What amount of heat will change 30 g of ice at -40°C to liquid water at 70°C?
A. 21.1 kJ
B. 8.7 kJ
C.2.5 kJ
D. 12.4 kJ

Bis the

The answer is accuracy

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.   

Theyre semiconductors.