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8E Atoms Elements Co

Atoms Elements Compounds Mixtures @ AJHS NZ

QuestionAnswer
alloy A mixture of different metals.
atom The smallest part of an element you can get.
boiling point When a liquid is at its boiling point it is as hot as it can get. It is evaporating as fast as it can.
bond Force holding atoms together.
calcium A metal which reacts easily with water.
chemical formula A combination of symbols and numbers that shows how many atoms of different kinds there are in a particular molecule. In compounds that do not form molecules, it shows the ratio of elements in the compound.
chromatography Separating dissolved solids from one another. The solids are usually coloured.
compounds Substances that can be split up into simpler substances.
decompose Break down into simpler parts.
distillation Separating a liquid from a solution by evaporating the liquid and then condensing it.
electrical conductor Something which allows electricity to flow through it easily.
element All the atoms in an element are the same. A substance that cannot be split up into anything simpler by chemical reactions.
evaporate When a liquid turns into a gas.
freezing point The temperature at which a liquid turns into a solid.
heat conductor Something which allows heat to flow through it easily.
high melting point Something with a high melting point has to be at a very high temperature before it melts. It is a solid at room temperature.
irreversible change Permanent change.
low boiling point Something with a low boiling point will turn into a gas at a relatively low temperature. It can be a solid, liquid or gas at room temperature.
magnetic A metal (iron, nickel or cobalt) that can be magnetised or attracted to a magnet.
melting point The temperature at which a solid turns into a liquid.
metals Elements that are shiny, conduct heat and electricity well, and often have high melting and boiling points.
mixture Two or more different kinds of particles that are not chemically joined to each other.
molecule Two or more atoms joined together.
non-metals Elements that are not shiny, and do not conduct heat and electricity well.
oxide A compound that includes oxygen.
Periodic Table Table that shows all the elements.
physical change A change where no new substances are formed.
potassium Soft, shiny, reactive, silver-coloured metal.
precipitate Insoluble solid produced by mixing two solutions.
product New chemical formed in a chemical reaction.
properties Ways of describing a substance.
pure A substance that does not have anything else in it.
reactants Chemicals that join together to form a new substance.
shiny Reflects light well.
sodium chloride Chemical name for common salt.
sulphur A yellow, non-metal element. Solid at room temperature
symbol equation A way of writing out what happens in a chemical reaction using the symbols that represent the substances involved.
symbol The letter or letters that represent an element.
Created by: johncl
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