Achemical change occurs when a. dissolved minerals freeze to form a crystal. b. ethanol is purified through distillation. c. salt deposits form from evaporated sea water. d. a leaf changes color from green to red.

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.