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Questions and answers by
Jim_R
Questions (20)
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
3 answers
502 views
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
4 answers
1,081 views
Hydrogen bond v covalent
how are they sim and diff Both involve chemical bonds where bonds are formed from electrostatic forces
2 answers
702 views
hi
do dendrites generate or conduct impulses and do axons transmit to and from the cell body or do they transmit it away. thanks
3 answers
599 views
hi
i have a few questions 1)osmotic pressure Basically, i got that its the pressure opposing osmois. can you explain it to me ?
3 answers
510 views
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
7 answers
729 views
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%
2 answers
859 views
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 +
2 answers
614 views
quick question,
how do i structure the following. Compare and contrast ferns and agiosperms. A) talk about their reproductive
3 answers
738 views
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
3 answers
507 views
just wondering how the moss, ferns and angiosperms life cycles are similar and different.
I really don't understand this
3 answers
547 views
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
3 answers
481 views
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
3 answers
1,312 views
trying to find the sims and differences for the following
--------------------------------------- fertilization v pollination
1 answer
527 views
whats the similarities and difernces between gonochoristic and hermaphroditic ?
thanks again Jim
3 answers
385 views
How are haploid and diploid cells similar ?
thanks again Jim
5 answers
925 views
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
4 answers
5,355 views
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
7 answers
696 views
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
7 answers
589 views
Hi
Im just wondering what are the similarites and differences between gas exchange and cellular respiration ? similarities: Both
3 answers
525 views
Answers (41)
thanks dr bob
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
great thanks
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
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.
thanks. your method works out. Ill stop when i have questions writing it up :)
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.
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.
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 :)
k thanks it says cu(nh4)2+ in my pre lab.
A hypothesis is a tenative explanation for a phenomena that leads to scientific inquiry to find out if its support or rejected
It will never be on a test don't worry about it.
They are complex, grow, have homeostasis, metabolism, reproduce, respond to environment. Basically, they exert some internal control in response to external stimuli
5/16
another word for sentence ? I spelled a word wrong in a sentence ? I spelled sentence wrong. I spelled a word wrong in a sentence.
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
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.
4.67
sixteen million twenty-one thousand and eight-hundred forty-nine.
i better write it out properly Naoh=2.991 mol Hcl=25.00 Ml, Density =0.952g/ml, mm=35.46g/mol
thanks never would have thought to structure it like that.
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
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
I think it means don't be judgmental. Have an open mind towards all people.
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
thanks that stuff confuses me. I really don't understand it at all.
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
k thanks Its a practice question for my final exam. No answer is given.
hi do my answers look ok? i just made them up off the top of my head.
thanks
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 :)
I think i figure them out But i still don't 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
thanks. Damn your smart dr.bob
how bout if 200ml of koh is added ? the answer is 8.78 im getting 12.82
how bout if 200ml of koh is added ?
thanks i found the lr then plugged did some extra stuff that i should have thanks again Jim
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
thanks i got ka=2.5 x 10^-5 and 2.5 x 10-6 thanks again Jim
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
k, thanks wasn't sure if i had the similarities correct.
