Which definition best describes global warming? -a long-term change in the Earth's climate -a long-term increase in the Earth's average temperature
-a long-term change in the climate of a region
-a city KD solar heat that is radiated out into space​

Ethene molecular fórmula= c2h4molecular weight = 29.046g/molhope it : )

Zinc contains about 30 protons 

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.