Thermodynamics

Thermochemistry is the study of the heat evolved or absorbed in chemical reactions.

• It is the study of energy changes that occur during chemical rxns and changes in state

• It is the study of the motion of objects.

• It is the study of energy conversion in ecosystems.

• It is the study of physical properties of materials without heat considerations.

Tags

NGSS.HS-PS3-4

NGSS.HS-PS1-4

NGSS.HS-PS1-5

What is the difference between heat and temperature? State the difference concisely.

• Heat is energy transfer due to a temperature difference, while temperature is the measure of the average kinetic energy of particles.

• Heat and temperature are the same.

• Temperature is energy transfer and heat measures particle movement.

• Heat measures particle movement and temperature transfers energy.

Tags

NGSS.HS-PS3-2

In what direction does heat always transfer?

• From a higher temperature to a lower temperature

• From a lower temperature to a higher temperature

• From a hot region to an equally hot region

• It transfers in both directions equally

Tags

NGSS.HS-PS3-4

What is thermal equilibrium?

• Heat flows until the temperature is the same.

• Objects exchange heat until one becomes hotter.

• Heat flows continuously between objects at different temperatures.

• Thermal equilibrium occurs only in isolated systems.

Tags

NGSS.HS-PS3-4

What is the heat required to raise the temperature of water 1°C?

• 1 calorie

• 1 Joule

• 1 BTU

• 4.184 Joules

Tags

NGSS.HS-PS3-4

Units of Heat (q): The joule (J): _______

• The SI unit of energy

• The SI unit of power

• The SI unit of force

• The SI unit of temperature

Tags

NGSS.HS-PS3-4

What would likely happen if you were to touch the flask in which an exothermic reaction was occurring?

• The flask would feel cooler

• The flask would feel warmer

• The flask would feel the same before and after a reaction

• None of the above

Tags

NGSS.HS-PS1-4

What is true of this reaction?

• Equal amounts of energy were released and absorbed
• The reaction released more energy than it absorbed
• The reaction absorbed more energy than it released

Tags

NGSS.HS-PS1-4

Heat capacity is

• the amount of heat energy required to raise the temperature of a substance by one unit.

• It is the energy released during a reaction.

• It is the total energy content of the substance.

• It is the rate at which heat is transferred.

Specific heat is the amount of heat per unit mass required to raise the temperature of a substance by 1 degree Celsius.

• The amount of heat per unit mass required to raise the temperature of a substance by 1 degree Celsius.

• The energy stored in a substance at a given temperature.

• The rate at which a substance conducts heat.

• The total heat energy contained in a substance.