During a very cold winter, the temperature may remain below freezing for extended periods. However, fallen snow can still disappear, even though it cannot melt. This is possible because a solid can vaporize directly, without passing through the liquid state. Is this process (sublimation) a physical or a chemical change?

Friday January 8, 2016 Important Information: Pset #1 due Monday @ 2:30pm Lecture 3: Rate Laws Continued Clicker Question #1 You suspect that the reaction 2NO → 4NO + O is first order with respect toO]. How 2 5 2 2 2 5 should you plot [N2 5versus time (t) to confirm your suspicion a.) [NO] vs. t 2 5 b.) [2 5vs. 1/t c.) ln[NO] vs t 2 5 d.) ln[2 5vs. 1/t e.) 1/[NO] vs. t 2 5 solution for a first order reaction, the equation2 5= kt + ln2 50 This equation is in the form y = mx + b (the equation of a line), so in order to see if this reaction follows the trend, you would plot y (ln[2 5 vs. x (time). Radioactive Decay