Reaction And The Periodic Table Flashcards
What happen when group II metal react with oxygen
Metals burn in air and even more rapidly in oxygen and when descending the group. The reaction are similar, forming the metal oxide.
What happen when group two metal react with water
Reactivity increase down the group
Magnesium reacts slowly with cold water.
Hot magnesium react with , steam to form magnesium oxide
Calcium react more rapidly with water than magnesium
What happens when group two metals react with hydrochloride acid
It forms hydrogen and salt called Chlorides. The reaction are similar increasing down the group.
What is the reactivity and ease of lionization
It is the reactivity of group two metal which is linked to the ease with which they forms ions. When they react their atoms loose two outmost electron to form ions.
The energy that is needed to remove an electron from an atom or ion is called the ionization energy.also down the group the energy needed to remove the two electrons decrease.
What are the three things that influence the energy required to remove an electron.
Distance of outer electron from the nucleus, the further the outer electron ‘ are from nucleus the smaller The attraction to the nucleus are and the lower the energy to needed move the outer electron.
Nucleus charge the greater number of proton in the nucleus the more energy requiredto remove the outer electron.
Inner electron shell reduces the amount of inner charge felt by the outer electrons. This is called shielding or screening. The greater the number of inner shell the lower energy needed to remove the outer electrons.
What are group VII elements called and what do they do.
Group VII elements are called halogens.they all exist as diatomic
molecules. This means that they have molecules made up of atoms.
The colorget darker and moves intense down the group.
Bromine vapor is red-brown iodine but iodine vapor is purple and a solution of lodione in a aqueous potassium iodine is brown
The Melting points and boiling point increase down the group.
What is displacement reaction and an example
Displacement reaction is which one type of atom or ion has replaced in a compound.
When an aqueous solution of chlorine(solution of chlorine in water)is added to aqueous potassium bromide the chlorine displace the bromide ion in the potassium bromide.
By adding different halides we can see that a halogen higher in the group has displaced the halogen lower in the group from halide solution.
Explain what is displacement reactions
The halogen get less reactive going down group VII. this is because of different in the oxidizing power or halogen.
Key points as we go down the group:
The radius of the halogen atom increase
The oxidizing ability of the halogen decrease A halogen higher in the group is a better oxidizing agent than one lower down.
The oxidizing ability decrease like this because it is more difficult to add an electron to an halogen atom a negative if halogen atom is larger.
A stronger oxidizing agent will accept electrons from a weak oxidizin agent.
Chlorine (Strong oxidizing agent - better electron acceptor) will displace bromine from a bromicle.
Bromine(weak oxidizing agent- was ser electron acceptor ) will not displace bromine from a chloride.
