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113LQ6 - Lecture Quiz#6(5 pts CHM 113 Dr Ron Briggs Name...

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Lecture Quiz #6 (5 pts) CHM 113 Dr. Ron Briggs The attached lecture quiz covers the remaining material from Ch. 7 (mostly sections 7.6-7.8). Much of this is a review of topics we have already discussed in other chapters. This take-home lecture quiz is due in Lecture on Thursday (10/27). We will not be going over the answers in class but they will be posted on BB by Thursday afternoon. Name: Recitation Section (circle one): R1 R2 R3 R4 R5 R6 R7 R8 R9 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 Recitation Table (circle one): H He Li Be B C N O F Ne Na Mg
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CHM 113 – Dr. Ron Briggs Summary/Practice Problems for Sections 7.6-7.8 1 Periodic Properties (Sections 7.6-7.8) Metals, Nonmetals and Metalloids Characteristic properties of metallic and non-metallic elements: Metallic Elements Nonmetallic elements Distinguishing luster (shine) Non-lustrous, various colors Malleable and ductile (flexible) as solids Brittle, hard or soft Conduct heat and electricity Poor conductors Metallic oxides are basic, ionic Nonmetallic oxides are acidic, molecular Cations in aqueous solution Anions, oxyanions in aqueous solution Metals Tend to have low ionization energies, and typically lose electrons (i.e. are oxidized ) when they undergo chemical reactions Metal oxides are bases , which react with acids to form salts and water: Metal oxide + acid salt + water MgO ( s ) + HCl ( aq ) MgCl 2 ( aq ) + H 2 O ( l ) Metal oxides that dissolve in water react to form metal hydroxides : Metal oxide + water metal hydroxide Na 2 O ( s ) + H 2 O ( l ) 2 NaOH ( aq ) Metalloids Have properties intermediate between the metals and nonmetals. Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. Unique properties make metalloids are useful in the semiconductor industry. Nonmetals The melting points of non-metals are generally lower than metals Seven of the nonmetals exist naturally as diatomic molecules : H 2 ( g ) , N 2 ( g ) , O 2 ( g ) , F 2 ( g ) , Cl 2 ( g ) , Br 2 ( l ) , I 2 ( s )
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CHM 113 – Dr. Ron Briggs Summary/Practice Problems for Sections 7.6-7.8 2 Nonmetals, when reacting with metals, tend to gain electrons and become anions: Nonmetal + Metal Salt 3Br 2 ( l ) + 2Al ( s ) 2 AlBr 3 ( s ) Nonmetal oxides can combine with bases to form salts Nonmetal oxide + base salt CO 2 ( g ) + 2 NaOH ( aq ) Na 2 CO 3 ( aq ) + H 2 O ( l ) 1) Indicate whether the following are properties of the metals (M) or of the nonmetals (N).
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