Mixtures are 'separated through
._changes.
compound
physical
mixtures

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled