key1A - A Chemistry 1211K Test I MULTIPLE CHOICE (3 points...

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Chemistry 1211K Test I MULTIPLE CHOICE (3 points each) 1) A cube of an unknown metal measures 0.161 cm on one side. The mass of the cube is 36 mg. Which of the following is most likely the unknown metal? Metal Density (g/cm 3 ) Rhodium 12.4 Copper 8.96 Niobium 8.63 Vanadium 6.11 A) copper B) rhodium C) zirconium D) niobium 2) Of the three types of radioactivity characterized by Rutherford, which is/are electrically charged? A) beta-particles B) alpha-particles C) alpha-particles and beta-particles D) alpha-particles, beta-particles, and gamma-rays 3) Isotopes are atoms that have the same number of __________ but differing number of __________. A) neutrons, electrons B) protons, electrons C) protons, neutrons D) electrons, protons 4) The temperature of 25 o C is __________ in Kelvin. A) 248 B) 138 C) 298 D) 103 5) The atomic masses in the periodic table are not integral numbers. For example, carbon is listed as 12.01115 instead of 12.00000. Why? A) Our technology does not allow for exact measurement of such a small quantity. B) Atomic masses are measured in real samples that are always contaminated with other elements. C) There is a theoretical uncertainty in the masses of atoms. D) Atomic masses listed in the periodic table are weighted averages of naturally occurring isotopes. 6)
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key1A - A Chemistry 1211K Test I MULTIPLE CHOICE (3 points...

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