MidtermChem110F2010FormatB - Page 1 of 7 ExamI Format B...

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Page 1 of 7 ExamI Format B Instructor: Vahid Eskandari Chemistry 110 (Fall 2010) Midterm Nov 10 th 2010 (2.5 pts each question) Exam Format B 1. One of the main features of Dalton's atomic theory no longer considered valid is: All atoms of each element are identical in every respect. Which of the following is the best explanation of why this feature is no longer considered valid? a. The existence of isotopes b. Mass is conserved in a chemical change c. Nearly all of the mass of an atom is concentrated in the nucleus d. The total charge of the electrons of an atom exactly balances the positive charge of the nucleus e. The planetary model of the atom has been shown to be incorrect 2. Which group of elements contains only non-metals? 3. Which of the following statements is false ? 4. Two natural isotopes exist for an unknown element. 51.83% of the atoms have a mass of 106.90509 amu, and the remainder has a mass of 108.9047 amu. Calculate the atomic mass. 5. What is the formula of barium hydroxide octahydrate? a. Ba(OH) 2 • 8 H 2 O b. Ba(OH) 2 • 6 H 2 O c. B(OH) 3 • 8 H 2 O d. B(OH) 3 • 6 H 2 O e. B(OH) 3 + 8 H 2 O( ) 6. What are the formulas of the compounds magnesium sulfate and lithium bromite?
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