EX#02 Atoms Molecules and Ions (Chapter 2 openstax Chemistry-Atoms First) Exercise Set [Key] (1).pd

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CHEM 102. Chapter 02. Worksheet Exercise Set (Past Exam Questions)Dr. GunasekeraQuestions are similar to multiple choice exam questions. But you have to show work for full marks in this work.1.How many protons (p) and neutrons (n) are in an anion:At-?
2.The existence of electrons in atoms of elements was demonstrated by ____________________ after _________________ .
3.Calculate the number of electrons in 28.086 g of Si (Si = 28.086 g/mol, assume NA=6.022Γ—1023)# ?? ????? ?? 𝑆𝑖 ????? 𝑖? 28.086 ? ?????? =28.086 ?28.086 ?. ???βˆ’1= 1# ?? 𝑆𝑖 ????? 𝑖? 28.086 ? ?????? = (28.08628.086) ??? Γ— 6.022 Γ— 1023???βˆ’1# ?? ????????? 𝑖? ??? 𝑆𝑖 ???? = 14# ?? ????????? 𝑖? 28.086 ? ?????? ?? 𝑆𝑖 = ((28.08628.086) Γ— 6.022 Γ— 1023) Γ— 14 = 8.4308 Γ— 10244.How many total ions are there in 4.50 g of MgBr2? (Mg=24.305g/mol, Br=79.904g/mol, assumeNA=6.022Γ—1023)????? ???? ?? MgBr2= 24.305 + (2 Γ— 79.904) = 184.113 ?. ???βˆ’1# ?? ????? ?? MgBr2𝑖? 4.50 ? ?????? =4.50 ?
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Term
Fall
Professor
HUMMEL
Tags
Atom, Electron, Proton, Mole, multiple choice exam, Cathode Ray Tube

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