When you use a chemical cold pack, you squeeze the room temperature contents together until the mixture becomes very cold. A friend comments that chemical reaction must be “giving off coldness”, so that your hands are "freezing cold". Comment on the validity of this statement given your understanding of thermodynamics.

Which of the following is not a true statement about dwarf planets? a the kuiper belt contains comets, asteroids, and dwarf planets. b ceres is a dwarf planet located in the kuiper belt. c the largest known dwarf planet in the solar system is named eris.

Draw metallic bonding if two copper

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!