First Law of Thermodynamics

Question 1

states that energy cannot be created or destroyed but can only be transformed or changed from one form to another

Answer 1

First Law

Question 2

exists in numerous forms such as thermal, mechanical, electric, chemical and nuclear

Answer 2

energy

Question 3

can be considered a form of energy

Answer 3

mass

Question 4

Two distinct forms energy can be transferred

Answer 4

heat, work

Question 5

For a controlled volume, energy can also be transferred by _______.

Answer 5

mass flow

Question 6

Without it, there can be no work or heat flow that can happen.

Answer 6

energy

Question 7

unit of energy in SI system and English system

Answer 7

Joules, BTU

Question 8

amount of energy required to apply a force of 1 Newton over a distance of 1 meter

Answer 8

1 Joule

Question 9

amount of energy required to increase the temperature of 1 pound water by 1 degree Fahrenheit

Answer 9

BTU

Question 10

Energy that a system possesses as a result of its elevation in a gravitation field; in simple terms, the energy due to height of a system

Answer 10

potential energy

Question 11

Energy that a system possesses as a result of its motion relative to some reference frame

Answer 11

kinetic energy

Question 12

energy stored in a system in a microscopic scale

Answer 12

internal energy

Question 13

Multiplying it by the mass gives us the internal energy U

Answer 13

specific internal energy u

Question 14

defined as the form of energy that is transferred between two systems (or a system and its surroundings) by virtue of a temperature difference

Answer 14

heat

Question 15

A process where there is no heat transfer

Answer 15

adiabatic process

Question 16

Two Ways a Process is Adiabatic

Answer 16

• system is well insulated
• both system and surrounding are at same temperature

Question 17

When heat is added to the body or system, Q is _____.

Answer 17

positive

Question 18

When heat is rejected by the body or system, Q is _____.

Answer 18

negative

Question 19

energy interaction between a system and its surroundings

Answer 19

work

Question 20

energy transfer associated with a force acting through a distance

Answer 20

work

Question 21

If work is done by the system, it is _____.

Answer 21

positive

Question 22

If work is done on the system, it is _____.

Answer 22

negative

Question 23

Work of a non-flow system occurs in a _______ system

Answer 23

closed

Question 24

work done in pushing a fluid across a boundary, usually into or out of a system

Answer 24

flow work or flow energy

Question 25

Work of a flow system occurs in an _______ system

Answer 25

open

Question 26

used to combine the change in internal energy with this flow work, to make calculations more convenient

Answer 26

enthalpy

Question 27

defined as a region in space that is under consideration; contains mass or a thermodynamic substance

Answer 27

thermodynamic system or control volume

Question 28

has specific boundaries that separate it from the external effects of the environment

Answer 28

thermodynamic system or control volume

Question 29

Systems where energy (heat and work) and mass cross the system
boundary

Answer 29

Open Systems (Steady Flow Systems)

Question 30

Systems where energy (heat and work) can cross the system boundary but not mass

Answer 30

Closed Systems (Non-Flow Systems)

Question 31

Systems where both energy (heat and work) and mass cannot cross
the system boundaries; totally isolated by the environment

Answer 31

Isolated Systems