Thermochemistry

Question 1

It refers to the average kinetic energy of particles.

Answer 1

Temperature

Question 2

The part of the universe being studied or to
which attention is focused.

Answer 2

System

Question 3

A process in which a system absorbs heat
from its surroundings.

Answer 3

Endothermic process

Question 4

Which is an example of an endothermic process?

Boiling of water

Melting of ice

Answer 4

Melting of ice

Question 5

It is the capacity to do work or supply heat.

Answer 5

Energy

Question 6

The rest of the universe
outside the system.

Answer 6

Surroundings

Question 7

Types of Systems

Allows the exchange of
both energy (heat) and
matter with surroundings.

Answer 7

Open System

Question 8

Types of Systems

Allows the exchange of
energy (heat) only with
surroundings.

Answer 8

Closed System

Question 9

Types of Systems

Allows neither energy nor
matter to be exchanged
with surroundings.

Answer 9

Isolated System

Question 10

Transfers from object with
higher temperature to object
with lower temperature.

Answer 10

HEAT

Question 11

It is a type of reaction if the system absorbs
heat from its surroundings.

Answer 11

Endothermic Process

Question 12

It is a type of reaction if the system gives
off heat to the surroundings.

Answer 12

Exothermic Process

Question 13

Endothermic or Exothermic

Condensation

Answer 13

Exothermic

Question 14

Endothermic or Exothermic

Evaporation

Answer 14

Endothermic

Question 15

Endothermic or Exothermic

Burning of coal

Answer 15

Exothermic

Question 16

Endothermic or Exothermic

Photosynthesis

Answer 16

Endothermic

Question 17

What Law?

The total energy of a closed system is neither
created nor destroyed; but can be
transformed from one form to another.

Answer 17

First Law of
Thermodynamics

Question 18

is the capacity to do work.

Answer 18

Energy

Question 19

In chemical reaction, __________ energy may be released and converted to heat.

Answer 19

Potential

Question 20

What Law?

In interactions between system and
surroundings, the total energy remains
constant or energy is not created nor
destroyed.

the heat lost by the
surroundings is gained by the
system, and vice-versa.

Answer 20

Law of Conservation of Energy

Question 21

What Law?

deals with the interconversion of energy into two forms, work, and heat.

Answer 21

First Law of Thermodynamics

Question 22

First Law of Thermodynamics=
In any process, the change in energy of a
system is ______ to the heat absorbed by the system and the work done on it

Answer 22

equal

Question 23

Positive (+) Δesys = _____________ process.

Answer 23

Endothermic

Question 24

Negative (-) Δesys = _____________ process.

Answer 24

Exothermic

Question 25

amount of energy required to raise the temperature of a sample by 1oC.

Answer 25

Heat capacity (C)

Question 26

amount of energy required to raise one gram of a substance by 1oC.

Answer 26

Specific Heat (c)

Question 27

The amount of heat absorbed or released by a chemical reaction at a constant atmospheric pressure.

Answer 27

Enthalpy (H)

Question 28

Enthalpy is an ____________ property.

Answer 28

extensive

Question 29

The “sea level” reference point for all enthalpy expressions is called the _________________

Answer 29

standard enthalpy of formation (ΔHof)

Question 30

Substances are said to be in the standard state at __ atm, hence the term “standard enthalpy.”

Answer 30

1

Question 31

The standard enthalpy of formation of any element in its most stable form is ______.

Answer 31

zero

Question 32

Is the heat change that results when 1 mole of the compound is formed from its elements at a pressure of 1 atm.

Answer 32

standard enthalpy of formation (ΔHof)

Question 33

ΔH is positive = _____________ process.

Answer 33

endothermic

Question 34

ΔH is negative = _____________ process

Answer 34

exothermic

Question 35

is the enthalpy of a rxn carried out at 1 atm

Answer 35

ΔH rxn

Question 36

stoichiometric coefficient for reactants

Answer 36

m

Question 37

stoichiometric coefficient for products

Answer 37

n

Question 38

What Law? The value of enthalpy (ΔH) for a reaction is the same whether it occurs in one step or in series of steps.

Answer 38

Hess’s Law

Question 39

What rule of Hess' Law Rule 1 Rule 2 Rule 3 Enthalpy is an extensive property; it depends on the amount of reactants and products

Answer 39

Rule 1

Question 40

What rule of Hess' Law Rule 1 Rule 2 Rule 3 ΔH for a forward rxn is equal in magnitude but opposite in sign to its reverse rxn

Answer 40

Rule 2

Question 41

What rule of Hess' Law Rule 1 Rule 2 Rule 3 ΔH for reaction is the same whether it occurs in one step or in a series of steps

Answer 41

Rule 3