Images: Chemical Testing
Calcium:
Ca 2+ reacting with fire.
Lithium:
Li 2+ reacting with fire
Sodium:
Na 2+ reacting with fire
Copper:
Cu 2+ reacting with fire
Potassium:
K+ reacting with fire
Ca 2+ reacting with fire.
Lithium:
Li 2+ reacting with fire
Sodium:
Na 2+ reacting with fire
Copper:
Cu 2+ reacting with fire
Potassium:
K+ reacting with fire
MONDAY, 14 MARCH 2011
Reactions and Products
During chemical reactions atoms become bounded (joined) together in new ways.
Magnesium + copper oxide = magnesium Oxide + Copper
Chemical reactions are different to physical changes. In physical changes, atoms remain bounded in the same way before and after a change.
Chemical Changes/ chemical reactions.
In chemical reactions new substances are formed. We call the starting materials reactants and the substances that are formed: products.
During chemical changes (reactions) different atoms become bonded.
Chemical bonds are not easy to break.
Because of this chemical changes are usually difficult to reverse (It is difficult to change product back into reactants) e.g. we cannot “un-burn” magnesium, and we cannot un-bake a cake :)
Magnesium + copper oxide = magnesium Oxide + Copper
Chemical reactions are different to physical changes. In physical changes, atoms remain bounded in the same way before and after a change.
Chemical Changes/ chemical reactions.
In chemical reactions new substances are formed. We call the starting materials reactants and the substances that are formed: products.
During chemical changes (reactions) different atoms become bonded.
Chemical bonds are not easy to break.
Because of this chemical changes are usually difficult to reverse (It is difficult to change product back into reactants) e.g. we cannot “un-burn” magnesium, and we cannot un-bake a cake :)
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