023 points question 5 1 how many neutrons are there

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0.23 points QUESTION 5 1. How many neutrons are there in an atom of lead whose mass number is 208? 126 290 208 82 None of the above 0.23 points QUESTION 6 1. Which of the following list gives the symbol of a transition metal, a nontransition metal, and a non-metal in that order ? Fe, Cl, Ca Na, In, Cl Ca, Fe, Ar Na, Fe, Cl Fe, In, Ar 0.23 points QUESTION 7 1. Sodium peroxide is an oxidizer used to bleach animal and vegetable fibers. What is its formula? NaO 2 Na 2 O NaO Na 2 O 2 0.23 points QUESTION 8
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1. Which one of the following name/formula combinations is incorrect ? ammonia /NH 3 monocarbon tetrachloride/CCl 4 dinitrogen trioxide/N 2 O 3 diphosphorus pentoxide/P 2 O 5 0.23 points QUESTION 9 1. What is the name of the acid formed when HCN gas is dissolved in water? cyanous acid hydrocyanic acid cyanic acid hydrocyanous acid 0.23 points QUESTION 10 1. A new element X exists naturally as three isotopes: x isotope mass (g/mole) abundance 24 12 X 23.985 66.00 25 12 X 24.986 20.00 26 12 X 25.983 14.00 Calculate the atomic weight in g/mole of element X. 24.9 8 33.3 3 2,44 6 24.4 6 0.23 points QUESTION 11 1. Calculate the molar mass of magnesium nitrate, Mg(NO 3 ) 2 , 148.31 g/mol 179.31 g/mol 210.31
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g/mol 86.31 g/mol 0.23 points QUESTION 12 1. What is the mass of 7.80 × 10 18 carbon atoms? 1.56 x 10 - 4 g 1.30 x 10 - 5 g 7.80 x 10 18 g 6.43 x 10 3 g 12.01 g 0.23 points QUESTION 13 1. A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of the following could be the molecular formula of this compound?
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  • Fall '19
  • Atom, Chemical element, Lecturer, NAo

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