Types of Chemical Reactions POGIL Revised

Name:__________________ ____________________________________Date:________Hour:___________ Types of Chemical Reactions POGIL Do atoms rearrange in predictable patters during chemical reactions? Why? Recognizing patterns allows us to predict future behavior. Weather experts use patterns to predict dangerous storms so people can get their families to safety. Political analysts use patterns to predict election outcomes. Similarly, chemists classify chemical equations according to their patterns to help predict products of unknown but similar chemical reactions.

1. Match each description below to one of the reactions sets (A, B, C, or D) from Model 1. _______________ Ionic compounds dissolved in water switch partners. _______________ One compound breaks into elements or smaller compounds _______________ Two or more elements or compounds combine to form one product. _______________ Part of an ionic compound is removed and replaced by a new element. 2. Define the following terms as they are commonly used in the English language: a. Synthesis: b. Decomposition: c. Replacement:

3.The four sets of chemical reactions shown in Model 1 have the following general names. Discuss within your group which name belongs to which set of chemical reactions. Write the name in the appropriate place in Model 1. Single Replacement Reaction

Synthesis Reaction

Name:__________________ ____________________________________Date:________Hour:___________ Double Replacement Reaction

Decomposition Reaction

*Stop here and wait for further instructions from your teacher. Model 2: Analogy—Dancing with Reactants When you are thinking about the four different types of reactions, I’d like you to think about their similarity to dancing (yes, dancing). I’ll show you what I mean. The Dance… Adam and Barbara were both single. No one was talking about “Adam and Barbara” being together before the dance. They both go to the dance alone. However, they meet at just the perfect time when a song they both adore is playing. They end up holding hands the entire dance. After that fateful meeting, no one ever sees Adam without Barbara, they are forever referred to as “Adam and Barbara.” Key Questions 4.Represent the drama of Adam and Barbara as a chemical equation. Use A to represent Adam and B to represent Barbara. 5.If A and B represent elements, describe what is happening chemically.

6.How would you classify the reaction between A and B using the terms from question 3?

The Dance Continues… Later that same evening, Xavier and Yasmine, who have been “the couple” forever, have a heated quarrel and break up. 7.Represent the drama of Xavier and Yasmine as a chemical equation. Use X to represent Xavier and Y to represent Yasmine. 8.If X and Y represent elements, describe what is happening chemically.

9.How the using from 3?

10.What

would you classify reaction between X and Y the terms question

type of reaction is represented in the

Name:__________________ ____________________________________Date:________Hour:___________ picture below (the terms in question 3)? Write your own analogy for the reaction illustrated in the picture.

11.Write a chemical reaction for this scenario. The Dance Continues… In their blissful state, Adam and Barbara (AB) try to help Xavier and Yasmine (XY) reconcile their differences. After everyone agrees to stop quarreling, Adam asks Yasmine to dance. Xavier and Barbara decided that they will dance together, too. 12.Represent Adam and Barbara’s attempt to reconcile Xavier and Yasmine’s differences as a chemical equation. 13.Summarize the reaction.

14.What type of reaction does this scenario represent? (Based on the New Concepts words).

Name:__________________ ____________________________________Date:________Hour:___________ Model 3: Types of Reactions

15. As shown in Model 3, list the number of reactants and the number of products found in the synthesis reaction.

16. As shown in Model 3, list the number of reactants and the number of products found in a decomposition reaction. 17.Compare/contrast a single replacement reaction to a double replacement reaction.

18.Identify each of the reactions below as synthesis (S), decomposition (D), single replacement (SR), or double replacement (DR).

Name:__________________ ____________________________________Date:________Hour:___________ Model 3: Combustion Reactions

19. What are the products in all of the combustion reactions in Model 3? 20. What reactant is common in all of the combustion reactions in Model 3? 21. The “fuel” in most combustion reactions is a hydrocarbon. Using the examples in Model 3, write a description for the classification of substances known as hydrocarbons.

22. For each type of the reaction types in Model 1, explain why a combustion reaction CANNOT be classified as that type. Use complete sentences in each answer.

23.A student writes the following incorrect chemical equation for the synthesis of magnesium oxide. Mg + O2  MgO2 Another student writes the following incorrect synthesis reaction of magnesium oxide. Mg + O  MgO a. What is the correct formula for magnesium oxide? Hint: What type of compound is magnesium oxide?

b. What is the correct formula for elemental oxygen?

c. Describe the error made by the first student.

d. Write the correct balanced chemical equation for the synthesis of magnesium oxide.

Name:__________________ ____________________________________Date:________Hour:___________ 24.

A student writes the following incorrect chemical equation for a single replacement reaction between lithium bromide and fluorine. 2LiBr (aq) + F2 (g)  2Li (s) + 2FBr (g) a.

In a single replacement reaction, part of an ionic compound is removed and replaced by a new element. What element will fluorine replace in lithium bromide? Hint: What is the most common ionic form of fluorine?

b. What is wrong with the student’s prediction of the products in the above reaction?

c. Write the correct balanced equation for the single replacement reaction between lithium bromide and fluorine.

25.

A student writes the following incorrect chemical equation for a double replacement reaction between iron (III) bromide and sodium hydroxide solutions. FeBr3 (aq) + NaOH (aq)  FeOH (s) + NaBr3 (aq) a.

What is wrong with the chemical formula(s) of the product(s) predicted by this student?

b. Write the correct equation for the double replacement reaction between iron (III) bromide and sodium hydroxide.