Wednesday
April 16, 2014

Posts by Jim_R


Total # Posts: 62

chemistry
thanks dr bob

chemistry
hey guys im stumped and burning out. Its mid term time. I got 5 midterms and lab test. i think im making this more complex than needed what is 10mg/dL Ca in mEq/L can u show me a simple way using the valence ? My answer doesnt make sense. ---------------------------- N=(gram s...

chemistry
damn i never thought of kg of solution. your so smart. 2.00mol x 40 g/m= 80grams dissolved in water. so 80 grams of solute and 1000 water. Chemistry doesnt make sense too me sometimes. Im use to thinking water =ml. But kg can be a solution too if you weigh it on an analytical ...

chemistry
how many grams of NAOH are needed to make a 2.00 molal solution? I got stuck here 2.00 molal=2.00 mole/kg molecular weight of NAOH= 40g/mol (2.00 g/molecular weight x kg) x 40 g/mol= stuck thanks jim

biology
great thanks

biology
Hydrogen bond v covalent how are they sim and diff Both involve chemical bonds where bonds are formed from electrostatic forces covalent bonds involve the sharing of electrons between atoms. Outer valence shells are filled by the sharing of atoms. This creates a strong bond Hy...

biology
thanks. ok heres what i got from the book. the post synaptic neuron receives a chemical signal and generates the electrical signal. for the axon problem my teacher said sensory neurons transmit a signal along its axon to the cell body. The motor neuron tranmits a electrical si...

biology
hi do dendrites generate or conduct impulses and do axons transmit to and from the cell body or do they transmit it away. thanks jim

biology
My teacher said hyrostatic pressure is when a pressure is exerted on a membrane due to an increase in volume. This cause water to move from a low con to a high con and for osmotic he said the opposite. Its the force that cause water to move into a cell. Its due to a high solut...

biology
hi i have a few questions 1)osmotic pressure Basically, i got that its the pressure opposing osmois. can you explain it to me ? 2)hydroltic pressure Im thinking that its the pressure that builds up due to a higher concentration. Must be like potiential energy.

chemistry
thanks. your method works out. Ill stop when i have questions writing it up :)

chemistry
Sorry, my browswer is going crazy. Here's exactly what it says for part B Use 10ml pipet to transfer 10.00ml into a clean 50.00ml flask. In the fumehood add about 5ml of 6M Nh3. Dilute this to 50.00ml using distilled water.

chemistry
k thanks it says cu(nh4)2+ in my pre lab. yep. And then we added 5ml of 6M NH3. Then duluted to 50.00ml mark.

chemistry
k thanks it says cu(nh4)2+ in my pre lab. yep. And then we added 5ml of 6M NH3 That step messed me up :)

chemistry
k thanks it says cu(nh4)2+ in my pre lab.

chemistry
did i do this right calculate the con of cu(nh4)^2+ of solution. Mass of cuso4*5h20=.6000g First i dissolved the sample into 50.00ml of water. I filled up volumetric flask to 100.00 ml mark I then, pipetted 10ml of this sample into a 50.00ml volumetric flask. I then topped it ...

Earth Science
A hypothesis is a tenative explanation for a phenomena that leads to scientific inquiry to find out if its support or rejected

science
It will never be on a test don't worry about it.

chemistry
1)how many Meters of wire (diamter=6.304 x10^-3) can produced from from 5.01 lb of a mixture of ore and copper that is 66% copper d of copper =8.95 g/cm^3 cylinder =pie r^2 H answer is 8.32 x 10^3m 2) v=4/3pie r^3, r=17.282 mm my solutions books says this: 4/3 Pie (17.282 m)^3...

math
sixteen million twenty-one thousand and eight-hundred forty-nine.

science
i better write it out properly Naoh=2.991 mol Hcl=25.00 Ml, Density =0.952g/ml, mm=35.46g/mol

science
Hey, holidays is over. Time to get back to work. whats the answer to this one find the concentration of hcl in g hcl/kg Naoh + Hcl---> b +c 2.991 mol 25.00mL Density=0.952g/ml also Hcl=36.46g/mol I got approx 4.58 x 10^3 g/mol of the top of my head

Chemistry
4.67

Chemistry
ti= 3.0g/ 204.3833 =1.47 x 10^-2 cl2= 8.0/35.45 /2=1.1 x 10^-1 ti is the Lr since it produces less product.

Chemistry
must be each reactant ? or total reactants ? Ill do each Step one: mm of products cu=63.546 2cl=70.90 ------------ 134. 45g/mol step two mol of products 16.0 g/134.45=1.19 x 10^-1 mol x step two find the lr cu=15.0 /63.546 =.236mol produced cl=10.0/70.90=.141 lr is cl three tu...

spelling
another word for sentence ? I spelled a word wrong in a sentence ? I spelled sentence wrong. I spelled a word wrong in a sentence.

math heeelp
5/16

4th grade
They are complex, grow, have homeostasis, metabolism, reproduce, respond to environment. Basically, they exert some internal control in response to external stimuli

8th grade
or an ex :)

writing
thanks never would have thought to structure it like that.

writing
quick question, how do i structure the following. Compare and contrast ferns and agiosperms. A) talk about their reproductive success B)explain how they are dispersed to different habitats intro; background on ferns. Then some stuff about angiosperms being the most diverse gro...

writing
Hi my writing isn't very good Is there a site with exercises so i can improve my writing skills. Like short stuff. I only have 3 weeks till the next term and i don't know how to structure an essay is there a site with some info ? thanks again, Jim

English
Is this a letter ? I think you should center it around a main point rather than list all your stuff. It should be cleaner with space. Single spaced with no indentation. Formal business language. You have too much stuff. Just list some and the rest hold onto for your interview....

