Monday

April 21, 2014

April 21, 2014

Total # Posts: 227

**math**

thank you very much :)

**math**

i already asked this question for how to divide (x^2 +2x) / 2x-1 i need to find the quoyient not how to simplify it. I need to use the quotient in order to graph an oblique asymptote. can it not be divided?

**math**

sio i cant find the quotient of it? I need to find the qoutient so that i can find the oblique asymptote so i can graph the function.

**math**

how would i do (x^2 + 2x) / (2x-1) thanks

**math**

ummmm you cant post yr whole homework assignment on here....

**math URGENT**

those wierd things were supposed to be square roots btw

**math URGENT**

okay i need to find the domain and range of this z(x) = ãx^2 - 100 (everything is in the square root) so i think i found the domain i got [-10,10] but i dont know about the range i solved for x and got stuck here x=ãy^2 + 100 helppp pleaseee :)

**math**

Can you give me one of your problems? I can explain it better if you do :)

**writing**

First a paragraph should be 4-5 sentences. Try breaking up your ideas and adding details. For exapmle, when you say you and your family got on a plane to Seattle, tell about what time you left, what it was like, how long it took, or any other detail. Do the same for your other...

**microbio**

how large are bacteria? what are the requirements for autoclaving bacteria

**4th grade**

44

**math**

never mind i got it

**math**

what would the graph of this look like xy<0

**microbiology**

what is the common-source outbreak of the H1N1 flu of 2009

**microbiology**

Where and what is patient zero in the H1N1 infection? Use this info to discuss primary infections vs. secondary infections i can figure out the second part if anyone can tell me the first part thanks :)

**math**

haha okayy thankss

**math**

haha okayy thankss

**math**

ok this is kinda stupid but i totally just confused myself with the simplest thing haha okay when doing the FOIL methed to this equation (-7-y)(-7-y) would it be 49 + 7y + 7y + y^2 or no??

**Crossword**

okay :)

**Crossword**

perhaps Derby?

**Crossword**

do you have a textbook or something to look these up? answers are usually bolded words :)

**Crossword**

yepp :)

**Crossword**

titus oates maybe? so just oates

**science**

thanks

**science**

are most petri dishes the same size? if so what would the diameter of one be? i need to find the surface area of a petri dish

**..**

are most petri dishes the same size? if so what would the diameter of one be? i need to find the surface area of a petri dish

**math**

yeaa thank youu!!

**math**

im solving nonlinear equations they are y = x^2 y - 2 = x so i plugged in the x^2 to get x^2 - x = 2 then i factored out an x to get x(x-1) = 2 now what would i do?

**microscopes**

When using a light microscope to look att two hairs crossed over each other... Under low power were both hairs in focus at the same time? What about medium power? What does this tell you about the depth of field as you increase magnification. The answer to the focus part is no...

**Microbiology**

i mean numerator

**Microbiology**

what is the best resolution of our light microscopes the formula should be RP = wavelength/2NA right?? so my question is which wavelength do i put as the denominator

**microbiology**

List 6 uses of microbes both by humans and in mother nature

**chemistry**

mole can be abreviated as mol right??

**Geometry Math**

from what i can remember when i took geometry i think that you use the distance formula i believe it is d = *square root of* (x2-x1)^2 + (y2-y1)^2 just plug in the numbers for example 4 would be x1 and -6 would be x2

**chem**

if you were to react 14.00 grams of salicylic acid with 8.50 grams of acetic anhydride, what would your theoretical yield be? the reaction is C7H6O3+C4H6O3--> C9H8O4 + C2H4O2 assuming 1:1 ratio.

**chem**

what VSEPR "shapes" and bond angles do you find Toluene

**chem**

how many grams of a precipitate will form when you mix 45 ml of a 3.5M silver nitrate solution with 45 ml of a 5.4 M magnesium chloride solution i sorted the problem but have no clue how to start

**anonymous**

what atoms usually form coordinate covalent bonds i couldnt find this anywhere also i just want to make sure is the electronegativity difference range for polar covalent bonds .4 - 2.1 paulings?

