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energy

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Biology

9th

20 Terms

1

energy

The ability to do work or cause change

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2

examples of different forms of energy

-chemical -mechanical -thermal -electrical -kinetic -potential (stored energy)

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3

free energy

the energy available in a system for work

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4

chemical equations

represent chemical reactions

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5

reactants and products

-reactants are shown on left side of the equation, products on the right. -in reactions the amount of product must equal the amount of reactants

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6

Equilibrium

reached when both the reactants and products are made at the same rate

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7

bond energy

the energy needed to break a bond between two atoms

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8

where does most of an organism's energy come from?

sugar in foods

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9

exothermic/exergonic reactions

release more energy than it absorbs

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10

endergonic/endothermic reactions

store energy

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11

what are most reactions in cells?

endergonic

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12

activation energy

energy needed to start a reaction

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13

catalysts

-lower the amount of activation energy needed -called enzymes, and are usually proteins -often end with suffix '-ase'

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14

properties of enzymes

-they speed up a reaction by lowering the activation energy -very specific -proteins -may work on 1 or 2 substrates at the most -reusable -work by induced fit -adversely effected by temperature

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15

define solution

a mixture in which 2 or more substrates are uniformly distributed in another substance.

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16

solute

is dissolved in the solvent in a solution

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17

water

the universal solvent

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18

When does a solution become saturated?

when no more solute will dissolve

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19

aqueous solutions

have water as the solvent & are important to LIFE

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20

denature

when enzymes come apart & can no longer function

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