A + B → AB 2H 2(g) + O 2(g) → 2H 2 O (g) Elements or compounds are joined together.

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A + B → AB 2H 2(g) + O 2(g) → 2H 2 O (g) Elements or compounds are joined together

examples: Write the balanced equation for the formation of lithium oxide from its elements. 4 Li (s) + O 2 (g) → 2 Li 2 O (s) Write a balanced chemical equation for each unfinished formation reaction: calcium + nitrogen →... 3 Ca (s) + N 2 (g) → Ca 3 N 2 (s) silver + oxygen →... 4 Ag (s) + O 2 (g) → 2 Ag 2 O (s)

AB → A + B CaCl 2(s) → Ca (s) + Cl 2(g) Compounds are separated into constituent parts

examples: Write the balanced equation for the decomposition of solid magnesium sulfide into its elements. 8 MgS (s) → 8 Mg (s) + S 8 (s) Write the balanced equation for the decomposition of solid nickel (II) chloride into its elements. NiCl 2 (s) → Ni (s) + Cl 2 (g)

C x H x + O 2 (g) → CO 2 (g) + H 2 O (g) CH 4 (g) + 2 O 2 (g) → CO 2 (g) + 2 H 2 O (g) A hydrocarbon combines with oxygen and the products are always CO 2 (g) and H 2 O (g).

Zn (s) + 2 HCl (aq) → ZnCl 2(aq) + H 2(g) A single element replaces an element in a compound. A + BC → AC + B

examples: Write the balanced equations. Chlorine gas is added to a solution of aqueous nickel (III) bromide and the mixture is stirred. This produces aqueous nickel (III) chloride and liquid bromine. 3 Cl 2 (g) + 2 NiBr 3 (aq) → 2 NiCl 3 (aq) + 3 Br 2 (l) Zinc metal is placed into a solution of silver nitrate and allowed to sit. This produces aqueous zinc nitrate and solid silver metal. Zn (s) + 2 AgNO 3 (aq) → Zn(NO 3 ) 2 (aq) + 2 Ag (s)

read pages pg. 93 #’s 1 – 3 pg. 97 #’s 1 – 4

H 2 SO 4(aq) + 2 NaOH (aq) → Na 2 SO 4(aq) + 2H 2 O (l) An element from each of two compounds switch places. AB + CD → AD +CB

examples: Write the balanced equations. When aqueous copper (I) nitrate and aqueous potassium bromide are mixed, a precipitate of solid copper (I) bromide forms. Another product also forms. CuNO 3 (aq) + KBr (aq) → CuBr (s) + KNO 3 (aq) When aqueous aluminum chloride and aqueous sodium hydroxide are mixed, a precipitate of solid aluminum hydroxide forms. Another product also forms. AlCl 3 (aq) + 3 NaOH (aq) → Al(OH) 3 (s) + 3 NaCl (aq)

read pages A3.3 Check and Reflect #’s 1 - 8