If 20.0 mL of acetone (C3H6O) is diluted with distilled water to a total solution volume of 200.0 mL, what is the percent by volume of the acetone in the solution?

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

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

What is a number added in front of a formula in order to balance the equation