2nd lecture Flashcards

1
Q

Organic molecules are defined as molecules that contain:

A

carbon and hydrogen atoms

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2
Q

Molecular formula:

A

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

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3
Q

Hydrogen bonds:

A

intermolecular bonds formed between polar molecules

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4
Q

Polar:

A

unequal sharing of electrons

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5
Q

Nonpolar:

A

equal sharing of electrons

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6
Q

Water is a _____ molecule

A

polar

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7
Q

Substances that dissolve in water are called

A

solutes (nonpolar)

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8
Q

Water is an example of:

A

an inorganic molecule

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9
Q

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

A

False

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10
Q

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

A

electrons

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11
Q

Substance that dissolves other substances:

A

solvent

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12
Q

Water is known as the universal _____

A

solvent

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13
Q

Cohesion:

A

ATTRACTION BETWEEN WATER MOLECULES TO OTHER WATER

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14
Q

Adhesion:

A

ATTRACTION BETWEEN HYDROGEN ATOMS OF WATER MOLECULES AND OTHER SURFACES

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15
Q

Surface tension:

A

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)

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16
Q

Specific heat:

A

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

17
Q

Heat of vaporization:

A

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