**chemistry**

how many atoms of tungsten are in 504.56 g of tungsten(IV)acetate. i attempted this problem but ended up with atoms of tungsten(IV) acetate in tungsten(IV) acetate instead of atoms of just tungsten in tungsten(IV) acetate. please help thanks

**chemistry**

list three ions that are iso-electric with potassium +1 please explain i have no clue

**chemistry**

what ionic compounds could you form from the following? Sodium Calcium Neon Phosphorus Chlorine i have NaCl, CaCl2, Na3P, and Ca3P2 is that all and can neon be used?

**chemistry**

my last question is how do you determine the molecular formula of a covalent compound given its formula?

**chemistry**

my teacher told me that polar bonds have a difference in elecronegativities of .4-2.1 is that the only way to find if a bond is polar? also how would you find out if the MOLECULE is polar or not? - i think i remember my teacher saying something about dipole moments...

**chemistry**

what are structural formulas?? also is this correct hybridization is the setting aside of p orbitals in order to form bonds (pi bonds)

**chemistry**

thank you so much

**chemistry**

how would you determine the % of ionic/covalent char. in the bond? this is on my test review and dont remember learning it

**chemistry**

and try answering mine please =)

**chemistry**

do you know the rules? 1. 4 + 6(4) = 28 valence electrons 2. 8(5) = 40 electrons wanted 3. 40 - 28 = 12 shared electrons 4. 12 / 2 = 6 bonds 5. 28 - 12 = 16 electrons not in bonds 6. 16 / 2 = 8 lone pairs create the structure from this and yes 6 bonds means 2 double bonds are ...

**history**

would Germany signing the armistice be a good one?

**history**

I have to write an essay on the role Germany had in World War 1 between 1914 and 1920. I need to have three key points but I can only think of one. So far i have a paragraph about how Germany attacked the Lusitania and killed innocent civilians. -would this be a good idea? Als...

**chemistry**

i believe it stands for quantum mechanical model. i guess my teacher shortened it but she just describes it as the flower model.

**chemistry**

I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C atoms form a triple bond and the Cl atoms form single bonds. Cl | C'triple bond'C | Cl Therefore i think that the central C atom hybridizes into sp. if this is correct, my question is how d...

**DRBOB**

help with below questions please and thank you

**chemistry**

why is COCl2 polar a. different electronegativities b. nonsymmetric c. tetrahedral d. symmetric e. trigonal planar more than one can be chosen also wht is HCN polar a. nonsymmetric b. different electronegativities c. trigonal planar d. linear e. bent f. symmetric thanks i alre...

**chemistry**

I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C ayoms form a triple bond and the Cl atoms form single bonds. Therefore i think that the central C atom hybridizes into sp. if this is correct, my question is how do i know which p orbital on C to f...

**chemistry**

How do multiple bonds introduce rigidity into molecules? what is meant by rigidity??

**chemistry**

what is the duet rule?

**Chemistry**

yes you are correct for both questions if it is not stated that it is [H+] or [OH-] then you should ask your teacher

**Chemistry**

Since you have the cooefficient of 6 before HCl, you must have 6 Cl atoms on the other side as well. AlCl3 already has 3 Cl atoms so if you put a 2 as the coefficient that gives you 6 (2 x 3 =6). You have balanced the Cl atoms but now you have unbalanced Al atoms. If you put a...

**chemistry**

when do you need to use the octet rule for lewis structures and when does it not apply i am confused for N2O4 i cant get the rules to work with the structure

**chemistry**

hpw would i draw a lewis structure for a molecule with 3.5 bonds for example NO2???

**chemistry**

Why are all diatomic molecules diatomic molecules linear, regardless of the number of valence electron pairs on the atom? i dont understand this question what is meant by linear?

**chemistry**

okay i understand so writing the Lewis structures is just the math not the drawing?

**chemistry**

okay we are drawing bonds and i was wondering how i am supposed to know if you can make a double or triple bond for example for NH2OH why cant i make the bond between N and O triple instead of leaving lone pairs.. thanks

**math**

Define variables and write a system of equations for each situation. Solve using substitution. Suppose you are thinking about buying one of two cars. Car A will cost $17,655. Youn can expect to pay an average of $1230 per year for fuel, maintenance, and repairs. Car B will cos...

**Social Studies**

is another reason because people wanted to watch movies, which were popular during the time??

**Social Studies**

Give two reasons for the new interest in leisure activities in the 1920s. i already know one: rising wages and labor-saving appliances gave families more money and more time in which to spend it.what else?

