Monday

April 21, 2014

April 21, 2014

Total # Posts: 42

**Chemistry**

How do you determine that a certain reagent will result in syn addition, anti addition, or be nonstereospecific? For instance the addition of H2/Pt to a cis-cyclic alkene results in a syn addition. HCl in water is nonstereospecific and Br2 in CCl4 is an anti addition. How can ...

**Calculus**

Alright I was clarifying since it's going to be graded. Doesn't hurt, does it?

**Calculus**

What if there isn't a fraction at all and it's just a graph with a function on it? My homework doesn't have a given expression of a function just a graphical representation of it.

**Calculus **

How can you tell where on a graph f is discontinuous? What are the criteria?

**Algebra**

The volume of a rectangular solid is 250 cubic centimeters. If its length is tripled, its width is halved, and its height is quadrupled, what is the new volume, in cubic centimeters?

**Chemistry-Pressure**

The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the environment. Therefore, two containers of waste solution are separated by a semipermeable membrane and pressure is applied to one container, forcing on...

**Chemistry**

Glycerol is a nonvolatile water soluble material. It's density is 1.25g/ml. Predict the vapor pressure of a solution of 2.40E2 ml of glycerol, in 385ml of water, at the normal boiling pt of water.

**Chemistry**

Using data from Appendix C in the textbook, calculate the equilibrium pressure of CO2 at 1000K .

**Chemistry**

A tank contains exactly 10^(6)liters of pure water. 1.0*10^(-6) moles of HCl (g) is bubbled into this tank. What is the resulting pH? The answer is 7, but I was only able to deduce that based on the fact that water has a neutral pH, but there's a mathematical way to do it ...

**Chemistry **

What is the pH of a solution that is .060M in potassium propionic and .085M in propionic acid? Ka=1.3E-5 for the acid. The answer is +4.73 but I don't know how to go about the problem. I thought that the potassium propionic was reacting with the acid to form their conjugat...

**Chemistry**

Which of the following salts is NOT more soluble in acidic solution than in pure water? A. ZnS B. AgCN C. Ba3(PO4)2 D. ZnCO3 E. BiI3 The answer is E, but I don't know why or how I would go about answering a question like this. What would I have to consider to determine this?

**Chemistry**

Never mind I figured it out

**Chemistry**

I2(g)+Br2(g)=2IBr(g) I .500 .500 0 C -x -x +2x E .500-x .500-x .84 I know K=[product]/[reactant] but I don't know what to do with the information from there.

**Chemistry**

A sealed 1.0L flask is charged with .500mol I2 and .500mol Br2 and an equilibrium reaction esues: I2(g)+Br2(g)=2IBr(g) When the container contents achieve equilibrium, the flask contains .84 mol of IBr. What is the value of the eqilibrium constant? (K)

**Chemistry**

Why does the color of Methyl Orange change at all in he presence of buffer components?

**Chemistry**

Why is a dilute solution of boric acid H3BO3 used as an eyewash? How does it work in cleansing the eye from chemicals?

**Chemistry**

Which of the following pairs would make a good buffer solution in an aqueous solution? A) H2SO4 and NaHSO4 B) Ca(NO3)2 and HNO3 C) HCl and NaCl D) HF and NaOH E) none of them I know the answer is D but I don't understand why. I would think it would be C since a goo buffer ...

**Chemistry**

How would I do it without the quadratic formula?

**Chemistry**

(Ksp= 5.0*10^-13) 1) Calculate the molar solubility of AgBr in 3.0×10^−2 M AgNO3 solution. 2) calculate the molar solubility of AgBr in 0.10 M NaBr solution. I tried solving using this the quadratic formula, but it didn't work. I started with these equations an...

**Chemistry**

Yeah that is what I put in as my answer since it asked for two sigfis, but it was still wrong.

**Chemistry**

If acetic acid is the only acid that vinegar contains [Ka = 1.8*10-5] , calculate the concentration of acetic acid in the vinegar. pH of vinegar is 3.20 _______________ First I got the antilog of the pH given, which turned out to be 6.309E-4. Then I did [(6.309E-4)^(2)]/(1.8E-...

