A divalent metal ion dissolved in dilute hydrochloric acid forms a precipitate when H2S is bubbled through the solution. Which ion is it? (A) Ca2+ (B) Mn2+ (C) Zn2+ (D) Cd2+

What type of electromagnetic radiation has a shorter wavelength than blue light

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Awoman's basketball has a circumference between 28.5 and 29.0 inches and a maximum weight of 20 ounces (two significant figures). what are these specifications in units of centimeters and grams?