test your skills... (some questions similar on dat)

[faerielynx]

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PLEASE TYPE OUT DETAILED ANSWERS...

1. which one does not react with XMgBr?
alcohol, diethyl ether, acetone?

what's the requirement for grignard? What are things that wouldn't react with it?

2. Waste from the liver dumped into?
kidney?

3. which would produce an acidic solution?
NH3, CaCO3, CO2, CH3OH

4. Which compound has the highest melthing pt?
dipoles, alkanes, molecular crystals, salts, metals

5. Charge on I for ICI3?

6. Which hormone acts as a secondary messenger?

7. most acidic?
I, Br, Cl, F

8. term for the change from a pond to terrestrial habitat?

9. internal pressure if V=500ml, T=75C, R=.08, 18g of compound with MM=44g/mol?

10. ccDNA from RNA termed?
reverse transcriptase, trancription, translation

11. frog who has another pocket under the ectoderm notochord, what would it be?
gut, eye, neural organ

12. se has one more electron that arsenic, what subshell is se?
3s, 3p, 4s, 4p, 5s

13. Half life is 15mins, after one hour, how much left it start with 16g?

14. what will decolarize a solution with Bromine?

15. liquid at room temp?
Cl, Br, F, I, CH3

16. if no change in activation energy, which is true?
delta H=0, delta S=0, no catalyst, equilibrium

17.an autotrophic eukaryote doesn't have?
chloroplast, ribosome, mitochondria, nucleus, lysosome?

18. in one tank you have Y moles Hydrogen, you add oxygen, how many moles of oxygen do you have now?
Y, 2Y, Ysquared

19. which only yields acetone upon ozonolysis?

20. container A has 10 gallons water and 5 gallons alcohol and B has 12 gallons water and 3 gallons alcohol. Container C nees to have 8 galons with 25% alcohol. How much needs to be removed from each?
5 gal from A: 3 gal from B, 3.75 gal from A: 4.25 from B, 4.25 from A: 3.75 from B, 4 gal from each, 3 from A: 5 from B

update

1. What is 400 mg + 4000 micrograms + .035 grams

2.Dad is 5 times older than Daughter; 4 years ago he
was 13 times older; how old is she today?

3. Area of the cylinder: base, 6 diameter and height, 8

4.1/3 pop has condition A; of a sample of 4 people, 1 has condition A; what percentage has A?

5.Which is most likely true if a+b>a-b
A. a>0
B. b<0
C. a<0
D. b>0

6. celsius if 14F

7. 42degrees to 25degrees, is this endo or exothermic?

8. log 2=.33, log 3=.44something, log 1500=?

9. Kc=.1, N2 + O2 ---> 2NO
O2 is .1, NO is .4, how much is N2?

10. car a goes 100 miles at 60 mph, then goes 12 mi for 30 mph, what is avg speed?

11.-.465C, 1.865C m-1, find molar mass
Tb=Kb * m

12. sqrt of sqrt 600

13. 12000 loan, one place gives 8% rate another gives 10%. she pays $1100 so how much does she have at the 8% rate

14. 3*sqrt5 / sqrt15 solve it

15. 13/7N ---> 0 +1 e + ____

16. rectangle whose perimeter is 72 and width is 4 more than the sides/height. what is the area?

 

[mddang]

1. which one does not react with XMgBr?
alcohol, diethyl ether, acetone?
diethyl ether
Alcohol has an acidic proton. (-OH)
With acetone, we would have nucleophilic adition at the carbonyl carbon.

what's the requirement for grignard? What are things that wouldn't react with it?
No acidic protons or polar functional groups, unless you want these polar functional groups to react w/ the grignard. Ethers as solvent.

2. Waste from the liver dumped into?
blood circulation?... Later to be picked up by the kidneys (if we're talking about urea..)
kidney?
urinary bladder... The kidney makes peeeeeee.

