Ch. 2: “Chemistry of Life”

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Presentation transcript:

Ch. 2: “Chemistry of Life” Directed Reading: “Nature of Matter”

Fill in the blank. 1. A(n) _____ is the smallest unit of matter that cannot be broken down by chemical means. atom 2. A(n) _____ is a substance made of only one kind of atom. element 3. A(n) _____ is a weak chemical attraction between polar molecules. hydrogen bond

Fill in the blank. 4. A completely filled outer electron level makes an atom _____. stable 5. Atoms gain or lose _____ to form ions. electrons

Fill in the blank. 6. Water is an example of a(n) _____ compound. polar 7. Polar molecules have a(n) _____ distribution of electrical charges. unequal

What’s the difference? 8. A molecule is a group of two or more atoms that are held together by covalent bonds. An atom is the smallest unit of matter that cannot be broken down by chemical means. 9. A compound is a substance made by joining atoms of two or more elements. An element is a substance that is made up of only one kind of atom.