When creating a graph, why is an appropriate title for a graph important?

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

How are isotopes of the same chemical element alike? how are they different?

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.