Topic 6 Flashcards
(26 cards)
what metals are in group 1
alkali
what happens to alkali metals when they react with water
they form a metal hydroxide and hydrogen
what colour are the hydroxides formed from alkali metals and water
colourless
characteristics of alkali metals
soft metals which can be easily cut with a knife
low densities and melting points
very reactive as only need to lose one electron
reactivity trend in group 1
reactivity increases as you go down the group
lithium is the least reactive
as you go down group one configuration
the number of elcectron shells increases by 1
this means the outer most shell is further away from the nucleus and less energy is required to overcome the force of reaction so the electron is lost more easily
physical properties of group seven
melting and boiling point increases as you go down the group
poisonous
reactivity decreases as you go down the group
fluorine
yellow gas
chlorine
yellow gas
bromine
red brown liquid
iodine
purple black solid
test for chlorine
damp blue litmus paper is bleached white
halogen displacement reactions occur when
a more reactive halogen displaces a less reactive halogen from an aqueous solution of its hallide
chlorine will displace
bromine or iodine
bromine will displace
iodine
when halogens form a full outer shell they become
negative ions
trends in nobel gases
increase in boiling point as they move down the group
melting and boiling points in noble gases
very low
noble gases density trend
increases as you go down the group
way to measure rate of reactions
change in mass
volume of gas
dissaperring cross experiment
calculating rates of reactions
reactant used of product formed = rate of reaction x time takren
how do catalysts work
by lowering the activation energy required hence providing a pathway requiring less energy
what reactions are combustion, oxidation and neau
exothermic
endothermic reaction
when more energy is required to make the bonds then break them