3. which would produce an acidic solution?
NH3, CaCO3, CO2, CH3OH
CH3OH.. I guess

4. Which compound has the highest melthing pt?
dipoles, alkanes, molecular crystals, salts, metals
Salts
Ionic bond = stronggggg

5. Charge on I for ICI3?
0

6. Which hormone acts as a secondary messenger?..
ummm...

7. most acidic?
I, Br, Cl, F
HI
The I- anion is the largest, so the charge is the most delocalized.
HF on the other hand does not dissociate completely like the other three hydrohalic acids. The H-F bond is a pretty strong bond due to the high EN and relatively small size of F.

8. term for the change from a pond to terrestrial habitat?
Evolution (haha.. I dunno..)

9. internal pressure if V=500ml, T=75C, R=.08, 18g of compound with MM=44g/mol?
(.0821)(1/.5)(348)(18/44)

10. ccDNA from RNA termed?
reverse transcriptase, trancription, translation
If we're going from RNA -> DNA, it's gotta be reverse transcriptase. The other two answer choices are obviously wrong..

11. frog who has another pocket under the ectoderm notochord, what would it be?
gut, eye, neural organ
Is this asking which originates from the mesoderm?? This is a weird question.. I don't understand 'ectoderm notochord'. The notochord is derived from the mesoderm.
gut

12. se has one more electron that arsenic, what subshell is se?
3s, 3p, 4s, 4p, 5s
Simply look at the periodic table.


13. Half life is 15mins, after one hour, how much left it start with 16g?
1g
After one hour, we go through 4 half lives.
16g(1/2)^4

14. what will decolarize a solution with Bromine?
activated carbon?? no idea..


15. liquid at room temp?
Cl, Br, F, I, CH3[/quote]
I
Larger molecule = larger surface area = stronger london dispersion forces = stronger intermolecular bonds

16. if no change in activation energy, which is true?
delta H=0, delta S=0, no catalyst, equilibrium
The presence of a catalyst does not alter delta H, delta G, K (equilibrium constant). It does lower activation, which results in an increased rate of reaction... It does alter the k in the rate law of a reaction. (rate = k[A].. whatever it may be)

17.an autotrophic eukaryote doesn't have?
chloroplast, ribosome, mitochondria, nucleus, lysosome?
Uhhh... It can have all of these... but I guess I'll say lysosome for the sake of the question. An autotrophic eukaryote MIGHT NOT have lysosomes.
Chloroplasts contain the pigments for photosynthesis, ribosomes for protein synthesis, mitochondria for cellular respiration, nucleus for obvious reasons.

18. in one tank you have Y moles Hydrogen, you had oxygen, how many moles of oxygen do you have now?
Y, 2Y, Ysquared
The question is very poorly worded.. or maybe I just don't get it

19. which only yields acetone upon ozonolysis?
2,3-dimethylbut-2-ene
Draw it out if you can't picture it in your head and see for yourself.

20. container A has 10 gallons water and 5 gallons alcohol and B has 12 gallons water and 3 gallons alcohol. Container C nees to have 8 galons with 25% alcohol. How much needs to be removed from each?
5 gal from A: 3 gal from B, 3.75 gal from A: 4.25 from B, 4.25 from A: 3.75 from B, 4 gal from each, 3 from A: 5 from B
A is 33.3% alcohol, and B is 20%
25% is closer to B than A, so you're going to have more B than A.. Knowing this alone will help eliminate several answer choices. After that, just work out what you've got left.

Let X = gallons of A and Y = gallons of B.
(33.3X + 20Y)/8 = 25
33.3X + 20Y = 200

Just plug stuff in..

3 from A: 5 from B

 

[War Eagle]

PLEASE TYPE OUT DETAILED ANSWERS...

1. which one does not react with XMgBr?
alcohol, diethyl ether, acetone?
Diethyl ether
what's the requirement for grignard? What are things that wouldn't react with it?
It will react with protic solvents and electrophiles. It is pretty much the strongest base you'll come across, so it will react with anything that can act as an acid.
2. Waste from the liver dumped into?
It can dump wast into the blood to be filtered by the kidney (ex. urea). It can also excrete wastes with bile into the intestines to be expelled with feces (ex. bilirubin)
kidney?
Urine
3. which would produce an acidic solution?
NH3, CaCO3, CO2, CH3OH
Both CO2 and CH3OH. High concentrations of CO2 in the blood lower pH. CH3OH has an acidic proton.
4. Which compound has the highest melthing pt?
dipoles, alkanes, molecular crystals, salts, metals
Ionic salts
5. Charge on I for ICI3?
0
6. Which hormone acts as a secondary messenger?
Not sure what you're looking for here. Generally hormones trigger a cascade that is carried out by secondary messengers. If there is one, please tell.
7. most acidic?
I, Br, Cl, F
Assuming you're asking about the hydrogen-halide, HI
8. term for the change from a pond to terrestrial habitat?
Ecological succession
9. internal pressure if V=500ml, T=75C, R=.08, 18g of compound with MM=44g/mol?
PV=nRT
P=nRT/V
P=(m/MM)*RT/V
P=(18/44)*.08*348/.5
P=22.8 atm

