1. Which phase changes need energy to occur? 2. Which phase changes lose energy as they occur?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro