Thermochemistry 2

The study of the heat flow that accompanies a chemical reaction.

• Intermolecular Forces

• Solutions

• Chemical Kinetics

• Thermochemistry

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Energy flows from a hotter object to a cooler one until thermal equilibrium is achieved between the objects.

• True

• False

Tags

NGSS.HS-PS3-4

A chemical process that absorbs heat is

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A chemical process that releases heat is

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

The first law of thermodynamics states that the net change in the energy of a system is equal to the heat and work applied to or by the system.

• True

• False

Tags

NGSS.HS-PS3-1

What is exchanged between the system and its surroundings?

• Water

• Calorie

• Heat

• All of the above

Tags

NGSS.HS-PS3-4

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

• Entropy

• Enthalpy

• Thermochemistry

• Chemical Kinetics

The standard enthalpy of a reaction can be calculated as the difference between the sum of the standard molar enthalpies of formation of the products and the reactants.

• True

• False

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

The standard enthalpy can also be obtained from the different thermochemical equations that define the overall reaction by applying Hess's law.

• True

• False

Which statement does not represent a thermos?

• a vacuum flask consisting of two containers.

• The space between the containers is partially vacuumed and sealed.

• an application of the first law of thermodynamics, removing the air in this space isolates the inner flask and minimizes its contact with the surroundings.

• heat flow is reduced and the temperature of the liquid in the inner container is for a short period of time.

• Also known as the Dewar flask invented by James Dewar in 1892.

Tags

NGSS.HS-PS3-4