Chemical Impact Yes, this man’s skin is BLUE. His skin became blue as a result of his exposure to a chemical. This man INGESTED a silver nitrate solution, which caused discoloration of the skin.
Chemicals • A chemical is any substance that has a DEFINED MOLECULAR COMPOSITION. H2O, C6H12O6, NaCl, HCl, NaOH. (water, glucose, sodium chloride, hydrochloric acid, sodium hydroxide) • There are naturally occurring and SYNTHETIC chemicals on earth. • Natural means found in nature. • Synthetic means man-made (the chemical was produced in a laboratory).
Natural vs. Synthetic • Sucrose & glucose are naturally occurring sugars, while ASPARTAME (sweet-n-low) is a synthetic sugar substitute. • Clorox, plastics, and chemotherapy drugs are other examples of SYNTHETIC drugs. • Can you name some naturally occurring chemicals?
Risk-benefit Analysis • Take 1 minute as list all of the good and bad things that could result from taking chemotherapy for cancer.
Risk-benefit Analysis • Cancer is a serious, sometimes fatal disease. Chemotherapy is one drug that may cure the person of the disease. The negative side-effects are the risks the person takes when using the chemical. • Before a chemical is used, one must determine if the benefits of the chemical out-weigh the risks.
Risk-benefit Analysis • What do you know about ASBESTOS? • What were the benefits of ASBESTOS? • What are the risks of ASBESTOS? • Asbestos is no longer used for electrical and building insulation because of its negative effects on human health. IT CAN CAUSE MESOTHELIOMA (a type of lung cancer). (potential EOG question…)
Risk-benefit Analysis • Choose one of the following chemicals, take 3 minutes with your partner, and determine if the chemical should be used by using the risk-benefit analysis. • Nicotine • Caffeine • chlorofluorocarbons (CFC’s) • Ethanol (drinking alcohol)
Does the DOSE matter? The dose simply tells you how much to take. It is important to follow directions EXACTLY as they appear. How would the dose for an adult differ from the dose of a child? Why?