Physical properties are : a. those properties which can be observed without changing the identity of the substance. b. those properties which include combustibilty, flammability, and reactivity. c. those properties which require a chemical reaction to be observed. d. all of these

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number

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.