AQA A Level Chemistry

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What is an ion?

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AS Bonding

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1

What is an ion?

An ion is a charged particle that has either lost or gained electrons.

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2

What is an ionic bond?

An ionic bond is formed by the transfer of electrons from one atom to another, resulting in the attraction between positively and negatively charged ions.

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3

How are ions formed?

Ions are formed by the loss or gain of electrons.

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4

What is the charge of a cation?

Cations have a positive charge.

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5

What is the charge of an anion?

Anions have a negative charge.

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6

How do ions achieve stability?

Ions achieve stability by attaining a noble gas electron configuration.

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7

What is the difference between cations and anions?

Cations are positively charged ions, while anions are negatively charged ions.

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8

What is an example of an ionic compound?

Sodium chloride (NaCl) is an example of an ionic compound.

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9

How is an ionic bond formed?

An ionic bond is formed through the transfer of electrons from a metal to a non-metal.

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10

What is electronegativity?

Electronegativity is the tendency of an atom to attract electrons in a bond.

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11

What is a covalent bond?

A covalent bond is formed when electrons are shared between atoms.

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12

How are electrons shared in covalent bonds?

Electrons can be shared equally or unequally in covalent bonds.

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13

What is the difference between ionic and covalent bonds?

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

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14

What determines bond polarity?

Bond polarity is determined by the difference in electronegativity values between the bonding atoms.

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15

What is a polar covalent bond?

A polar covalent bond is formed when electrons are shared unequally between atoms.

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16

What is a nonpolar covalent bond?

A nonpolar covalent bond is formed when electrons are shared equally between atoms.

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17

How do you determine bond type?

You determine bond type by examining the difference in electronegativity between the atoms.

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18

What is an example of a polar molecule?

Water (H2O) is an example of a polar molecule.

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19

How do lone pairs affect bond polarity?

Lone pairs can increase the polarity of a molecule by affecting the distribution of electron density.

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20

What determines molecular shape?

Molecular shape is determined by the arrangement of electron pairs around the central atom.

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21

What is the VSEPR theory?

The Valence Shell Electron Pair Repulsion (VSEPR) theory states that electron pairs repel each other to minimize their energy.

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22

What is the shape of CO2?

The shape of carbon dioxide (CO2) is linear.

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23

What is the shape of H2O?

The shape of water (H2O) is bent or angular.

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24

What is the shape of NH3?

The shape of ammonia (NH3) is trigonal pyramidal.

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25

What is the shape of CH4?

The shape of methane (CH4) is tetrahedral.

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26

What is the shape of BF3?

The shape of boron trifluoride (BF3) is trigonal planar.

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27

What is the shape of SF6?

The shape of sulfur hexafluoride (SF6) is octahedral.

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28

What is the shape of NH4+?

The shape of ammonium (NH4+) is tetrahedral.

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29

What is the significance of lone pairs?

Lone pairs affect molecular geometry and can influence bond angles.

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30

What is polarization?

Polarization is the distortion of an electron cloud around a molecule.

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31

What are intermolecular forces?

Intermolecular forces are the forces of attraction or repulsion between molecules.

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32

What is the strongest intermolecular force?

Hydrogen bonding is the strongest intermolecular force.

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33

What is the weakest intermolecular force?

London dispersion forces are the weakest intermolecular force.

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34

What is the force between polar molecules?

The force between polar molecules is dipole-dipole attraction.

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35

What is the force between nonpolar molecules?

The force between nonpolar molecules is London dispersion forces.

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36

What is an example of London dispersion forces?

London dispersion forces are found in hydrocarbons and noble gases.

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37

What is an example of dipole-dipole forces?

Water (H2O) exhibits dipole-dipole forces.

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38

What is an example of hydrogen bonding?

Hydrogen bonding occurs when hydrogen is attached to nitrogen, oxygen, or fluorine.

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39

What affects the strength of intermolecular forces?

Molecular polarity and size affect the strength of intermolecular forces.

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40

What is metallic bonding?

Metallic bonding is the sharing of delocalized electrons among a lattice of metal cations.

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41

What are properties of metals?

Properties of metals include high conductivity, malleability, and ductility.

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42

What is the significance of delocalized electrons?

Delocalized electrons contribute to the conductivity and malleability of metals.

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43

What is the relationship between metallic bonding and conductivity?

Metallic bonding allows for high conductivity in metals due to the free movement of electrons.

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44

What is the relationship between metallic bonding and malleability?

Metallic bonding provides malleability as layers of atoms can slide past each other.

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45

How do metallic bonds contribute to ductility?

Metallic bonds allow metals to be stretched into wires without breaking.

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46

What is the difference between pure metals and alloys?

Pure metals consist of one type of metal atom, while alloys contain more than one type of metal.

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47

What is the effect of alloying on properties?

Alloying can alter properties for specific purposes, enhancing strength or corrosion resistance.

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48

What is the significance of lattice structure in metals?

The lattice structure in metals influences their physical properties, including melting and boiling points.

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49

How do metallic bonds affect melting and boiling points?

Metallic bonds generally contribute to high melting and boiling points in metals.

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