Some Physical Science questions...Help?

Are heterogeneous mixtures the least well-mixed of mixtures?

Chemical formulas are a shorthand way to represent ____.

What are the simplest pure substances?

In a chemical equation, the number that appears in front of the formula is called a(an)_____.

A(An)_____ uses symbols and formulas to describe a chemical reaction.

Stainless steel is a mixture of
a. iron and chromium
b. iron and calcium
c. iron and copper
d. iron and gold

Thanks.
 
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