solubility/miscibility

Question 1

In what container will you mix solids and solvents to test solubility?

Question 1

In what container will you mix solids and solvents to test solubility?

Answer 1

test tube

Question 2

in what container will you mix liquids to test miscibility

Answer 2

test tube

Question 3

What is the name of the device you will use in this lab to measure volumes of liquids accurately?
transfer pipette
micropipette
graduated cylinder
beaker

Answer 3

Micropipette

Question 4

You are allowed to lay the micropipette on the lab bench with liquid in the tip.
True
False

Answer 4

False

Question 5

You can damage the pipette by turning the dial to greater than 1000.
True
False

Answer 5

True

Question 6

You can damage the pipette by dropping it on the floor.
True
false

Answer 6

true

Question 7

If you will dispense more of the same liquid then use the same tip, if you will next work with a different liquid, eject the used tip and replace with a new one.

True
False

Answer 7

true

Question 8

Based on your experiments on solubility, which of the following solid-solvent combination is soluble?
Biphenyl-Water
Malonic acid-Diethyl ether
Benzophenone-Hexane
Biphenyl-Hexane

Answer 8

Biphenyl-Hexane

Question 9

Based on your experiments on miscibility, which of the following solvent-solvent combination is immiscible?
Water-Diethyl ether
Acetone-Diethyl ether
Water-Acetone

Answer 9

Water-Diethyl ether

Question 10

What does the ‘inter’ part of the word mean in the term intermolecular forces?

INTER means BETWEEN two separate molecules
INTER means WITHIN one particular molecule

Answer 10

INTER means BETWEEN two separate molecules

Question 11

Below is a schematic representation of the molecules for forming a solution of the solid biphenyl in the liquid hexane.

Based on your experimental observations and the picture below, select the correct statements from the following
The IMF broken in biphenyl is induced dipole
The IMF broken in hexane is hydrogen bonding
The IMF formed in solution is induced dipole
The energy cost of breaking IMFs (to dissolve biphenyl in hexane) is small
The energy gain of making IMFs (in solution) is large
Entropy favors dissolving biphenyl in hexane
Biphenyl is INSOLUBLE in hexane

Answer 11

imf is broken in biphenyl is induced dipole
imf formed in solution is induce dipole
energy cost of breaking imf to dissolve biphenyl in hexane is small
entropy favord dissolving biphenyl in hexane

Question 12

Why does energy have to be supplied to a chemical in order to break the IMFs between the molecules in that chemical?
Breaking the IMFs lowers the energies of the electrons
Breaking the IMFs raises the energies of the electrons
Breaking IMFs have nothing to do with the energy of electrons!

Answer 12

Breaking the IMFs raises the energies of the electrons

Question 13

Why is energy released when IMFs form between molecules as they approach each other?
Making IMFs lowers the energy of electrons
Making IMFs raises the energy of electrons
Making IMFs have got nothing to do with the energy of electrons!

Answer 13

Making IMFs lowers the energy of electrons

Question 14

How many microliters are there in 0.36 mL?
3600

360
36
3.6

Answer 14

360

Question 15

How many milliliters are there in 2560 microliters?
256.0
25.6
2.56
0.256

Answer 15

2.56

Question 16

how do you find the number of molecules

Answer 16

convert to mL if needed
used density=mass/volume
use mass to determine moles
convert number of moles to number of moleucles (*avogrados number)