chemistry. what is chemistry? what does it have to do with me?
Post on 29-Dec-2015
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Chemical Use
Phosphoric acid Fertilizer; rustproof metals; gas additive
Dicalcium phosphate Glass additive; plastics stabilizer
Magnesium hydroxide Antacid; fuel oil additive; laxative
Sodium ascorbate Preservative
Ferric orthophosphate Fertilizer; feed additive
Biotin Part of B vitamin complex
Niacinamide Medicine
Copper gluconate Breath freshener
Zinc oxide Floor tiles; photographic chemicals; diaper rash
Thiamin mononitrate Vitamin enhancer
Pyridoxine hydrochloride Dietary supplement
Calcium pantothenate Animal feeds; medicine
Folic acid Used to treat anemia
Acetate Lacquer; magnetic tape; photographic film
What Does It Have To Do With Me?“What does chemistry have to do with me?” said Mr. Averageman, as he looked at a page printed with ink made by a chemical process, and tied his shoes, made of leather tanned by a chemical process. He glanced through a pane of glass, made by a chemical process, and saw a bakers wagon full of bread leavened by a chemical process, and a draper’s wagon delivering a parcel of silk, dyed by a chemical process.He put on a hat, shaped by a chemical process, and stepped out on the asphalt pavement, compounded by a chemical process, bought a daily paper with a penny refined by a chemical process.“No,” he added, “of course not, chemistry has nothing to do with me.”
Herbert Newton Casson1869-1964
[Merrill Chemistry 1995
Has inertia refers to
• the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force inertia
Has energy which means
• The ability to do work– In science we say that work is done on
an object when you transfer energy to that object.
What did you notice about…
• Their hands?
• Which was more difficult to catch?
• Which required greater effort to stop ?
• Remember that inertia is the resistance to a change in motion.
Many different types of energy
• Chemical• Nuclear• Radiant– Heat– Light– Electrical
• Mechanical– Kinetic– Potential
“Matter and energy are two sides of the same physical entity.” Alber Einstein
• E = mc2
– E = Energy–m = Mass– c = speed of light• 3 x 108m/s
Law of Conservation of Mass and Energy
• matter and energy are interchangeable
• the total amount of matter and energy in the universe is constant
Because of this, chemical rxn…
• are always accompanied by changes in energy (E)– E given off - exothermic– E used – endothermic
• Cannot gain or lose –mass of reactants = mass of products
THE CHEMICAL INDUSTRY• makes up about 10% of the gross
national product.– The amt. of goods and services sold by the
US in a year• employs more than 1,000,000 people• one of few US industries with a positive
trade balance – exports more than it imports
• Chem. EXPORTS exceed IMPORTS by more than 17 BILLION dollars per year
THE CHEMICAL INDUSTRY• intermediate - material [not a raw
material] that is used to make final products. – Flour - bread, rolls, crackers – thread / fabric - clothes, upholstery – sheet metal - duct work, office furniture.
• Economists can use the quantity of sulfuric acid to determine the quality of living in a country. [the greater the sulfuric acid exports the higher the quality of living for the average citizen.]
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