7.2 Ionic Bonds and Ionic Compounds -...
Transcript of 7.2 Ionic Bonds and Ionic Compounds -...
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Ionic Bonds and Ionic Compounds
In many coastal countries that have warm, relatively dry climates, salt is produced by the evaporation of seawater. You will learn how cations and anions combine to form stable compounds such as sodium chloride.
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Ionic Bonds and Ionic Compounds
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Formation of Ionic Compounds
Formation of Ionic Compounds
What is the electrical charge of an ionic compound?
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Ionic Bonds and Ionic Compounds
> Formation of Ionic Compounds
Compounds composed of cations and anions are called ionic compounds.
Although they are composed of ions, ionic compounds are electrically neutral.
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Ionic Bonds and Ionic Compounds
> Formation of Ionic Compounds
Aluminum metal and the nonmetal bromine react to form an ionic solid, aluminum bromide.
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Ionic Bonds and Ionic Compounds
> Formation of Ionic Compounds
Ionic Bonds
The electrostatic forces that hold ions together in ionic compounds are called ionic bonds.
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Ionic Bonds and Ionic Compounds
> Formation of Ionic Compounds
Formula Units
• A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance.
• A formula unit is the lowest whole-number ratio of ions in an ionic compound.
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Ionic Bonds and Ionic Compounds
> Formation of Ionic Compounds
NaCl is the chemical formula for sodium chloride.
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Conceptual Problem 7.2
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Conceptual Problem 7.2
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Conceptual Problem 7.2
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Conceptual Problem 7.2
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Ionic Bonds and Ionic Compounds
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Properties of Ionic Compounds
Properties of Ionic Compounds
What are three properties of ionic compounds?
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Ionic Bonds and Ionic Compounds
> Properties of Ionic Compounds
Most ionic compounds are crystalline solids at room temperature.
Ionic compounds generally have high melting points.
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Ionic Bonds and Ionic Compounds
> Properties of Ionic Compounds
The coordination number of an ion is the number of ions of opposite charge that surround the ion in a crystal.
In NaCl, each ion has a coordination number of 6.
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Ionic Bonds and Ionic Compounds
> Properties of Ionic Compounds
Ionic compounds can conduct an electric current when melted or dissolved in water.
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