Which list of elements contains only metals?
a. carbon, iodine, tin
b. tin, copper, carbon
c. cesium, iron, copper
d. iodine, carbon, argon

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Air can be considered a mixture. which statement does not explain why?

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?