BJU Press- Biology chapter 2

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28 Terms

1

what affects reactions by speeding them up and slows down activation energy?

catalyst

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2

universal solvent

water

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3

what kind of reaction absorbs heat?

endothermic reaction

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4

what kind of energy is required to activate a reaction?

activation energy

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5

what kind of reaction needs a big amount of activation energy?

exothermic reaction

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6

living things depending on energy's tendency to disperse

entropy

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7

a uniform mixture

solution

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8

the process by which one substance is broken up into smaller pieces, usually by ions, by another substance (water)

dissolving

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9

a substance that dissolves in water to form hydrogen ions

acid

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10

a substance that dissolves in water to form hydroxide ions

base

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11

the dispersion of substances through brownian motion

diffusion

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12

what we began with

reactants

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13

what we ended up with

products

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14

a class of catalysts that naturally occurs on living things

enzymes

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15

The ability to do work or cause change

energy

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16

energy of motion

kinetic energy

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17

stored energy

potential energy

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18

first law of thermodynamics (law of conservation of energy)

Energy cannot be created or destroyed

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19

second law of thermodynamics

Whenever energy is used some of it is rendered unusable

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20

surface of the enzyme

Active site

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21

The molecule that the enzyme will bind with

substrate

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22

Attraction between molecules of the same substance

cohesion

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23

One of the forces that draws water move through the vessels of its stems and leaves

adhesion

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24

A molecule with charged poles is said to be

Polar molecule

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25

Difference between the numbers of one type of molecule in two adjacent areas

concentration gradient

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26

A barrier that allows passage of all molecules

permeable

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27

They will permit the water molecules to pass through but will not permit the larger molasses to pass through

Semipermeable membrane

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28

diffusion of water molecules through a semipermeable membrane

osmosis

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