Which statement is true of phenolphthalien? a. it can be used in combustion reactions. b. it is colorless in the presence of an acid and pink in the presence of a base. c. it gives you the exact ph of a solution. d. it is colorless in the presence of a base and pink in the presence of an acid. e. it is called a decomposition indicator.

The answer is a) carbon-12

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy