What new characteristic did John Dalton add to the model of the atom? A) An atom is a round, solid mass B) An atom has a massive, positive center C) An atom is made up of smaller particles D) An atom can join with other kinds of atoms

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

What can be found in the ionosphere

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume