Thermochemistry

Question 1

The amount of heat required to change the temp of an object by exactly 1 C

Answer 1

Heat capacity

Question 2

In any chemical or physical process, energy is neither created nor destroyed

Answer 2

Law of conservation of energy

Question 3

A unit of heat energy

Answer 3

Calorie

Question 4

A form of energy that always flows from a warmer object to a cooler object

Answer 4

Heat

Question 5

A process that loses heat to its surrounding

Answer 5

Exothermic process

Question 6

A device used to measure the amount of heat absorbed or released during chemical physical processess

Answer 6

Calorimeter

Question 7

A process that absorbs best from its surroundings

Answer 7

Endothermic process

Question 8

The capacity to do work or to supply hear

Answer 8

Energy

Question 9

The amount of heat required to raise the temperature of 1 gram of a substance by 1 C

Answer 9

Specific heat

Question 10

Energy released

Answer 10

Exothermic

Question 11

Energy absorbed

Answer 11

Endothermic

Question 12

Specific heat of water

Answer 12

4.18

Question 13

When doing a hess’s law question and you flip the equation you must do what to the delta h

Answer 13

Multiply it by -1

Question 14

one kilocalorie equals how many joules

Answer 14

4,184

Question 15

How many joules are in one calorie

Answer 15

4.184

Question 16

What is 1 atm in celucius and Kelvin and kpa

Answer 16

25 celcius
298 Kelvin
101 kpa

Question 17

In an open system what can enter

Answer 17

Energy and matter can flow into and out of the system

Heat energy can also flow in and out of the system

Question 18

In a closed system what can be exchanged

Answer 18

NO MATTER OR ENERGY CAN BE EXCHABGED

Heat energy can be transferred in and out

Question 19

In an isolated system what can be exchanged

Answer 19

NOTHING CAN ENTER AND NOTHING CAN LEAVE

Question 20

In an isolated system the internal energy stays

Answer 20

Constant

Question 21

For heat of formation, when balancing the equation do you try to increase the product to match the reactant or use fractions
Ex 2H2 + O2 —-> 2H2O
. Or
H2 + 1/2O2 ——> H2O

Answer 21

Use fractions! Remember we can only use one mole of the substance so don’t be afraid to use fractions

Question 22

When a bond breaks energy is ________

Answer 22

Absorbedb

Question 23

When a bond is formed energy is ________

Answer 23

Released

Question 24

a calorimeter is what type of system

Answer 24

Isolated

Question 25

Amount of energy required to change phase

Answer 25

Enthalpy

Question 26

The molar heat of fusion

Answer 26

Heat absorbed by one mole of substance melting

Question 27

What is the equation and unit for heat capacity

Answer 27

C(subscript) h = q/ delta T

Unit: J/ C (degrees) or any variation with kilojoules and Kelvin and stuff