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Percent Composition

Percent composition is just like determining your grade - the amount you got divided by the the whole amount.

With
compounds, you find the mass of a particular element and divide it by
the mass of the whole compound. So if you wanted to know the percent
composition of oxygen in water, you would take the mass of oxygen and
divide it by the mass of water.

We practiced some basics and the students measured the amount of sugar found in DubbleBubble bubble gum.

Students
each had a piece of gum and observed the gum by weighing it, drawing
it, and smelling it. The students chewed the gum for ten minutes. While
they were waiting we watched How Its Made on bubblegum.

After ten
minutes, students did more observations and re-weighed the gum. The gum
weighed less... why? Because the sugar dissolved and was lost. Using
this weight difference, students determined the percent composition of
sugar in the gum they chewed. They also can convert the grams to moles
and determine how many moles of sugar were in the gum.

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