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IONIC COMPOUNDS Chapter 5.8

IONIC COMPOUNDS

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IONIC COMPOUNDS. Chapter 5.8. IONIC COMPOUNDS. Recall: Metals form positive ions (+) and non-metals form negative ions (-). 1-. 1+. Cl. Na. IONIC COMPOUNDS. When ions like NaCl form, they make an ionic bond . - PowerPoint PPT Presentation

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Page 1: IONIC COMPOUNDS

IONIC COMPOUNDS

Chapter 5.8

Page 2: IONIC COMPOUNDS

IONIC COMPOUNDSRecall: Metals form positive ions (+)

and non-metals form negative ions (-).

Na

1+ Cl

1-

Page 3: IONIC COMPOUNDS

IONIC COMPOUNDS When ions like NaCl form, they make

an ionic bond. Ionic bond – the attraction between a

positive metal ion and a negative non-metal ion.

Na

1+ Cl

1-

Page 4: IONIC COMPOUNDS

Like most ionic compounds, NaCl can form a crystalline structure

Just like most things in nature, these

Na

1+ Cl

1-

NaCl

Page 5: IONIC COMPOUNDS

Ionic bonds Ionic compounds have certain

characteristics because of their ionic bonds: Most are crystalline solids at room

temperature. Ionic compounds generally have high

melting points. Can conduct an electric current when

dissolved in water (electricity can “jump” between the negative and positive charges).

Page 6: IONIC COMPOUNDS

Just like most things in nature, the charges in ionic compounds must balance out. Ex. Sodium ion is 1+, Chloride ion is 1-

so they balance out. What about calcium and chloride?

Na

1+ Cl

1-

NaCl

Page 7: IONIC COMPOUNDS

Calcium atom becomes Calcium ion with a charge of _____.

Chlorine atom becomes Chloride ion with a charge of _____.

So how will they form a compound?

One calcium ion will bond with two chloride ions so that the charges balance out.

2+

1-

Ca2+Cl -Cl - CaCl2

Page 8: IONIC COMPOUNDS

Recall – use subscripts to show how many of each atom are in a compound.

CaCl2 calcium chloride

Page 9: IONIC COMPOUNDS

Science 10 – Nov. 24th Draw Bohr diagrams for atoms and

stable ions for: Mg, S, Na, F

Page 10: IONIC COMPOUNDS
Page 11: IONIC COMPOUNDS

WRITING FORMULAS OF IONIC COMPOUNDS

EXAMPLE 1- What is the formula for the ionic compound of calcium and fluorine?

Step 1 – Write the symbols of the elements with the metal first and non-metal second

Ca FStep 2 – Write the ion charge of each

element Ca2+ F-1

Page 12: IONIC COMPOUNDS

Step 3 – Determine how many of each you need to have an overall charge of zero.

Ca+2 F-1 F-1

Step 4 - Write the formula using subscripts, after the element, to indicate how many you used.

Ca1F2 CaF2 ( 1 is not needed )

Page 13: IONIC COMPOUNDS

EXAMPLE 2 What is the formula for the ionic

compound of aluminum and sulfur? Steps:1) Al S2) Al+3 S-2

3) Al+3 Al+3 S-2 S-2 S-2

4) Al2S3

Page 14: IONIC COMPOUNDS

CRISS-CROSS RULE Al+3 S-2

Al2S3

Watch out for lowest terms: Mg+2 O-2

Mg2O2 MgO

Page 15: IONIC COMPOUNDS

WRITING NAMES OF IONIC COMPOUNDS

When naming an ionic compound we simply write the name of the metal first and non-metal second. We change the ending of the non-metal name so that it ends in “ide.”

Page 16: IONIC COMPOUNDS

EXAMPLES 1) NaCl – sodium Chloride 2) CaBr2 – calcium bromide 3) MgO – magnesium oxide

Page 17: IONIC COMPOUNDS
Page 18: IONIC COMPOUNDS

HOMEWORK Read pages 192-194 Questions page 195 #1a, 3,4,5,6

Page 19: IONIC COMPOUNDS

Science 10 – Nov. 15th Write the chemical formula and

chemical name for the compound formed by chlorine and calcium.