Time (s) 1 What is the melting point in °C for naphthalene? 2 Explain how you know this from the graph. 3 Use the Kinetic Molecular Theory to explain why the graph is 'flat' from time 4 - 11 s. Consider the following substances: Na, CO₂, CaBr2, NH3, Ni Which of these substances: 11.4.1 is a (are) covalent molecule(s)?​