If a substance has a hydroxide ion (OH-) concentration of 1.8 x10 -10, what is its pH? Please Hurry !

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments

Rays from the sun are not considered matter true or false

The molar mass of iron(fe) is 55.8 g/mol. what is the mass in grams of 2.25 moles of iron?