) NO3^- (D) F^-

Chemistry
Well... You know that KOH is a strong base... So it ionizes completely. KOH----> K+ +OH- So you need the molarity of KOH... So.. 1.100g/.5500 L x 1mol/56.11g KOH = 0.0356 M KOH So since KOH is strong... Concentration KOH, K+, and OH- = 0.0356M pOH=-log(0.0356) pOH= 1.45 pOH...

Finance
The cost equity. Because... Cost debt+ cost equity= WACC

maths
Well you subtract the 16 to get your equation equal to one. Do x^2/16 + y^2/4=1 Your center is 0,0 Your eclipse would be horizontal. Do when graphing put a point at (0,0) then go 4 spaces in the negative and positive direction on the x-axis. Then go up 2 spaces from (0,0) in t...

maths
Well we can graph the points and form a triangle. We can then find the distance between each point(side). And if two sides have the same distance we know that the triangle is isosceles. Distance between AC: D=square root of (5-0)^2 +(2-1)^2 D=radical 26 distance between AB: D=...

Chemistry
Find the pH of each mixture of acids. 0.020 M HBr and 0.015 M HClO4. They are both strong acids Si they dissociate completely. Si do I just add 0.020 and 0.015 and take the -log of that concentration to get the pH? Like thus.... 0.020+0.015=0.035 pH=-log(0.035) pH=1.46 Would t...

Algebra
Do you mean ax^2+ bx+c=0 ??

Chemistry
Find the pH of each mixture of acids. 0.115 M HBr and O.125 M HCHO2. I TRIED DOING THIS PROBLEM THE SAME WAY AS THE ONE BEFORE BUT IT DIDNT WORK. THE PH SHOULD BE 0.939. I did HBr as stronger acid and got concentration of H+ and put it into the ka expression for formic acid an...

chemistry
The acid on the left has a conjugate base on the right. H20 is acting as base, and H3O+ conjugate acid. It's pretty much the opposite.

chemistry
You would add H2O to the acid and determine the products from a double reaction. The acid who gives the H+ up is the acid and the one who accepts it is the base. You look over at the products and those are called the conjugates. Do for example... 1) HSO4- + H2O --> H3O+ + S...

chemistry
You would need the chemical formula for plant food to see what it produces as products.

chemistry
Na+4 doesn't exist because sodium can only give away one electron because that's all it has. But maybe you are trying to say... Na3PO4---> 3Na^+ + PO4^-3

Chemistry
you would do a conversion factor. 50g of H2SO4 x 1mol sulfuric acid/ molar mass of sulfuric acid x grams of H2/ 1mol H2 You get grams of H2. Get it?

Math/Trig
YOU COULD SEE THE GRAPH BY GOING TO GOOGLE AND ENTERING IN WOLFRAM ALPHA A WEBSITE AND ENTER IN THE EQUATION. THEY USUALLY WILL GRAPH IT FOR YOU BUT YOU NEED TO DETERMINE THE PERIOD, AND ETC. STUFF FOR YOUR GRAPH.

Math/Trig
WELL FOR SIN AND AND CSC YOU KNOW THAT THE INTERVAL HAS TO BE BETWEEN 0<X<2PI SO YOU CAN FOR (B) 0<X-PI/2< 2PI AND THEN SOLVE FOR X. TO SEE WHERE THE GRAPH WILL LIE BETWEEN YOU GET PI/2<X<5PI/2 FOR TAN AND COT YOU KNOW INTERVAL IS PI/2<X<PI/2. FOR COS A...

Chemistry
So you get 0.01304 mol HCL. YOU GET 0.483GRAMS OF CALCIUM HYDROXIDE.

Chemistry
Determine your moles of HCl. Then use your equation to convert moles of HCl to moles of Ca(OH)2 then to grams of the calcium hydroxide. The ratio would be 2Mol HCL to 1mol of Ca(OH)2

Chemistry
Oh okay yeah I didn't add the 5.77x10^-3 to the weaker acid. So I determine concentration of stronger acid then put that H concentration into the weaker acid then I determine the concentration of the H of CH3COOH and get 7.02x10^-4 and add the H+ concentration of 5.77x10^-...

Chemistry
Find the pH of mixture of acids. 0.185 M in HCHO2 and 0.225 M in HC2H3O2 Im using an ice chart of weak acid and putting in strong acid in H+ initiAL concentration. I've done the problems many different ways but cannot seem to get the right answer help please?Answer is pH o...

Maths
I plugged in 3x-72=___ (set them equal to 420,660,780,1020) Answer:44,124,164,244,284 degrees

Maths
44&124degrees

Maths
Well I haven't done trig in a long time but u believe... You divide the 2 to each side to get Cos(3x-72)=1/2 Then do the inverse to both sides to get rid of the cos and end with 3x-72=60 degrees So x= 44 degrees Cosine is positive in quad1&4 So 44degrees and 316degrees.

college algebra
Oh and the answer would be y=-1/5x

college algebra
Oh, you just divide the negative to each side and get y=5x-2. Then use y-y1=m(x-x1) y-(-2)=-1/5(x-10) Then solve.

college algebra
Solve for y for the given equations. Putting it in y=mx+b form. Then do the negative reciprocal of the slope from the given equation. After that use the point slope formula to calculate the new equation using the given point and your new slope. Do you get it?