**Social Studies**

thanks

**Social Studies**

what's one good and bad effect of Prohibition?

**Science**

what does the geologic time scale indicate about the change in life-forms over time?

**Science**

how did geologists determine the divisions of the geologic time scale?

**chemistry**

The total acidity in water samples can be determined by neutralization with standard sodium hydroxide solution. What is the total concentration of hydrogen ion, H+, present in a water sample if 300. mL of the sample requires 7.5 mL of 2.8 10-3 M NaOH to be neutralized? im conf...

**chemistryy**

never mind i took a random guess and got it right :)

**chemistryy**

Most window cleaners are aqueous solutions of ammonia. A 9.00 mL sample of a particular window cleaner requires 42.95 mL of 0.0508 M HCl for its titration. What is the molarity of ammonia in the window cleaner? i am completely lost i cant even find the balanced equation as you...

**CHEMISTRY HELP**

NH3 + HCl --> can someone please finish that?? is it 2H2 + N2 + Cl or something? if so how would i balance it?

**chemistry DRBOB**

yep thats what i got thanks a ton :)

**chemistry DRBOB**

Calculate the hydrogen ion concentration, in moles per liter, for solutions with each of the following pH values. pH=1.10 im guessing that this is what i did in my previous question except now i have to do it backwards. but i dont know how to do the calculations on the calcula...

**chemistry**

Calculate the hydrogen ion concentration and the pH of each of the following solutions of strong acids. (a) 0.00010 M HCl if you could just explain how to do this that would be great! thanks

**DRBOB**

help below please

**chemistry**

Write a chemical equation showing how each of the following species behaves as a base when dissolved in water a.) O2- i have O2- + H2O --> HO2- + OH- how do i make this right??

**chemistry**

does normality measure concentration of solutions??

**chemistry**

thanks

**chemistry**

for my test i have to be able to Be able to determine the final molarity of a mixture of two solutions my teacher said the formula was m1v1 = m2v2/m1+v2 or something like that is that right??

**chemistry**

what are the different types of solutions?? is it saturated nonsaturated and supersaturated?

**chemistry**

how many moles of hydroxide ions are there in 82.35 mL of a 2.164M Sr(OH)2 solution? i understand how to do the math for problems like these, but i dont know how to find the moles of just hydroxide ions.

**chemistry HELP DRBOB**

Calculate the sodium ion concentration when 80.0 mL of 4.5 M sodium carbonate is added to 30.0 mL of 1.0 M sodium bicarbonate. how do i solve this I dont really know where to begin.. is there a formula for finding concentration because we don't learn this in class we basic...

**sauce**

the formula is interest = prt

**chemistry**

.0511 L NH3 x (.127 mol NH3/L NH3) x (3mol HNO3/1 mol KOH) x (L KOH/.101 ml HNO3) = .193L = 193 mL i dont know where i messed up

**chemistry**

What volume of .101 M HNO3 is required to neutralize each of the following solutions? there are four and i got them all right but this one... 51.1 mL of .127 M NH3 i got 193 mL can someone please help???

**Chem**

it isnt an element its a polyatomic and it is C2O4 with a -2 charge

**Chemistry**

yes it could be 6, 5, 4, 3, or 2 if your periodic table isnt detailed enough it probably wont say

**Chemistry**

CrO4 is a polyatomic ion so it is one big part the charge on it is -2 the 4 has nothing to do with it if it were (CrO4)4 then it would be unbalanced

**chemistry**

If the volume of solute is 6 ml and the volume of the solution is 300 ml, what is the solute's percent by volume? is it solute/solution so % = 6/300 so then would it be % = .02 would i change it to 2%???

**chemistry**

h?? where

**chemistry**

this is answered below

**CHEMISTRY**

How much water should be added to 45.0 mL of 0.225 M HCl to dilute the solution to 0.155 M? i did .225M x .045L / .155M = 65mL so wouldnt 20 mL be added?

**chemistry**

How much of each starting material would you use to prepare 2.00 L of each of the following solutions? 0.240 M NaOH from 1.00 M NaOH stock solution what do i do with the .100 M and .240 M??

**chemistry**

thank you very much

**chemistry**

What is the molarity of a solution when 3L of a 4M solution is mixed with 3L of a 6M solution?

**chemistry**

How would you prepare 250.0 ml of a 0.6 M aluminum sulfate solution