What would you observe in the reaction of calcium with nitric acid​

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.

How many moles are in 43.9 l of oxygen

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 .