Balancing Reactions

Choose the largest compound Make its coefficient 1 Choose any element in that compound that appears in only 1 other location

Balance that element with coefficients where that element appears Repeat until all elements are balanced Double if on half-unit

_ MnBr 3(aq) + _ F 2(g)  _ MnF 3(aq) + _ Br 2(g)

2 MnBr 3(aq) + 3 F 2(g)  2 MnF 3(aq) + 3 Br 2(g)

_ FeCl 3 + _ K 2 CO 3  _ Fe 2 (CO 3 ) 3 + _ KCl

_NaHCO 3 + Heat  _Na 2 CO 3 + _H 2 O + _CO 2

Drill: Balance Rxn __ Fe(NO 3 ) 3 + __ K 2 SO 4 __ Fe 2 (SO 4 ) 3 + __ KNO 3

__H 3 PO 4 + __NH 3  __(NH 4 ) 3 PO 4

__C 4 H 10 O 2 + __O 2  __CO 2 + __H 2 O

Types of Reactions

Single Displacement Double displacement Synthesis Decomposition Combustion

Single Displacement A Metal or hydrogen replaces the positive portion of a compound or a nonmetal does it for the negative portion

_ CaBr 2(aq) + _ F 2(g)  _ CaF 2(aq) + _ Br 2(g)

Double Displacement Two compounds exchange negative portions Change of phase a must

Double Displacement __ Ca(NO 3 ) 2 + __ K 2 SO 4 __ CaSO 4 + __ KNO 3

Synthesis Smaller molecules or elements combine to make larger molecules

Synthesis _CaO + _CO 2  _CaCO 3

Decomposition Larger molecules break down to form smaller molecules or elements

Decomposition _MgCO 3 + Heat  _MgO + _CO 2

Combustion A carbon compound is combined rapidly with oxygen producing carbon dioxide & water

Combustion __C 5 H 12 + __O 2  __CO 2 + __H 2 O

Name substances, then balance & classify the following reactions

___H 2 SO 4 + ___Al(OH) 3 ___Al 2 (SO 4 ) 3 + ___H 2 O

___K 3 PO 4 + ___Pb(NO 3 ) 2 ___Pb 3 (PO 4 ) 2 + ___KNO 3

_ MnBr 3(aq) + _ F 2(g)  _ MnF 3(aq) + _ Br 2(g)

_ FeCl 3 + _ K 2 CO 3  _ Fe 2 (CO 3 ) 3 + _ KCl

CaCO 3(s) + H 2 O + CO 2 Ca(HCO 3 ) 2(aq)

__H 3 PO 4 + __NH 3  __(NH 4 ) 3 PO 4

__C 4 H 10 O 2 + __O 2  __CO 2 + __H 2 O