Synthesis ReactionsSynthesis Reactions

Synthesis Reactions:Synthesis Reactions:At the conclusion of our time together, At the conclusion of our time together,

you should be able to:you should be able to:

1.1. Recognize a synthesis chemical reactionRecognize a synthesis chemical reaction2.2. Balance this reaction typeBalance this reaction type

When Your Back is Up Against It….

Decomposition

Simple Reactions

Synthesis(Combination)

SingleReplacement

DoubleReplacement

Decomposition

Synthesis

SingleReplacement

DoubleReplacement

A B A B+

A BA B +

A BA B +C+ C

A BAB +C+ CD D

Decomposition

Synthesis

SingleReplacement

DoubleReplacement

A B A B+

A BA B +

A BA B +C+ C

A BAB +C+ CD D

What Do You Call Four Bullfighters What Do You Call Four Bullfighters In Quicksand?In Quicksand?

Quatro CincoQuatro Cinco

Synthesis reactionsSynthesis reactions• Synthesis reactionsSynthesis reactions occur when occur when twotwo

substances (generallysubstances (generally elementselements) combine ) combine and form a and form a compoundcompound. (Sometimes these . (Sometimes these are called combination or addition reactions.)are called combination or addition reactions.)

reactant + reactant reactant + reactant 1 product 1 product• Basically: Basically: A + B A + B AB AB

• Example: Example: 2H2H2 2 + O+ O2 2 2H 2H22OO

• Example:Example: MgMg + O+ O2 2 MgOMgO

2 Mg + O2 Mg + O22 2 MgO 2 MgO

Synthesis ReactionsSynthesis Reactions• Here is another example of a synthesis Here is another example of a synthesis

reactionreaction

Synthesis ReactionSynthesis Reaction

• Predict the products and balance the Predict the products and balance the following reaction:following reaction:

Fe + S Fe + S FeSFeS

+2+2

Na + ClNa + Cl2 2

NaClNaCl

2 Na + Cl2 Na + Cl22 2 NaCl 2 NaCl

Joining CompoundsJoining Compounds

• 6, 6, 1, 66, 6, 1, 6

• One main purpose:One main purpose:

• To make a more complex compound!!To make a more complex compound!!

Septic Tank Humor

Synthesis Reactions:Synthesis Reactions:Let’s see if you can:Let’s see if you can:

1.1. Recognize a synthesis chemical reactionRecognize a synthesis chemical reaction2.2. Balance this reaction typeBalance this reaction type

All You Really Need To Know All You Really Need To Know You Can Learn From Noah's Ark You Can Learn From Noah's Ark

9.9. Speed isn't always an Speed isn't always an advantage; the snails were advantage; the snails were on board with the cheetahs. on board with the cheetahs.

10.10. When you're stressed, float When you're stressed, float awhile. awhile.

PracticePractice

• Predict the products. Write and balance the Predict the products. Write and balance the following synthesis reaction equations.following synthesis reaction equations.

• #7: Potassium metal reacts with fluorine #7: Potassium metal reacts with fluorine gas gas

KK(s) (s) + F+ F2(g) 2(g) • #3: Iron (III) reacts with iodine#3: Iron (III) reacts with iodine

FeFe(s) (s) + I+ I2(g) 2(g) • #6: Lead (IV) metal reacts with oxygen gas#6: Lead (IV) metal reacts with oxygen gas

PbPb(s) (s) + O+ O2(g) 2(g)

KF

FeI3

PbO

2

2, 1, 2

2, 3, 2

I don’t feel so stupid now…

Synthesis Reactions:Synthesis Reactions:Let’s see if you can:Let’s see if you can:

1.1. Recognize a synthesis chemical reactionRecognize a synthesis chemical reaction2.2. Balance this reaction typeBalance this reaction type

Entrance QuizEntrance Quiz

• State the type, predict the products and State the type, predict the products and balance the following reactions:balance the following reactions:

Cesium reacts with bromine gas Cesium reacts with bromine gas

SynthesisSynthesis

Cs + BrCs + Br2 2

CsBrCsBr

2 Cs + Br2 Cs + Br22 2 CsBr 2 CsBr