Gases have maximum density and rigidity true or false​

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Why is carbon ideal for making different compounds?

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.