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Topic 5: Chemical formu
. las and Chemical Equations
3. Ratio of atoms or ions in formulas: Determining ratio of composition in formulas
1. In the compound Al2S3, the mole ratio of aluminum to sulfur is 4) 27 : 16
3) 13 : 16
2) 3 : 2
1) 2 : 3
2. What is the simplest ratio of carbon to hydrogen atoms in the formula C4 H10?
1) 4 : 10 2) 2 : 5 3) 1 : 5 4) 10 : 4
3. What is the ratio of sodium ion to phosphate ion in the formula Na3PO4 ?
1) 4 : 3 2) 3 : 4 3) 1 : 3 4) 3 : 1
4. In a sample of solid Ba(NO3)2, the ratio of barium ions to nitrate ions is
1) 1 : 1 2) 1 : 2 3) 1 : 3 4) 1 : 6
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Teacher Preview Copy
5. What is the ratio of ammonium ion to sulfate ion in the formula (NH4)2SO4 ? 4) 4 : 1
2) 1 : 2
3) 8 : 4
1) 2 : 1
6. The ratio of nitrogen to hydrogen in a molecule of ammonia is
1) 1 : 1 2) 2 : 1 3) 1 : 3 4) 3 : 1
7. In the compound Al2O3, the ratio of aluminum to oxygen is
1) 2 grams of aluminum to 3 grams of oxygen
2) 3 grams of aluminum to 2 grams of oxygen
3) 2 moles of aluminum to 3 moles of oxygen
4) 3 moles of aluminum to 2 moles of oxygen
8. What is the ratio of lithium to sulfur in the formula Li2S?
1) 2 moles of lithium to 1 mole of sulfur
2) 1 mole of lithium to 2 moles of sulfur
3) 2 molecule of lithium to 1 molecule of sulfur
4) 1 molecule of lithium to 2 molecule of sulfur
4. Types of chemical formulas: Recalling definitions and facts
1. A type of formula showing the simplest ratio in which atoms are combined is called
3) A structural formula
1) A molecular formula
2) An empirical formula 4) A condensed formula
2. A formula showing a true composition of a substance is the
1) Molecular formula 3) Structural formula
2) Empirical formula 4) Binary formula
3. Which is likely to show how atoms in a compound are bonded together?
3) A structural formula
1) A molecular formula 4) An electron formula
2) An empirical formula
4. A compound with just two atoms is classified as 3) A binary compound
1) A ternary compound
2) A polyatomic compound 4) A monatomic compound
5. In compounds, the sum of charges in all formulas must equal 4) 0
1) 3
3) 1
2) 2
210 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
. las and Chemical Equations
3. Ratio of atoms or ions in formulas: Determining ratio of composition in formulas
1. In the compound Al2S3, the mole ratio of aluminum to sulfur is 4) 27 : 16
3) 13 : 16
2) 3 : 2
1) 2 : 3
2. What is the simplest ratio of carbon to hydrogen atoms in the formula C4 H10?
1) 4 : 10 2) 2 : 5 3) 1 : 5 4) 10 : 4
3. What is the ratio of sodium ion to phosphate ion in the formula Na3PO4 ?
1) 4 : 3 2) 3 : 4 3) 1 : 3 4) 3 : 1
4. In a sample of solid Ba(NO3)2, the ratio of barium ions to nitrate ions is
1) 1 : 1 2) 1 : 2 3) 1 : 3 4) 1 : 6
Teacher Preview Copy
Teacher Preview Copy
5. What is the ratio of ammonium ion to sulfate ion in the formula (NH4)2SO4 ? 4) 4 : 1
2) 1 : 2
3) 8 : 4
1) 2 : 1
6. The ratio of nitrogen to hydrogen in a molecule of ammonia is
1) 1 : 1 2) 2 : 1 3) 1 : 3 4) 3 : 1
7. In the compound Al2O3, the ratio of aluminum to oxygen is
1) 2 grams of aluminum to 3 grams of oxygen
2) 3 grams of aluminum to 2 grams of oxygen
3) 2 moles of aluminum to 3 moles of oxygen
4) 3 moles of aluminum to 2 moles of oxygen
8. What is the ratio of lithium to sulfur in the formula Li2S?
1) 2 moles of lithium to 1 mole of sulfur
2) 1 mole of lithium to 2 moles of sulfur
3) 2 molecule of lithium to 1 molecule of sulfur
4) 1 molecule of lithium to 2 molecule of sulfur
4. Types of chemical formulas: Recalling definitions and facts
1. A type of formula showing the simplest ratio in which atoms are combined is called
3) A structural formula
1) A molecular formula
2) An empirical formula 4) A condensed formula
2. A formula showing a true composition of a substance is the
1) Molecular formula 3) Structural formula
2) Empirical formula 4) Binary formula
3. Which is likely to show how atoms in a compound are bonded together?
3) A structural formula
1) A molecular formula 4) An electron formula
2) An empirical formula
4. A compound with just two atoms is classified as 3) A binary compound
1) A ternary compound
2) A polyatomic compound 4) A monatomic compound
5. In compounds, the sum of charges in all formulas must equal 4) 0
1) 3
3) 1
2) 2
210 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
