First Law of Thermodynamics

What does the heat capacity of an object measure?

• the amount of energy required to change the temperature of an object
• the total amount of energy an object can store
• the thermal potential energy of the object
• the amount of work done by the object
• the amount of energy required to melt a solid object

Tags

NGSS.HS-PS3-4

When applying the first law of thermodynamics to a system, when is heat a positive quantity?

• when the system does work
• when the system has work done on it
• when the system absorbs heat
• when the system loses heat
• when no work is done either on the system or by the system

Tags

NGSS.HS-PS3-4

The product of the pressure and volume of a system  has the same SI units as which one of the following choices?

• force
• work
• acceleration
• momentum
• impulse

25 °C in kelvins

• 298.45 K

• 248.15 K

• 298.15 K

Calculate the volumetric flow of a system feed by water with a mass flow of 3 kg/s.

• 3000 kg/s

• 0.003 kg/s

• 3003 kg/s

Calculate the heat transfer to the environment if the system produce a work of 45 kJ and receive 9 kJ in the way of heat. The enthalpy difference of the system is equal to 55 kJ.

• 1

• 91

• 19

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A 7.50 liter sealed jar at 18 °C contains 0.125 moles of oxygen and 0.125 moles of nitrogen gas. What is the pressure in the container?

• 7.38 atm

• 0.796 atm

• 0.684 atm

• 0.398 atm

What is 50 °C in Kelvin?

• 223
• 323
• 100
• 50

What does R stand for

• Ideal gas constant

• Real gas constant

• Temperature constant

• Ideal gas law

Which of the following equations represents the Ideal Gas Law?

• 
• 
• 
•