List three common counting units and their values.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.