Calculate the hydrogen ion concentrations in soulutions having the following PH values: a) 4.

*plz I need the answer asap*​

What must be in balance for temperatures to remain constant?

What is the most common reason for matter changing its state?

Which would freeze at a higher temperature: the great salt lake or lake tahoe? a. lake tahoe would freeze at a higher temperature. b. the great salt lake would freeze at a higher temperature. c. both lakes would freeze at the same temperature.