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(2.3) TYPES OF CHEMICAL REACTIONS (p144-147). Word Equation A word equation - states what reacts and what is produced - uses words instead of formulas.

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Presentation on theme: "(2.3) TYPES OF CHEMICAL REACTIONS (p144-147). Word Equation A word equation - states what reacts and what is produced - uses words instead of formulas."— Presentation transcript:

1 (2.3) TYPES OF CHEMICAL REACTIONS (p144-147)

2 Word Equation A word equation - states what reacts and what is produced - uses words instead of formulas to describe a chemical reaction

3 Chemical Reaction Reactants - the starting materials in a reaction. Products - the new materials formed in a reaction.

4 Chemical Equation Describes a chemical reaction reactants  products Note: The symbol (  ) can be read as yields or forms or produces

5 Word Equation-Examples Ex 1: magnesium + oxygen  magnesium oxide what reacts what is produced (reactants) (products)

6 Word Equation-Examples Ex 2: zinc + hydrochloric acid  hydrogen + zinc chloride what reacts what is produced (reactants) (products)

7 Demo Time! 1) Magnesium reacts with oxygen 2) Copper sulfate decomposes 3) Zinc reacts with hydrochloric acid 4) Lead nitrate reacts with potassium iodide 5) Ethanol burns

8 CLASSWORK Worksheet 2.3 (A)-complete and hand in REMINDERS: Did you complete and hand in ? - Workbook p 46-52 - Worksheet “Periodic Table” Q # 1-11

9 Chemical Reactions – 4 Types 4 main types of chemical reactions Synthesis Decomposition Single displacement Double displacement Intro animation (see p145)

10 1. Synthesis Reactions Two or more reactants combine to form a new product. GENERAL CHEMICAL EQUATION (GCE)

11 Synthesis Reactions-Examples  sodium + oxygen  sodium oxide  2 H 2 + O 2  2 H 2 O

12 Synthesis Reaction TomKatie Tomcat

13 2. Decomposition Reactions A compound is broken down into elements or smaller compounds. GENERAL CHEMICAL EQUATION (GCE)

14 DDecomposition Reaction BenJenniferBennifer

15 Decomposition Reactions- Examples  sodium oxide  sodium + oxygen  2 H 2 O  2 H 2 + O 2

16 Is each reaction synthesis or decomposition? 1. Ag 2 CO 3  Ag 2 O + CO 2 2. P 4 + O 2  P 4 O 10 3. Fe + O 2  Fe 2 O 3 4. KClO 3  KCl + O 2 Decomposition Synthesis Decomposition Synthesis

17 Decomposition

18 3. Single Displacement Reactions One element replaces another element to form a new compound. GENERAL CHEMICAL EQUATION (GCE) Or

19 Brad & JenAngelina Jennifer Brangelina

20 Single Displacement- Examples calcium + hydrogen bromide  calcium bromide + hydrogen Br 2 + 2 KI +  2 KBr + I 2

21 4. Double Displacement Reactions In a double displacement reaction the metal ions in two compounds switch places…”partner swap” GENERAL CHEMICAL EQUATION (GCE)

22 Dawson & Joey Pacey & Jen Pacey & Joey Dawson & Jen

23 Double Displacement- Examples barium sulfide + potassium iodide  barium iodide + potassium sulfide AgNO 3 + KCl  AgCl + KNO 3

24 Is it single displacement (SD) or double displacement (DD)? 1. NaBr + Ca(OH) 2  CaBr 2 + NaOH 2. Pb + H 3 PO 4  H 2 + Pb 3 (PO 4 ) 2 3. Li 3 N + NH 4 NO 3  LiNO 3 + (NH 4 ) 3 N 4. CuSO 4 + Al  Al 2 (SO 4 ) 3 + Cu DD SD DD

25 Putting it all together: Which Type of Reactions are the following: a) H 2 O  H 2 + O 2 b) SiO 2 + HF  SiF 4 + H 2 O c) H 2 + O 2  H 2 O d) Cu + HCl  H 2 + CuCl 2 Single Displacement Double Displacement Synthesis Decomposition

26 Predict What Gets Made 1. Al + Cl 2  2. CuF 2 + K  3. MgO  4. CaS + FeN  Pick your answer from this box Mg Ca 3 N 2 F 2 KF 2 Cu N 2 AlCl 2 CaFe AlF 3 FeS O 2 SN

27 Chemical Reactions – 5 th Type Another reaction type is Combustion (also called burning) The burning of fossil fuels always needs oxygen and will yield predictable products. Complete combustion: lots of O 2 Fuel + oxygen  carbon dioxide + water (in general) C x H y + O 2  CO 2 + H 2 O CH 4 + 2 O 2  CO 2 + 2 H 2 O

28 5. Combustion Reactions The burning of fossil fuels always requires oxygen and will yield predictable products. Complete combustion: lots of O 2 Fuel + oxygen  carbon dioxide + water CxHy + O 2  CO 2 + H 2 O CH 4 + 2 O 2  CO 2 + 2 H 2 O

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30 Combustion Continued Incomplete combustion: occurs when there is not enough O 2 The products are different than with complete combustion. CxHy + O 2  C + CO + CO 2 + H 2 O

31 Chemical Reactions – 5 Types And now a video to summarize: Five Major Chemical Reactions

32 CLASSWORK WORKBOOK – complete and hand in p. 53-54

33 Recall: Chemical Reactions – 5 Types Types of chemical reactions: Synthesis Decomposition Single displacement Double displacement Combustion

34 Chemical Formulas The chemical formulas of most elements are written simply as the symbol in the periodic table Ex: magnesium, Mg sodium, Na  But there are some elements that contain more than one atom.  For a list, see Table 2.9 p147 or your workbook p55

35 Chemical Formulas Textbook p 147

36 Chemical Equation From the word equation you can now write a chemical equation: Ex: a) sodium chloride  sodium + chlorine NaCl  Na + Cl 2 b) hydrogen + oxygen  water H 2 + O 2  H 2 O

37 CLASSWORK -complete and hand in Worksheet 2.3 (B) Workbook – p. 57-59


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