January 2012 Chemistry Regents #11-20
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Questions | Answer | Link | Explanations |
11 The elements on the Periodic Table are arranged in order of increasing (1) atomic mass (3) molar mass(2) atomic number (4) oxidation number | 2 | link | atomic number |
12 What is the IUPAC name for the compound ZnO?(1) zinc oxide (2) zinc oxalate (3) zinc peroxide (4) zinc hydroxide | 1 | link
| zinc oxide Peroxides are only found with group 1 or 2 |
13 Which atom attains a stable valence electron configuration by bonding with another atom?(1) neon (3) helium (2) radon (4) hydrogen | 4 | link | Noble gases generally do not bond |
14 An ionic bond can be formed when one or more electrons are (1) equally shared by two atoms (2) unequally shared by two atoms (3) transferred from the nucleus of one atom to the nucleus of another atom (4) transferred from the valence shell of one atom to the valence shell of another atom | 4 | link | ionic transfer covalent shared |
15 Which sample of CO 2 has a definite shape and a definite volume?(1) CO2(aq) (2) CO2(g)(3)CO2(l) (4) CO2(s) | 4 |
| definite shape and a definite volume is a solid |
16 What occurs in order to break the bond in a Cl 2 molecule?(1) Energy is absorbed. (2) Energy is released. (3) The molecule creates energy. (4) The molecule destroys energy. | 1 | link
| breaking a bond absorbs energy |
17 A sealed, rigid l.0-liter cylinder contains He gas at STP. An identical sealed cylinder contains Ne gas at STP. These two cylinders contain the same number of (1) atoms (2) electrons (3) ions (4) protons | 1 | link | It should be "molecules", however both gases are Nobel Gases and do not bond. So their atoms are their molecules. |
18 Which statement describes a chemical change? (1) Alcohol evaporates. (2) Water vapor forms snowflakes. (3) Table salt (NaCl) is crushed into powder. (4) Glucose ( C6H12O6) and oxygen produce CO2 and H20. | 4 | link | chemical changes are reactions |
19 Which statement describes the particles of an ideal gas according to the kinetic molecular theory? (1) The gas particles are arranged in a regular geometric pattern.(2) The gas particles are in random, constant, straight-line motion. (3) The gas particles are separated by very small distances, relative to their sizes. (4) The gas particles are strongly attracted to each other. | 2 | link | Rules of the ideal gas |
20 Which sample of matter is classified as a substance?(1) air (3) milk (2) ammonia (4) seawater | 2 | link
| Substances are pure, not mixtures |