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Burning a piece of wood is physical or chemical reaction?
chemical reaction
melting chocolate is physical reaction or chemical reaction?
physical reaction
cooking an egg is physical or chemical reaction?
chemical change
Heating glass and bent it, is physical or chemical change?
physical change
Baking a cake is physical or chemical change?
chemical change
Reacction between zink metal and sulfuric acid produce a gas. what is this gas?
Hydrogen
Name the element formed when magnesium react with oxygen?
magnesium oxide
What is compound formed when magnesium react with chlorine?
magnesium chloride
What is characteristic of physical change?
no new subsntance formed
what is characteristic of chemical change?
new substance is formed
