Mgso4equilibrate the hydrolysis reaction

Which substances have the lowest melting points: ionic covalent, or metallic

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.