73obymass a c4 h13o2 b ch3 o c ch4 o3 d cho e c2 h6 o

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Unformatted text preview: ) The total energy of a system remains constant. C) Energy can be converted from one type to another. D) Potential energy is associated with the motion of particles. E) Energy is the capacity to do work. 9) Determine the empirical formula for a compound that contains C, H and O. It contains 52.14% C and 34.73% O by mass. A) C4 H13O2 B) CH3 O C) CH4 O3 D) CHO E) C2 H6 O 10) Calculate the mass (in ng) of 2.33 x 10 20 atoms of oxygen. A) 1.62 × 107 ng B) 4.69 × 107 ng C) 6.19 × 106 ng D) 2.25 × 103 ng E) 3.73 × 106 ng 11) Determine the number of protons, neutrons and electrons in the following: 65 X 29 A) p+ = 36 B) p+ = 29 C) p+ = 29 D) p+ = 29 E) p+ = 36 n° = 29 n° = 29 n° = 36 n° = 36 n° = 36 e- = 36 e- = 36 e- = 29 e- = 36 e- = 29 7) 8) 9) 10) 11) 12) A substance composed of 2 or more elements in a fixed, definite proportion is considered A) a compound. B) a heterogeneous mixture. C) an alloy. D) a homogeneous mixture. E) a solution. 13) Choose the heterogeneous mixture from the list b...
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This note was uploaded on 02/12/2011 for the course CHEM 112 taught by Professor Sttaf during the Spring '03 term at Arkansas Pine Bluff.

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