Chemical reactions 2ESO

Watch these videos and answer the questions 

Video 1

• What is a chemical proccess
• What examples of chemical reactions do they give us?
• What type of properties change during a chemical reaction. Give examples of each type
• Explain, using the film's words, what a chemical equation stands for

Video 2:

Watch and apply to balance these equations:

• N2 + O2 -> N2O5
• CH4 + O2 -> CO2 + H2O
• Li + O2 -> Li2O