Which term describes a pure substance that is made up of only one type of atom?

1)matter
2)rock
3)compound
4)element

Find the mass in grams of 1.37x1020 particles of h3po4

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.

What two categories of toxins were present in the air at dish, texas as a result of the gas pipelines that pass through the area