10. ccDNA from RNA termed?
reverse transcriptase, trancription, translation
reverse transcriptase

11. frog who has another pocket under the ectoderm notochord, what would it be?
gut, eye, neural organ
gut?
12. se has one more electron that arsenic, what subshell is se?
3s, 3p, 4s, 4p, 5s
4p
13. Half life is 15mins, after one hour, how much left it start with 16g?
1g. After 15 min: 8g; after 30 min: 4g; after 45 min: 2g; after 60 min: 1 g.
14. what will decolarize a solution with Bromine?
good question
15. liquid at room temp?
Cl, Br, F, I, CH3
I. That's my guess considering that propane is a gas. Of the 3 halogens, I has the largest electron cloud, which may allow for more dipole-dipole interactions allowing it to exist in the liquid phase. Also, don't they put Iodine on you before they draw your blood? Not sure if thats pure I or not though.
16. if no change in activation energy, which is true?
delta H=0, delta S=0, no catalyst, equilibrium
no catalyst
17.an autotrophic eukaryote doesn't have?
chloroplast, ribosome, mitochondria, nucleus, lysosome?
Lysosome I guess. I know it has the other three, but the central vacuole in plants can act as a lysosome.
18. in one tank you have Y moles Hydrogen, you add oxygen, how many moles of oxygen do you have now?
Y, 2Y, Ysquared
Wouldn't that depend on how many moles of oxygen you added? Not sure what you're looking for here.
19. which only yields acetone upon ozonolysis?
1,2-dimethyl-2-butene
20. container A has 10 gallons water and 5 gallons alcohol and B has 12 gallons water and 3 gallons alcohol. Container C nees to have 8 galons with 25% alcohol. How much needs to be removed from each?
5 gal from A: 3 gal from B, 3.75 gal from A: 4.25 from B, 4.25 from A: 3.75 from B, 4 gal from each, 3 from A: 5 from B
3 from A, 5 from B

I took a round-a-bout way of solving this. I said that container A is 33% alcohol, and container B is 20% alcohol. Container C can only have 2 gallons of alcohol in in. 25% is closer to 20% than 33% so you'll need more B than A. I looked at the answers and multiplied the gallons removed from each by their respective alcohol percentages and added up the answers to see if I got 2.

3*.33=1
5*.2=1
1+!=2

 

[Sama951]

14. what will decolarize a solution with Bromine?

An alkene😀

 

[mddang]

15. liquid at room temp?
Cl, Br, F, I, CH3
I. That's my guess considering that propane is a gas. Of the 3 halogens, I has the largest electron cloud, which may allow for more dipole-dipole interactions allowing it to exist in the liquid phase. Also, don't they put Iodine on you before they draw your blood? Not sure if thats pure I or not though.

Methane, ethane, propane, and butane are all gases at room temp.

Just think of Hank Hill...

Propane and propane accessories..

An alkene😀

Niiice 👍

 

[War Eagle]

Methane, ethane, propane, and butane are all gases at room temp.

Just think of Hank Hill...

Propane and propane accessories..

Dang it Bobby!!!

