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chemistry EOY 👸 > Atomic Structure And Bonding > Flashcards

Atomic Structure And Bonding Flashcards

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1
Q

Which subatomic particles are located in the nucleus

A

Protons, neutrons

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2
Q

Which subatomic particle are in the shells

A

Electrons

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3
Q

What is an element

A

A substance that is made of only one sort of atom

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4
Q

How many elements are there

A

118

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5
Q

What does atomic mass show

A

The total number of protons and neutrons in its nucleus and is represented by symbol A as it is on top

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6
Q

What does atomic number show

A

Number of protons and electrons the symbol for this number is Z as it is at the bottom

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7
Q

What does period number show

A

(Goes across ) Number of shells

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8
Q

What do groups show on the periodic table

A

(Vertical columns) same number of valence electrons (ones in the outer shell)

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9
Q

Group one

A

Alkali metals

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10
Q

Group 2

A

Alkaline earth metals

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11
Q

Group 7

A

Halogens

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12
Q

Group 0

A

Noble gasses

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13
Q

What is a compound

A

A pure substance made up of 2 or more elements chemically combined which cannot be separated by physical means

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14
Q

What is a mixture

A

Consists of 2 or more different substances not chemically joined together

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15
Q

Ionic bonding

A

Ionic bonding is the electrostatic attraction between positively charged ions and negatively charged ions formed when atoms transfer electrons from one to another.

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16
Q

Covalent bonding

A

A covalent bond is between non metals it is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

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17
Q

Metallic bonding

A

The metallic bond is the force of attraction between these free-moving (delocalised) electrons and positive metal ions

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18
Q

What is an ion

A

Electrically charged particle formed when an atom or molecule gains or loses an electron (s)

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19
Q

What do chemical equations show

A

The reactants ( those on the left side of the arrow the substance that takes part in and undergoes change during a reaction) and the products (the substances produced at the end of a reaction)

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20
Q

What does the arrow show in chemical equations

A

The conversion of reactants into products

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21
Q

What is written above the arrow

A

Reaction conditions or the name of a catalyst ( a substance added to make a reaction go faster)

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22
Q

What is a symbol equation

A

A symbol equation uses formulae of the reactants and products to show what happens in a chemical reaction and must be balanced to give the correct ratio of reactants and products

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23
Q

Why must equations be balanced

A

Atoms cannot be created or destroyed so if they exist in the reactants then they must be in the products

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24
Q

How are new substances made

A

During chemical reactions however the same atoms are always present before and after the reaction they have just joined up in different ways

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25
Q

What is the law of conservation of mass

A

no matter is lost or gained during a chemical reaction, mass is always conserved, therefore the total mass of the reactants is equal to the total mass of the products, which is why all chemical equations must be balanced.

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26
Q

What do all measures of separating mixtures rely on

A

There being a difference in a physical property such as the boiling point or solubility between the substances being separated

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27
Q

Charge and relative mass of a proton

A

Charge +1 mass 1

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28
Q

Charge and relative mass of a neutron

A

Charge 0 relative mass 1

29
Q

What is the charge and relative mass of an electron

A

Charge -1 relative mass 0

30
Q

What is the relative charge of an atom

A

Neutral as even though they contain charged subatomic particles the charges cancel each other out

31
Q

How to remember which is mass and which is atomic number

A

Think MASS = MASSIVE as mass number is the bigger of the 2 numbers so the smaller one must be the atomic number

32
Q

How to calculate number of neutrons

A

Mass number - atomic number

33
Q

What is the outermost shell of an electron called

A

Valence shell

34
Q

What are negative and positive ions also called

A

Negative - anions
positive - cations

35
Q

What charge are metal ions

A

They loose electrons and become positive

36
Q

What charge are non metal ion s

A

They gain an electrons and become negative

37
Q

What is the structure of ionic compounds

A

It has a giant lattice structure with strong electrostatic forces of attraction as a result of this ionic compounds have high melting and boiling points

38
Q

How are molecules formed

A

When 2 or more atoms are covalently joined together

39
Q

What is the properties of metals

A

Metals are shiny, conductive materials with malleable and ductile properties, they conduct heat and electricity due to the sea of delocalised electrons which can carry charge through the metal lattice structure

40
Q

Describe the arrangement of solids

A

1)Strong forces of attraction between particles, particles are packed very closely together in a fixed and regular pattern
2)Atoms vibrate in a fixed position but can’t change position or move
3)Solids have a fixed volume and shape, and a relatively high density
4) Solid particles have only a small amount of energy

41
Q

Define melting, boiling, freezing, evaporation condensation, sublimation and deposition

A

Melting- solid to liquid
Boiling- liquid to gas
Freezing- liquid to solid
Evaporation- liquid to a gas
Condensation- gas to liquid
Sublimation- solid to gas
Deposition- gas to solid

42
Q

Describe the properties of liquids

A

1) Liquids have a fixed volume but take the shape of their container because their particles can flow past each other
2) they are incompressible due to minimal space between particles
3) liquid particles are closely packed together and can move past eachother

43
Q

Describe the properties of gases

A

1) Gases are compressible due to the large spaces between particles allowing them to be pushed closer together.
2)They expand to fill any container as their particles move freely.
3)Gasses have low density because the particles are widely spaced
4)The particles move rapidly and randomly in all directions

44
Q

Aqueous definition

A

A substance which is dissolved in water in other words a solution

45
Q

State symbol of solid liquid gas an aqueous

A

s l g and aq

46
Q

What is a molecule

A

A particle that consists of two or more atoms chemically bonded together

47
Q

What is an alloy

A

a mixture of two or more elements at least one of which is a metal

48
Q

What is a simple covalent structure

A

small molecules that are formed by covalent bonds between non-metal atoms.
These molecules are held together by strong covalent bonds internally, while the forces between the molecules (intermolecular forces) are weak, resulting in low melting and boiling points.

