Structure And Bonding Flashcards

1
Q

What’s ionic bonding

A

Metal and non metal

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2
Q

What’s room temp

A

25 C

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3
Q

What’s covalent bonding

A

Non metal and non metal
Pair of electrons shared
Strong bonds

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4
Q

What’s metal made of

A

Positive atoms or ions around sea of delocalised electrons

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5
Q

Why can metal conduct electricity

A

Electrons are free to move

giant structure close packed
made up of atoms
with delocalized and free electrons
so electrons can move / flow through the metal

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6
Q

Difference of alloy and pure metal

A

Alloy- has electrons and ions but has another metal or non metal

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7
Q

Describe a pure metal

A

Has layers
= can slide across each other
= soft

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8
Q

Describe an alloy

A

Has distorted layers
= can’t slide
= hard

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9
Q

Describe ionic compounds structure

A

Giant ionic lattice
high melting point
= high boiling point
= only conduct when molten or dissolved
( ions need to be free to move )

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10
Q

Describe simple covalent compounds structure eg water, oxygen

A

Covalent bonding
= low melting points
= low boiling points
= don’t conduct electricity

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11
Q

Describe giant covalent compounds structure eg graphite, diamond

A

Giant covalent structure
= high melting points
= high boiling points
= don’t conduct electricity
= don’t dissolve

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12
Q

Describe diamond structure

A

Made of carbon
= create giant covalent lattice
Each carbon makes 4 bonds
- hard

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13
Q

Describe graphite structure

A

Made of carbon
= giant covalent
Each carbon bonds 3 times
- soft
- conducts electricity

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14
Q

Compare graphite and diamond

A
  • both made of pure carbon
  • graphite is made of 3 bonds
  • diamond is made of 4 bonds
  • graphite is soft
  • diamond is hard
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15
Q

Compare carbon nanotubes and buckminster fullerene

A
  • Both made of pure carbon
  • Both hard
  • Both have 3 carbon bonds
  • buck used for lubricant
  • both used for drug delivery
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16
Q

Describe nanotechnology

A

Very small
= increasing surface area
= different properties
= used for medicine drug delivery

17
Q

Why can metals bend

A

Made of layers
= atoms can slide over each other

18
Q

Why is graphite soft

A

Contains layers that’s slide over each other
= between layers there are only weak forces

19
Q

Why is diamond hard

A

Each atoms forms 4 covalent bonds
= covalent bonds are very strong

20
Q

Why does graphite conduct electricity

A

Has delocalised electrons which move through whole structure and carry the charge

21
Q

Why can sodium chloride solution conduct electricity

A

there are ions in sodium chloride
which can move or carry the current / charge

22
Q

Disadvantage of copper

A

copper metal is in demand
copper is expensive

23
Q

Why is an alloy harder than pure metal

A

Atoms have different sizes
Have distorted layers
= harder for layers to slide
= elements can’t move through structure

24
Q

Copper can be extracted from solutions of copper salts by adding iron

A

Iron more reactive
= copper is displaced

25
Q

How can you tell that copper is a transition metal and aluminium is not a transition metal from the position of each metal in the periodic table?

A

copper is in the central block of the periodic table
whereas aluminium is in Group 3 of the periodic table

26
Q

Describe the structure and bonding in metals

A

Giant structure of atoms/ ions with selects listed electrons

27
Q

Reasons for low boiling point

A
  • made of small molecules
    = weak intermolecular forces
    = little energy required to overcome intermolecular bonds
28
Q

Describe alpha particle scattering experiment

A
  • hammered gold into foil and fired tiny alpha particles at foil
  • particles either went through atom or bounced off
  • particles that went through proved atom mainly made of empty space not electrons
  • some deflected meant centre must be positive
29
Q

Why does boiling point increase

A

Relative mass increases
Molecules become larger
= stronger intermolecular forces
= more energy required to overcome intermolecular forces

30
Q

Describe reactivity of halogens

A

As you go down become further from nucleus
= nucleus has less attraction to outer shells
= electron gained less easily

31
Q

Adv of using burette

A

Can measure variable volumes
Can add solution drop by drop

32
Q

Adv of using a burette

A

Can add solution drop by drop
Can measure variable volumes

33
Q

Reason for high boiling point

A

giant structure
(with) strong (electrostatic) forces of attraction between (oppositely charged) ions
(so) large amounts of energy are needed to break the bonds / forces

34
Q

Describe a fullerene

A

Tubular or hollow spherical molecules held together by covalent bonds
3 covalent bonds per atom
= 1 spare electron per carbon atom
= electrons can flow through structure
= can conduct electricity