Calcule el valor de pH para cada una de las siguientes soluciones a 25ºC e indique el carácter de la solución (acida, básica o neutra). a) Una solución en que [H+] = 1.0x10-9 M
b) Una solución en que [H+] = 1.0x10-6 M
c) Una solución en que [H+] = 1.0x10-8 M

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.