Endothermic and Exothermic Reactions MCQ

What is enthalpy?

Enthalpy (H) is the sum of all potential and kinetic energies in a system

What is the change in enthalpy determined by?

the system

What is change in enthalpy independent from

Change in enthalpy is independent of the environment

In an endothermic reaction, is 0 less than or greater than △H?

△H > 0

In an exothermic reaction, is 0 less than or greater than △H?

△H < 0

Does heat enter an endothermic system or leaves it?

enters into system from the environment (endo means in)

Does heat enter an exothermic system or leaves it?

leaves out of system into the environment (exo means out)

What goes in the x axis of an enthalpy diagram?

the reaction progress (normally seconds)

What goes in the y axis of an enthalpy diagram?

potential energy (normally kJ)

Freezing and condensing is an example of what reaction?

exothermic

Do exothermic reactions feel hot or cold?

hot

Environment gains or loses energy in an exothermic reaction?

gains

Melting and boiling is an example of which reaction?

endothermic

Do endothermic reactions feel hot or cold?

cold

Environment gains or loses energy in an endothermic reaction?

loses