1st law of thermodynamics

The 1st law of Thermodynamics

• Energy can not be created or destroyed. It just changes forms.

• Energy can only be created by the sun

• Some energy is lost to the environment.

Tags

NGSS.MS-PS3-5

1200 J of heat are added to a sample of gas while 400 J of work is done by the gas. What is the change in internal energy of the gas?

• 800 J

• 1600 J

• -800 J

• -1600 J

Tags

NGSS.HS-PS3-1

What does the "U" stand for the formula ∆U = Q + W

• Heat
• Temperature
• Work
• Internal energy

500 J of energy is applied to a gas, if 200J of work is done by the gas. What is the change of internal energy in calories?

• 300cal

• 71.7cal

• 700cal

• 167.4cal

Tags

NGSS.HS-PS3-1

The internal energy of a system decreases by 40cal. What work is done by the gas, if the system absorbs 150J of heat?

• 317.2J

• 17.2J

• 190J

• 110J

Tags

NGSS.HS-PS3-1

The internal energy of a system increases by 50cal while 350J of work is done by a gas. Determine the change in heat .

• 559J

• 400J

• 141J

• 300J

Tags

NGSS.HS-PS3-4

if 600J of heat is needed to increase the internal energy from 15cal to 45cal. What work will the system produce?

• 474.6J

• 570J

• 535.4J

• 630J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

40J of work is done by a gas when the system has an increase in internal energy of 125J. What energy is needed to do so?

• 165J

• 85J

• Can´t be possible

• 165Cal

Tags

NGSS.HS-PS3-1

1234 J are how many calories

• 1234cal

• 295.21cal

• 5158.12cal

• 4321cal

1234cal are how many joules

• 4321J

• 5158.12J

• 295.21J

• 1234J