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Atoms Elements Compounds Mixtures @ AJHS NZ

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

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.  


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Created by: johncl