What causes a substance to change states of matter?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

List and describe the neurological effects of the vocs and other air pollutants,as described by dr.theo colborn

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating