Chemical Reactions Types of Chemical Reactions Essential Questions

Chemical Reactions Types of Chemical Reactions

Essential Questions • Describe the four types of chemical reactions. • How are chemical equations classified as one of the types? www. brainybetty. com 2

Definitions • Synthesis reaction – reaction in which two or more substances combine to make a new substance • Decomposition reaction – a compound breaks down to form two or more simpler substances • Single-displacement reaction – one element or radical takes the place of another element or radical www. brainybetty. com 3

Definitions, continued • Double-displacement reaction – ions from two compounds change places www. brainybetty. com 4

Types of Chemical Reactions can be in four main categories l Synthesis l Decomposition l Single replacement l Double replacement l Each will be illustrated with a dance model www. brainybetty. com 5

Synthesis Reactions • Two or more substances combine to form a new compound • Ex: Na + Cl Na. Cl • Dance example: Chandler asks Ashley to dance, they are now one couple dancing www. brainybetty. com 6

Synthesis Reactions + Ben Affleck www. brainybetty. com Jennifer Lopez 7

Synthesis Reactions = Bennifer www. brainybetty. com 8

Decomposition Reaction l reaction where a single compound breaks down into two simpler compounds l. Ex: H 2 CO 3 H 20 + CO 2 l. Dance example: John is dancing with Kayla, he leaves to get her a drink. They have gone from a dancing couple to two single people. www. brainybetty. com 9

Decomposition Reaction = Tom Cruise and Nicole Kidman www. brainybetty. com 10

Decomposition Reaction + Tom Cruise www. brainybetty. com Nicole Kidman 11

Single-Displacement Reaction • One element replaces another element that is part of a compound • Ex: Zn + 2 HCl Zn. Cl 2 + H 2 • Dance example: Danisha and Tyler are dancing. Zack cuts in, now Zack and Danisha are dancing and Tyler is alone. www. brainybetty. com 12

Single-Displacement Reaction + Brad Pitt and Jennifer Aniston www. brainybetty. com Angelina Jolie 13

Single-Displacement Reaction = + Jennifer Aniston www. brainybetty. com Brad Pitt and Angelina Jolie 14

Reactivity of Elements • More reactive elements displace less reactive elements in a singledisplacement reactions • Group 1 is the most reactive; Group 17 is the only non-metal group that is reactive www. brainybetty. com 15

Double-Displacement Reactions n Ions from two compounds exchange places n Ex: Na. Cl + Ag. F Na. F + Ag. Cl n Dance example: Jakob and Yadira are dancing. Gerald and Krystal are dancing. As they pass each other, they switch partners. Now Jakob and Krystal are dancing and Gerald and Yadira are dancing. www. brainybetty. com 16

Double-Displacement Reactions + Pauly D & Snooki www. brainybetty. com The Situation &Jwoww 17

Double-Displacement Reactions = + The Situation & Snooki www. brainybetty. com Jwoww & Pauly D 18