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3 cards from this section. Quick, good the night before a test.
What does H₂O represent?
Think about the common substances you know.
How many atoms of oxygen are in carbon dioxide?
Look closely at the subscript in the formula.
What does the formula H₂O represent?
Think of the liquid we drink every day.
Valency refers to the number of atoms in a molecule.
Remember what valency indicates about an atom's behavior.
Given the compounds Na₂S and CaCl₂, determine the number of individual ions present in each compound.
Consider the subscript in each compound for ion count.
Construct the formula for a compound formed between aluminum (Al) and the sulfate radical (SO₄²⁻).
Use the criss-cross method to balance the ions.
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