 

[TexasDent]

11. frog who has another pocket under the ectoderm notochord, what would it be?
gut, eye, neural organ
The only logical answer here is the eye because the retina of the eye is formed from two mesodermal pockets of the mesoderm and the lens is formed from the ectoderm. The only reason I am confused by the wording of the question is because it says "under the notochord" and the mesodermal pockets for the eyes are on the anterior side of the notochord, but I guess under could be on the anterior side. Whereas, the neural organ (brain) is formed from the ectoderm and the gut is formed from the endoderm.
15. liquid at room temp?
Cl, Br, F, I, CH3[/quote]
I may be wrong but I believe the main reason that I2 is a liquid state at room temperature is because of its large molecular weight. I think its large atomic radius actually makes its intermolecular bonds weaker but the weight overrides this and keeps it from turning into a gas.

 

[faerielynx]

i think:
F2 and Cl2 are gases
Br2 are liquids
I2 are solids...

 

[mddang]

i think:
F2 and Cl2 are gases
Br2 are liquids
I2 are solids...

Oooo, wikipedia says you're right.

 

[faerielynx]

so its Br right?

 

[pistolpete007]

where'd u get thee questions from

 

[Dencology]

how is the charge on I is 0?
what is ccDNA?

 

[Dencology]

how is the charge on I is 0?[

/quote]

 

[TexasDent]

ccDNA is closed circular DNA which is what prokaryotes contain.

The charge on an Iodine molecule is 0 because Iodine is a diatomic molecule; therefore it is I2 and the charge on both cancels the other out making them Non Polar.

 

[Streetwolf]

Here are the math ones from part 2:


2.Dad is 5 times older than Daughter; 4 years ago he
was 13 times older; how old is she today?

D = 5C (C = child, D = dad). 4 years ago means D-4 and C-4. So 4 years ago: D - 4, he was: =, 13 times older (than her): 13(C-4). So you have D = 5C and D-4 = 13(C-4). Sub in D = 5C into the second equation.

5C - 4 = 13C - 52
48 = 8C
C = 6 years old. Dad would be 30. Four years ago she was 2 and he was 26. Answer is 6 years old.

3. Area of the cylinder: base, 6 diameter and height, 8

Cylinder is like a bunch of circles stacked on top of each other. The area of each circle is pi*r^2. When you stack them up and want the volume, just multiply the area of each circle (the base) by the height.

V = pi*r^2*h

I'm not sure what each measurement is because of the way you wrote it out. Also you wrote area but made it sound like you want the volume. If you want the surface area you need to consider 3 things. The first two things are the top and the bottom circles. Find those areas (pi*r^2). The third thing is the area of the "straight" part of the cylinder. Just think how that was made. Picture cutting a straight line from base to top, and then unfolding the cylinder. You'd have a rectangle. The length of the rectangle is the height of the cylinder. More tricky is the width. The width is actually the circumference of the base (WHY?). Knowing this, the surface area of a cylinder is:

2*pi*r^2 + 2pi*r*h

Again since your numbers weren't written too well, I can't solve this for you.

4.1/3 pop has condition A; of a sample of 4 people, 1 has condition A; what percentage has A?

Ummm 25% of the 4 people has condition A??

Do you mean what are the odds that 1 of 4 will have it? In that case it would be:

(4 choose 1) * (1/3)^1 * (2/3)^3 = 4*(1/3)*(8/27) = 32/81 ~ 39.5%.

5.Which is most likely true if a+b>a-b
A. a>0
B. b<0
C. a<0
D. b>0

a+b > a-b so b > -b so 2b > 0 so b > 0. Choice D.

6. celsius if 14F

Formula is all over the internet, you can do this one.

8. log 2=.33, log 3=.44something, log 1500=?

log 1500 = log(100*15) = log(100) + log(15). Not sure how log(2) helps you here. log(100) = 2. log(15) = log(3*5) = log(3) + log(5). You'd need to know log(5) here for an exact answer. Otherwise you'd have to guess.

10. car a goes 100 miles at 60 mph, then goes 12 mi for 30 mph, what is avg speed?

Ave speed = total distance / total time

First leg of the trip is 100 miles @ 60 mph = 5/3 hour. Second leg of the trip is 12 miles @ 30 mph = 2/5 hour.

Total distance = 100 + 12 = 112 miles.
Total time = 5/3 hour + 2/5 hour = 31/15 hour.
Average speed = 112 / (31/15) = 112 * (15/31) ~ 54.2 mph.

