Which of these is an example of a physical change? 1.a banana ripening in air 2.hydrogen burning in the air 3.zinc reacting with an acid 4.liquid water turning into vapor

Alright my friend so let's put it this way A banana ripening is still a chemical change so we can throw that one out if hydrogen is burning it'll be a chemical zinc is reacting with an acid therefore making it a chemical so the best option will be that liquid water turning into vapor would be a physical change so 4. is your answer

Answer:

a. energy is absorbed in the reaction.

explanation:

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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