Catalyst – March 17th 2010

1. List 2 characteristics of combustion reactions.

2. What is the general equation for a synthesis reaction?

3. What do you think the products of the following decomposition reaction are:

CaO ? + ?

Today’s Agenda

Catalyst Homework Review Chemistry Prom 2009 Day 2! Practice and Work Time GEE PREP Exit Question

Today’s Objectives

SWBAT predict the products of single-replacement and double-replacement reactions.

SWBAT differentiate between single-replacement and double-replacement reactions.

Single and Double Replacement

Reactions

Drama on the Dance Flo!

Key Point #1: A SINGLE-REPLACEMENT REACTION is one in which a single element replaces a similar element in a compound

A + BX AX + B A couple is dancing, and someone

else cuts in

Single-Replacement in Action

Example: Zn + CuCl2

ZnClCl Cu +

A + BX AX + B

ClCl Zn Cu+

Single-Replacement Practice

1. Predict the products of the reaction between solid copper and silver (I) nitrate.

Write the reactants first.Then, write the products.

Ag + Cu(NO3)2

Cu + AgNO3 Must Kriss

Kross to get the correct formulas!

Reactivity in the mix!

Will a single-replacement reaction ALWAYS take place?

Will there ALWAYS be cut-in drama on the dance flo?

No, you have to check the reactivity series of metals and halogens

Reactivity in the mix!

A metal will NOT ALWAYS replace another metal in a compound

Reactivity is a substance’s ability to react with another substance

The most active metals are on the top of the list on page 288

More active metals will replace less active metals Example: Ag (s) + Cu(NO3)2 (aq) NO

RXN!

Metals near the top are most reactive and will displacing metals near the bottom.

Q: Which of these will react?

1. Fe + CuSO4 2. Ni + NaCl 3. Li + ZnCO3 4. Al + CuCl2

Cu + Fe2(SO4)3Yes, Fe is

above CuNR (no reaction)

No, Ni is below Na

Zn + Li2CO3Cu + AlCl3

Yes, Al is above Cu

KNaLiCaMgAlZnFeNiSnPbHCuHgAgAu

Yes, Li is above Zn

Reactivity Series

Reactivity of Halogens

The same goes for halogens More active halogens will replace less

active halogens List also on page 288 Q: Which of these will react?

F2 (g) + 2 NaBr (aq)

I2 (g) + 2 KCl (aq)

F

Cl

Br

I

Yes, F is above Br

2 NaF (aq) + Br2 (l)

NR (no reaction)

No, I is below Cl

Example Problem 10-2

Write down the following reactants. Then, predict the products of the reactions.

1. Fe (s) + CuSO4 (aq)

2. Br2 (l) + MgCl2 (aq)

3. Mg (s) + AlCl3 (aq)

KNaLiCaMgAlZnFeNiSnPbHCuHgAgAu

F

Cl

Br

I

Swing Fever!

Key Point #2: A DOUBLE-REPLACEMENT REACTION is one in which ions switch places. You must KRISS-KROSS to write ALL formulas!

AX + BY AY + BX Two couples are dancing and decide to

switch partners!

Double-Replacement in Action

Example: MgO + CaS

AX + BY AY + BX

SOMg Ca

+O S

Mg Ca+

Double-Replacement Practice

1. Predict the products of the reaction between silver (I) nitrate and lithium iodide.

Write the reactants first.Then, write the products.

LiNO3 + AgIAgNO3 + LiI Must Kriss

Kross to get the correct formulas!

Let’s think about the positive and the negative…cations and anions

AX + BY AY + BX

A and B are cations (positively charged)X and Y are anions (negatively charged)

You can see the anions have switched places andare now bonded to the other cations in the

reaction

PRACTICE!

Worksheet!

Exit Question

1. What are the 4 types of chemical reactions we have learned about so far at Chemistry Prom?

2. Will the following reaction occur? Why or why not?

Ni + AuBr3 NiBr2 + Au