6: Thermochemistry

Temperature changes in a system indicate a change in ________ .

Tags

NGSS.HS-PS3-4

_________ is the system and surroundings together.

______ energy : refers to the position/orientation of molecules and its bonds.

______ energy : refers to the speed of molecules based on temperature.

Tags

NGSS.HS-PS3-2

_____ is the amount of thermal energy transferred from something that is hotter to something that is colder. Units include _ or __.

Answer explanation

Heat is the amount of thermal energy transferred from something that is hotter to something that is colder. Units include J or kJ.

Tags

NGSS.HS-PS3-4

Exothermic is the process when heat travels from ________ to ________. This typically has a ______ enthalpy.

Tags

NGSS.HS-PS3-4

Endothermic is the process when heat travels from ________ to ________. This typically has a ______ enthalpy.

Tags

NGSS.HS-PS3-4

______ is the energy needed to move something against a force.

System pushing on surroundings is _______ work. Examples include gas expanding in a piston.

Surroundings pushing on system is _______ work. Examples include gas compressing into a piston.

The two symbols for heat change are __ and _ .

Thermochemistry of Solutions:

3 Steps of solution forming.

1. 1. The solvent must ______ by overcoming its ___________ forces. This is an ________ process.

2. 2. The solute must _____ by overcoming its ________ forces. This is an ________ process.

3. 3. The solute and solvent _______ which is an _______ process.

Answer explanation

Thermochemistry of Solutions:

3 Steps of solution forming.

1. 1. The solvent must expand by overcoming its intermolecular forces. This is an endothermic process.
   

2. 2. The solute must expand by overcoming its intermolecular forces. This is an endothermic process.
   

3. 3. The solute and solvent recombine which is an exothermic process.