Chemistry
I got concentration of HCOOH rxn to be 5.77X10^-3. And the CH3COOH rxn to have concentration of 2.01X10^-3. I added those together to get 7.78X10-3. What do you mean add to ka expression? I keep getting 1.35 now.

Chemistry
It you cannot determine the concentration of the mixture by forming a double replacement became you form products that are the same as the reacting because you are mixing two acids.

Chemistry
Find the pH of mixture of acids. 0.185 M in HCHO2 and 0.225 M in HC2H3O2 Im using an ice chart of weak acid and putting in strong acid in H+ initiAL concentration. I've done the problems many different ways but cannot seem to get the right answer help please? Answer is pH ...

Chemistry
Oh, okay so increasing the kw makes the reaction produce more OH- and H+ so energy must be increasing on the reacting side to produce a endothermic reaction meaning energy is being absorbed to obtain a high temperature for the kw. Ahh...I get it! Thank you!

Chemistry
Oh, okay so increasing the kw makes the reaction produce more OH- and H+ so energy must be increasing on the reacting side to produce a endothermic reaction meaning energy is being absorbed to obtain a high temperature for the kw. Ahh...I get it! Thank you!

Chemistry
The value of Kw increases with increasing temperature. Is the autoionization of water endothermic or exothermic? In thinking its both but I don't know how to explain it.hmm...

Chemistry
Yes.

Chemistry
I just wrote mine in terms of the concentration of the thiosulfate. Pretty much I isolated the variable I was trying to find. :) same thing though!

Chemistry
Yes, exactly! Since we are diluting we can use M1V1=M2V2. So Concentration of thiosulfate X Amt.(volume) of added thiosulfate = (75ml)total volume X the Concentration of the new concentration of thiosulfate in the flask(what you are trying to find) The thiosulfate concentratio...

Chemistry
I did this same experiment a couple weeks ago. We are measuring the amount of time it takes for the thiosulfate to run out. So to calculate the concentration of the thiosulfate ion. You can multiply the milliliters of thiosulfate in whatever trail you are calculating it for by...

chem sig figs
How many significant figures are in 0.0? And how about 0.00?

math
Each person can stand 4 different ways I believe So I'm thinking 16 different ways all together.

math
use permutations and combinations on these types of problems.

Chemistry
I think I made a mistake.... 1.35g/100g solution=0.0135grams 0.0135g/1.01g=0.01337ml Then... 1.35g/46.03g CH2O2= 0.0293mols Then... 0.0293mol/ 1.337X10^-5 = 2.19X10^3 M pH= -log[H+] PH=-log(2.19X10^3) But I get a negative ph.

Chemistry
This is probably easier then my making it but... Calculate the ph of a forming acid solution that contains 1.35% forming acid by mass. Assume a density of 1.01g/ml for the solution.

chemistryhelp
Usually the salt is contained in what they refer to as a salt bridge. Connecting the electrodes of the experimented ions.

Chemistry 101
Delta T= (95Joules) / [ (16g Au) X (0.128 J/g C)] Change of temp= 46Degree celcius

general chem
A burning log, light from flashlight, car in motion, are examples of what type of energy? 1)potential 2)thermal 3)kinetic 4)radiation

Chemistry
According to the second law of thermodynmics..a) cold moves to hot B) low pressure moves to high pressure C) wet moves to dry D) dry moves to wet

Chemistry
I'm thinking c,b,a?

Chemistry
Ranking equilibrium constants from largest to smallest according to an image?Ethene (C2H4) can be halogenated by the following reaction: C2H4 (g) + X2 (g) -><- C2H4X2 (g) where X2 can be Cl2 (green), Br2 (brown), or I2 (purple). Examine the three figures below representi...

Chemistry
A chemist trying to synthesize a particular compound attempts two different synthesis reactions. The equilibrium constants for the two reactions are 23.3 and 2.2 X 10^4 at room temp. However, after 15minutes the chemist finds that the reaction with the smaller equilibrium cons...

algebra
8less than or equal to x less than or equal to 15

maths
15 I believe

algebra
Find the slope. (3,1/3) and (3+h, 1/(3+h)) I think I get -1/ 3(3+h) ???

precalc
I got that same interval notation. Except I subtracted the 4/x^3 to the other side and ended up with (x+2)(x-2)/x^3 less than or equal to 0. Then I drew one of those. Line grAphs Nd put circles at -2,2, and an undefined at 0. Then figured out where the x's are negative. Wo...

ChemB
How do you know what number goes on the top and bottom for the disintegration?

ChemB
Oh, okay. Do I always use that equation for any order rxn involving time? How about the units, would it be yrs^-1 or just years?

ChemB
The activity of carbon 14 in living tissue is 15.3 disintegrations per minute per gram of carbon. The limit for reliable determination of age is based on carbon 14 is .10 disintegration per min per gram of carbon. Calculate the max age of a sample that can be dated accurately ...

algebra
Solve for y. y-(-5)=-3(x-(-2)) So y+5=-3x-6 Y=-3x-11 Basically you are now in Y=mx+b form

algebra
You use the point slope equation. I believe it is.... y-y1=m(x-x1)

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