Chapter 24
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Chapter 24. Chemical Reactions. In a chemical Reaction . . . Reactants. Products. New substances produced. Substances reacting. Any state of matter Follow law of conservation of mass Example: Which are the reactants? Which are the products? NaCl  Na + + Cl - 2HgO O 2 + 2Hg

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Chapter 24

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Chapter 24

Chapter 24

Chemical Reactions


In a chemical reaction

In a chemical Reaction . . .

Reactants

Products

New substances produced

  • Substances reacting

  • Any state of matter

  • Follow law of conservation of mass

  • Example: Which are the reactants? Which are the products?

  • NaCl Na+ + Cl- 2HgO O2 + 2Hg

  • NiCl2 + 2NaOHNi(OH)2 + 2NaCl


Law of conservation of mass

Law of Conservation of Mass

  • In the late 1700s

  • Antoine Lavoisier

  • Mass is changed; NOT created or destroyed

    Example: 2HgO O2 + 2Hg

    10.0g = 0.7g + 9.3g

    Try: Zn + 2HCl  H2 + ZnCl2

    15.0g + 3.2g = 6.2g + _____

12.0g


Chemical changes in equations

Chemical Changes in Equations

  • Table 1 on page 740

  • We use formulas and equations to shorten the writing process

  • It helps us see how many atoms are involved


Balancing equations nuts and bolts lab revisited

Balancing Equations - Nuts and Bolts Lab Revisited

1. Build these compounds if

Boltium (Bo) and Nutter (Nu)

Bo2Nu3BoNuNu

How many of each compound to balance

Bo2Nu3  BoNu + Nu


Balancing equations nuts and bolts lab revisited1

Balancing Equations - Nuts and Bolts Lab Revisited

2. Build these compounds

BoNu2Bo3Nu

How many of each compound to balance

BoNu2  Bo3 + Nu


Balancing equations nuts and bolts lab revisited2

Balancing Equations - Nuts and Bolts Lab Revisited

3. Build these compounds

Bo2Nu2Bo3Nu

How many of each compound to balance

Bo3 + Nu  Bo2Nu2


Balancing equations

Balancing equations

Steps

Example

Lithium metal treated with water, a hydrogen gas and a lithium hydroxide are produced: Li (s) + H2O  LiOH + H2 (g)

Li 1 = 1

H 2 = 1 + 2

O 1 = 1

  • Write chemical equation with balanced molecules (cheat sheet for poly + diatomic)

  • Check equation for atom balance


Balancing equations1

Balancing equations

Steps

Example

Li (s) + H2O  LiOH + H2 (g)

4Li (s) + 4H2O  4LiOH + 2H2 (g)

Li 4 = 4

H 8 = 4 + 4

O 4 = 4

3. Choose coefficients to balance it

4. Recheck number of atoms


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