Which statements correctly describe covalent bonding? Select all the correct answers. Atoms share a pair of valence electrons. Atoms are held together by their opposite charges. Distinct groups of atoms called molecules are formed. Metal atoms bond with other metal atoms.

What type of reaction fuels the processes seen here?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility