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Flashcards in Chapter 10 Deck (21):
1

nonmechanical energy

the energy possessed by microscopic particles

2

energy

the ability to do work

3

work

when an object moves in response to a force applied to the object

4

kinetic energy

energy of motion

5

potential energy

stored energy

6

temperature

based on the sensations of hot and cold. it is a measurement of the kinetic energy of the particles in an object

7

heat

a form of nonmechanical energy

8

specific heat

the amount of energy required to raise 1 gram of a substance to 1 C

9

6 forms of nonmechanical energy

chemical, electrical, electromagnetic (light), sound, magnetic, and heat

10

is temperature a measure of heat

no, heat is a form of nonmechanical energy, but temperature is a measure of the average kinetic energy in an object based on motion

11

C to K

+ 273°

12

calorimeter

a reaction chamber surrounded by a known mass of water

13

law of conversation of energy

energy is neither created nor destroyed during a chemical change. it can be converted from one form to another

14

work equation

work = force x distance

15

unit for energy

joule (J)

16

exothermic

releases energy into surrounding - burning, freezing, condensation - negative delta H, Hr > Hp

17

endothermic

absorbs heat energy - cold pack, boiling, melting - delta H is positive, Hr

18

delta H

enthalpy / heat energy

19

for determining how much heat is required, the specific heat, and final temperature

Q = M x (delta T) x Cp
Heat = Mass x Change in temp x Specific heat

Q lost = Q gained
2 substances combined eventually become the same heat/temp

20

how much heat is released using equation

4 Fe + 3 O2 = 2 Fe2O3
delta H = -1653 KJ
10.0 g Fe x (1 mole Fe / 55.8 g Fe) x (1653 KJ / 4 mole Fe) -
dimensional analysis

21

mechanical energy

the energy possessed by macroscopic particles