12. sqrt of sqrt 600

600 = 100*6 so the square root is 10*sqrt(6). The square root of THAT is sqrt(10)*sqrt(sqrt(6)). Go ahead and take your best guess. As for me, I know that 625 is the square of 25 which is the square of 5. I'd say sqrt(600) is right between 24 and 25 but even so you're only going to take the square root of some number close to 25. You'll end up with something around 4.9, give or take 0.1.

13. 12000 loan, one place gives 8% rate another gives 10%. she pays $1100 so how much does she have at the 8% rate

What?

14. 3*sqrt5 / sqrt15 solve it

3*sqrt(5) / sqrt(3)sqrt(5)

Cancel out the sqrt(5)s and get 3/sqrt(3) = sqrt(3) ~ 1.73.

16. rectangle whose perimeter is 72 and width is 4 more than the sides/height. what is the area?

P = 72.
W = 4 + L.
P = 2W + 2L = 2(4+L) + 2L = 8 + 4L = 72.
L = 16
W = 20

Area = L*W = 320.

 

[War Eagle]

11. frog who has another pocket under the ectoderm notochord, what would it be?
gut, eye, neural organ
The only logical answer here is the eye because the retina of the eye is formed from two mesodermal pockets of the mesoderm and the lens is formed from the ectoderm. The only reason I am confused by the wording of the question is because it says “under the notochord” and the mesodermal pockets for the eyes are on the anterior side of the notochord, but I guess under could be on the anterior side. Whereas, the neural organ (brain) is formed from the ectoderm and the gut is formed from the endoderm.
15. liquid at room temp?
Cl, Br, F, I, CH3
I may be wrong but I believe the main reason that I2 is a liquid state at room temperature is because of its large molecular weight. I think its large atomic radius actually makes its intermolecular bonds weaker but the weight overrides this and keeps it from turning into a gas.

I just checked my histology book, and it says that the retina is formed from ectoderm. Do you have a better source?

 

[TexasDent]

I just checked my histology book, and it says that the retina is formed from ectoderm. Do you have a better source?

You are right I misunderstood the paragraph I read, I am using Schaum's, but it was actually saying that the eyes form from two pockets of the Forebrain in the ectoderm, not the mesoderm. Sorry about that.
I'm not sure what the answer would be...maybe neural organ? but I'm not sure this is not a very well written question.

 

[Dencology]

how is Iodine diatomic when the given formula is ICI3. the charge for Cl is usually -1 so you have three of them which makes it -3, now I would be +3 to balance it out? please correct me if i am wrong!

ccDNA is closed circular DNA which is what prokaryotes contain.

The charge on an Iodine molecule is 0 because Iodine is a diatomic molecule; therefore it is I2 and the charge on both cancels the other out making them Non Polar.

 

[smile101]

I just checked my histology book, and it says that the retina is formed from ectoderm. Do you have a better source?

I agree...the answer should be gut because when you look at the embrology pic, it shows that archenteron is underneath the notochord.

Br should be liquid.

charge on I in ICI3 should be -1 because all the halogens are -1 and it makes sense to have +4 on carbon

where are these questions from???
the decolorization one completely threw me off...if i had to guess, i'd say something that oxidizes it.

 

[smile101]

Here are the math ones from part 2:



8. log 2=.33, log 3=.44something, log 1500=?

log 1500 = log(100*15) = log(100) + log(15). Not sure how log(2) helps you here. log(100) = 2. log(15) = log(3*5) = log(3) + log(5). You'd need to know log(5) here for an exact answer. Otherwise you'd have to guess.

I think what he means here is log 1.5 x 10^3= 3+ log 1.5

3/2=1.5
therefore, 3+log 3/2 = 3+(log 3-log2)

3+ (0.44-0.33) = 3.11

 

[Streetwolf]

I think what he means here is log 1.5 x 10^3= 3+ log 1.5

3/2=1.5
therefore, 3+log 3/2 = 3+(log 3-log2)

3+ (0.44-0.33) = 3.11

Good catch! Missed that 🙂

 

[massumeh18]

these were from me...i typed up as much as i could remember from my exam back in january...if there are any errors that is why...i was so anxious that my recall ability was affected...i did not know anyone had posted them on here...