1.3 Structures

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75 Terms

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Delocalised electrons

an electron that is able to move freely and carry charge

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Positive metal ions are

Metal atoms that have lost their outer electrons

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Lattice

Regular arrangement of particles

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Giant structure

A huge 3D network of atoms or ions

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Electrostatic forces of attraction

Strong forces of attraction between oppositely charged particles

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Metallic bonding

A lattice of positive metal ions surrounded by delocalised outer electrons, held together by strong electrostatic forces of attraction

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Melting and boiling points of metallic substances

high as strong electrostatic forces between positive metal ions and negative delocalised electrons

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Reason for metals being malleable

Layers of metal ions can slide over each other

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Reason alloys are harder than pure metals

Different sized atoms disrupt the layers of ions, preventing layers from sliding

<p>Different sized atoms disrupt the layers of ions, preventing layers from sliding</p>
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Usefulness of pure metals

Too soft for most uses

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Reason metals conduct heat well

delocalised electrons can transfer heat energy quickly

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Reason metals conduct electricity well

delocalised electrons can carry electrical charge through the structure.

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24 carat gold

pure gold

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Gold used in jewellery is

Usually an alloy with silver, copper and zinc

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18 carat gold

An alloy containing 75% gold

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12 carat gold

An alloy containing 50% gold

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Giant structure

A three-dimensional network of atoms or ions

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Lattice

Regular arrangement of particles.

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Bonding in giant covalent structures

Covalent bonding

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Covalent bond

A shared pair of electrons

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States of giant covalent substances at room temperature

Solid

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Melting points of giant covalent substances

Very high

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Bonds broken when giant covalent structures are melted

Covalent bonds

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Examples of giant covalent structures

Diamond, graphite, silicon dioxide

<p>Diamond, graphite, silicon dioxide</p>
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Reason for giant covalent structure's high melting point

Many strong covalent bonds require lots of energy to break

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Solubility of giant covalent substances

Insoluble

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Formula of silicon dioxide

SiO2

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Uses of diamond

Cutting tools and jewellery

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Uses of graphite

Pencil leads, lubricants

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Number of bonds between atoms in graphite

3

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Properties of diamond

Translucent, Hard, High melting point, Does not conduct electricity

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Properties of graphite

Soft, Slippery, good conductor of heat and electricity

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Reason graphite is soft

Weak forces between layers which can slide over each other.

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Reason graphite conducts electricity

One spare electron is delocalised and can carry charge through the layers

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Molecule

Two or more atoms held together by covalent bonds

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State of molecular substances at room temperature

Liquids or gases

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Van der Waals forces

Weak forces of attraction between molecules

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Melting and boiling points of molecular substances

Low as Van der waals forces are weak.

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Trends in Van der Waals

The larger the molecule the stronger the Van der Waals

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Electrical conductivity of molecular substances

Low conductivity

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Reason for electrical conductivity of molecular substances

Molecules are neutral

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Covalent bonds

A shared pair of electrons

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Solubility of small molecules

Insoluble in water

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Soluble molecules

Hydrochloric acid, ammonia

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Reason some molecules are soluble

They react with water

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Giant ionic lattice

huge 3D regular structure held together by the electrostatic forces of attraction between positive and negative ions

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Melting and boiling points of ionic substances

high

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Reason for melting and boiling points of ionic substances

Strong ionic bonds and electrostatic forces require substantial energy to break

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Movement of ions in a solid

Ions vibrate around fixed positions

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Molten

Made liquid by heat

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Movement of ions when molten

Ions can move past each other

<p>Ions can move past each other</p>
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Movement of ions in solution

Ions break apart and move freely

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Conductivity of solid ionic compounds

don't conduct

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Reason for conductivity of solid ionic compounds

Ions are fixed in place

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Conductivity of molten/dissolved ionic compounds

good conductors

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Reason for conductivity of liquid/dissolved ionic compounds

Ions are free to move and carry charge

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Electrostatic force of attraction

attractive force between oppositely charged particles

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Number of bonds between atoms in diamond

4

<p>4</p>
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Allotrope

Different forms of the same element in the same state

<p>Different forms of the same element in the same state</p>
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Number of bonds between atoms in graphite

3

<p>3</p>
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Properties of graphite

Soft, Slippery, good conductor of heat and electricity

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Properties of graphene

Very strong and flexible, good thermal and electrical conductor, nearly transparent

<p>Very strong and flexible, good thermal and electrical conductor, nearly transparent</p>
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Reason graphene conduct electricity

One spare electron is delocalised and can carry charge through the layer

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Graphene

A single layer of graphite one atom thick.

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Uses of graphene

Electronics and solar cells

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Reason graphene is strong

Strong covalent bonds between atoms need lots of energy to break

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Carbon outer shell electrons

4

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Carbon maximum covalent bonds

4 - sharing all its outershell electrons

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Reason for metals high melting and boiling points

strong electrostatic forces between positive metal ions and negative delocalised electrons

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Reason metals being malleable

layers of ions can slide over each other

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Reason alloys are harder than pure metals

Different sized atoms disrupt the layers of ions, preventing layers from sliding

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Usefulness of pure metals

Too soft for most uses

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Reason metals conduct heat well

Delocalised electrons can transfer heat energy quickly.

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Reason metals conduct electricity well

Delocalised electrons can carry electrical charge through the structure.