Apiece of copper is 2x2x4 cm and has a mass of 142, what is the density of copper

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

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

Why do lunar and solar eclipse not happen every month