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Building Skills 3 pp. 30-31 Practice Problems
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For each formula, name the elements present and give the number of atoms of each element. BaF 2
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ANSWER! Barium (Ba): 1 Fluorine (F): 2
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For the following equation give an atom inventory: N 2 + 3 H 2 2NH 3
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Reactants N-2 H-6 Products N-2 H-6
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For each formula, name the elements present and give the number of atoms of each element. H 2 O 2
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Hydrogen (H): 2 Oxygen (O): 2
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For the following equation give a molecule inventory: N 2 + 3H 2 2NH 3
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One nitrogen molecule & three molecules of hydrogen yields two molecules of ammonia (NH 3 ).
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For the following equation give an atom inventory: O 2 + 2H 2 2 H 2 O
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Reactants O-2 H-4 Products O-2 H-4
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For each formula, name the elements present and give the number of atoms of each element. CaSO 4
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-Calcium (Ca): 1 -Sulfur (S): 1 -Oxygen (O): 4
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What are subscripts?
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The lower case numbers in a formula (the number 2 in H 2 0)
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For each formula, name the elements present and give the number of atoms of each element. Al 2 SO 4
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-Aluminum (Al):2 -Sulfur (S):1 Oxygen (O):4
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For the following equation list the reactants: O 2 + 2 H 2 2 H 2 O
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O2&H2O2&H2
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For each formula, name the elements present and give the number of atoms of each element. NH 4 NO 3
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Nitrogen (N):2 Hydrogen (H):4 Oxygen (O):3
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What is a coefficent?
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The large number out in front of a formula (like 2 in front of the 2 H 2 O).
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For each formula, name the elements present and give the number of atoms of each element. Li 2 CO 3
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- Lithium (Li): 2 -Carbon (C): 1 -Oxygen (O): 3
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For the following equation give a molecule inventory: CH 4 +4O 2 CO 2 + 2H 2 O
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One methane (CH 4 ) and four oxygen molecules yield one carbon dioxide and two water molecules.
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For each formula, name the elements present and give the number of atoms of each element. (NH 4 ) 3 PO 3
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-Nitrogen (N): 3 -Hydrogen (H): 12 -Phosphorus (P): 1 -Oxygen (O): 3
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List the reactants in the following equation: N 2 + 3 H 2 2 NH 3
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N 2 & H 2
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4NH 3 + 7O 2 4NO 2 + 6H 2 O Copy this equation. 1. Underline the coefficients. 2. Circle the molecules.
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Coefficients: 4NH 3 + 7O 2 4NO 2 +6H 2 O Molecules: NH 3 NO 2 O 2 H 2 0
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For each formula, name the elements present and give the number of atoms of each element. HC 2 H 3 O 2
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-Hydrogen (H): 4 -Carbon (C): 2 -Oxygen (O): 2
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List the products in the following equation: CH 4 + 4O 2 CO 2 + H 2 O
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For each formula, name the elements present and give the number of atoms of each element. Na 2 O
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ANSWER! Sodium (Na): 2 Oxygen (O): 1
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For each formula, name the elements present and give the number of atoms of each element. Al 2 O 3
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ANSWER! Aluminum (Al): 2 Oxygen (O): 3
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