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Flashcards in Definitions Deck (46)
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1

Acidic Oxide

Oxide that lowers pH in water

2

Activation energy

minimum energy needed for colliding particles to react

3

Addition Polymerisation

Monomers combining to form a large molecule

4

Adsorption

The method of attachment of gaseous or liquid molecules to solid surface

5

Atomic Absorption Spectrometry (AAS)

instrumental method used to analyse water for heavy metls

6

Atomic number

number of protons in nucleus

7

Atomic orbital

Region around nucleus in which there is a high probability of finding electron

8

Bond energy

average energy required to break 1 mole of bonds into separate atoms in the gaseous state

9

catalyst

substance that alters rate of a reaction and is not used up

10

catalytic poison

substance that blocks the active site of a catalyst and stops it working eg. Pb for Pt, Pd and Rh in a catalytic converter

11

Chemical equilibrium

state in which rate of forward reaction = rate of reverse reaction

12

chromatography

separation of a mixture of components based on their relative attractions for a stationary phase while carried by a mobile phase

13

condensation reaction

production of a more complex molecule with formation of an unsaturated compound (or double bond) by the loss of a small molecule

14

covalent bond

involving sharing of one or more pairs of electrons

15

crystals

regular solids made up of particles with faces intersecting at fixed angles or consisting of particles in a lattice

16

Dobereiner's Tiads

elements of similar properties in groups of three

17

Dynamic

reaction has notstopped

18

Effective collision

one that results in a reaction

19

electrolysis

chemical reaction caused by electric current passing through an electrolyte

20

electronegativity

measure of relative attraction for shared electrons

21

equilibrium

rate of forward reaction = rate of reverse reaction

22

eutrophication

excess plant growth caused by excess nutrient in water

23

feedstock

Modified and purified raw materials

24

flocculation

clumping of suspended solids in the water

25

greenhouse factor

stating its influence on the greenhouse effect compared with carbon dioxide

26

greenhouse effect

blocking the escape of radiation by gases in the atmosphere

27

greenhouse gas

atmospheric gas that prevents escape of heat

28

heterogeneous catalyst

reactants and catalyst in different phases

29

homogeneous catalyst

reactants and catalyst in the same phase

30

homologous series

group of organic chemicals which have the same general formula or differ by CH2 or same functional group