Introduction to General Chemistry
1. In the Lewis structure for SF2, which of the following is true? A. The central atom is sulfur. B. The central atom is fluroine. C. Sometimes sulfur is in the center; sometimes fluorine is in the center.
2. What word describes the molecular shape of CBr4? A. tetrahedral B. trigonal planar C. linear D. none of these
3. Which of the following has the smallest molar mass? A. SrCl2 B. MgCl2 C. CaCl2 D. FeCl2
4. Which of the following samples contains the greatest number of atoms? A. 1 mole CO2 B. 2 moles He C. 3 moles H2O D. 4 moles CO
5. SF2 is a __________ molecule. A. polar B. nonpolar
6. How many moles of H atoms are there in 0.600 moles of Ca(OH)2? A. 0.300 mol B. 0.600 mol C. 1.20 mol D. 2.40 mol
7.How many hydrogen atoms are in 1.3 mol of ammonia? A. 1.5 X 1023 B. 7.8 X 1023 C. 3.9 D. 2.3 X 1024
8. H2O is a __________ molecule. A. polar B. nonpolar
9. How many chloride ions are in 3.6 mol of CaCl2? A. 7.2 Cl— B. 6.022 X 1023 Cl— C. 4.3 X 1024 Cl— D. 2.2 X 1024 Cl—
10. CS2 is a __________ molecule. A. polar B. nonpolar
11. What is the molar mass of a hydrogen molecule? A. 1.01 g/mol B. 2.02 g/mol C. 3.03 g/mol D. 6.022 X 1023
12. In the Lewis structure for CF4, the number of lone pairs of electrons around the carbon atom is A. 0. B. 1. C. 2. D. 3.
13. Which of the following is true? The formula mass of a compound is equal to _______ A. the sum of the atomic masses of all of the atoms in the compound. B. the sum of the masses of all the protons in the compound. C. the sum of the masses of all the electrons in the compound. D. the sum of the masses of all the neutrons in the compound.
14. How many moles of N atoms are there in 0.882 moles of (NH2)2CO? A. 0.441 B. 0.882 C. 1.76 D. 3.53
15. If you have 7.86 X 1025 molecules of C3H8O, how many mol C3H8O of do you have? A. 4.73 X 1049 mol B. 7.86 X 1025 mol C. 766 mol D. 131 mol
16. What word describes the molecular shape of CH2S? A. tetrahedral B. trigonal planar C. linear D. none of these
17. If you have a sample of 2.5 mol of Fe2(SO4)3, how many mol of sulfate ion do you have? A. 0.83 mol SO42— B. 2.5 mol SO42— C. 5.0 mol SO42— D. 7.5 mol SO42—
18. Which of these molecules is the most polar? A. HBr B. CO2 C. CCl4 D. CBr4
19. What is the formula mass of Ca(ClO4)2,? A. 107.53 amu B. 174.98 amu C. 238.98 amu D. 139.53 amu
20. In the Lewis structure for NF3, which of the following is true? A. The central atom has 4 covalent bonds. Two single bonds and one double bond. B. The central atom has 3 covalent bonds and 1 lone pair of electrons. C. The central atom has 2 covalent bonds and 2 lone pairs of electrons. D. The central atom has 3 covalent bonds and no lone pairs of electrons.
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