Ahad, 27 Oktober 2013

Amali Sains: Apungan Tin Minuman Bikarbonat


Mengapakah tin “regular coke” tenggelam manakala tin “diet coke” terapung?



Place both cans in the water. The Coke will sink; the Diet Coke will float. Ask students to hypothesize about why this is so. (Caption: The difference between the two densities is real, but subtle. Make sure to do this in a large volume container (1000-2000 ml) in order to make the difference as obvious as possible.  The density if Coke is slightly above 1.0 g/ ml and the density of Diet Coke is just about 1.0 g/ ml. The density of water (at room temp) is 1.0 g/ml. We assume the aluminum cans are identical in density.) - See more at: http://www.arborsci.com/cool/exploring-matter-chemistry-demonstrations#sthash.xt1KaJR7.dpuf

The density if Coke is slightly above 1.0 g/ ml and the density of Diet Coke is just about 1.0 g/ ml. The density of water (at room temp) is 1.0 g/ml. We assume the aluminum cans are identical in density.)Place both cans in the water. The Coke will sink; the Diet Coke will float. 

The difference between the two densities is real, but subtle. Make sure to do this in a large volume container (1000-2000 ml) in order to make the difference as obvious as possible. 
Place both cans in the water. The Coke will sink; the Diet Coke will float. Ask students to hypothesize about why this is so. (Caption: The difference between the two densities is real, but subtle. Make sure to do this in a large volume container (1000-2000 ml) in order to make the difference as obvious as possible.  The density if Coke is slightly above 1.0 g/ ml and the density of Diet Coke is just about 1.0 g/ ml. The density of water (at room temp) is 1.0 g/ml. We assume the aluminum cans are identical in density.) - See more at: http://www.arborsci.com/cool/exploring-matter-chemistry-demonstrations#sthash.xt1KaJR7.dpuf
Place both cans in the water. The Coke will sink; the Diet Coke will float. Ask students to hypothesize about why this is so. (Caption: The difference between the two densities is real, but subtle. Make sure to do this in a large volume container (1000-2000 ml) in order to make the difference as obvious as possible.  The density if Coke is slightly above 1.0 g/ ml and the density of Diet Coke is just about 1.0 g/ ml. The density of water (at room temp) is 1.0 g/ml. We assume the aluminum cans are identical in density.) - See more at: http://www.arborsci.com/cool/exploring-matter-chemistry-demonstrations#sthash.xt1KaJR7.dpuf


The students will probably guess that the only real difference between these sodas is the sugar content. Coke contains approximately 39 grams of sugars (high fructose corn syrup and/or sucrose, which is regular old sugar) . Diet Coke contains Nutrasweet (aspartame) and since Nutrasweet is SO much sweeter than sugar, only about 100 milligrams per can are required to get it to match Coke’s level of sweetness. That’s a pretty big difference and the reason for the difference in densities of the two sodas

If you want to make it more interesting, try the new low-carb Coke, C2, and see where its density falls with respect to the other two. It contains a combination of artificial sweeteners (aspartame, acesulfame potassium, and sucralose, which is Splenda) in addition to high fructose corn syrup and/or sugar. You can also try different brands. Tab contains saccharin and Diet Rite uses a combination of artificial sweeteners, giving them a slightly different density.


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