Topic 4- Inorganic chemistry Flashcards
(21 cards)
What subshell is used to represent group 2 elements
s2 subshell
What happens to the atomic radius as you go down group 2 and why
atomic radius increases becuase more electron shells are added
what happens to the melting point as you go down group 2
Down the group, the melting point decreases.
why does the melting point of the group 2 elements decrease as you go down the group?
less energy is needed to break the metallic bonds as the delocalised electrons are further away from the positive nuclei because of an increased ionic radius
what affects the melting point of a group 2 atom
the arrangement of group two ions
what happens to the first ionization energy as you move down group two
the first ionization energy of the elements decreases
why does the first ionization energy decrease as you go down group 2
More electron shells are added as you move down group 2 which means that the atomic radius increases and therefore the outer most shell goes further away from the nucleus
what is the reactivity trend down group 2
as you move down group two, the reactivity increases.
what happens to the reactivity of group 2 elements as the first ionization energy decreases down the group
less energy is required to move the electrons, therefore the elements become more reactive.
what is the result of the flame test for magnesium?
white
what is the result of the flame test for beryllium?
white
what is the result of the flame test for calcium?
brick red
what is the result of the flame test for strontium?
scarlett
what is the result of the flame test for barium?
appel-green
Explain how to carry out the flame test
- A platnum or nichrome wire is dipped into hydrochloric acid
- The end of the wire with the solid sample on it is held into the bunsen burner flame
how do group 2 elements react with cold water and what is produced when they react
they react readily with cold water and produce a metal hydroxide and hydrogen
what happens when to the rate of reactivity with water as you go down group 2
the rate of reactivity with water of the elements increases as you move down the group
how do group 2 metals react with steam
group 2 metals react vigorously with steam to produce a metal hydroxide
how do group 2 elements form weakly alkaline solutions
the metal hydroxide dissolves in water to give an excess of OH- ions, which increases the pH of the solution
how do group 2 elements react with acids
group 2 elements react readily with dilute acids to form a salt and hydrogen
