Question

#1: Of these four liquids, which is the most viscous?

A. H2O

B. CCl4

C. C2H12O6

D. Hg

**not too sure.. i think its either C or D... :/

Answer 1

#2: Increasing the total pressure above a liquid raises the boiling point. Which of the following best explains why?

A. The number of molecules with high kinetic energies is reduced.

B. The number of molecules with high kinetic energies is increased.

C. The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is raised.

D. The amount of kinetic energy required for the molecules to break free of the intermolecular forces in the liquid is decreased.

**my answer: C

not too sure tho.. what do u think??

Answer 2

#3: Intermolecular forces allow which of the following substances to be the least fluid?

A. glass

B. mercury

C. rubber

D. calcite

**ym answer: D. calcite

is that right? cuz calcite is a solid?

Answer 3

#4: A 3.0 L container holds a sample of hydrogen gas at 150 kPa. If the pressure increases to 2 atm and the temperature remains constant, what will the volume be?

A. 4.50 L

B. 2.25 L

C. 0.44 L

D. 0.22 L

**i don't get this one at all :(

Answer 4

I'm thinking it might be mercury. It is pretty thick. What is C? I don't recognize it.

Answer 5

#5: Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, and the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 × 10^4 kPa, then what is the partial pressure of helium?

A. 2.07 × 10^3 kPa

B. 1.04 × 10^4 kPa

C. 8.3 × 10^3 kPa

D. 2.07 × 10^4 kPa

**my answer: D

but I'm not too sure on it... what do u think?

Answer 6

I agree that number 2 is C

Answer 7

and for 1 i don't really know what it is... I've never heard of it... at first i thought it was glucose, but that's not glucose... i think... lol

and yay for #2!

Answer 8

I agree with 3 also

Answer 9

awesome! :) so would #1 be mercury? ;/

Answer 10

# 4 Isn't it P1V1=P2V2?

Answer 11

So I think B

Answer 12

p1v1=p2v2 is one of the equations :)

so it's B then? B. 2.25 L ?? and u just insert the values?

Answer 13

# 5. Why would all the pressure be due to the helium when there are other gases present.

Answer 14

wait what? :/ haha sorry i don't quite get what u mean :/

Answer 15

What I mean is that it says the total pressure of all the gases in the container is 2.07 x 10^4. There are 3 different gases in the container and you put that all the pressure....2.07x10^4 is the answer you chose...is due to just one of the gases.

Answer 16

So I'm thinking if 50% is helium then 50% or 1/2 of the pressure should be due to the helium

Answer 17

ohh i see.. so it should be B. 1.04 × 10^4 kPa???

Answer 18

I googled the formula in the first question and it said it is in error.

Answer 19

That's what I think for 5...B

Answer 20

So could there possibly be a typo in that formula?

Answer 21

no there's no typo... so it's B then? like the best choice?

Answer 22

You think number 1 is B? Carbon Tet? I think it is the least viscous

Answer 23

its asking for most viscous tho :/

Answer 24

So why would it be carbon tetrachloride? It is really runny

Answer 25

wait what?? sorry i'm not quite following.... i thought it was probably D. Hg? for mercury? ;/

Answer 26

I think number 1 is either C or D but I don't know which one.

Answer 27

okay! that's fine! :) thanks!! :)

do u think u can help with some more? :) if i post in a new post? :D

Answer 28

I might be able to although I don't remember very much chem

Answer 29

okay!! any help is good!! :D ima post in a new post... one sec!

Answer 30

okay!! any help is good!! :D ima post in a new post... one sec!