Page 185 - Science Coursebook

Glossary and index

algal bloom a big population of catalase an enzyme found
algae in a lake, river or sea, often in living cells that speeds up the
caused by fertiliser 34 breakdown of hydrogen peroxide 117

alkali metals metals in Group 1 catalyst a substance that speeds
of the Periodic Table that produce up a reaction but remains unchanged
alkalis when they react with water 64 by the reaction 116, 117
ammeter a meter used to measure cell (electrical) a battery, a device
electric current 148 that produces a voltage in a circuit 147
amp the unit of electric current; charge see electric charge 60–62
symbol A 148
chemical energy energy stored in
annual plants plants that chemical substances 70, 71, 74, 151, 162, 163
germinate, grow, flower, produce choice chamber a piece of

seeds and die in less than a year 23
apparatus in which small animals are

anthers the parts of a flower in given a choice of places to go with

which pollen is made 12 different conditions, for example dark
or light 25
aquatic living in water 23
chromosomes threads of DNA,
atmospheric pressure the
pressure of the atmosphere 130 found in the nucleus of a cell, which
are made up of thousands of genes 48, 49
atom a very small particle of an
element 60, 61 circuit diagram a representation
of an electric circuit using standard
atomic number the number of symbols 147, 148
protons in an atom; each type of
atom has a unique atomic number 62 circuit symbol a symbol
representing any component in an
base a metal oxide; soluble bases electric circuit 147, 148, 176
dissolve in water to form alkalis 101
collision bumping into something 107
biodiversity the number of
different species in a particular area 36 combustion burning 70, 71

conductor an object or material
biological catalyst another term
for an enzyme 117 through which electric current
can pass 146, 167
blast furnace a structure used for
the large-scale production of iron convection the transfer of heat
from iron ore 90 energy from one place to another,
carried by the material as it moves 168, 169
carbohydrate a group of

chemicals found in living organisms, convection current the flow of
which includes sugar, starch and cellulose 6 a hot gas or liquid, carrying heat
energy with it 168
carnivore an animal that eats
other animals 29

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