He carbon-14 isotope is important because it allows scientists to determine the of an organic sample. a) age b) density c) evolution d) mass

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

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?

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