TYPES OF CHEMICAL REACTIONS SYNTHESIS (COMPOSITION), DECOMPOSITION AND REPLACEMENT (SINGLE AND DOUBLE), AND COMBUSTION
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1 TYPES OF CHEMICAL REACTIONS SYNTHESIS (COMPOSITION), DECOMPOSITION AND REPLACEMENT (SINGLE AND DOUBLE), AND COMBUSTION
2 YOU CAN THINK OF ATOMS AS PEOPLE GETTING TOGETHER AS COUPLES... Analogy One person A couple Switching partners Chemical Reaction An ion or element A compound A replacement reaction
3 THE GET TOGETHER
4 SYNTHESIS
5 1. SYNTHESIS Example C + O 2 C + O O O C O General: A + B AB
6 EX. SYNTHESIS REACTION
7 PRACTICE Predict the products. 2 Na (s) + Cl 2(g) 2 NaCl (s) Mg (s) + F 2(g) MgF 2(s) 2 Al (s) + 3F 2(g) 2 AlF 3(s)
8 DECOMPOSITION
9 DECOMPOSITION
10 2. DECOMPOSITION Example: NaCl Cl Na Cl + Na General: AB A + B
11 EX. DECOMPOSITION REACTION
12 SINGLE REPLACEMENT REACTIONS
13 SINGLE REPLACEMENT REACTIONS
14 3. SINGLE DISPLACEMENT Example: Zn + CuCl 2 Zn was oxidized Went from neutral (0) to (+2) Cl Cu Cl + Zn Cl Zn Cl + Cu Cu was reduced Went from (+2) to Neutral (0) General: AB + C AC + B
15 EX. SINGLE REPLACEMENT REACTION
16 SINGLE REPLACEMENT REACTIONS Write and balance the following single replacement reaction equation: Zn (s) + 2HCl (aq) ZnCl 2 + H 2(g) 2 NaCl (s) + F 2(g) 2 NaF (s) + Cl 2(g) 2Al (s) + 3 Cu(NO 3 ) 2(aq) 3 Cu (s) + 2 Al(NO 3 ) 3(aq)
17 DOUBLE REPLACEMENT REACTION
18 DOUBLE REPLACEMENT REACTION
19 4. DOUBLE DISPLACEMENT Example: MgO + CaS Mg O + Ca S Mg S + Ca O General: AB + CD AD + CB
20 DOUBLE REPLACEMENT REACTIONS Think about it like foil ing in algebra, first and last ions go together + inside ions go together Example: AgNO 3(aq) + NaCl (s) AgCl (s) + NaNO 3(aq) Another example: K 2 SO 4(aq) + Ba(NO 3 ) 2(aq) 2KNO 3(aq) + BaSO 4(s)
21 PRACTICE Predict the products. 1. HCl (aq) + AgNO 3(aq) 2. CaCl 2(aq) + Na 3 PO 4(aq) 3. Pb(NO 3 ) 2(aq) + BaCl 2(aq) 4. FeCl 3(aq) + NaOH (aq) 5. H 2 SO 4(aq) + NaOH (aq) 6. KOH (aq) + CuSO 4(aq)
22 COMBUSTION
23 HOW DOES THIS ANALOGY BREAK DOWN? People in Relationships People can switch partners whenever they want Chemical Reactions The ions or elements in a compound switch partners according to rules We usually just think about one partner and one couple People don t assume different states of matter People aren t swimming in water In chemistry, we usually are dealing with billions of particles reacting at once In double replacement reactions, there will be a change of state (a solid, liquid, or gas is formed) Displacement reactions generally happen in aqueous solutions
24 LET S LOOK AT THE REACTIONS IN MORE DETAIL Synthesis Decomposition Single-Replacement Double-Replacement Combustion
25 COMBUSTION WHAT ARE SOME TYPES OF COMBUSTION YOU ARE FAMILIAR WITH? EVERY CELL IN YOUR BODY IS CARRYING OUT COMBUSTION
26 COMBUSTION Oxygen combines with a metal, nonmetal, or compound Creates a metal oxide, non-metal oxide, or 2 or more oxides Releases energy heat, light Can be a slower process too
27 SYNTHESIS 2 or more reactants combine to make a product A B AB
28 DECOMPOSITION A compound breaks down into two or more substances
