Chemistry MCQS Flashcards
endothermic reactions
melting ice, evaporation, thermal decomposition of carbonates, photosynthesis , electrolysis, cooking
exothermic reactions
combustion, neutralization, nuclear fission, acid + metals, rusting of iron
which metals react with water
potassium, sodium, lithium,, calcium
which metals react with acids
all metals up til hydrogen
which metals react with oxygen
all excluding gold, silver and platinum
thermal decomposition exc. cases
group 1 elements and in nitartes they form nitrites
explain exothermic
energy absorbed in bond breaking is less than energy released in bond making
formation of acid rain
Many fossil fuels contain sulfur impurities. When these fuels are burned, the sulfur is oxidised to form sulfur dioxide.
S(s) + O2(g) → SO2(g)
This sulfur dioxide then dissolves in droplets of rainwater to form sulfurous acid.
What is terylene
A polyester
what happens to the temperature of the reaction media during an endothermic reaction?
temperature drops
trends in group 1
reacticity increases down the group
m.p and density decreases down the group
which is a use of oxygen
to react with methane in a bunsen burner
why is carbon monoxide considered to be a pollutant?
it is poisonous
does the reaction of an alkali with a carbonate produce CO2
no
how to write a polymer
poly(alkene)
NOT ALKANE
