Which of the following statements best describes the composition of rocks?

a. rocks always consist of a single type of mineral.
b. rocks can only be made up of a combination of three types of mineral.
c. rocks are made up of one or more types of mineral.
d. rocks are made up of at least three different types of mineral.

How many neutrons does a atom of cobalt have?

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

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.