Energy

Question 1

energy

Answer 1

ability to work or produce heat

Question 2

heat

Answer 2

energy moving from one place to another always cold to hot)

Question 3

temperature

Answer 3

a measure of kinetic energy of the particles in a substance

Question 4

endothermic

Answer 4

a description of a process that absorbs heat (+), breaks bonds, energy entered system and left surroundings

Question 5

exothermic

Answer 5

a description of a process that gives off heat (-), makes bonds, energy left system and entered surroundings

Question 6

calorie

Answer 6

energy required to heat one gram of water by 1 degree Celsius

Question 7

Calorie

Answer 7

a nutritional calorie, equal to 1000 cal

Question 8

kilocalorie

Answer 8

equivalent to 1000 calories

Question 9

heat capacity

Answer 9

amount of heat required to raise the temperature of 1 gram of a substance by 1 degree celsius

Question 10

symbol: q

Answer 10

heat

Question 11

Enthalpy

Answer 11

(Delta H) the total energy of the system, -H: exothermic, +H: exothermic

Question 12

open system

Answer 12

can exchange both energy & matter

Question 13

closed system

Answer 13

can only exchange energy with the surroundings, not matter

Question 14

isolated system

Answer 14

cannot exchange either energy or matter with the surroundings

Question 15

1st Law of Thermodynamics

Answer 15

Euniverse = 0 = Esystem + Esurrodunings OR Esystem = -Esurroundings

Question 16

2nd Law of Thermodynamics

Answer 16

when 2 objects are in thermal contact, heat is always transferred from the object at a higher temperature tot he object at a lower temperature until the 2 objects are at the same temp.

Question 17

sign of delta H on the product side is…

Answer 17

negative, energy is released

Question 18

sign of delta H on the reactant side is…

Answer 18

positive, energy is absorbed

Question 19

Hess’s Law

Answer 19

when a series of equations are added together, their enthalpy changes are also added