Physical Science - Module 18 Test
When asked to express ratios, use this format (X:X or X:X:X) where X represents the number of atoms of an element.
For example:
Give the ratio of atoms in NaCl. Answer: 1:1 (Because there is one Na and one Cl.)
Give the ratio of atoms in Ca3PO4. Answer: 3:1:4 (Because there are three Ca atoms, one P atom, and four O atoms.)
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