Timed
harry has a sample of an unknown material. the sample has a mass of 81 grams and a volume of 0.9 cubic centimeters. what is the density of the sample in grams per cubic centimeter?
plz !

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

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.