A 25.00 mL sample of a hydrochloric acid solution of unknown concentration was titrated with 0.09899 M NaOH solution. Calculate the concentration of the acid if the initial burette reading is 2.14 mL and the burette reading when the endpoint was observed was 21.62 mL

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

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

What happens when an atom of sulfur combines with two atoms of chlorine to produce sci2? a. each chlorine atom shares a pair of electrons with the sulfur atom. b. an electron is transferred from each chlorine atom to the sulfur atom. c. an electron is transferred from the sulfur atom to each chlorine atom. d. each chlorine atom shares all its valence electrons with the sulfur atom.