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OCR 21st Century C3
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Cards (169)
Where are metals located on the periodic table?
To the left
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What are the three types of bonding?
Ionic
,
covalent
, and metallic
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Why do atoms bond?
To gain a full
outer shell
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What is ionic bonding?
Transfer of
electrons
between
metals
and
non-metals
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What is covalent bonding?
Sharing of
electrons
between two
non-metals
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What is metallic bonding?
Electrostatic
force between positive
ions
and electrons
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How can you determine if a compound is ionic or covalent?
By identifying the
types of atoms
bonded
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What type of bonding is present in carbon dioxide?
Covalent bonding
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What type of bonding is present in sodium chloride?
Ionic bonding
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What is the dot and cross diagram used for?
To illustrate
ionic bonding
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What happens to aluminum in ionic bonding?
It loses three
electrons
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What charge does aluminum have after losing electrons?
Three
plus charge
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What is the charge of fluorine after gaining an electron?
One
minus charge
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What are the properties of ionic compounds?
Brittle
, high
melting points
, good
insulators
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Why do ionic compounds conduct electricity in liquid form?
Because
ions
are free to move
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What is a giant ionic lattice?
A structure formed by strong
ionic bonds
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How does the charge of an ion affect its melting point?
Greater charge leads to
higher
melting point
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What is the formula for calcium oxide?
CaO
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How do you write the formula for sodium oxide?
Na2O
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What is the formula for magnesium nitride?
Mg3N2
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What is the charge of ammonium ion?
NH4
plus
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What is the formula for magnesium hydroxide?
Mg(OH)2
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What is covalent bonding between non-metals?
Sharing of
electron pairs
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What are simple molecular compounds?
Compounds with
weak intermolecular forces
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What is the difference between ionic and covalent compounds?
Ionic
compounds are
hard
,
covalent
are
soft
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What is the structure of diamond?
Hard, rigid structure with
strong bonds
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Why is graphite a good conductor of electricity?
Due to
delocalized electrons
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What is the structure of graphite?
Layered structure with
weak forces
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What are nanoparticles?
Particles sized 1-200
nanometers
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How do you convert nanometers to meters?
Divide by
1
0
9
10^9
1
0
9
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What is the formula for converting 10 nanometers to meters?
10
÷
1
0
9
=
10 \div 10^9 =
10
÷
1
0
9
=
1
0
−
8
m
10^{-8} \text{ m}
1
0
−
8
m
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What is the significance of alloys?
They improve
strength
and resistance to
corrosion
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What is the structure of metals?
Regular arrangement of
fixed
positive
ions
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Why are metals malleable?
They can slide past
each other
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Why are metals good conductors of electricity?
Due to
mobile delocalized electrons
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What is the difference between pure metals and alloys?
Alloys have
distorted
structures
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What is the role of delocalized electrons in metallic bonding?
They allow
conductivity
and
malleability
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What is the significance of the size of nanoparticles?
They have
unique
properties due to size
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What is the use of graphene?
Used in flexible
electronic
displays
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What is fullerene used for?
Drug delivery
and
cancer treatment
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See all 169 cards
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