Question

Problem 1:
The melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10°C, –11°C, –17°C, and –2°C. Based on this information, how might you separate one type of oil from the rest in a mixture of all four?

a. cooling in a freezer

b. liquid chromatography

c. simple distillation

d. paper chromatography

Answer 1

PRoblem 2:

Which of the following is a mixture?
a. oxygen

b. air

c. nitrogen

d. carbon dioxide
***I think it is AIR (B) am i right on this one??

Answer 2

I'd use a freezer. Check frequently to separate solid from liquid, one at a time, as they reach their freezing points, lowest to highest.

Answer 3

SO i'll just enter those two for now, so things don't get confusing :) hahaa

Answer 4

Oh... couldn't problem 1's answer also be simple distillation??

Answer 5

@hba?? what do u think??

Answer 6

I think i am sleepy

Answer 7

or are the boiling points not separated enough??? so it has to be cooling in a freezer???

Answer 8

lol

Answer 9

Yes cooled in a freezer

Answer 10

okay...and what about problem 2?

Answer 11

Do you know soil is a mixture

Answer 12

yeah... so is AIR the answer??

Answer 13

since it is made up of different components???

Answer 14

Yes air is a mixture You dont have to explain me things

Answer 15

@hba and here is another problem....
Problem 3:
Which method would you use to separate silt from water

a. filtration

b. gas chromatography

c. distillation

d. electrolysis
****I think it is A. filtration... am i right??
Oh and yeah sorry! but yay!! I was right :)

Answer 16

Yeah right

Answer 17

Oh and Problem 4:

In a paper chromatography chamber, which of the following could be the mobile phase?

a. paper

b. air

c. alcohol

d. plastic plate
**I think it is C. alcohol :)
And yay!! :)

Answer 18

@hba and problem 5:

Ali runs a paper chromatography experiment using the same ink, but three different solvents. Solvent A separates the components into three bands, solvent B separates it into two bands, and solvent C does not separate the ink. What should Ali conclude?

A. Solvent A was the best mobile phase.

B. The ink was a pure substance.

C. The ink was a mixture, but only in solvents A and B.

D. Solvent C was a good mobile phase.
***I think the answer to this one is A. Solvent A was the best mobile phase.... Am i right?? :)

Answer 19

Alcohol (it climbs up the paper)

Answer 20

cool! did i get problem 5 right?

Answer 21

Solvent A was the best mobile phase

Answer 22

Yay! and i don't get this one...
Problem 6:

Acetylene burns in oxygen and produces carbon dioxide, water, heat, and light. Which of the following statements is true?

A. Acetylene and oxygen changed chemically and released energy.

B. Acetylene and oxygen changed physically and released energy.

C. Acetylene and oxygen changed chemically and absorbed energy.

D. Acetylene and oxygen changed physically and absorbed energy.

Answer 23

@hba... do you understand that one??

Answer 24

nvm thanks for all the help tho! :)

Answer 25

WELCOME I WAS BUSY lol