What is the formula of compound formed from a calcium ion and As? Express your answer as a chemical formula

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

How do you convert 4 mmol of bromobenzene to ml?