Wednesday, April 30, 2014

What will we talk about in science today? Carbon, macronutrients, and carbohydrates

The next section of General Science is about macronutrients, starting with carbohydrates.  However, I would like to back up a little bit, and talk about carbon.  Look at the double-spread page "The chemistry of carbon" in DK Chemistry.  Think about carbon paper, eggshells, diamonds, and chalk. (Do you remember learning about coal last year? Updated link)  Where does the name "carbohydrate" come from?

Now turn the page and look at "The chemistry of life" in the same book.  See the diagram/photograph of the carbon cycle?  What is metabolism?

Now let's read from General Science, starting on page 304, and discussing the different forms of carbohydrates (studying the diagrams there).  Work out the names for the simple and complex carbohydrates.

So where do we get carbohydrates?

Sugar - fruit, fruit juice, table sugar, honey, soft drinks, and other sweets
Starch - bread, cereal, potatoes, pasta, rice, and legumes (dried peas and beans)
Fiber - bran, whole-grain foods, raw vegetables and fruit (especially the seeds and skins), legumes, nuts, seeds and popcorn
(This list and other ideas taken from a lesson plan at Utah Education Network.)
Make a list of your ten favourite "carbohydrate" foods.  Mark down which ones are simple and which ones are complex.  (Use the chart provided.)  Does it matter to us if we eat more simple or more complex carbohydrates?  Why?  Here's one answer.
Cartoon found here.

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