HELPPLS

Which one of the following processes is endothermic? A)boiling a liquid B)freezing a liquid C)Condensation of gas into liquid D)Condensation of gas into solid

A 21.5 g sample of nickel was treated with excess silver nitrate solution to produce silver metal and nickel(II) nitrate. The reaction was stopped before all the nickel reacted, and 36.5 g of solid metal (nickel and silver) is present. Calculate the mass...

How does the field of science gain knowledge and understanding?(1 point) by making value judgments through deductive reasoning through the testing of hypotheses by using the latest technologies ( it would be better if you could give me all answers to the...