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Wednesday, February 3rd, 2016
Aim: Review of the Periodic Assessment (Continued)
16. Which statement is true when comparing 18O and 16O2-?
(1) 16O2- has more electrons than 18O
(2) 18O has more protons than 16O2-
(3) They both have the same number of neutrons
(4) They both have a noble gas electron configuration
8. Which of the following molecules is a nonpolar molecule?
1. HCl 2. CH4 3. H2O 4. NH3
19. At STP, which substance has metallic bonding?
1. ammonium chloride
2. barium oxide
3. iodine
4. silver
22. Which electron shell contains the valence electrons of a radium atom in the ground state?
1. 6th 2. 2nd 3. 7th 4. 8th
36. Which sample of matter does NOT sublime at room temperature and standard pressure?
(1) Solid naphthalene (moth balls)
(2) Solid dry ice
(3) Liquid diatomic bromine
(4) Solid Iodine crystals
2. During a flame test, a lithium salt produces a characteristic red flame. This red color is produced when
electrons in excited lithium atoms
1. are lost by the atoms
2. are gained by the atoms
3. return to lower energy states within the atoms
4. move to higher energy states within the atoms
9. Given the balanced equation representing a reaction: N2 + energy → N + N
Which statement describes this reaction?
1. Bonds are broken, and the reaction is endothermic.
2. Bonds are broken, and the reaction is exothermic.
3. Bonds are formed, and the reaction is endothermic.
4. Bonds are formed, and the reaction is exothermic
21. According to the kinetic molecular theory, which statement describes an ideal gas?
1. the gas particles are diatomic
2. energy is created when the gas particles collide
3. there are no attractive forces between the gas particles
4. the distance between the gas particles is small, compared to their size
13. Which process increases the potential energy of the particles of a sample?
1. condensation
2. deposition
3. freezing
4. vaporization
39. Which atom in the ground state requires the most amount of energy to remove its valence electron?
(1) lithium
(2) potassium
(3) rubidium
(4) sodium
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