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Chemistry > Key Words > Flashcards

Key Words Flashcards

1
Q

Aldehyde

A

An organic compound with the general formula RCHO

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2
Q

Alkaline earth metal

A

Metals in group 2 of the periodic table

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3
Q

Alkane

A

The hydrocarbon with C-C and C-H single bond

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4
Q

Allotopes

A

Pure elements which can exist in different physical forms in which their atoms are arranged differently.

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5
Q

Anaerobic respiration

A

The process which energy is released and new compounds fromed in living things in the absences of oxygen

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6
Q

Atom economy

A

Efficiently of a chemical reaction by comparing the total number of atoms in the product with starting total

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7
Q

Atomic orbital

A

A region space around an atomic nucleus where there is a high probability of finding an electron

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8
Q

Avogadro constant

A

The total number of particles in a mole of substance.

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9
Q

Bond dissociation enthalpy

A

The enthalpy change required to break a covalent bond with all species in the gaseous state

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10
Q

Calorimeter

A

An instrument for measuring the heat change that accompany a chemical reaction

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11
Q

Catalyst

A

A substance that alters the rate of a chemical reaction but is not used up in the reaction

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12
Q

Catalytic cracking

A

The breaking, with the aid of a catalyst, of long chain alkane molecules into shorter hydrocarbons

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13
Q

Carbocation

A

An organic ion in which one of the carbon atoms has a positive charge

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14
Q

Carbon-netraul

A

A process or series of processes in which as much carbon dioxide is absorbed from the air as is given out

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15
Q

Chemical feedstock

A

The starting materials in an industrial chemical reaction

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16
Q

Co-ordinate bonding

A

Covalent bonding in which both electrons in the bond come from one of the atoms in the bond

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17
Q

Covalent bonding

A

Describes a chemical bond in pair of electrons are shared between two atoms

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18
Q

Activation energy

A

The minimum energy that a particle in order to react: the energy difference between the reactants and transition state

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19
Q

Dative covalent bond

A

Covalent bonding in which both electrons in the bond come from one the binds in the pair

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20
Q

Delocalised electron

A

Describes electron that are spread over several atoms and help to bond them together

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21
Q

Dipole-dipole force

A

An intermolecular force that results from the attraction between molecules with permeant dipoles

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22
Q

Displacement reaction

A

A chemical reaction in which one atom or group of atom replaces another in a compound

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23
Q

Displayed formula

A

The formula of a compound drawn out so that each atom and each bond is shown

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24
Q

Disproportionation

A

Describes a redox reaction in which the oxidation number of some atoms of a particular element increases and that of other atoms of the same element decreases

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25
Q

Dynamic equilibrium

A

A situation in which the composition of a contrast concentration reaction mixture does not change because both forward and backward reactions are proceeding at the same rate

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26
Q

Electron density

A

The probability of electrons being found in a particular volume of space

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27
Q

Electron pair repulsion theory

A

A theory which explains the shapes of simple molecules by assuming that pairs of electrons around a central atom repel each other and thus take up positions as far away as possible from each other in space

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28
Q

Electronegativity

A

The power of an atom to attract the electrons in covalent bond

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29
Q

Electrophile

A

An electron-deficient atom, ion or molecules that takes part in an organic reaction by attacking areas of high electron density in another reactant

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30
Q

Electrophilic addition

A

A reaction in which a carbon-carbon double bond is attacking an electrophile

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31
Q

Electrostatic forces

A

The forces of attraction and repulsion between electrically charged particles

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32
Q

Elimination

A

A reaction in which an atom or group of atoms is removed from a rectant

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33
Q

Empirical formula

A

The simplest whole number ratio of atoms of each element in a compound

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34
Q

Endothermic

A

Describes a reaction in which heat is taken in as the reactant change to products

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35
Q

Enthalpy change

A

A measure of heat energy given out and taken in when a chemical or physical change occurs at constant pressure

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36
Q

Enthalpy diagrams

A

Diagrams in which the enthalpies of the reactants and products of a chemical reaction are plotted on a vertical scale to show their relative levels

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37
Q

Equilibrium mixture

A

The mixture of reactants and products formed when a reversible reaction is allowed to proceed in a closed container until no further change occurs. The forward and backwards reaction are still proceeding but at the same rate

38
Q

Exothermic

A

Describes a reaction in which heat is given out as the temperature thus rise

39
Q

Fingerprints region

A

The area of an infra-red spectrum below about 1500 cm-1. It is caused by complex vibrations of the whole molecule and is characteristic of a particular molecules

40
Q

Fraction

A

A mixture a hydrocarbons collected over a particular range of boiling points during the fractionation crude oil

41
Q

Free radical

A

A chemical species with an unpaired electron

42
Q

Functional group

A

An atom or group of toms in an organic molecule which is responsible for the reaction of that molecule

43
Q

Group

A

A vertical column of elements in the periodic table. The elements have similar properties because they have the same outer electron arrangement

44
Q

Half equation

A

An equation for the redox reaction which considers just one of the species involved and shows explicitly the electrons transferred to or from it

45
Q

Homologous series

A

A set of organic compound with the same functional group. The compounds differ in the length of their hydrocarbon chains

