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Intro Chem Exam #2
| Question | Answer |
|---|---|
| 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 of 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) ethyl alcohol and formic acid produce rum flavor B) ethyl alcohol and sodium metal release a gas C) ethyl alcohol and sulfuric acid produce ethyl | |
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