Professor baker wants to mix a solution containing 15% acid with one containing 20% acid to obtain a 25-ounce solution containing 16% acid. how many ounces of the 15% solution should the professor use?

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

In which situation can a mixture always be called a solution