Students are given a solid sample and asked to determine whether the sample is an element, compound, or mixture. One student observes that the sample is:

made up of particles of different colors, sizes, and shapes
some particles are softer than others
some shine while others appear dull
What can the students conclude about their sample?

It is an element.

It is a compound.

It is a homogeneous mixture.

It is a heterogeneous mixture.

A mixture is composed of substances that are not chemically combined together. The components of a mixture all retain their individual properties. So in a mixture, we can easily notice the individual components if the mixture is heterogeneous.

Clearly, the students were given a heterogeneous mixture because one student observed that the sample is;

made up of particles of different colors, sizes, and shapes

some particles are softer than others

some shine while others appear dull

Based on these observations, other students can agree that the sample is a mixture.

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