What have chemists done to people conserve energy?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.