29 SINGLE REPLACEMENT A metal replaces a hydrogen A metal replaces another metal We use an activity series to predict which metals are stronger and can knock out other metals from compounds
30 ACTIVITY SERIES The most active metals are at the top. These will replace metals below them. The halogens are also listed in order of most active at the top to least active at the bottom. More active elements replace less active elements in single replacement reactions
31 SINGLE REPLACEMENT EXAMPLES 2 AgNO3 + Cu Cu(NO3)2 + 2 Ag Fe + Cu(NO3)2 Fe(NO3)2 + Cu Zn + 2HCL ZnCl2 + H2
32 DOUBLE REPLACEMENT REACTIONS Produces a precipitate, liquid or gas All four of the ions switch partners Aqueous solution
33 DOUBLE REPLACEMENT EXAMPLES AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) CaCO3(aq) + 2 HCl(aq) CaCl2(aq) + H2O(l) + CO2(g) HCl(aq) + NaOH(aq) HOH(l) + NaCl(aq)
34
35 Steps to determine type of reaction HOW TO IDENTIFY A REACTION Be systematic it will help you identify the reaction type and the products! Write the chemical equation Determine what is happening in the reaction Use the table to identify the type of reaction Check your answer by comparing the chemical equation to the generic equation
36 Example: Identifying a reaction HOW TO IDENTIFY A REACTION Example: Solid calcium oxide and carbon dioxide gas react to produce solid calcium carbonate CaO (s) + CO2 (g) CaCO3 (s) 2 compounds are reacting to form one compound This is a synthesis reaction A + B AB
37 SUMMARY THE MAIN TYPES OF REACTIONS Combustion reaction with oxygen Synthesis two compounds or elements getting together Decomposition One compound splitting up Replacement Another ion moves in REPLACEMENT REACTIONS: 2 TYPES Single replacement a stronger cation steps in and replaces a weaker anion Double replacement 2 cations switch places, forming a precipitate, a liquid, or a gas
38 YOU TRY IT! Work on these examples together in pairs. Write the reaction Balance the equation Classify the reaction Be prepared to present your results on the board! Magnesium and Hydrochloric acid form Magnesium Chloride and Hydrogen Carbon Dioxide and Water form Carbonic Acid (H2CO3) Silver Nitrate and Sodium Chloride form Silver Chloride and Sodium Nitrate Heating sodium bicarbonate (NaHCO3) releases water and carbon dioxide and sodium carbonate
39 YOU TRY IT! Magnesium and Hydrochloric acid form Magnesium Chloride and Hydrogen: Mg + HCl MgCl + H2 (skeleton equation) 2Mg + 2HCl 2MgCl + H2 (balanced equation) Single replacement (reaction type) Carbon Dioxide and Water form Carbonic Acid (H2CO3): CO2 + H2O H2CO3 (skeleton equation) CO2 + H2O H2CO3 (it s already balanced!) Synthesis (reaction type)
40 YOU TRY IT! Silver Nitrate and Sodium Chloride form Silver Chloride and Sodium Nitrate AgNO3 + NaCl AgCl + NaNO3 (skeleton equation) AgNO3 + NaCl AgCl + NaNO3 (already balanced) Double replacement (reaction type) Heating sodium bicarbonate releases water and carbon dioxide and sodium carbonate NaHCO 3 Na 2 CO 3 + H 2 O + CO 2 (skeleton equation) 2NaHCO 3 Na 2 CO 3 + H 2 O + CO 2 (balanced equation) Decomposition (reaction type)
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