University:
Dakota State University
Course:
CHEM 112 | General Chemistry I
Academic year:

2024
Views:

350

Pages:

4
Author:

behend6abs

KEY Atomic and Naming 1.) Which of the following describes compounds? a.) they have atoms as their smallest particles. b.) they can be easily separated by physical methods. c.) they cannot be broken down into simpler substances. d.) they are composed of two or more elements in fixed proportions. 2.) Atoms form compounds through the interactions of which? a.) nuclei. b.) protons. c.) neutrons. d.) electrons. 3.) What are the valence electrons in an atom? a.) the total electrons. b.) the electrons in the outermost shell. c.) the number of electrons that always occupy the first shell. d.) the number of electrons that equal the protons. 4.) Which of the following is an example of an ion? a.) O b.) O2c.) O2 d.) 2O 5.) Which of the following is the smallest particle of an element? a.) ion. b.) atom. c.) molecule. d.) compound. 1 KEY 6.) What is the main difference between ionic and covalent bonding? Ionic bonding involves electron(s) being donated from one species to the other to form the bond where as in covalent the electron(s) are shared between the two species. 7.) How do ions form? I Atoms gain or lose protons II Atoms gain or lose neutrons III Atoms gain or lose electrons a.) I only b.) II only c.) III only d.) I and III 8.) What are the names of the following? a.) Ca2+ ____________Calcium ion____________ b.) K ____________Potassium_____________ c.) K+ ____________Potassium ion___________ d.) S2- ____________Sulphur ion_____________ e.) SO42- ____________Sulphate ion____________ f.) NH4+ ____________Ammonium ion___________ 9.) Draw Bohr diagrams for Magnesium, fluorine, and a sulphur ion. Magnesium Fluorine 2 KEY Sulphur -2 10.) For each of the following elements state the nearest noble gas, the number of electrons each element will lose or gain and the symbol for the ion that will form. a.) H _____Helium_____ _________-1________ ________H-1_______ b.) Li _____Helium_____ _________+1________ ________Li+1______ c.) S _____Argon______ _________-2________ ________S-2_______ d.) Ca _____Argon______ _________+2________ ________Ca+2______ 11.) Which of the following is barium nitrate? a.) Ba3N2 b.) BaNO3 c.) Ba(NO3)2 d.) Ba(NO2)2 12.) Classify the following as ionic or covalent and write its chemical formula. a.) ammonium sulphate _____ionic______ _____(NH4)2SO4____ b.) lead (II) chloride ______ionic______ _______PbCl2______ c.) aluminum sulphide ______ionic______ _______Al2S3______ d.) carbon disulphide ______covalent____ _______CS2_______ 13.) Classify the following as ionic or covalent and write its chemical name or formula. a.) KCl _____ionic______ __potassium chloride___ b.) (NH4)3N _____ionic______ ___ammonium nitride___ c.) P3Br6 ____covalent_____ _triphosphorus hexabromide_ 3 KEY d.) Cr2O3 _____ ionic______ _chromium (III) oxide_ e.) Mg3(PO4)2 _____ ionic______ _magnesium phosphate_ f.) NBr3 ____ covalent_____ __nitrogen tribromide__ g.) lead (IV) oxide _____ ionic______ ________PbO2_______ h.) Ca(MnO4)2 _____ ionic______ _calcium permanganate_ i.) magnesium sulphate _____ ionic______ ______MgSO4_____ 4

Ba(NO3)2 Ionic or Covalent

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