ASAP. What process describes the tendency of atoms in matter to spread further apart when it is heated? A. thermal contraction

B. thermal conduction

C. thermal radiation

D. thermal expansion

Which of the following statements is true about planck’s law

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

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 ?