NCEA level 1 Science: Shelley Dudley’s class and ions.

You have learned a lot about ions recently. How much do you remember from Friday’s lesson?

1. Reacting sodium with chlorine: electron transfer and turning atoms into ions


Electrolysis of copper chloride: turning ions back into atoms

with electrical energy supplied by a power pack.



Some questions for experts.

We talked briefly about oxidising agents. When elements burn in oxygen we say they have become oxidised.

Magnesium burning in air.

                       2Mg + O2 —-> 2MgO

We say that magnesium has been oxidised to magnesium oxide

Magnesium also burns in chlorine

                       2Mg + CL2 —-> MgCL2

Why do we say that magnesium has been oxidised to magnesium chloride?

………and some links to related chemistry.

the thermite reaction

the reactivity series

balancing chemical equations and reactions of metals with acids

writing chemical formulae

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