Walk Two Moons
I think it means don't be judgmental. Have an open mind towards all people.

HCA 210 Introduction to Health Care
1)Heres what mental illness is. Its an impairment of the mind that limits or impairs their life on a daily basis. Diabetes isn't a mental illness. And can it be cured? Unfortunately, it doesn't seem so. I think we take the approach that it is not, but what we try to do...

biology
thanks that stuff confuses me. I really don't understand it at all.

biology
just wondering how the moss, ferns and angiosperms life cycles are similar and different. I really don't understand this reproductive stuff. sim's all three life cycles alternate between haploid and diploid. I don't know much here so i can't fill in much detail...

chemistry
what ? This is from a test. I don't remember the numbers. The teacher never explained it so im trying to find a method to do it. In part A we are asked to find the change of heat. Change of heat =standard heat of formation. (H with the little circle) At this point i don...

chemistry
thermochemistry chem conceptual. i just want to check my understanding of this Say you got this: 1)A + b=c A=4.0 grams and -91.8kj evolve How do you find change of H ? I guess you convert A to grams and then shove it under the evolved heat ? ie. change of H= -91.8kj/2 mol= 2)N...

chemistry
k thanks Its a practice question for my final exam. No answer is given.

chemistry
10.0 g sample of p-dichlorobenzene, a component of mothballs, is dissolved in 80.0 g of benzene, C6H6. The freezing-point of the solution is 1.20oC. The freezing point of benzene is 5.48oC. The molal freezing –point constant, kf, for benzene is 5.12oC/m. Calculate the app...

English
first i think you need to define strong supportive parent/ Do you think most single parent households have good parents ? What is a good parent ? Can a single parent be a good parent why or why not ? Are both parents still involved or is just one? How are the parents involved ...

biology
hi do my answers look ok? i just made them up off the top of my head.

biology
trying to find the sims and differences for the following --------------------------------------- fertilization v pollination sim's both part of the process of sexual repro diff. pollination doesnt involve direct contact since it is transfer from the anther to the stamens ...

biology
thanks

biology
whats the similarities and difernces between gonochoristic and hermaphroditic ? thanks again Jim

biology
How are haploid and diploid cells similar ? thanks again Jim

chemistry
Damn thanks dr. bob I should be paying you 400 dollar rather than my college Can you help me with my labs. Im having some problems since i haven't done em before. I forgot how to calculate titrations last one so i kinda messed up :)

chemistry
Damn thanks dr. bob I should be paying you 400 dollar rather than my college Can you help me with my labs. Im having some problems since i haven't done em before. I forgot how to calculate titrations last one so i kinda messed up :)

chemistry
I think i figure them out But i still dont understand them conceptually. like in D We have an excess of Hno3 and H2nnh2 is the limiting reagent. Yet we use this formula Hno3 + h20---etc. What happend to the H2NNH3

chemistry
hi kinda stuck :) 100.0 ml of 0.100 M H2NNH2 (kb =3.0 x10^-6) is titrated by 0.200M calculate PH after adding the following volumes of HNO3 a 0 b 25.0 ml c 50.0 ml d 60.0 ml ----------------------------------------- A) N2H4 + HNO3 --> N2H5+ + NO3- .100 0 0 3.0 x 10-6= x2/.1...

chemistry
thanks. Damn your smart dr.bob

chemistry
how bout if 200ml of koh is added ? the answer is 8.78 im getting 12.82

chemistry
how bout if 200ml of koh is added ?

chemistry
thanks i found the lr then plugged did some extra stuff that i should have thanks again Jim

chemistry
hi im having problems figuring this out. consider the titration of 100 ml of 0.200 acetic acid by 0.100 koh. Calculate the ph if 250 ml of koh is added ? I tried to find the limiting reagent and go from there but it was a no go then i used the kb for find the poh and then the ...

chemistry
here's what i finally ended up with I don't know why u used 59 grams nac2h302 x 3h20---> na + c2h302 + 3h20 sodium acetate trihydrate=acetic ions .3470 g nac2h302 x 3h20 /136.10= 2.550 x 10-3 mol acetic ions formed 2.550 x 10-3 M/.0150 L=.17 ka= (5.0 x 10-5)(.17)/(....

chemistry
thanks i got ka=2.5 x 10^-5 and 2.5 x 10-6 thanks again Jim

chemistry
oh This is an acid base experiment this is the last stage. There are two parts: part 1) 0.3470g sodium acetate trihydate is added to 15.00 ml acetic acid (concentration is 0.20) then its mixed and a ph is taking--i got 4.30 PH part II) Added 0.7618 g of sodium acetate trihydra...

chemistry
ok im not sure how to do this 15.00ml of acetic acid is pipetted into a flask 0.35 grams of sodium acetate trihydrate is added and mixed then 0.75 of the hydrate is added 1)i assumed that the volume(s) are additions. 15.00ml x .35g *m/1.45g and for the second part 15.00 + 0.35...

Biology
k, thanks wasn't sure if i had the similarities correct.

Biology
Hi Im just wondering what are the similarites and differences between gas exchange and cellular respiration ? similarities: Both are involved in energy production. Gas x supplies o2 to the mito which creates usable energy for the body. differences; cellular occurs inside cells...

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