53K - views

Chapter 2: Molecules, Ions, and Compounds

MACROSCOPIC SCALE. Elements combine to make compounds.. ATOMIC SCALE. Atoms combine to make molecules, or extended structures.. What we’ll cover…. Compound Formulas. Ions. Monatomic. Polyatomic. Ionic Compounds.

Download Presentation

Chapter 2: Molecules, Ions, and Compounds




Download Presentation - The PPT/PDF document "Chapter 2: Molecules, Ions, and Compound..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.



Presentation on theme: "Chapter 2: Molecules, Ions, and Compounds"— Presentation transcript:

Slide1

Chapter 2: Molecules, Ions, and Compounds

MACROSCOPIC SCALE

Elements combine to make compounds.

ATOMIC SCALE

Atoms combine to make molecules, or extended structures.Slide2

What we’ll cover…

Compound Formulas

Ions

Monatomic

Polyatomic

Ionic Compounds

Molecular Compounds

Other types of extended StructuresSlide3

Compound Formulas

Examples:

NaCl

CH

3

OH

(NH

4

)

2

SO

4Slide4

How many O atoms are in Mg

3

(PO

4

)

2

?

2

4

6

8Slide5

How many total atoms are in Mg

3

(PO

4

)

2

?

3

10

11

13Slide6

Three Types of Compounds

Molecular Covalent Extended Covalent

Ionic

AlloysSlide7

Can you predict this?

Ionic Compounds form from: Molecular Compounds form from:Slide8

Types of FormulasSlide9

IONS

Cations

Formed by losing electrons.

Have a positive charge.

Formed mainly from metals.Slide10

IONS

Cations

Formed by losing electrons.

Have a positive charge.

Formed mainly from metals.

Anions

Formed by gaining electrons.

Have a negative charge.

Formed mainly from nonmetals.Slide11

Monatomic Ions- Formed from single atomsSlide12

Books closed: What is the charge on a Mg ion?

+1

+2

+3

-1

-2

-3Slide13

Naming IONS

Cations

Name of element + “ion”

Na

+

= sodium ion

Mg

2+

= magnesium ionSlide14

Types of FormulasSlide15

IONS

Cations

Formed by losing electrons.

Have a positive charge.

Formed mainly from metals.Slide16

IONS

Cations

Formed by losing electrons.

Have a positive charge.

Formed mainly from metals.

Anions

Formed by gaining electrons.

Have a negative charge.

Formed mainly from nonmetals.Slide17

Monatomic Ions- Formed from single atomsSlide18

Books closed: What is the charge on a Mg ion?

+1

+2

+3

-1

-2

-3Slide19

Naming IONS

Cations

Name of element + “ion”

Na

+

= sodium ion

Mg

2+

= magnesium ionSlide20

Naming IONS

Cations

Name of element + “ion”

Na

+

= sodium ion

Mg

2+

= magnesium ion

Anions

Name of element with –ide ending + “ion”

Cl

-

= chloride ion

O

2-

= oxide ionSlide21

Polyatomic Ions you need to knowSlide22

Ionic Compound Formulas

Total cation charge = Total anion charge

Ex: Na

+

and Cl

-

make ________

Slide23

Ionic Compound Formulas

Total cation charge = Total anion charge

Ex: Na

+

and Cl

-

make NaCl

Mg

2+

and Cl

-

make ________ Slide24

Ionic Compound Formulas

Total cation charge = Total anion charge

Ex: Na

+

and Cl

-

make NaCl

Mg

2+

and Cl

-

make MgCl

2

NH

4+ and SO42- make _________Slide25

What is the formula of the compound formed between Fe

3+

and Cl

-

?

FeCl

FeCl

3

Fe

3

ClSlide26

What is the formula of the compound formed between Fe

3+

and SO

4

2-

?

FeSO4

Fe(SO

4

)

2

Fe

2

(SO

4

)3

Fe3(SO4)2Slide27

Naming Ionic Compounds

Name = cation name + anion name

Ex:

NaCl =

NH

4

Br =Slide28

Molecular Compounds

Nonmetal + nonmetal gives molecular compound

Ex: C + O

S + O

C + H

Slide29

Aside on gas prices…

Crude oil

Propane

Butane

Jet Fuel

Gasoline

Diesel/Heating

Longer molecules(asphalt/tar)

Slide30

Predicting Molecular Compound FormulasSlide31

Naming Molecular Compounds

Binary Compounds

form between 2 elementsSlide32

Naming Molecular Compounds

Binary Compounds

form with 2 elements

Element with highest group # named last, like it’s an anion.Slide33

Naming Molecular Compounds

Binary Compounds

form with 2 elements

Element with highest group # named last, like it’s an anion.

Use prefixes to indicate numbers:

2 = di

3 = tri

4 = tetra

5 = pentaSlide34

Network Solids

Held together like a molecule

Large and extended