2nd lecture

Question 1

Organic molecules are defined as molecules that contain:

Answer 1

carbon and hydrogen atoms

Question 2

Molecular formula:

Answer 2

number and types of atoms forming a molecule (e.g. H2CO3)

Question 3

Hydrogen bonds:

Answer 3

intermolecular bonds formed between polar molecules

Question 4

Polar:

Answer 4

unequal sharing of electrons

Question 5

Nonpolar:

Answer 5

equal sharing of electrons

Question 6

Water is a _____ molecule

Answer 6

polar

Question 7

Substances that dissolve in water are called

Answer 7

solutes (nonpolar)

Question 8

Water is an example of:

Answer 8

an inorganic molecule

Question 9

T or F: The high specific heat of water means that we only lose a small amount of heat when the sweat on our skin evaporates

Answer 9

False

Question 10

The amount of which subatomic particle is different between an atom and its ion?

Answer 10

electrons

Question 11

Substance that dissolves other substances:

Answer 11

solvent

Question 12

Water is known as the universal _____

Answer 12

solvent

Question 13

Cohesion:

Answer 13

ATTRACTION BETWEEN WATER MOLECULES TO OTHER WATER

Question 14

Adhesion:

Answer 14

ATTRACTION BETWEEN HYDROGEN ATOMS OF WATER MOLECULES AND OTHER SURFACES

Question 15

Surface tension:

Answer 15

INWARD PULLING OF COHESIVE FORCES. HAPPENS BECAUSE WATER HAS 3 HYDROGEN BONDS, RATHER THAN 4, THUS ALLOWING WATER TO HAVE AN “END POINT” (ALLOWING WATER TO BEAD)

Question 16

Specific heat:

Answer 16

AMOUNT OF ENERGY REQUIRED TO INCREASE TEMPERATURE OF 1 GRAM OF SUBSTANCE BY 1 DEGREE OF CELSIUS—MEASURE IN CALORIES

Question 17

Heat of vaporization:

Answer 17

AMOUNT OF ENERGY REQUIRED TO CHANGE MOLECULES FROM LIQUID TO GAS FOR 1 GRAM OF SUBSTANCE