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B.S.¹	a college degree earned in a science, such as biology or chemistry, after four years of study. "B.S." is an abbreviation of "Bachelor of Science."
chemical	of or having to do with the science of chemistry. [1/3 definitions]
chemist	one who is active or expert in the field of chemistry.
chemistry	Chemistry is one of the sciences. In chemistry, people study the basic substances that all things are made of. Iron, oxygen, and gold are some examples of basic substances. In chemistry, people also study what happens when they put basic substances together.
chemistry lab	in a school, a place where students studying chemistry can observe chemical reactions and carry out small experiments.
compound¹	In chemistry, a compound is a substance formed by combining two or more chemical elements in certain amounts. When the elements are combined, they make a new thing that is different from the parts that make it up. For example, some elements that are completely safe when they are separate could make up a compound that can explode. Or, two elements that are dangerous by themselves could become very safe in a compound. [1/5 definitions]
element	any of the 118 substances that cannot be separated into simpler substances by using chemistry. Lead, gold, and oxygen are examples of elements. [1/4 definitions]
litmus paper	a small strip of treated paper used in chemistry. Litmus paper turns red in an acid and blue in a base.
neutral	neither an acid nor a base in chemistry. [1/4 definitions]

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