hey can you do these problems?

[Dencology]

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hey. see the attachment

 

[Orgodox]

1. B
2. B
3. I would say .3 x .05 x 44 caze M= moles/L .015= Moles of H2CO3/ .3L then X( 1 mol co2/ 1 Mole H2CO3) X ( 44g co2/ 1 mol co2) so .3 x .05 x 44
4. Colligative properties, depends on how it ionized SiO2 = 3 NaCl only = 2
5. What does that mean if 90% of a solution, wheres the other 10%?
6 overall rate =2
7. 4 electrons
8. Sp3 like watre
9. e
10 a

 

[osimsDDS]

I am just going to post the answers if you have questions then ask...

1) I believe it would be thrombocytes cuz the innactive form is platelets...
2) 4 (2x2 heterozygotes =4)
3)I didnt get any of the answers you provided, I got (.3)(.05)(44). because you have .05 mol/1L multiply by .3L you get moles and then multiply by 44g/1mole and you will get just grams...the question is asking for grams so if you do this the liters will first cancel and then the moles will then cancel when you multiply by the MW...
4) I got 43.5g of NaCl...dont understand how i got this one wrong cuz its not even an answer choice but i am pretty certain its correct...i used vant-hoff factors for this...2 for NaCl and 3 for SiO2
5) im gonna guess a basic solution of 9...since the molarity of NaOH is higher than that of 90% .1M HCl which is .09M...
6) 2nd order i believe
7) 2???
8) sp3
9) B, (60)(12)/(.1)
10) ill go with A...OH- is a greater electron donating group than CH3 and benzene...higher the electron donating effect (stronger activating group) the more easily it will react with an element (Br-) that is looking for electrophillic substitution/addition to the ring...

Please correct me if iam wrong on number 10 thanks!!!

 

[harrygt]

I am just going to post the answers if you have questions then ask...

1) I believe it would be thrombocytes cuz the innactive form is platelets...
2) 4 (2x2 heterozygotes =4)
3)I didnt get any of the answers you provided, I got (.3)(.05)(44). because you have .05 mol/1L multiply by .3L you get moles and then multiply by 44g/1mole and you will get just grams...the question is asking for grams so if you do this the liters will first cancel and then the moles will then cancel when you multiply by the MW...
4) I got 43.5g of NaCl...dont understand how i got this one wrong cuz its not even an answer choice but i am pretty certain its correct...i used vant-hoff factors for this...2 for NaCl and 3 for SiO2
5) im gonna guess a basic solution of 9...since the molarity of NaOH is higher than that of 90% .1M HCl which is .09M...
6) 2nd order i believe
7) 2???
8) sp3
9) B, (60)(12)/(.1)
10) ill go with A...OH- is a greater electron donating group than CH3 and benzene...higher the electron donating effect (stronger activating group) the more easily it will react with an element (Br-) that is looking for electrophillic substitution/addition to the ring...

Please correct me if iam wrong on number 10 thanks!!!

1) basal cells are in the skin. [thrombocytes are the same as plateletes which are always present in blood

2) 4



3)Sorry, I'm tried and don't wanna do any calculations right now

4) Skipped like question 3

5) 2
If you decrease the H+ concentration by 10 times [as we have here], PH will go up one unit.

6) First order! The previous answers for 6 are wrong. you double conc of both reactants, but the overall rate is doubled. It means one of the reactants is to the power of zero, and the other is to the power of 1 [0 + 1 = 1 = first order]

7) 4 electrons [C goes from 0 to C 4+, and 2 oxygens go from 0 to 2- ] It means 4 electrons were transferred from C to two Oxygen atoms.]

8) sp3

9) e [concentration is decreasing by a factor of 120, so volume should be increased 120 times. BUT! remember to subtract the initial 60, because it is asking how many mililiters we shoud ADD.

10) a

 

[Orgodox]

After further discussion with Osims (and reference with Princeton MCAT) I think 7 would be 0 since it is a covalent bond.

 

[Glycogen]

b
b
a,I think because the co2 is limiting reagent and the only sounrce of carbon is CO2 in H2CO3 so we will conside that.
d
e,I think it should be basic since some the acid source has not been used 100%
c
e
c
e
a

 

[Dencology]

hey, my answer in red.

I am just going to post the answers if you have questions then ask...

1) I believe it would be thrombocytes cuz the innactive form is platelets...
2) 4 (2x2 heterozygotes =4)
3)I didnt get any of the answers you provided, I got (.3)(.05)(44). because you have .05 mol/1L multiply by .3L you get moles and then multiply by 44g/1mole and you will get just grams...the question is asking for grams so if you do this the liters will first cancel and then the moles will then cancel when you multiply by the MW...
4) I got 43.5g of NaCl...dont understand how i got this one wrong cuz its not even an answer choice but i am pretty certain its correct...i used vant-hoff factors for this...2 for NaCl and 3 for SiO2
5) im gonna guess a basic solution of 9...since the molarity of NaOH is higher than that of 90% .1M HCl which is .09M...
6) 2nd order i believe
7) 2???
8) sp3
9) B, (60)(12)/(.1) i thin the answer is E. because you want to find out how much you need to add to 60mL so we have to subtract V2 from 60.
10) ill go with A...OH- is a greater electron donating group than CH3 and benzene...higher the electron donating effect (stronger activating group) the more easily it will react with an element (Br-) that is looking for electrophillic substitution/addition to the ring...

Please correct me if iam wrong on number 10 thanks!!!

 

[pistolpete007]

AGAIN can some1 please tell me when u have to subtract your V2 from the initial volume....i can not get this straight in all of achiever and top score u never did that i was looking for both types of question so i could compare but didnt happen....what is the "word" or "phrase" your looking for that you subtract the initial from the final....and what is the "word" or "phrase" u look for when u just leave it.....can some1 give examples of both PLEASE dat in 23HOURS!

 

[doc toothache]

Problem #4 has questionable practical merit since silica has limited solubility (0.012g/100ml H2O) and is unlikely that the small amount that dissolves will dissociate.

10% of 0.1M HCl= 0.1 x 0.1= 0.01M; pH=2

AGAIN can some1 please tell me when u have to subtract your V2 from the initial volume....i can not get this straight in all of achiever and top score u never did that i was looking for both types of question so i could compare but didnt happen....what is the "word" or "phrase" your looking for that you subtract the initial from the final....and what is the "word" or "phrase" u look for when u just leave it.....can some1 give examples of both PLEASE dat in 23HOURS!

how many milliliters of water need to be added to 60mL of 12M NH3 in order to make it 0.1M?

Need to subtract because the calculation gives you the total volume of 0.1 M NH3 that can be made from 12 M.

 

[drgreen]

5) im gonna guess a basic solution of 9...since the molarity of NaOH is higher than that of 90% .1M HCl which is .09M...

The answer is pH=7, he uses the word neutralized

 

[drgreen]

1)b
2)b
3)none (.3)(.05)(44)
4)c
5)d "neutralized means pH=7"
6)c
7)e
8)c
9)e
10)a

 

[doc toothache]

The answer is pH=7, he uses the word neutralized

If "" 90% "" of a 0.1 M solution of HCl is neutralized with 0.1 M NaOH, what is the pH of the solution?

 

[klutzy1987]

If ""90%"" of a 0.1 M solution of HCl is neutralized with 0.1 M NaOH, what is the pH of the solution?

The ph would be like 1.9 or so.