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Let’s get started!!. Goals In this tutorial, you will learn…  How to recognize 3 of the 5 types of reactions  Predict the products of reactions when.

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Presentation on theme: "Let’s get started!!. Goals In this tutorial, you will learn…  How to recognize 3 of the 5 types of reactions  Predict the products of reactions when."— Presentation transcript:

1 Let’s get started!!

2 Goals In this tutorial, you will learn…  How to recognize 3 of the 5 types of reactions  Predict the products of reactions when only given the reactants

3 What are the 5 types of reactions? SynthesisDecompositionCombustion Single replacement Double replacement

4 Which 3 will be we learning about?? Synthesis Decomposition Combustion

5 SYNTHESIS

6 Synthesis  Two or more reactants combine to form… A + B  AB

7 Synthesis Continued Mg + O 2  MgO Two reactants form one product BUT WAIT!! Don’t forget about everything you have already learned! Is your equation balanced?? 2 2

8 Before we keep going… lets learn a few things about predicting products Predicting products

9  Here are a few important things to remember when predicting products:  The compounds form must be neutral ionic compounds (which means you’ll be paying attention to their charges)  You do NOT carry subscripts from the reactants to the products.  You always balance your equation LAST

10 Let’s go back to that synthesis example  Remember the reaction: Mg + O 2  Helpful hint for later…why is oxygen O 2 and not just O? Click to find out why

11 Why O 2 ??  What are the other diatomic elements? (hint: remember the heavenly 7! Oxygen is a diatomic molecule, which means when oxygen is by itself it must be O 2. Remember that this DOES NOT mean that oxygen is O 2 in compounds, only by itself! Go back

12 Now to predict the products…  Remember A + B  AB so Mg + O 2 will make a compound with magnesium and oxygen. What does a compound with magnesium and oxygen look like?? Mg + O 2 

13 A compound with magnesium and oxygen… Magnesium is a metal, oxygen is a nonmetal so we must be forming an IONIC compound. What’s the charge of Mg? Mg 2+ What’s the charge of O? O 2-

14 So what’s the compound? Mg 2+ O 2- Pick… MgO 2 Mg 2 O 2 MgO

15 Nope! (-2) DOES NOT EQUAL ZERO MgO 2 Try again!

16 Nope! 2(+2) + 2(-2) = 0 But remember ionic compounds need to be in the simplest form Mg 2 O 2 Try again!

17 Yes! Very good!  MgO is a neutral, correct ionic compound so our formula is Mg + O 2  MgO Finally, balance the equation to satisfy the law of conservation of mass… 2Mg + O 2  2MgO

18 So remember…  When predicting products:  Make correct ionic compounds  THEN balance Let’s move on to the rest of the reaction types…

19 Decomposition

20 forms two or more products A + B AB 

21 Decomposition Continued The electrolysis of water is when water decomposes into hydrogen and oxygen gas as shown below: 2H 2 O  2H 2 + O 2

22 Predicting products and decomposition  Lets use that same reaction. What if we were not already given the products, how would we predict them? H 2 O  ?? Water is made of hydrogen and oxygen, so will my products just be H and O?

23 No!  Remember, H and O are both diatomic elements. H 2 O  H 2 + O 2 But wait….something is still missing….

24 Balance! DDon’t forget to balance your equation after you make your products! Your final answer should look like this: 2H 2 O  2H 2 + O 2

25 You try one…  What is the correct reaction for the decomposition of sodium chloride, NaCl? NaCl  Na + Cl 2NaCl  2Na + Cl 2 2NaCl  Na 2 + Cl 2

26 Nope!  Don’t forget that chlorine is a diatomic element, so it must be Cl 2 NaCl  Na + Cl Try again!

27 Nope!  Although this reaction is correctly balanced, sodium is NOT a diatomic element 2NaCl  Na 2 + Cl 2 Try again!

28 Yes! Very good!  This is a correct reaction for the decomposition of sodium chloride. 2NaCl  2Na + Cl 2 Ready for the last type of reaction?

