BendoMexo

Question 1

How do we know if the reaction is exothermic

Answer 1

• If the energy released when forming bonds is greater than the energy needed to break bonds
• it is Exo

Question 2

How do we know if the reaction is endothermic

Answer 2

• If the energy released when forming bonds is less then the energy needed to break bonds
• the reaction is Endo

Question 3

Moles equation

Answer 3

Mass = mr x moles

Question 4

What are the steps in reacting mass calculations

Answer 4

• Write equation and work out Mr
• use the Mr to work out the moles of a substance
• use a ratio to compare with other element, work out it’s moles
• use the worked out moles to find the mass