Chemical Reactions

Question 1

What is an Exothermic reaction?

What is an Endothermic reaction?

Answer 1

An Exothermic reaction is when heat energy is released to the surroundings. (Gets HOT)

An Endothermic reaction is when heat is absorbed from the surroundings (Gets COLD)

Exo = Exit = Heat Exit

Question 2

What are two examples of reactions which give out energy?

Answer 2

Combustion and respiration are reactions which give out energy

Question 3

What is ∆H? (Delta H, something to do with energy)

Answer 3

∆H (Delta H) is the Energy Change involved in a reaction

∆H = energy of products - reactants

Question 4

What is the equation used to calculate ∆H (Delta H, Energy Change)

Answer 4

The equation used to calculate ∆H is:

∆H = energy of products - reactants

Question 5

What is ∆H for endothermic reactions?
and
What is ∆H for Exothermic reactions?

Answer 5

For Endothermic reactions ∆H is positive (The reaction gets cold but it takes in heat)

For Exothermic Reactions ∆H is negative (The reaction gets warm but it gives out heat)