glossary Flashcards
acid
a substance that can give up hydrogen in a chemical reaction and always has pH less than 7
acid rain
happens when oxides made in combustion combine with water vapour in the air
change of state
the conversion of a substance from one form to another
compound
a chemical substance made of different elements linked to one another
concentration
how many particles of a substance there are mixed with a certain number of particles of water
condensation
the change of state from gas (vapour) to liquid, speeded by by cooling
conductor
a material that is good at transferring thermal to electrical energy
fuel
a substance that can be burned to release energy
evaporation
the change of state from liquid to gas (vapour) speeded up by heating
insoluble
a substance that is unable to dissolve in a solvent
element
a substance made of only one type of atom
product
the material present after a chemical change has taken place
states of matter
the forms in which a substance can exist as solid, liquid or gas
soluble
a substance that dissolves in a solvent when a solution is made
variable
something (a factor) that changes during the course of an expirement
