Answer ASAP
30 points!!
Why do elements and compounds qualify as pure substances?

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

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?