oxygen and oxides
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how do you measure the % of oxygen?
by reacting it with another element-typically a metal
if the air in one of these experiments doesnt decrease by 21% why could it be?
• the metal wasnt heated for long enough for all the oxygen to be reacted • theres a leak in the apparatus
what is element combustion?
when an element reacts with oxygen to produce an oxide
what oxide name does a metal take?
metal oxide
what oxide name does a non-metal take?
non-metal dioxide
what states are metal oxides?
solids
what states are non-metal dioxides?
gas
what is the chemical and word equation for the combustion of magnesium?
• magnesium + oxygen -> magnesium oxide • 2Mg + O2 -> 2MgO
observations for the combustion of magnesium?
bright white light formed and white powder formed
what is the word and chemical equation for the combustion of sulphur?
-sulphur + oxygen -> sulphur dioxide -S + O2 -> SO2
what are the observations for the combustion of sulphur?
blue flame
what is the word equation and symbol equation for the combustion of hydrogen?
-hydrogen + oxygen -> water -2H2 + O2 -> 2H2O
what observations are there with the combustion of hydrogen?
squeaky pop
iron(II)?
Fe 2+
iron (III)?
Fe 3+
copper?
Cu 2+
silver?
Ag+
zinc?
Zn2+
lead?
Pb 2+
what is the chemical test for oxygen?
relights a glowing splint
metal oxides form what kind of solutions?
alkaline
non-metal dioxides form what kind of solutions?
acidic
how do you dissolve a metal oxide?
-combust it in oxygen -dissolve the oxide formed -check the pH of the solution formed with indicator