• What is a mixture?
• What is an element?
• What is a compound?
• What is a fixed composition of mass?
• What are the differences between compounds and mixtures? (5 criteria)
• What are the common cations, their formulas and their valencies? (16 cations)
• What are the common anions, their formulas and their valencies? (16 anions)
• How are chemical formulas of ionic compounds written?
• What are the 3 types of molecules?
• What are ionic equations?
• How are ionic equations written?