Which of the following is an indication of a chemical reaction A. Freezing B. Melting C. Release of heat D. All of the above

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Is the vertical component of velocity ever zero?

Elements in group viiia (also known as group 18, or the noble gases) have similar properties because they all have a. the same number of electron shells b. full octets c. the same number of valence electrons d. the same number of electrons needed to fill their octet