Marie stirs 4 grams of salt and 10 grams of sand together in a paper cup. She asks Earl what he observes in the cup. He reports seeing grains of salt and grains of sand. What is the best description of what Marie made in the cup? Group of answer choices A mixture that must be chemically separated A compound that can be physically separated. A mixture that can be physically separated. A compound that has to be chemically separated.

Marie has created a mixture that can be physically separated. Mixtures are composed of two or more types of matter that retain their own chemical identity, and their components can be separated by physical methods, unlike compounds.

Explanation:

Marie created is best described as a mixture that can be physically separated. Mixtures are composed of two or more types of matter, like sand and salt in this case, which are present in varying amounts. These substances in a mixture retain their own chemical identity and can be separated by physical methods. Here, the salt and sand can be separated from each other following a simple method like sieving.

Heterogeneous mixtures, such as the one Marie created, have a composition that varies from point to point. That's to say, one part of the mixture may have more salt than sand, and vice versa in another different part. The key thing to remember about mixtures is that they do not require any chemical changes to separate the components, unlike compounds.

Take another common example of a heterogeneous mixture, Italian dressing—it consists of varying amounts of oil, vinegar, and herbs. Its composition can vary from point to point, a drop may be mostly vinegar, another might be primarily oil or herbs since these components separate on standing. Therefore, Marie's case is a classic example of a mixture, not a compound.

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