30) What is the formula for an lonic compound made of barium and nitrogen B) Ba2

Question

30) What is the formula for an lonic compound made of barium and nitrogen B) Ba2N3 E) none of the above 31) Which among the following elements does NOT exist as a diatomic molecule in nature A) fluorine B) neon C) nitrogen D) hydrogen E) none of the above 311 32) Fluorine is considered which of the following? A) molecular compound B) molecular element C) atomic element D) ionic compound E) none of the above 33) What is the correct value for Avogadro's number? 33) A) 6.022 1023 B) 6.022 1023 C 6.022 1033 D) 6.023 1022 E) none of the above 34) 34) How many atoms are in 5.80 moles of He? A) 1.03 1023 B) 6.02 x 1023 C) 3.49 1024 D) 4.00 E) none of the above 35) 35) Which statement below accurately describes the contributions of Democritus? A) discovered the existence of electrons B) proposed the modern Atomic Theory C) ancient Greek philosopher who proposed that matter was not continuous D) created the modern periodic table E) none of the above 36) 36) Which statement below accurately describes the contributions of Thomson? A) created the modern periodic table B) proposed the modern Atomic Theory C) discovered the existence of electrons ) ancient Greek philosopher who proposed that matter was continuous E) none of the above

Explanation / Answer

30. Ba^2+   N^3-
     Ba3N2
D. Ba3N2
31. Neon(Ne) is monoatomic molecule
B.neon
32. F2 is molecular element
B. molecular element
33. B. 6.022*10^23
34. 1 mole    = 6.022*10^23
    5.8mole   = 6.022*10^23 *5.8   = 3.49*10^24
C.3.49*10^24
35. C. ancient Greek philospher who proposed that matter was not continuous.
36. C.discovered the existence of electrons

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