Unit 1- Chemistry- [A1] Structure an bonding in applications in c

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What does the nucleus include?

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This is specifically for the BTEC foundation diploma Pearson edexcel course however, you can use this for A-level chemistry as it is the same content

80 Terms

1

What does the nucleus include?

protons, neutrons and electrons

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2

What is the relative mass of a proton?

1

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3

What is the relative mass of an electron?

1

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4

What is the relative mass of a neutron?

0

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5

What are the electrons in around the nucleus?

shells

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6

Where are protons and neutrons found in an atom?

in the centre

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7

How many electrons can the first shell hold?

2

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8

How many electrons can the second shell hold?

8

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9

How many electrons can the third shell hold?

18

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10

How many electrons can the fourth shell hold?

32

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11

What are orbitals?

regions where there is a 95% probability of locating an electron

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12

How many electrons can an orbital hold?

2

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13

What are the names of the different orbitals?

s,p,d and f

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14

Do all the orbitals have the same energy?

no, they have different energy states

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15

What are cations?

positively charges ions

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16

What are anions?

negatively charged ions

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17

What is Aufbau principle?

the electrons fill the orbitals with the lowest available energy state in relation to the proximity to the nucleus before filling orbitals with higher energy states.

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18

what does the Aufbau principle do ?

gives the most stable electron configuration

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19

What is the meaning of electron configuration?

the distribution of electrons in an atom or molecule

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20

What is the meaning of spin?

in an orbital, each electron will be a different spin state

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21

What can the first shell hold in written notation?

2 electrons

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22

What type of orbital is in the first shell?

s orbital

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23

What type of orbital is at the second shell?

s and p orbitals

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24

What do the half arrows represent?

the spin of different electrons

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25

What is ionic bonding?

electrostatic attraction between two oppositely charged ions

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26

What do you use to represent ionic bonding?

dot and cross diagram

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27

What is electrostatic attraction?

the force experienced by oppositely charged particles

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28

What is a giant ionic lattice?

a regular arrangement of positive ions and negative ions

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29

What is an example of a giant ionic lattice?

sodium chloride

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30

What does the strength of the ionic bond dependent on?

the ionic charge and the ionic radii of ions

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31

What would happen if the the ionic compound had more positive ions?

the more shells it would have

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32

If the ionic charge is higher…

the electrostatic force is stronger

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33

What does ionic bonding occur between?

non-metal and metal

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34

What is Bohr theory?

plum pudding model

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35

What is covalent bonding?

when an electron is shared between the atoms

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36

What does a covalent bond usually occur between?

non-metal and non-metal

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37

What is it called when both sharing electrons come from one atom?

dative covalent bond

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38

What is dative bonding also known as?

Coordinate bonding

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39

What is it called if three pairs of electrons are shared?

a triple covalent bond

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40

The shorter the length of the bond….

the stronger the bond is

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41

True or false, single bonds have a greater length than double bonds ?

true

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42

Do double bonds have a greater length than triple bonds?

yes

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43

Are triple bonds stronger than double bond and single bonds?

yes

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44

How does ammonia form a dative bond with hydrochloric acid?

when ammonia reacts with HCL, a hydrogen ion from the acid transfers to the ammonia molecule. a lone pair of electrons on the nitrogen atom forms a dative bond with the hydrogen ion.

<p>when ammonia reacts with HCL, a hydrogen ion from the acid transfers to the ammonia molecule. a <strong>lone pair</strong> of electrons on the nitrogen atom forms a dative bond with the hydrogen ion.</p>
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45

What does lone pair of electrons mean?

a non-binding pair of electrons

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46

What is an organic compound?

a compound that contains one or more carbons in a carbon chain

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47

What does having four bonds mean?

it has a tetrahedral shape

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48

What is the bond molecule angle?

109.5

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49

What is metallic bonding?

the highest level of a metal atom has the ability to become delocalised

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50

What is the meaning of electronegativity?

the tendency of an atom to attract a bonding pair of electron

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51

What is the meaning of when a molecule is non-polar?

a molecule where the electrons are distributed evenly throughout the molecule

<p>a molecule where the electrons are distributed evenly throughout the molecule</p>
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52

What is the meaning of a polar molecule?

a molecule with partial positive charge in one part of the molecule and similar negative charge in another part due to an uneven electron distribution

<p>a molecule with partial positive charge in one part of the molecule and similar negative charge in another part due to an uneven electron distribution</p>
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53

What are intermolecular forces?

the attraction or repulsion between neighbouring molecules

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54

What is the meaning of dipole?

separation of charges within a covalent molecule

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55

What are the two types of dipole forces?

temporary dipole and induced dipole are the weak forces present in non-polar covalent molecules

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56
<p>What is A on the picture?</p>

What is A on the picture?

more electrons

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57
<p>What is B on the picture?</p>

What is B on the picture?

more movement

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58
<p>What is C on the picture?</p>

What is C on the picture?

bigger dipoles

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59
<p>What is D on the picture?</p>

What is D on the picture?

stronger attraction

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60

What are the only types of forces that exist between noble gases and non-polar molecules?

London dispersion forces

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61

What is the meaning of Van der waals forces?

all intermolecular attractions are an der waals forces

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62
<p>What are <strong>dipole-dipole </strong>forces?</p>

What are dipole-dipole forces?

permanent forces between polar molecules

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63

What do polar molecules have?

a permanent negative and permanent positive end

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64

What do these oppositely charged ends do?

attract each other

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65

Are dipole-dipole forces stronger or weaker than London dispersion forces?

slightly stronger but are still weak in comparison to a covalent bond

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66

What are some examples of molecules that have a permanent dipole-dipole forces?

hydrogen chloride, iodine monochloride

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67

What is the strongest form of intermolecular force?

hydrogen bond

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68

What is a hydrogen bond?

a special type of dipole-dipole bond and are forces that are 10% of the strength of a covalent bond

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69

When do hydrogen bonds form?

when compounds have hydrogen directly bonded to fluorine, oxygen or nitrogen

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70

Why is it that a hydrogen bond forms only when it is directly bonded to some elements?

there is a large difference in electronegativity between hydrogen and the three atoms. This difference means that very polar bonds are formed so the molecules have permanent dipoles. When two of these molecules are close together, there will be an attraction between the positive end and the lone pair. This is the hydrogen bond

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71

What is the formula for moles?

moles=mass /Mr

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72

What is the empirical formula?

the ration between elements in a chemical compound

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73

What is a titration?

a method of volumetric analysis used to calculate the concentration of a solution

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74

What is a solution?

a liquid mixture where a solute is dissolved in a solvent

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75

What is a standard solution?

a solution of a known concentration used in volumetric analysis

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76

What is a solute?

the substance dissolved in a solvent to form a solution

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77

What is a solvent?

a liquid that dissolves another substance

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78

What is theoretical mass?

the expected amount of product from a reaction calculated from the balanced equation

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79

What is the percentage yield?

the actual amount of mass worked out as a percentage of the theoretical mass

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80

What is the formula for percentage yield?

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