5. The pH of a solution is 4. Which of the following is correct?
(A) The solution is basic with an [OH-] of 1 x 10-4
(B) The solution is acidic with a pH of 10
(C) The solution is acidic with a pOH of 10
(D) The solution is basic with a pOH of 4

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)