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Chemical Reactions and Equations. Definition A chemical reaction is the process by which one or more substances change into one or more new substances.

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Presentation on theme: "Chemical Reactions and Equations. Definition A chemical reaction is the process by which one or more substances change into one or more new substances."— Presentation transcript:

1 Chemical Reactions and Equations

2 Definition A chemical reaction is the process by which one or more substances change into one or more new substances whose chemical and physical properties differ from those of the original substances.

3 Writing a Chemical Reaction Reactants are the elements or compounds you begin with Products are the elements or compounds you end with ReactantsProducts “yield”

4 Numbers Superscripts show the charge of an ion Subscripts show the # of atoms in a compound Coefficients show the # of molecules H +1 P -3 H 2 O C 6 H 12 O 6 2NaCl 5H 2 O

5 Fill in the Blanks Reactants Yields Product SubscriptCoefficient

6 Symbols

7 Symbols (cont.)

8

9 Signs of a Chemical Change A gas is produced A solid precipitate is formed

10 Signs of a Chemical Change Color Change Temperature Change

11 Types of Chemical Reactions Synthesis Decomposition Single Replacement Double Replacement Combustion

12 Synthesis A synthesis reaction starts with two or more reactants and ends up with one product.

13 Synthesis Magnesium + Oxygen  Magnesium oxide 2Mg + O 2  2MgO

14 Synthesis Sodium + Chlorine gas  Salt 2Na + Cl 2  2NaCl

15 Decomposition A decomposition reaction starts with one reactant and ends up with two or more products.

16 Decomposition Calcium carbonate decomposes to produce calcium oxide and carbon dioxide. CaCO 3  CaO + CO 2

17 Single Replacement A single-replacement reaction starts with two reactants and ends up with two products. An element takes the place of another element that’s in a compound.

18 Single Replacement Aluminum foil is placed in a solution of copper II chloride which produces copper metal and aluminum chloride solution. 2Al + 3CuCl 2  3Cu + 2AlCl 3

19 Double Replacement A double-replacement reaction starts with two reactants and ends up with two products. In this case both reactants and products are compounds. They simply change partners.

20 Double Replacement A solution of sodium chloride is mixed with a solution of lead nitrate resulting in the production of sodium nitrate and lead chloride. 2NaCl + Pb(NO 3 ) 2  2NaNO 3 + PbCl 2

21 Combustion A combustion reaction always involves a hydrocarbon and oxygen as reactants and ends up with carbon dioxide and water as products.

22 What type of reaction is this? 2H 2 O  2H 2 + O 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

23 What type of reaction is this? 4P + 5O 2  P 4 O 10 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

24 What type of reaction is this? 2MgO  2Mg + O 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

25 What type of reaction is this? BaCl 2 + H 2 S  BaS + 2HCl A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

26 What type of reaction is this? 2Al 2 O 3  4Al + 3O 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

27 What type of reaction is this? Cl 2 + 2NaBr  Br 2 + 2NaCl Synthesis Decomposition Single Replacement Double Replacement

28 What type of reaction is this? 3H 2 + N 2  2NH 3 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

29 What type of reaction is this? CaCl 2 + 2KBr  2KCl + CaBr 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

30 What type of reaction is this? H 2 O + MgO  Mg(OH) 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

31 What type of reaction is this? 2NH 4 CO 3  2NH 3 + H 2 O + CO 2 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

32 What type of reaction is this? Cu + AgNO 3  Ag + CuNO 3 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

33 What type of reaction is this? 2Al + 3CuCl 2  3Cu + 2AlCl 3 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

34 What type of reaction is this? C + 2H 2  CH 4 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

35 What type of reaction is this? 3NiO + 2Li 3 P  3Li 2 O + Ni 3 P 2 Synthesis Decomposition Single Replacement Double Replacement

36 What type of reaction is this? CuCl 2 + H 2 S  2HCl + CuS A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

37 What type of reaction is this? 2H 3 PO 4  3H 2 O + P 2 O 5 A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement

38 What type of reaction is this? 2Na + FeO  Fe + Na 2 O A)Synthesis B)Decomposition C)Single Replacement D)Double Replacement


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