Students are each given a 20 gram sample of an unknown solid compound in a clear plastic bag. they are instructed to break the material into smaller parts by gently hitting it with a hammer. some of the parts break into large chunks and some look like a fine powder. which statement correctly describes these broken pieces of the sample?

the pieces of fine powder are individual atoms.
the larger pieces are still compounds and the smaller pieces are elements.
each piece contains the same number of atoms.
each piece contains the same proportion of different elements.

Each piece contains the same proportion of different elements.

Explanation: Element is a pure substance which is composed of atoms of similar elements.

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.

The elements in the  compounds cannot be isolated by physical means.

Thus on breaking the material with hammer, the compounds remain as such and each piece would still contain the same proportion of different elements.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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