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13 Cards in this Set
- Front
- Back
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Definition of ionic bonding |
the electrostatic force between the positively charged ions and the negatively charged ions |
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Why arecompounds formed |
so that the elements form full outer shell of electrons to form substances that are stable enough to exist and are in most cases harmless |
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explain why different ionic compounds have different melting/boiling points (e.g NaCl and MgO) |
Mg+2 has a higher charge than Na+ O+2 has a higher charge than Cl- Mg +2 forms a stronger electrostatic force of attraction with 0-2 than Na+ and Cl- So more energy is needed to overcome the forces of attraction so MgO higher mp |
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explain polar molecule water |
oxygen is more electronegative than hydrogen so it attracts the negative electrons |
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what does δ- mean |
Atom with partial negative charge |
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what does δ+ mean |
atom with partial positive charge |
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Δ- >>>> + (vise versa) |
Ion-dipol interaction - partial negative atom forms electrostatic force of attraction with the cation (vice versa) |
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definition of an ion |
an atom or a group of atoms that carries an electrical charge either positive or negative |
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why do ionic compounds have high melting/boiling points |
1. They have a large number of positive and negative electrons 2. there are strong electrostatic forces between the anions and the cations 3. Therefore a large amount of energy is needed to overcome the large number of electrostatic forces therefore high melting point |
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why are some substances not soluble in water |
because they have strong electrostatic forces between ions that the water can’t separate |
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Why is energy not conducted in solids |
the ions are in fixed position so they don’t move and flow to carry charges |
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why do things conduct electricity when molten |
because the ions can move and flow to carry charges |
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why are ionic comp dissolved in water good conductors of electricity |
the ions form bonds with H20 so the ions are mobile to move and flow and carry charges |