29 Combustion

30  Combustion is the burning of hydrocarbons. Hydrocarbon?? What’s that?? Click to find out!  When a hydrocarbon reacts with oxygen (O 2 ), the products are ALWAYS….. Yes, ALWAYS… Carbon dioxide and water CO 2 + H 2 O

31 Hydrocarbons AA hydrocarbon is an organic molecule made up of hydrogen and carbon. Remember when we learned about these when we talked about organic chemistry?? CH 4 C 6 H 10 C 20 H 42

32 Combustion Cont…  Since the products of a combustion reaction are always CO 2 and H 2 O, the hardest part about combustion reactions is balancing them CH 4 + O 2  CO 2 + H 2 O Balance this equation…

33 Combustion Cont. BBe aware… this reaction was pretty easy to balance, some of the combustion reactions get pretty complicated! Like this one… CH 4 + O 2  CO 2 + 2H 2 O 4C 3 H O 2  12CO H 2 O

34 Ready for your quiz?? Yes! Not quite, review the types of reactions with me…

35 Review  Synthesis reactions: two or more reactants combine to form ONE product A + B  AB  Decomposition reactions: ONE reactant breaks down into two or more products AB  A + B  Combustion reactions: a hydrocarbon reacts with oxygen to produce carbon dioxide and water. Hydrocarbon + O 2  CO 2 + H 2 O Ok, now I’m ready for the quiz!

36 Quiz Question 1/5  Which of the following is a decomposition reaction? 2Fe + O 2  2FeO Na + AgCl  Ag + NaCl Na 2 S  2Na + S

37 Nope!  This is two reactants forming ONE product which is an example of a synthesis reaction 2Fe + O 2  2FeO Try again!

38 Nope!  This reaction does not just form one product. This reaction is an example of a single replacement reaction which we will learn about later. Na + AgCl  Ag + NaCl Try again!

39 Yes! Very good!  This reaction is ONE reactant breaking down into two or more products, which is an example of a decomposition reaction. Na 2 S  2Na + S Next question! Back to the question!

40 Quiz Question 2/5  How can you recognize a combustion reaction? A combustion reaction is the only reaction always has at least two reactants and two products. One of the reactants is always oxygen gas. A combustion reaction always has a hydrocarbon reacting with oxygen to produce carbon dioxide and water. A combustion reaction always has a hydrocarbon reacting with nitrogen, which is a very explosive reaction.

41 Nope!  We will learn about other reactions that can have more than one product and more than one reactant. This is NOT the way to identify a combustion reaction. Try again! A combustion reaction is the only reaction always has at least two reactants and two products. One of the reactants is always oxygen gas.

42 Nope!  Although combustion reactions are typically explosive, it is not because they react with nitrogen. Try again! A combustion reaction always has a hydrocarbon reacting with nitrogen, which is a very explosive reaction.

43 Yes! Very good!  This is how we identify a combustion reaction Next question! A combustion reaction always has a hydrocarbon reacting with oxygen to produce carbon dioxide and water. Back to the question!

44 Quiz Question 3/5  Pick correct bubble that finishes the reaction below. K + Cl 2  ?? 2K + Cl 2  2KCl K + Cl 2  KCl 2 K + Cl 2  KCl

45 Nope!  Remember to not carry subscripts over to your products. K has a +1 charge and Cl has a -1 charge so the product of KCl 2 is not neutral and cannot be correct. Try again! K + Cl 2  KCl 2

46 Almost! But not quite…  Although this product is correct, the equation is not balanced! Try again! K + Cl 2  KCl

47 Yes! Very good!  The products are correct and the reaction is balanced! Great job! Next question! 2K + Cl 2  2KCl Back to the question!

48 Quiz Question 4/5  Pick correct rectangle that finishes the reaction below. C 2 H 8 + O 2  ?? C 2 H 8 + O 2  CO 2 + H 2 O C 2 H 8 + O 2  C 2 H 8 O 2 C 2 H 8 + 4O 2  2CO 2 + 4H 2 O

49 Almost, but not quite…  Great job predicting the products, but…. don’t forget to balance!! Try again! C 2 H 8 + O 2  CO 2 + H 2 O

50 Nope!  Remember that combustion reactions always have carbon dioxide and water as products Try again! C 2 H 8 + O 2  C 2 H 8 O 2

51 Yes! Very good!  Products are correct and the equation is correctly balanced. Great job! Back to the question! Next question! C 2 H 8 + 4O 2  2CO 2 + 4H 2 O

52 Quiz Question 5/5  Pick correct rectangle that finishes the reaction below. Al + N 2  ?? Al + N 2  AlN 2 3Al + N 2  Al 3 N 2 2Al + N 2  2AlN

53 Nope!  Remember we do not carry over subscripts. Aluminum has a +3 charge and nitrogen has a -3 charge so a formula of AlN 2 is not a neutral compound Try again! Al + N 2  AlN 2

54 Nope!  Although this equation is balanced, since aluminum has a +3 charge and nitrogen has a -3 charge, this is not a neutral compound Try again! 3Al + N 2  Al 3 N 2

55 Yes! Very good!  A correct neutral compound for the product and a balanced equation. Great! Finish! Back to the question! 2Al + N 2  2AlN

56 You have finished the chemical reactions tutorial Congratulations! Go back to the start


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