46
Q

Hydrogen bonding

A

A type of intermolecular force in which hydrogen atom interacts with a more electronegative atom

47
Q

Incomplete combustion

A

A combustion reaction in which there is insufficient oxygen for all the carbon in the fuel to burn to carbon dioxide. Carbon monoxide is formed

48
Q

Ionic bonding

A

Describes a chemical bond in which an electron or electrons are transferred from one atom to another, resulting in the formation of oppositely charged ions with electrostatic forces of attraction between them

49
Q

Ionisation energy

A

The energy required to remove a mole of electrons from a mole of isolated gaseous atoms or ions

50
Q

Isomer

A

One of two compounds with the same molecular formula but different arrangement of atoms in space

51
Q

Ketone

A

An organic compounds with the general formula with a c=o

52
Q

Lattice

A

A regular three dimensional arrangement of atoms, ions and molecules

53
Q

Leaving group

A

In an organic substitution reaction, the leaving group is an atom or group of atoms that is ejected from the starting material, normally taking with it an electron pair and forming a negative ion

54
Q

Lone pair

A

A pair of electrons in the outer shell of an atom that is not involved in bonding

55
Q

Maxwell-Boltzmann distribution

A

The distribution of energies of the molecules in a gas or liquid

56
Q

Mean bond enthalpy

A

The average value of the bond dissociation enthalpy for a given type of bond taken from a range of different compounds

57
Q

metallic bonding

A

describes a chemical bond in which outer electrons are delocalised within the lattice of metal ions

58
Q

mole

A

a quality o f a substance that contains the Avogadro number of particles

59
Q

molecular formula

A

a formula that tells us the actual numbers of atoms of each different element that makes up a molecule of a compound

60
Q

molecular ion

A

in mass spectrometry this is a molecule of the sample which has been ionised but which has not broken up during its flight through the instrument

61
Q

monomer

A

a small molecule that combines with many other monomers to form a polymer

62
Q

nucleons

A

protons and neutrons

63
Q

nucleophile

A

an ion or group of atoms with a negatively-charged area that takes part in an organic reaction by attacking an electron-deficient area in another reactant

64
Q

nucleophilic substitution

A

an organic reaction in which a molecule with a partially positively charged carbon atom is attacked by a reagent with a negatively charged area.

65
Q

nucleus

A

the tiny, positively charged centre of an atom

66
Q

oxidation

A

a reaction in which an atom or group of atom lose electrons

67
Q

oxidation state (oxidation number)

A

the number of electrons lost or gained by an atom in a compound to the uncombined atom. it forms the basis of a way of keeping track of redox reaction

68
Q

oxidising agent

A

a reagent that oxidised another species

69
Q

percentage yield

A

in a chemical reaction, this is the actual amount of product produced divided by the theoretical amount

70
Q

period

A

a horizontal row of elements in the periodic table.

71
Q

periodicity

A

regular recurrence of the properties of elements when they are arranged in atomic number order

72
Q

polar

A

describes a molecule in which the charge is not symmetrically distributed so that one area is slightly positively charged and another slightly negatively charged

73
Q

positive inductive effect

A

describes the tendency of some atoms or groups of atoms to release electrons via a covalent bond

74
Q

proton number

A

the number of protons in the nucleus of an atom

75
Q

redox reaction

A

oxidation and redox reaction

76
Q

reducing agent

A

a reagent that reduces another species

77
Q

reduction

A

a reaction in which an atom or group of atoms gain electrons

78
Q

relative atomic mass

A

average mass of an atom / (1/12) of the mass of 1 atom of carbon 12

79
Q

relative formula mass

A

average mass of an entity / (1/12) of the mass of 1 atom of carbon 12

80
Q

relative molecular mass

A

average mass of an molecule / (1/12) of the mass of 1 atom of carbon 12

81
Q

saturated hydrocarbon

A

a compound containing only hydrogen and carbon bonds only

82
Q

specific heat capacity

A

the amount of heat needed to raise the temperature of 1g of substance by 1K

83
Q

spectator ions

A

ions that are uncharged during a chemical reaction, that is, they take no part in the reaction

84
Q

standard molar enthalpy change of combustion

A

the enthalpy change when 1 mole of a substance is completely burned in oxygen with all reactants and products in their standard states

85
Q

standard molar enthalpy change of formation

A

the enthalpy change when 1 mole of substance is formed from its elements with all reactants and products in their standard states

86
Q

stereoisomer

A

isomer with the same molecular formula and the same structure, but a different position of atoms in space

87
Q

stoichiometry

A

describes the simple whole number ratios in which chemical species react

88
Q

strong nuclear force

A

the force that holds protons and neutrons together in the nucleus

89
Q

structural formula

A

a way of writing the formula of an organic compound in which bonds are not shown but each carbon atom is written separately with the atom or groups of atoms attached to it

90
Q

structural isomer

A

isomer with the same molecular formula but a different structure

91
Q

thermochemical cycle

A

a sequence of chemcial reactions that convert a reactant into a product. the total enthalpy hcange of the sequence of reactions will be the same as that for the conversion of the recatnats to the product directly

92
Q

van der Waals force

A

an intermolecular force of attraction that is caused by instantaneous dipoles and acts between all atoms and molcules

Chemistry (20 decks)

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