What is the change in internal energy (ΔE) for a system undergoing an endothermic process where 15.6 kJ of heat flows into the system and 1.4 kJ of work is done on the system?

• A) 14.2 kJ

• B) 17.0 kJ

• C) 14.2 kJ

• D) 16.2 kJ

Tags

NGSS.HS-PS3-1

What happens to a gas when it is heated and causes a piston to move in a cylinder?

• The gas cools down and contracts

• The gas remains at constant temperature

• The gas expands and pushes the piston

• The gas turns into a liquid

What is the formula for calculating the pressure exerted by a gas in a piston?

• P = F + A

• P = F / A

• P = A / F

• P = F * A

What does Δh represent in the context of the expansion of a gas in a cylinder?

• Change in heat

• Change in pressure

• Change in volume

• Change in height of the piston

How is the work done by the piston calculated?

• Work = P × V

• Work = F × A

• Work = P × A × Δh

• Work = ΔV × A

What does ΔV represent in the formula ΔV = A × Δh?

• Change in pressure

• Change in force

• Change in volume

• Change in area

What happens to the variable w during the compression of a gas?

• w becomes a negative quantity

• w remains unchanged

• w becomes a positive quantity

• w becomes zero

What is the equivalent of 1 standard atmosphere in millimeters of mercury (mm Hg)?

• 760 mm Hg

• 500 mm Hg

• 1013 mm Hg

• 850 mm Hg

During the compression of a gas, what is the nature of ΔV?

• ΔV is a positive quantity

• ΔV is zero

• ΔV is a negative quantity

• ΔV increases

What letter is used to express enthalpy in chemistry?

• G

• E

• H

• P