CHM 151Chapter 2 Questions answers

CHM 151Chapter 2 Questions answers - (0.7899 x...

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CHM 151 Chapter 2 Questions 1. What are the main subatomic particles that make up the atom? Proton, neutron, electron 2. What are the relative charges of each particle? Proton positive, neutron no charge, electron negative 3. What are their relative sizes and masses? Proton and neutron, mass is 1 amu; electron mass is approx 1/2000 amu 4. Define atomic number and atomic mass. Atomic number: number of protons in the nucleus of an atom Mass number: total number of protons and neutrons in the nucleus of an atom 5. Which of these can vary without changing the identity of the element? Mass number; number of neutrons can vary 6. How many protons, neutrons, and electrons are there in the following atoms? a. 40 Ar 18p; 22n; 18e b. 65 Zn 30p; 35n; 30e c. 70 Ga 31p; 39n; 31e d. 80 Br 35p; 45n; 35e e. 184 W 74p; 110n; 74e f. 243 Am 95p; 148n; 95e
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7. Naturally occurring magnesium has the following isotopic abundances: 24 Mg 78.99% 23.98504 amu 25 Mg 10.00% 24.98584 amu 26 Mg 11.01% 25.98259 amu What is the average atomic mass of magnesium?
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Unformatted text preview: (0.7899 x 23.98504) + (0.1000 x 24.98584) + (0.1101 x 25.98259) = 24.305050 8. Fill in the gaps in the following table: Symbol 59 Co 3+ 80 Se 2-192 Os 2+ 200 Hg 2+ Protons 27 34 76 80 Neutrons 32 46 116 120 Electrons 24 36 74 78 Net charge 3+ 2-2+ 2+ 9. Name the following ionic compounds: a. 2MgO magnesium oxide b. AlCl 3 aluminum chloride c. Li 3 PO 4 lithium phosphate d. Ba(ClO 4 ) 2 barium perchlorate e. Cu(NO 3 ) 2 copper (II) nitrate f. Fe(OH) 2 iron (II) hydroxide g. Ca(C 2 H 3 O 2 ) 2 calcium acetate h. Cr 2 (CO 3 ) 3 chromium (III) carbonate i. K 2 CrO 4 potassium chromate j. (NH 4 ) 2 SO 4 ammonium sulfate 10. Write the chemical formulas for the following compounds. a. Aluminum hydroxide Al(OH) 3 b. Potassium sulfate K 2 SO 4 c. Copper (I) oxide Cu 2 O d. Zinc nitrate Zn(NO 3 ) 2 e. Mercury (II) bromide HgBr 2 f. Iron (III) carbonate Fe 2 (CO 3 ) 3 g. Sodium hypobromite NaBrO...
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CHM 151Chapter 2 Questions answers - (0.7899 x...

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