49
Q

What are the properties of giant covalent substances

A

High melting and boiling points: Due to the strong covalent bonds between atoms throughout the structure, it requires a significant amount of energy to break these bonds, resulting in high melting and boiling points.
Hard and brittle: These structures are generally hard and brittle because the strong covalent bonds make it difficult to deform the structure. When a force is applied, the structure tends to fracture rather than bend or deform.
Poor electrical conductivity - Most giant covalent structures are poor conductors of electricity because they do not have free-moving electrons. However, some exceptions exist, like graphite, which has a layered structure with delocalized electrons that can conduct electricity along the layers.
Insoluble in water-due to their strong covalent bonds

50
Q

Examples of giant covalent structures

A

Diamond graphite and silicon dioxide

51
Q

describe the shape and structure of diamond

A

Diamond has a tetrahedral structure where each carbon atom forms 4 strong covalent bonds with other carbon atoms creating a 3D lasttice

52
Q

Describe the shape and structure of graphite

A

Graphite has a layered structure where each carbon atom forms 3 covalent bonds with other carbon atoms in hexagonal layers with one free electron per atom allowing for weak forces between atoms

53
Q

Describe the hardness conductivity and solubility for diamond

A

Hardness- the strong covalent bonds throughout the lattice make diamond extremely hard
Conductivity - no free electrons to carry current meaning it doesn’t conduct electricity
Solubility - insoluble because of the strong covalent bonds

54
Q

Describe the hardness conductivity and solubility of graphite

A

Hardness- the week intermolecular forces between layers allowing them to slide over eachother make graphite soft
Conductivity - the delocalised electrons between layers allow graphite to conduct electricity
Solubility - insoluble because of the strong covalent bonds within the layers

55
Q

Describe the melting points of diamond and graphite

A

Very high melting point because they contain strong covalent bonds

56
Q

Why does alloying a metal make the metal harder

A

Because the regular layers in a pure metal are distorted by atoms of different sizes in an alloy, so the layers no longer slide over eachother making them harder

57
Q

Explain why aluminium (group 3) has a higher melting point than sodium ( group 1 )

A

Because aluminium atoms form al3+ ions which have a stronger attraction to delocalised electrons compared to sodiums Na+ ions.

Aluminium also contributes 3 delocalised electrons per atom strengthening the metallic bond, whereas sodium only contributes 1

The smaller size of aluminium ions further increases the strength of the electrostatic attraction making metallic bonding in aluminium much stronger requiring more energy to break resulting in a higher melting point

58
Q

What is electrostatic bonding

A

The force of attraction between oppositely charged particles, in ionic compounds it it the force that holds positively charged ions and negatively charged ions together

59
Q

What is graphene and its properties

A

Graphene is a single layer of graphite and so is one atom thick
Its properties, such as its excellent electrical conductivity, will help create new developments in the electronics industry in the future

60
Q

Describe the shape of buckminster fullerene and state its molecular formula

A

a ball shaped molecule made from 60 carbon atoms forming hexagonal and pentagonal bonds around the edge of a sphere
Molecular formulary C60

61
Q

Describe how fullerenes can be used in medicine

A

Hollow- so you can put medicines inside it designed to target specific cells

62
Q

Explain why fullerenes make good catalysts

A

They have a huge surface area compared to volume ratio which gives them potential uses in applications that rely on surface area like catalysts

63
Q

Explain where the name buckminster fullerene comes from

A

Named after the eccentric inventor buckminster fuller

64
Q

Are giant covalent structures soluble

A

No they are insolable in water

65
Q

What is the cause for low melting and boiling points

A

Weak intermolecular forces between molecules

66
Q

Why is buckminster fullerene lubricant

A
  1. Because its molecules are shaped like hollow spheres
  2. These spherical molecules can roll over each other
  3. Reducing friction between surfaces
  4. Making it an effective lubricant
67
Q

Why is silicone dioxide good for a welding blanket

A
  1. it has a high melting point so it can withstand the extreme temperatures met during welding without melting
  2. It is a poor conductor of heat, providing thermal insulation and helps to protect surrounding areas or people from heat
  3. Non flammable making it safe for use around sparks and flames generated during welding
68
Q

Why is nitinol good for dental braces

A
  1. Shape memory property meaning it returns to original shape after being deformed
  2. Consistent pressure on teeth applying consistent gentle pressure to gradually move teeth into place
  3. It is flexible and can withstand the forces in the mouth without breaking
  4. Biocompatible so safe for use in the body
69
Q

Why are metals good at conducting electricity

A

Metals are good conductors of electricity because there is a sea of delocalized electrons that can move freely and carry electric charge throughout the structure

chemistry EOY 👸 (4 decks)

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