PHOTOSYNTHESIS as a chemical reaction
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1 CHEMICAL REACTIONS
2 PHOTOSYNTHESIS as a chemical reaction SUNLIGHT CO 2 + H 2 O C 6 H 12 O 6 + O 2 REACTANTS PRODUCTS REACTANTS are the ingredients of a chemical reaction, always listed to the left of the arrow. The ingredients aka reactants of photosynthesis are: carbon dioxide CO 2 and water H 2 O PRODUCTS are the end results, made from the chemical reaction, always listed to the right of the arrow. The products of photosynthesis are: glucose C 6 H 12 O 6 and oxygen O 2 The arrow means yields to form indicating a change has occurred. NOTE that sunlight is written above the arrow, indicating sunlight is a catalyst, which functions to speed up the chemical reaction.
3 Photosynthesis as a chemical reaction (cont.) CO 2 (g) + H 2 O (l) C 6 H 12 O 6 (s) + O 2 (g) Chemical equations also reveal information about the phase of matter of reactants and products, usually with a symbol written after the compound name. CO 2 (g) indicates carbon dioxide is a gas H 2 O (l) indicates water is in the liquid phase O 2 (g) indicates oxygen produced is a gas C 6 H 12 O 6 (s) indicates glucose is a solid NaCl (aq) aq = aqueous, which indicates the substance is dissolved in water. For example saline solution in IV drips is a salt water mixture.
4 5 TYPES OF CHEMICAL REACTIONS SYNTHESIS DECOMPOSITION COMBUSTION SINGLE REPLACEMENT DOUBLE REPLACEMENT
5 SYNTHESIS A synthesis reaction combines two small reactants into a more complex product. Also known as combination reaction because reactants combine to form products H 2 (g) + O 2 (g) H 2 O (l) Na (s) + Br 2 (g) NaBr CO 2 + H 2 O C 6 H 12 O 6 + O 2 photosynthesis GENERIC EQUATION: A + B AB
6 DECOMPOSITION A decomposition reaction is the breakdown of a complex reactant into smaller, simpler products The decomposition reaction is the opposite of the synthesis reaction C 6 H 12 O 6 + O 2 CO 2 + H 2 O cell respiration H 2 O (l) H 2 (g) + O 2 (g) NaBr Na (s) + Br 2 (g) LOOK FOR ONLY 1 REACTANT AS AN IDENTIFYING FACTOR, the are no other reactants to interact with, all the reactant can do is break apart. GENERIC EQUATION: AB A + B
7 COMBUSTION The combustion reaction is easiest to identify because oxygen, O 2, is always a reactant and the products are always carbon dioxide CO 2 and water H 2 O. The other reactant is a hydrocarbon (hydrogen and carbon containing compound) C 3 H 8 + O 2 CO 2 + H 2 O C 2 H 5 OH + O 2 CO 2 + H 2 O GENERAL EQUATION: C X H Y + O 2 CO 2 + H 2 O FIRE NEEDS OXYGEN!
8 SINGLE REPLACEMENT a replacement reaction switches out one element for another. Also called single substitution reaction or single displacement reaction. Common with reactions between an element and an ionic compound Zn (s) + HCl (aq) Zn +2 Cl 2-1 (aq) + H 2 (g) element compound compound + element The zinc and the hydrogen switch places (cations switch) Cl 2 (g) + NaI (aq) NaCl (aq) + I 2 element compound compound + element The chlorine and the iodine switch places (anions switch) GENERAL EQUATION: A + BX AX + B OR X + CD CX + D
9 DOUBLE REPLACEMENT a double replacement reaction switches out two elements for another. Also called double substitution reaction or double displacement reaction. Common with reactions of ionic compounds with ionic compounds BaCl 2 + Na 2 SO 4 NaCl + BaSO 4 ionic compound + ionic compound ionic compound + ionic compound The barium and sodium switch places CuCl 2 + H 2 S CuS + HCl ionic compound + ionic compound ionic compound + ionic compound GENERAL EQUATION: A + B - + C + D A + D - + C + B -
10 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 Al 2 O 3 AgCl + K C 2 H 4 + O 2 NaOH + MgBr 2
11 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 Al 2 O 3 AgCl + K C 2 H 4 + O 2 NaOH + MgBr 2 First, identify the reaction type, then it is easier to predict which products will form
12 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 Al 2 O 3 AgCl + K C 2 H 4 + O 2 CO 2 + H 2 O This reaction has a hydrocarbon and O 2 as a reactant, so it must be a combustion reaction. Every combustion reaction makes the same 2 products. NaOH + MgBr 2
13 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 Al 2 O 3 Al + O 2 Decomposition reactions can be identified because there is only one reactant, which will split into simpler elements. Note that oxygen is a diatomic element. AgCl + K C 2 H 4 + O 2 CO 2 + H 2 O NaOH + MgBr 2
14 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 SF 2 Synthesis reactions can be identified because the reactants are always simple elements. The product of a synthesis reaction is the combination of both reactants. Al 2 O 3 Al + O 2 AgCl + K C 2 H 4 + O 2 CO 2 + H 2 O NaOH + MgBr 2
15 PREDICTING PRODUCTS OF CHEMICAL REACTIONS WRITE IN THE PRODUCTS OF THE CHEMICAL REACTION BELOW: S 8 + F 2 SF 2 Al 2 O 3 Al + O 2 AgCl + K K +1 Cl -1 + Ag Single replacement reactions can be identified because it is always a single element and an ionic compound on the reactant side of the equation. The product will show the switching of two cations (or two anions). The products form based on charge, the cation potassium K+ will bond to the anion Cl-. Don t forget to balance the charges. C 2 H 4 + O 2 CO 2 + H 2 O NaOH + MgBr 2 Na +1 Br -1 + Mg +2 (OH -1 ) 2 Double replacement reactions can be identified because it is always two ionic compounds in the reactant side of the reaction. The cations switch places, and bond to the anions. Don t forget to balance the charges with subscripts.
16 Using activity series The activity series is a list of elements and their relative reactivity The most reactive is listed at the top, the least reactive is listed at the bottom. Elements can displace an element lower on the list, less reactive. An element will never displace an element higher on the list, more reactive most reactive Least reactive
17 The activity series is used to predict the products of single replacement reactions. K + Ca(OH) 2 KOH + Ca Ni + Ca(OH) 2 reaction does not occur Since K is higher on the list then Ca, the reaction will occur. Since Ni is lower on the list, the reaction will not occur. Sometimes is best to consider the anion OH -1, which will prefer to ionically bond to the metal higher on the list.
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