Why are some elements no longer found on earth

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?

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.

Which of the following describes qualitative data? a) recording the temperature of a solid as it is warmed. b) noting the color of a solution as it is heated. c) measuring the volume of an object by water displacement. d) taking the mass of an object using a balance.