**Chemistry**

0.15g of hydrogen chloride HCl is dissolved in water to make 8.0L of solution. What is the pH of the resulting hydrochloric acid solution?

**Chemistry**

The standardized NaOH solution was determined to be 120M whereas the mass of the sample of impure tartaric acid was 1.35g. If the initial reading of the buret volume changed from 48 ml to a final reading of 17 ml at the endpoint of the titration of the impure sample calculate ...

**Chemistry**

What are the units for rate constant? I know each may have different units for the k value, I just don't know how to get them. How can I tell just by looking at a given rate law?

**Chemistry**

What is the osmotic pressure of .100 M solution of aluminum chloride at 27 deg C? I used the formula: pi=(i)(M)(R)(T) wasn't sure what i was but for M put down 0.100M, R=0.08206 and T=300K Answer is 9.85, but not sure how to get that.

**Chemistry**

The freezing point of ethanol is -114.6 deg Celsius and its Kf value is 2.00degC/m. What is the freezing point for a solution prepared by dissolving 50.0g of glycerin in 200g ethanol? I thought it may have been using the formula deltaT=Kf*m, but I'm not sure.

**Science**

What are 6th grade examples of negative feedback mechanism?

**Chemisty**

A 0.5-L saturated solution of silver chloride, AgCl, is evaporated to dryness. The residue is equivalent to 1.4 x 10^-3 mole. Calculate the experimental value of the Ksp of silver chloride. Show all of your work.

**Spanish**

I think number 4 is wrong. Should it be Mi ropa está en el armario?

**Spanish**

Coud someone please check my answers to the questions? 1.¿Qué apagas cuando tienes frío? Apago la ventiladora cuando tengo frío. 2.¿Dónde están las cosas muy frías en tu cocina? Están en el refrigerador. 3.¿...

**Pre-Calc**

I'm so stuck-this stuff is so far above me right now-Please help where do I even start? Any hint would be so helpful- (3x^3-5^2+6x-9)/(x+5) or can someone direct me to a site that can solve this and show the steps-I don't even know where to start Thank you

**Pre-Calc**

I'm so stuck-this stuff is so far above me right now-Please help (3x^3-5^2+6x-9)/(x+5) or can someone direct me to a site that can solve this and show the steps-I don't even know where to start Thank you

**chemistry**

25cm3 of a solution of 0.1mol dm-3 NaoH reacts with 50cm3 of a solution of hydrochloric acid.What is the molarity of the acid

**Math**

7(x-2)+3(x+2)=5(x-6) x=?

**chemistry**

Calculate the pH at each stage in the titration of 25.0 ml 0.10 M KOH(aq) with 0.25 M HCl(aq). 1. Initiall ( before titration). 2. After addition of 5 ml of HCl. 3. After addition of 9.5 ml of HCl. 4. At the equivalent point. 5. After addition of 12 ml of HCl

**3rd grade**

Yes because you dont have equal number of groups.

**Chemistry**

How do cross linked branched polymers compare to cross linked linear polymers?

**science**

i need help on my sceince project i have a sceince fair on march somethin please give me any ideas possible u know plz thanks. (0.o)

**physics**

i choose answer d.

**the story of thesis**

THESIS was the protogena (primordial goddess) of creation, a divinity related to Phusis (Nature). She occurs in the Orphic Theogonies as the first to emerge at creation alongside the Hydros (the primordial waters). Sometimes she was represented instead as the female aspect of ...

**Math, Calculus**

Find the derivative of the function. y= xcosx - sinx What's the derivative? I get only one trig function. I will be happy to critique your work or thinking. Use the chain rule on the first term. Our class hasn't covered Chain Rule. Only product and quotient rule. Appar...

**Science**

kinetic energy is the energy that you use when an object is consistantly moving. for example wind is a kinetic energy because it is consistantly moving around or it has been moved.

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