Ch 7 Lec 1 - Thermochemistry

Question 1

part of the universe chosen to be studied (large or small)

Answer 1

system

Question 2

part of the universe outside the system but with which the system interacts

Answer 2

surroundings

Question 3

system that freely interacts with surroundings and can exchange both matter and energy with surroundings

Answer 3

open system

Question 4

system that can exchange energy but not matter with the surroundings

Answer 4

closed system

Question 5

system that does not interact at all with the surroundings

Answer 5

isolated system

Question 6

the capacity to do work

Answer 6

energy

Question 7

done when a force acts on an object through a distance

Answer 7

work

Question 8

energy of a moving object

Answer 8

kinetic energy

Question 9

stored energy or energy resulting from a condition, position, or composition (associated with forces of attraction or repulsion)

Answer 9

potential energy

Question 10

kinetic energy that is associated with random molecular motion; proportional to the temperature of a system

Answer 10

thermal energy

Question 11

the transfer of thermal energy or energy transfer between a system and its surroundings as a result of a temperature difference

Answer 11

heat

Question 12

molecules of the warm body lose KE through collisions to the colder body which causes a blank flow

Answer 12

heat

Question 13

heat flows until the average blanks are the same

Answer 13

kinetic energies

Question 14

si unit of heat

Answer 14

joules

Question 15

other units of heat

Answer 15

calories (cal), kilocalories (Cal)

Question 16

quantity of heat required to change the temperature of a substance by 1 degree Celsius

Answer 16

heat capacity

Question 17

if the system is one mole of a substance (J/mol)

Answer 17

molar heat capacity

Question 18

quantity of heat required to change the temp of 1 gram of a substance by 1 degree Celsius

Answer 18

specific heat capacity

Question 19

in interactions between a system and its surroundings, the total energy remains constant

Answer 19

law of conservation of energy

Question 20

energy associated with chemical bonds and intermolecular attractions

Answer 20

chemical energy

Question 21

quantity of heat exchanged between a system and its surroundings when a chemical reaction takes place (at constant temperature)

Answer 21

heat of reaction

Question 22

reaction that gives off heat to the surroundings and produces a temperature change in surroundings (in isolated system, the temperature of system increases) (negative)

Answer 22

exothermic

Question 23

reaction that gains heat from the surroundings (isolated system produces a temp decrease) (positive)

Answer 23

endothermic reaction

Question 24

used as a rxn vessel to determine qrxn

Answer 24

calorimeter

Question 25

a bomb calorimeter is a blank system

Answer 25

isolated

Question 26

when combustion occurs, chemical energy is converted to thermal energy and the temperature of the water blanks in a bomb calorimeter

Answer 26

increases