SME
Grade 10 Science · Problem type
Properties of ionic, molecular and metallic substances
Use this for “Which observation shows that a solid is an ionic compound?”
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Which kind of substance behaves this way?
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Assumptions
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How a substance behaves comes from how its particles are held together.
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Conducting needs charges that can move: free electrons, or ions let loose by melting or dissolving.
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Related lessons
Ionic, covalent and metallic bonding
Main lesson
The formula of an ionic compound
Use this to find an ionic compound’s formula from the charges of its ions: Mg²⁺ with Cl⁻ is MgCl₂, Al³⁺ with O²⁻ is Al₂O₃.
Metallic bonding: a sea of electrons
Use this for metallic bonding: how many electrons a piece of aluminum shares among its ions.
Bond polarity from electronegativity
Use this to tell whether a bond is nonpolar, polar covalent or ionic from the electronegativity difference.
Ionic, covalent or metallic?
Use this for “What kind of bond holds magnesium oxide together?”