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Chem Exam #2
Ch 3
| Question | Answer |
|---|---|
| 1) Which of the following describes a substance in the solid physical state? A) The substance compresses negligibly. B) The substance has a fixed volume. C) The substance has a fixed shape. D) all of the above E) none of the above | D) all the above |
| 2) Which of the following describes a substance in the gaseous physical state? A) The substance has a fixed volume. B) The substance has a fixed shape. C) The substance compresses negligibly. D) all of the above E) none of the above | E) none of the above |
| 3) What is the term for a direct change of state from a solid to a gas? A) vaporization B) sublimation C) deposition D) condensation E) none of the above | B) sublimation |
| 4) Which of the following can be separated into two or more pure substances using a physical method? A) element B) mixture C) compound D) all of the above E) none of the above | B) mixture |
| 5) Water in a swimming pool contains dissolved sodium chloride and many other salts. Which of the following describes water in a swimming pool? A) element B) heterogeneous mixture C) homogeneous mixture D) compound E) none of the above | C) homogeneous mixture |
| 6) Brass is an alloy of copper and zinc and the percentage of copper can vary from 60-80%. Which of the following describes brass? A) homogeneous mixture B) element C) compound D) heterogeneous mixture E) none of the above | A) homogeneous mixture |
| 7) Which of the following chemical elements corresponds to the symbol B? A) barium B) boron C) beryllium D) bismuth E) none of the above | B) boron |
| 8) Which of the following chemical elements corresponds to the symbol Fe? A) fermium B) iron C) manganese D) fluorine E) none of the above | B) iron |
| 9) Which of the following chemical symbols corresponds to manganese? A) Mg B) Ma C) Sn D) Mn E) none of the above | D) Mn |
| 10) Which of the following elements is not one of the ten most abundant in Earth's crust, oceans, and atmosphere? A) oxygen B) silicon C) iron D) aluminum E) uranium | E) uranium |
| 11) Which of the following is a general characteristic of a metal? A) high density B) solid state C) malleable D) conductor of heat E) all of the above | E) all of the above |
| 12) Which of the following elements is an example of a semimetal? A) C B) Sn C) Sb D) Fe E) H | C) Sb |
| 13) Refer to a periodic table and predict which of the following is a solid nonmetal under normal conditions. A) As B) Cl C) Ar D) F E) Se | E) Se |
| 14) Cyanocobalamin, C63H88CoN14O14P, is vitamin B12. What is the number of atoms in one molecule of vitamin B12? A) 181 B) 12 C) 179 D) 180 E) none of the above | A) 181 |
| 15) Ammonium sulfate, (NH4)2SO4, is in fertilizer and replenishes nitrogen to the soil. What is the number of atoms in the chemical formula of ammonium sulfate? A) 20 B) 14 C) 15 D) 13 E) none of the above | C) 15 |
| 16) Which of the following is an example of a physical property? A) melting point B) physical state C) crystalline form D) color E) all of the above | E) all of the above |
| 17) Which of the following properties of kerosene is a chemical property? A) colorless liquid B) density, 0.730 g/mL C) flammable with oxygen D) soluble in gasoline E) boiling point, 174 °C | C) flammable with oxygen |
| 18) Which of the following is an example of a physical change? A) vaporizing B) melting C) crystallizing D) all of the above E) none of the above | D) all of the above |
| 19) Which of the following properties of ethyl alcohol is a chemical property? A) E.A. and formic acid produce rum flavor B) E.A. and sodium metal release a gas C) E.A. and sulfuric acid produce ethyl ether D)E.A. in animals causes intoxication | E) all of the above |
| 20) Which is an example of a physical change? A) grinding sucrose crystals producing powdered sugar B) smoking tobacco producing smoke and ash C) digesting starch producing glucose sugar D) adding vinegar to baking soda producing carbon dioxide | A) grinding sucrose crystals and producing powdered sugar |
| 21) Which of the following is an example of a chemical change? A) oxidation B) sublimation C) crystallization D) condensation E) none of the above | A) oxidation |
| 22) Which of the following is an example of a chemical change? A) boiling an egg B) baking a pie C) charring sugar D) cooking a steak E) all of the above | E) all of the above |
| 23) Which law states that mass of reactants before a chemical change is equal to the mass of products after a chemical change? A) L of conservation of energy B) L of conservation of mass and energy C) L of constant composition D) L of conservation of mass | D) law of conservation of mass |
| 24) If 2.43 g of magnesium reacts with oxygen to produce 4.03 g of magnesium oxide, what is the mass of reacting oxygen gas? A) 1.60 g B) 6.46 g C) 4.03 g D) 2.43 g E) impossible to predict from the given information | A) 1.60 g |
| 25) Which physical state demonstrates very low kinetic energy? A) solid state B) gaseous state C) liquid state D) all of the above E) none of the above | A) solid state |
| 26) When a cannonball is shot from a cannon, at what point in its flight is the potential energy of the cannonball at a maximum? A) in flight at maximum height B) in the cannon C) in flight near the ground D) on the ground E) in flight near the cannon | A) in flight at maximum height |
| 27) What happens to gaseous molecules when the temperature of a gas increases? A) K.E. & velocity remain constant. B) K.E. decreases & velocity increases. C) K.E. & velocity decrease. D) K.E. increases & velocity decreases. E) K.E. & velocity increase. | E) Kinetic energy and velocity increase. |
| 28) Which of the following is a form of energy? A) electrical B) chemical C) mechanical D) all of the above E) none of the above | D) all of the above |
| 29) A fuel cell contains H and O gas. They react explosively and the energy converts water to steam. The steam drives a turbine which turns a generator to produce electricity. What changes are involved in the process? A) chemical energy to heat energy B) | E) all of the above |
| 30) Conservation of mass and energy law, which of the following is true of mass and energy? A) Energy is not created nor destroyed B) The total mass and energy is constant C) Energy may be destroyed but not matter D) Mass may be destroyed but not energy | B) The total mass and energy is constant. |
| 31) Ethyl alcohol always contains 52% C, 13% H, and 35% O by mass. What law is illustrated by this statement? A) law of multiple proportions B) law of conservation of mass C) law of constant composition D) law of constant percentages E) none of the above | C) law of constant composition |
| 32) Which of the following terms best describes a carbonated beverage? A) heterogeneous mixture B) substance C) compound D) homogeneous mixture E) none of the above | A) heterogeneous mixture |
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