Chapter 9 RXNS EQNS Chemical Rxns Representing Chemical

Representing Chemical Rxns Symbols used to show physical states (s) – solid (l) –

Balancing Chem Eqns To balance eqns, must have correct coefficients in skeleton eqn Coefficients

Balancing Chem Eqns Steps for balancing eqns: 1. Write skeleton eqn 2. Counts atoms

Types of Chem Rxns Classify chem rxns to organize the different rxns that occur

Replacement Rxns Replacement 2 Rxns – Replaces element(s) in compound Types Replacement Rxns: Single

Replacement Rxns NOTE: A metal will not always replace another metal Due Most Active

Single Replacement Example https: //youtu. be/PNa. Zqn. Fw. IIQ

Types of Rxns Type of Reaction Definition Equation Synthesis Two or more elements or

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Chapter 9 RXNS & EQNS

Chemical Rxns

Representing Chemical Rxns

Representing Chemical Rxns Symbols used to show physical states (s) – solid (l) – liquid (g) – gas (aq) - aqueous When dissolved in water, said to be aqueous **Very important to show physical states of rxns reactants and products. These give clues about how rxn occurs!

Representing Chemical Rxns

Balancing Chem Eqns To balance eqns, must have correct coefficients in skeleton eqn Coefficients must be whole #’s describe lowest whole # ratio of amounts of all reactants and products

Balancing Chem Eqns Steps for balancing eqns: 1. Write skeleton eqn 2. Counts atoms in reactants 3. Count atoms in products 4. Change coefficient to make # atoms = 5. Write coefficients in lowest ratio 6. Double check work!!!

Example 1

Example 2

9. 2 – Classifying Chem Rxns

Types of Chem Rxns Classify chem rxns to organize the different rxns that occur daily Helps 4 give a better understanding of what is going on Types: Synthesis Combustion Decomposition Replacement

Synthesis Rxns

Decomposition Rxns

Combustion Rxns

Replacement Rxns Replacement 2 Rxns – Replaces element(s) in compound Types Replacement Rxns: Single Replacement Double Replacement

Replacement Rxns

Replacement Rxns NOTE: A metal will not always replace another metal Due Most Active to difference in reactivity Reactivity is ability to react with another substance Least Active

Example

Single Replacement Example https: //youtu. be/PNa. Zqn. Fw. IIQ

Replacement Rxns

Writing Double Replacement Rxns

Replacement

Types of Rxns Type of Reaction Definition Equation Synthesis Two or more elements or compounds combine to make a more complex substance Decomposition Compounds break down into simpler substances AB → A + B Single Replacement Occurs when one element replaces another one in a compound AB + C → AC + B Double Replacement Occurs when different atoms in two different compounds trade places A + B → AB AB + CD → AC + BD