gases in reactions Flashcards
page 39
when and element is burnt in air it reacts with oxygen to form an …?
oxide
what coloured flame does magnesium produce?
bright white flame
What is the white powder formed from burning magnesium called?
magnesium oxide
when dissolved in water, is magnesium oxide slightly ACIDIC or ALKALINE
alkaline
how does hydrogen burn with oxygen?
very easily, in fact it can be explosive
what coloured flame does hydrogen produce?
an almost invisible light blue flame
what is the only product of burned hydrogen
water (as water vapour)
what test is the combustion of hydrogen often used as?
a test for hydrogen gas (squeaky pop test)
what coloured flame does sulfur produce?
a pale blue flame
what is the product of burned sulfur?
sulfur dioxide
when dissolved in water, is sulfur dioxide ACIDIC or ALKALINE
acidic
when you heat a metal carbonate you get ..?
carbon dioxide and a metal oxide
what is thermal decomposition?
when a substance breaks down into simpler substances when heated.
copper carbonate is a green powder that will easily decompose to form …. and ….. when you heat it
carbon dioxide and copper oxide
to do the experiment for the thermal decomposition of copper carbonate what do you do?
you collect the gas that’s given off in a test tube and test it to see if it is CO2. (turns limewater cloudy)
