## Calculating Quantities for Stoichiometric Chemical Reactions

[caption id="attachment_17791" align="alignright" width="380"] Image CCA-SA3.0 Unported by Lord Mountbatten[/caption] Exam time approaches and you realize your teacher is likely to write down some equations and expect you to fill in the blanks. So you would like to consider a few problems ahead of time to prepare you in advance. We will demonstrate two. The second problem is just a bit tricky. See if you can anticipate what gives! Problem 1: We will first consider the reaction of sodium hydroxide (NaOH) plus hydrochloric acid (HCl) to yield sodium chloride (NaCl) plus water (H₂O). NaOH + HCl → NaCl + H₂O Only one molecule of each reactant is needed to produce one molecule of each product. 1 NaOH + 1 HCl → 1 NaCl + 1 H₂O The atomic weights for…

## Differences between Warts and Moles, Boils, Corns, Bunions

[caption id="attachment_28016" align="alignright" width="480"] Common moles. -National Cancer Institute[/caption]Do you have warts and moles? Or perhaps you have other unpleasant distinguishing marks on your skin such as boils, corns, or bunions? Beauty may be in the eye of the beholder. Yet, sometimes, instead, it is in the eye of the possessor. We may be surprised by the sudden appearance of a growth on our head, our hand, or our foot. More commonly, especially during adolescence, we experience pimples or blackheads. However, more permanent growths can include warts and moles, boils, corns, and bunions. What are these? How do they differ? Warts and Moles Warts are growths produced in the outer layers of the skin, frequently on the hands and fingers, by the human papillomavirus, or HPV. They may generally be…