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Topic 5: Chemical Formulas and Chemical Equations
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1. Chemical formula: Recalling concept facts and definitions
1. A chemical formula is used to represent symbols for
1) Mixtures 2) Isotopes 3) Isomers 4) Pure substances
2. A chemical formula can be used to represent compositions of
1) Elements, only 3) Elements and compounds
4) Compounds and mixtures
2) Compounds, only
3. Which list includes only types of chemical formulas?
1) Combustion, synthesis, and decomposition 3) Empirical, molecular, and substitution
2) Empirical, molecular, and structural
4) structural, combustion, and synthesis
4. A chemical formula is an expression of
1) Qualitative composition, only
2) Quantitative composition, only
Teacher Preview Copy
Teacher Preview Copy
3) Both qualitative and quantitative composition
4) Neither qualitative nor quantitative composition
5. Which information can be obtained from a chemical formula?
1) The type of atom in the formula, only 3) The number of neutrons in formula
2) The type of atom, and the number of each atom 4) The mass number of the formula
2. Number of atoms in formulas: Determining correct number of atoms in a given formula
1. What is the total number of hydrogen atoms in the formula NH4OH? 4) 5
1) 1
3) 4
2) 2
2. In the formula Na2SO4, how many sulfur atoms are in the formula? 4) 4
1) 0
2) 1
3) 2
3. How many atoms of hydrogen are there in the formula (NH4)3PO4 ?
1) 4 2) 7 3) 12 4) 3
4. What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3 ?
1) 1 2) 12 3) 3 4) 4
5. What is the total number of nitrate ions found in the formula NaNO3?
1) 1 2) 2 3) 3 4) 4
6. In the compound, Ca3(PO4)2, what is the total number of phosphate ions the formula?
4) 4
2) 2
1) 3
3) 8
7. How many atoms of oxygen are in the formula Al(ClO3)3.6H2O? 4) 15
2) 9
1) 6
3) 10
8. In the formula NH4Cl. 3H2O , how many atoms of hydrogen are there?
1) 4 2) 6 3) 9 4) 10
9. What is the total number of atoms in the formula CaSO4 ?
1) 3 2) 4 3) 5 4) 6
10. What is the total number of atoms in the formula Al2(SO4)3 ?
1) 17 2) 9 3) 14 4) 10
11. What is the total number of atoms in one formula unit of MgSO4. 7H2O? 4) 20
3) 16
2) 13
1) 27
12. The total number of atoms in the hydrate CuSO4.3H2O is 3) 15 4) 24
2) 12
1) 9
13. How many different kinds of atoms are present in NH4NO3?
1) 7 2) 9 3) 3 4) 4
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 209
.
1. Chemical formula: Recalling concept facts and definitions
1. A chemical formula is used to represent symbols for
1) Mixtures 2) Isotopes 3) Isomers 4) Pure substances
2. A chemical formula can be used to represent compositions of
1) Elements, only 3) Elements and compounds
4) Compounds and mixtures
2) Compounds, only
3. Which list includes only types of chemical formulas?
1) Combustion, synthesis, and decomposition 3) Empirical, molecular, and substitution
2) Empirical, molecular, and structural
4) structural, combustion, and synthesis
4. A chemical formula is an expression of
1) Qualitative composition, only
2) Quantitative composition, only
Teacher Preview Copy
Teacher Preview Copy
3) Both qualitative and quantitative composition
4) Neither qualitative nor quantitative composition
5. Which information can be obtained from a chemical formula?
1) The type of atom in the formula, only 3) The number of neutrons in formula
2) The type of atom, and the number of each atom 4) The mass number of the formula
2. Number of atoms in formulas: Determining correct number of atoms in a given formula
1. What is the total number of hydrogen atoms in the formula NH4OH? 4) 5
1) 1
3) 4
2) 2
2. In the formula Na2SO4, how many sulfur atoms are in the formula? 4) 4
1) 0
2) 1
3) 2
3. How many atoms of hydrogen are there in the formula (NH4)3PO4 ?
1) 4 2) 7 3) 12 4) 3
4. What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3 ?
1) 1 2) 12 3) 3 4) 4
5. What is the total number of nitrate ions found in the formula NaNO3?
1) 1 2) 2 3) 3 4) 4
6. In the compound, Ca3(PO4)2, what is the total number of phosphate ions the formula?
4) 4
2) 2
1) 3
3) 8
7. How many atoms of oxygen are in the formula Al(ClO3)3.6H2O? 4) 15
2) 9
1) 6
3) 10
8. In the formula NH4Cl. 3H2O , how many atoms of hydrogen are there?
1) 4 2) 6 3) 9 4) 10
9. What is the total number of atoms in the formula CaSO4 ?
1) 3 2) 4 3) 5 4) 6
10. What is the total number of atoms in the formula Al2(SO4)3 ?
1) 17 2) 9 3) 14 4) 10
11. What is the total number of atoms in one formula unit of MgSO4. 7H2O? 4) 20
3) 16
2) 13
1) 27
12. The total number of atoms in the hydrate CuSO4.3H2O is 3) 15 4) 24
2) 12
1) 9
13. How many different kinds of atoms are present in NH4NO3?
1) 7 2) 9 3) 3 4) 4
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 209