1. A 25 kg ball has a kinetic energy of 225 J. What is the speed of the ball? What kind of question is this? Energy 3 m/s 2. How many molecules of water are there in 100 mL of water? (The density of water = 1.000 g/ml.) What kind of question is this? Stoichiometry 3.34 x 1024 molecules 3. Given that the atomic mass of carbon is given as 12.0107 g/mol, what are the approximate relative abundances of the two isotopes 12C and 13C? What kind of question is this? Isotopes 98.93% 12C, 1.07% 13C 4. In the electrolysis of 2H2O 2H2 + O2, how many atom of O in O2 are made from 4 g of H2O? What kind of question is this? Stoichiometry 1.34 x 1023 molecules 5. What are the most likely ionic forms of (a) sodium and (b) calcium? What kind of question is this? Periodic trends (a) Na+; (b) Ca2+ 6. What is the product of a reaction between metallic lithium and oxygen, O2? What kind of question is this? Oxidation numbers Li2O 7. Name the following species: (a) Cl-, (b) NO3-, (c) C3H8. What