Reaction Energy

An energy profile for a reversible chemical reaction is shown. According to this profile, the activation energy of the reverse reaction is equal to

• D

• C - B

• A - B

• C- D

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which letter shows the enthalpy of the reaction?

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What does 'W' represent in the energy profile diagram shown?

• Kinetic Energy

• Reactants Energy of Formation

• Products Energy of Formation

• Activation Energy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What does 'Q' represent in the energy profile shown here?

• Potential Energy

• Reaction Progression (time)

• Reactants Energy of Formation

• Activation Energy

Tags

NGSS.HS-PS1-4

Energy needed to break chemical bonds in the reactants to start a reaction

• Thermal energy

• Potential energy

• Kinetic energy

• Activation energy

Why is so much energy required and released in a nuclear reaction?

• Nuclear reactions require no energy input and release energy through chemical bonds.

• A large amount of energy is required to overcome nuclear forces, and energy is released due to mass conversion during nuclear reactions.

• Energy is only released when atoms are split into smaller atoms without any mass loss.

• Energy is needed to cool down the reaction and prevent overheating during the process.

Tags

NGSS.HS-PS1-8

In an endothermic reaction the system is releasing energy.

• True

• The system absorbs energy.

• Endothermic reactions are exothermic.

• False

Tags

NGSS.HS-PS1-4

A reaction that needs energy (heat) added to it and makes the area around it seem colder

• Endothermic reaction

• Exothermic reaction

• Catalytic reaction

• Spontaneous reaction

Tags

NGSS.HS-PS1-4

A reaction that produces (gives off) heat and makes the area around it feel warmer

• Exothermic reaction

• Combustion reaction

• Catalytic reaction

• Endothermic reaction

In an endothermic reaction, heat is ...

• released

• neutral

• decomposed

• absorbed

Tags

NGSS.HS-PS1-4