Differentiating Endothermic and Exothermic Processes

What is referred to as the 'system' in the context of an ice cube melting on a hot day?

• The air

• The ice cube

• The Sun

• The street

Tags

NGSS.MS-PS1-4

In a chemical reaction, what does a negative Delta H indicate?

• Energy is absorbed by the system

• Energy is released into the surroundings

• The reaction is endothermic

• The reaction is at equilibrium

Tags

NGSS.HS-PS1-4

Which of the following is an example of an endothermic process?

• Freezing

• Condensation

• Melting

• Deposition

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What must happen to reactants in an endothermic process to go from low potential energy to high potential energy?

• They must remain at the same energy level

• They must convert to a solid state

• They must release thermal energy

• They must absorb thermal energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is a characteristic of exothermic processes?

• They absorb thermal energy

• They require a heat source

• They release thermal energy

• They feel cool

Tags

NGSS.MS-PS1-4

What is the Delta H value for the reaction in hand warmers?

• -1644 kJ

• 1644 kJ

• -483.6 kJ

• 483.6 kJ

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which process is exothermic?

• Melting

• Sublimation

• Condensation

• Evaporation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to water vapor molecules during condensation?

• They turn into ice

• They remain at the same energy level

• They release energy and slow down

• They absorb energy and speed up

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following processes is endothermic?

• Freezing

• Deposition

• Sublimation

• Condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to water molecules as they are heated from ice to gas?

• They release thermal energy

• They turn into a solid

• They remain at the same energy level

• They absorb thermal energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4