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Bios 251 Midterm Exam Questions & Answers With Explanations For Guaranteed Pass 2024

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1. Identify the Main Chemical Elements of the Body a. Oxygen b. Carbon c. Hydrogen d. Nitrogen 2. Distinguish and describe the three major subatomic particles and their various roles in chemistry (2.1) a. Electrons- move about in a large space surrounding the nucleus. They do not follow a fixe path or orbit but instead from a negatively charged cloud that envelops the nucleus. b. Protons- positively charged ions inside the nucleus c. Neutrons- uncharged ions inside the nucleus Elements of Atomic Particles d. Atomic Number- the number of protons in the nucleus e. Mass Number- sum of protons and neutrons in the nucleus f. Isotopes- Atoms of an element that have different numbers of neutrons, and therefore different mass numbers. g. Ion- is an atom that has a positive or negative charge because it has unequal numbers or protons and electrons h. Molecule- when two or more atoms share electrons i. Compound- a substance that contains atoms of two or more different elements. j. Free Radical- is an atom or group of atoms with an unpaired electron in the outermost shell

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