Y10 Module 5 Key Words

alkali metal
an element found in group 1 of the periodic table. alkali metals include lithium, sodium and potassium
alkaline
a substance that turns universal indicator paper blue and has a pH greater than 7
alloy
a mixture of metals or non-metals
analyse
to study a substance carefully to find out which chemicals it contains
analytical
analytical tests are experimenmts to find out which chemicals a susbtance contains. the results of these tests are called analytical data
atomic number
the number of protons in an element. the smaller number of the two
atoms
the smallest part of an element
bond
a chemical join between two atoms
chemical reaction
a chemical change in which new substances are formed but there is no change in the number of atoms of each element
chemical symbol
a code for an element consisting of one, two or three letters
compound
two or more different elements chemically joined together
corrosion
the chemical reaction between a metal and air or water
density
mass divided by volume
diatomic molecule
a molecule made of two atoms
displacement
a reaction where a more reactive substnace replaces a less reactive one
ductile
able to be pulled into thin wires
electron
a very small negatively charged particle found around the nucleus of an atom
element
a substance made of only one type of atom
endothermic
a reaction in which energy is taken it. the reaction gets colder
exothermic
a reaction in which energy is given out. the reaction gets hotter
flame test
a test to find out which metals are present in a substance
formula
the code for a substance showing which elements are present
group
a vertical column on the periodic table containing elements that react in similar ways
halogen
an element found in group 7, for example fluorine, chlorine and bromine
inert
unreactive
insoluble
will not dissolve
malleable
can be bent or hammered into shape
molecule
a particle made by chemically bonding two or more atoms
neutron
a particle found in the nucleus of an atom. it has no charge
noble gas
an element found in group 8 (or 0), for example helium, neon and argon
period
a row on the periodic table
precipitate
a solid that is formed when two solutions are reacted together
proton
postively charged particle fouiund in the nucleus
rust
iron oxide – formed when oxygen reacts with iron
sediment
a solid that sinks to the bottom of a liquid without dissolving
soluble
will dissolve
solution
the mixture formed when a substance dissolves in a liquid
sterilize
kill microorganisms such as bacteria
suspension
a solid mixed evenly with a liquid without dissolving
toxic
posionous
transition metal
an element found in the centr of the periodic table, for example, gold, iron and copper
trend
a gradual change

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