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I learned that in 1930s we used less energy then we do now. The average home in the 30s used 2 pounds of carbon dioxide,the average home now uses 92 pounds of cd. Each gallon of gas a car uses 172 pounds of cd in 2010,in 30s each gallon of gas the cars used 20 pounds of cd. In the 30s trees absorbed one ton over there lifetime it's the same for 2010. Insulation is used 2 conserve energy inside structures by reducing tempature changes. I learned that how you be safe with electricity, you can do many things wrong, like you can place a object on top of a electrical cord, cause doing that you can damage the cords.also I learned that if u dangle something over a lamp u can cause a fire,and dont pull things by a power cord, just dangerous.
Article posted April 12, 2012 at 09:34 AM •
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Acidic and basic are two extremes thatdescribe chemicals, just like hot and cold are two extremes that describe temperature. Mixing acids and bases can cancel out their extreme effects; much like mixing hot and cold water can even out the water temperature. A substance that is neither acidic nor basic is neutral.
The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Each whole pH value below 7 is ten times more acidic than the next higher value. For example, a pH of 4 is ten times more acidic than a pH of 5 and 100 times (10 times 10) more acidic than a pH of 6. The same holds true for pH values above 7, each of which is ten times more alkaline—another way to say basic—than the next lower whole value. For example, a pH of 10 is ten times more alkaline than a pH of 9.