Why would ethanol evaporate more quickly than water?

Art-based Question Unit 3 Question 1

Part A

Diagram of Sodium Chloride. There is a positively charged sodium atom with eleven protons and ten electrons and a negatively charged chloride with 17 protons and 18 electrons. The two charged atoms are in closed proximity to each other.

This is an example of __________.

ANSWER:

Diagram of Sodium Chloride. There is a positively charged sodium atom with eleven protons and ten electrons and a negatively charged chloride with 17 protons and 18 electrons. The two charged atoms are in closed proximity to each other.

This is an example of __________.

nonpolar covalent bond
ionic bond
hydrogen bond
polar covalent bond

Art-based Question Unit 3 Question 2

Part A

Diagram of H2 (hydrogen gas). There are two hydrogen atoms. Each has 1 proton in the nucleus and there are 2 electrons in the middle between the two atoms and the electron orbital of each atom holds those same two electrons.

This is an example of __________.

ANSWER:

Diagram of H2 (hydrogen gas). There are two hydrogen atoms. Each has 1 proton in the nucleus and there are 2 electrons in the middle between the two atoms and the electron orbital of each atom holds those same two electrons.

This is an example of __________.

nonpolar covalent bond
hydrogen bond
ionic bond
polar covalent bond

Art-based Question Unit 3 Question 3

Part A

Diagram of six molecules of water. There are dotted lines connecting the neighboring water molecules. Each dotted line runs between the partially positive hydrogen of one water molecule to the partially negative oxygen of a neighboring water molecule.

The bonds between neighboring water molecules in the figure are __________.

ANSWER:

Diagram of six molecules of water. There are dotted lines connecting the neighboring water molecules. Each dotted line runs between the partially positive hydrogen of one water molecule to the partially negative oxygen of a neighboring water molecule.

The bonds between neighboring water molecules in the figure are __________.

hydrogen bonds
ionic bonds
nonpolar covalent bonds
polar covalent bonds

Lab Manual Unit 3 Pre-Lab Quiz Question 1

Part A

Which falls into the category of largest level of structural organization?

ANSWER:

Which falls into the category of largest level of structural organization?

organelle
atom
cell
molecule

Lab Manual Unit 3 Pre-Lab Quiz Question 2

Part A

What part of the atom is most critical for creating chemical bonds?

ANSWER:

What part of the atom is most critical for creating chemical bonds?

electrons
neutrons
nucleus
protons

Lab Manual Unit 3 Pre-Lab Quiz Question 3

Part A

Water molecules rely on ________ to hold them together.

ANSWER:

Water molecules rely on ________ to hold them together.

ionic bonds
polar covalent bonds
hydrogen bonds
nonpolar covalent bonds

Lab Manual Unit 3 Pre-Lab Quiz Question 4

Part A

The tendency for water molecules to stick or cling to another surface is called ________.

ANSWER:

The tendency for water molecules to stick or cling to another surface is called ________.

reactivity
adhesion
cohesion
solubility

Lab Manual Unit 3 Pre-Lab Quiz Question 5

Part A

Water is called ________ because most molecules will dissolve in it.

ANSWER:

Water is called ________ because most molecules will dissolve in it.

the multi-dissolving solute
the universal solvent
a solution
the organic solvent

Lab Manual Unit 3 Post-Lab Quiz Question 1

Part A

Two hydrogen atoms share electrons equally between each other, forming a molecule. What type of bond is this?

ANSWER:

Two hydrogen atoms share electrons equally between each other, forming a molecule. What type of bond is this?

hydrogen bond
ionic bond
nonpolar covalent bond
polar covalent bond

Lab Manual Unit 3 Post-Lab Quiz Question 2

Part A

Two water molecules are weakly attracted to each other when a slightly positive hydrogen atom in the first molecule is attracted to the slightly negative oxygen atom on the second molecule. What type of bond is this?

ANSWER:

Two water molecules are weakly attracted to each other when a slightly positive hydrogen atom in the first molecule is attracted to the slightly negative oxygen atom on the second molecule. What type of bond is this?

hydrogen bond
polar covalent
ionic
nonpolar covalent

Lab Manual Unit 3 Post-Lab Quiz Question 3

Part A

Which is an example of surface tension?

ANSWER:

Which is an example of surface tension?

hydrolysis reactions of water molecules and salts
tendency for evaporation on the surface of a solution
absorption of heat a the surface of a solution
cohesion of water molecules at the air/water boundary of the alveolus

Lab Manual Unit 3 Post-Lab Quiz Question 4

Part A

In a mixture of salt water, the salt is called the:

ANSWER:

In a mixture of salt water, the salt is called the:

solvent
substrate
solution
solute

Lab Manual Unit 3 Post-Lab Quiz Question 5

Part A

Why would ethanol evaporate more quickly than water?

ANSWER:

Why would ethanol evaporate more quickly than water?

Ethanol absorbs oxygen molecule more readily and turns into air.
Ethanol does not have as many hydrogen bonds holding the molecules together.
Water has stronger covalent bonds holding its molecules together.
Water does not absorb heat as quickly as ethanol.

Art-based Question Unit 3 Question 4

Part A

Diagram of pH scale from 0 to 14. There is increasing concentration of hydrogen ions shown as you approach 0. Lemon juice is at 2.5, vinegar is at 3, tomatoes are at 4.5, coffee is at 5, milk is at 6.5, pure water is at 7, blood is at 7.4, baking soda is at 8.5, ammonia is at 11, bleach is at 12.5.

The most acidic substance in the figure is __________.

ANSWER:

Diagram of pH scale from 0 to 14. There is increasing concentration of hydrogen ions shown as you approach 0. Lemon juice is at 2.5, vinegar is at 3, tomatoes are at 4.5, coffee is at 5, milk is at 6.5, pure water is at 7, blood is at 7.4, baking soda is at 8.5, ammonia is at 11, bleach is at 12.5.

The most acidic substance in the figure is __________.

lemon juice
pure water
bleach
milk

Lab Manual Unit 3 Pre-Lab Quiz Question 6

Part A

The pH scale:

ANSWER:

The pH scale:

measures the salt concentration of a solution
defines neutral as a pH of 5
measures the hydrogen ion concentration of a solution
ranges from 1 to 7

Lab Manual Unit 3 Pre-Lab Quiz Question 7

Part A

Which pH value is the MOST acidic?

ANSWER:

Which pH value is the MOST acidic?

seven
two
five
twelve

Lab Manual Unit 3 Pre-Lab Quiz Question 8

Part A

A solution with a pH of 13 is called:

ANSWER:

A solution with a pH of 13 is called:

alkaline
covalent
acidic
neutral

Lab Manual Unit 3 Pre-Lab Quiz Question 9

Part A

What happens to blood hydrogen ion levels as carbon dioxide levels rise?

ANSWER:

What happens to blood hydrogen ion levels as carbon dioxide levels rise?

They go down.
They go up.
There is no change.

Lab Manual Unit 3 Post-Lab Quiz Question 6

Part A

What tool would help you determine the pH of urine?

ANSWER:

What tool would help you determine the pH of urine?