Today we will investigate the reducing power of orange.
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This is a neat logic trick which allows you to flip over a stack of cards numbered 1-10. When you flip the back upright, they are in numerical order. There is a special way to make it work, so pay close attention to the video. I’ll show you exactly how it works.
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Calcium is an element that is softer than aluminum but harder than sodium, and it’s less chemically reactive than alkaline metals. Have you ever looked inside of a water pipe? The hard, white crust you see is probably calcium or magnesium deposits (especially if you have “hard” water). When calcium comes in contact with air, it forms an oxide coating which protects it from further corrosion.
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Tannins are everywhere in nature: in wood, bark, leaves, and fruit of plants like walnut, cranberry, cacao, grapes, and oak trees. Tannins are how plants make themselves unappetizing to animals, so they won’t eat the fruit before it’s ripe. Have you ever eaten an unripe pear or plum? That’s the tannin you’re tasting! People have used tannins to “tan” animal hides to make leather. People like tannins in their food, because it can be managed to make the food taste really good, like in chocolate, tea, coffee, and wine.
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We’re going to look at the properties of sugar. We’re going to combine sugar in different solutions to explore the interesting properties it has, including how even though sugar is sweet, something like apple juice, which has a lot of sugar in it, is actually acidic! It’s important that you DO NOT EAT ANYTHING in this lab. This is a CHEMISTRY LAB.
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