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Living things have about 15 disintegrations per minute per gram of carbon.

Because living things constantly interchange carbon atoms, the amount of carbon-14 remains constant, but when organisms die, no new carbon-14 enters the organism.

For students, understanding the general architecture of the atom and the roles played by the main constituents of the atom in determining the properties of materials now becomes relevant.

Having learned earlier that all the atoms of an element are identical and are different from those of all other elements, students now come up against the idea that, on the contrary, atoms of the same element can differ in important ways. 79.) In this lesson, students will be asked to consider the case of when Frosty the Snowman met his demise (began to melt).

By the end of the 8th grade, students should know that all matter is made up of atoms, which are far too small to see directly through a microscope.

There were no eyewitnesses, but there are several suspects. You need to determine the exact time at which Frosty was put into the funnels to melt away, leaving no trace.

On a separate sheet of paper, immediately record the volume of Frosty's melted remains (water) in your graduated cylinder and note the time on the clock.

Make a data table and, at regular intervals (you decide how long), record the time on the clock and the volume of water in the graduated cylinder.

Stop after about 30 minutes, unless Frosty has completely melted earlier.

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