reactivity series of metals Flashcards
what is the reactivity in decreases
potassium / most reactive sodium calcium magnesium aluminium zinc iron copper / least reactive
why is aluminium less reactive
due to protective layer of aluminium oxide which forms on the surface of the layer
what is the general equation for metal reacting with cold water
metal + cold water > metal hydroxide + hydrogen
what are the observations if potassium was the metal reacting with cold water
metal floats on the surface metal moves crackles at the end lilac flame observed alkaline solution produced
potassium + water > potassium hydroxide + hydrogen
what are the observations if sodium was the metal reacting with cold water
metal floats on surface
metal melts into a ball
metal gets smaller and eventually disappears
sodium + water > sodium hydroxide + hydrogen
what are the observations when calcium reacts with cold water
calcium sinks and then moves up and down effervescent reaction heats up cloudy solution is formed eventually the metal disappears
calcium + water > calcium hydroxide + hydrogen
why is sodium or potassium stored under oil
so it doesn’t react with oxygen and moisture in the air during storage
what is the general equation for metals reacting with steam
metal + steam > metal oxide + hydrogen
what are the observations when magnesium reacts with steam
what is the word equation
grey magnesium solid burns with a bright white light
white ash remains
magnesium + steam > magnesium oxide + hydrogen
what does copper not react with
cold water or steam as it is used in pipes
what is the general equations for metal reacting with acid
metal + acid > metal salt + hydrogen
example questions
complete the following equations\
magnesium + hydrochloric acid >
copper + sulfuric acid >
aluminium + sulfuric acid >
magnesuim chloride + hydrogen
nothing happens
aluminium sulfate + hydrogen
what is the definition of displacement
is a reaction in which a more reactive metal will replace or take the place of a less reactive metal from a solution of its metal compound
what happens in the magnesium copper reaction
magnesium + coper sulfate > magnesium sulfate + copper
grey solid disappears
red brown solid appears
blue solution begins to fade and eventually goes colourless
heat is evolved
