Because if all the trees and grasslands are to disappear and turn into deserts then there would be no oxygen for us
Answer:
copper has 2+ ions in a sample of copper
The concentration is 5 g/L.
Concentration = mass/volume = 10 g/2 L = 5 g/L
For changing potential energy; When you drop a book, gravitational potential energy is transformed into kinetic energy. Your car transforms the chemical potential energy stored in gasoline into the kinetic energy of the car's motion.
For Kinetic Energy; kinetic energy can be converted into electrical energy by a generator or into thermal energy by the brakes on a car.
The answer to problem is [He] 2s1. Hope it helps