a burning candle of 1.5 cm height is give at a distance of 4 cm for a convex lens of focal length 2 cm complete the ray diagram

Do polar molecules have ionic bonds?

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!