# 2 Minute Drill Homework Complete the Chemical Equation worksheet Learner Objective Learner will be able to balance the reactants and products of a chemical.

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2 Minute Drill Homework Complete the Chemical Equation worksheet Learner Objective Learner will be able to balance the reactants and products of a chemical reaction equation.

Lec: Balancing Chemical Equations

NaOH + HCl NaCl + H 2 O When balancing a chemical equation the quantity and types of elements in the reactants has to be equal to the quantity and types of elements in the products.

NaOH + HCl NaCl + H 2 O Step 1. Break the reactants and products down into the type of elements. NaNa OO HH ClCl

NaOH + HCl NaCl + H 2 O Step 2. Place the quantity of each element in the reactants and products. Na:1Na:1 O:1O:1 H:2H:2 Cl:1Cl:1

NaOH + HCl NaCl + H 2 O Step 3. Determine if the quantities of each element are the same. If they are you will state “The chemical equation is balanced. If not, state which elements are not. Na:1Na:1 O:1O:1 H:2H:2 Cl:1Cl:1

Fe (s) + O 2 Fe 2 O 3 Step 1: FeFe OO

Fe (s) + O 2 Fe 2 O 3 Fe: 1Fe: 2 O: 2O: 3 Is this chemical equation balanced?

The chemical equation is not balanced because both Fe and O are not equal.

HCl + O 2 Cl 2 + H 2 O Is this chemical equation balanced?

Balancing a chemical equation with a Chemical Group Pb(NO 3 ) 2 + KI PbI 2 + KNO 3

Balancing a chemical equation with a Chemical Group Pb(NO 3 ) 2 + KI PbI 2 + KNO 3 NO 3 is a chemical group on both sides of the chemical equations.

Balancing an chemical equation with a Chemical Group Pb(NO 3 ) 2 + KI PbI 2 + KNO 3 Step 1 Pb: Pb: NO 3 : NO 3 : K: K : I: I:

Balancing an chemical equation with a Chemical Group Pb(NO 3 ) 2 + KI PbI 2 + KNO 3 Pb: 1Pb :1 NO 3 : 2NO 3 :1 K: 1K :1 I: 1I: 2 Is this chemical equation balanced?

Challenger Balancing a Chemical Equation when the number of elements on both sides are not equal.

Fe (s) + O 2 Fe 2 O 3 Fe: 1Fe: 2 O: 2O: 3

Fe (s) + 3O 2 2Fe 2 O 3 Step 3: (reactants)(products) Fe: 1Fe: 2 O: 2 x 3 = 6O: 3 x 2 = 6

Fe (s) + 3O 2 2Fe 2 O 3 Step 3:The increase in O on the product side causes the Fe to increase too and now needs to be increased. Fe: 1Fe 2 x 2 = 4 O: 2 x 3 = 6O: 3 x 2 = 6

4 Fe (s) + 3 O 2 2 Fe 2 O 3 Fe 1 x 4 = 4Fe 2 x 2 = 4 O 2 x 3 = 6O 3 x 2 = 6

4 Fe (s) + 3 O 2 2 Fe 2 O 3 What does this chemical reaction make?

4 Fe (s) + 3 O 2 2 Fe 2 O 3 What does this chemical reaction make? Answer: Rust!

Balancing an chemical equation with a Chemical Group Pb(NO 3 ) 2 + KI PbI 2 + KNO 3 Pb: 1Pb :1 NO 3 : 2NO 3 :1 K: 1K :1 I: 1I: 2

Pb(NO 3 ) 2 + KI PbI 2 + 2KNO 3 Pb: 1Pb :1 NO 3 : 2NO 3 :1 x 2 =2 K: 1K :1 I: 1I: 2

Pb(NO 3 ) 2 + 2KI PbI 2 + 2KNO 3 Pb: 1Pb :1 NO 3 : 2NO 3 :1 x 2 = 2 K: 1 x 2 = 2K :1 x 2= 2 I: 1I: 2

Pb(NO 3 ) 2 + 2KI PbI 2 + 2KNO 3 Pb: 1Pb :1 NO 3 : 2NO 3 :1 x 2 =2 K: 1 x 2 = 2K :1 x 2= 2 I: 1x 2 = 2I: 2

H 2 SO 4 + NaOH HOH + Na 2 SO 4

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