Provide examples to support the claim that processes involving breaking and making of several covalent bonds are sometimes not reversible.

1) Numerical Values a. Exact numbers: has no uncertainty; countable; human defined conversion i. 84 students ii. 1 foot=12 inches b. Inexact numbers: estimations; has uncertainty; measured numbers i. 6.25 in last digit is uncertain 2) Accuracy vs. Precision a. Accuracy: how close a measurement is to the actual (true) answer i. Almost never perfect ii. Too much human error b. Precision: reproducibility of a measurement i. Can you do it again 3) Rounding a. Drop last digit if: i. >5: round up (10.2610.3) ii. <5: round down (10.2410.2) iii. =5: middle of scale (10.2510.2) 1. Always round to even numb