El elemento químico ¿qué lo define como tal?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

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.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these