Important Flashcards
When alkali metals react with water what is produced
An alkaline solution is produced/ a metal hydroxide , this has the symbol (aq)
Hydrogen is produced / hydrogen is a gas and is diatomic so bear that in mind when balancing equations
Potassium + water —> potassium hydroxide + hydrogen
When an alkali metal reacts with chlorine what is produced
A colourless crystalline salt is produced by an alkali metal as it reacts with chlorine
Lithium (solid) + chlorine (gas) —>lithium chloride (solid)
Chlorine is diatomic so bear this in mind while balancing
What are the colours of group 7 elements
Fluorine = yellow gas
Chlorine = green gas
Bromide = red / brown liquid
Iodine = grey soild / purple vapour
When alkali metals react with halogens they produce metal halides
Potassium + bromide = potassium bromide
The halogens react with iron to form coloured solids , known as iron halides
Iron + chlorine –> iron chloride
Remeber
A more reactive element displaces a less reactive element and it is the element that is pushed out of the colourles soloutions whose colours can be obserrved
Alkali metals
Alkali metals are stored in oil when removed from this soloution they tarnish quickly as their shiny surface reacts with oxygen and moisture in the air, they are handled only with dry equiptment and are not touched with bare skin as even dampness and sweat in the skin could ignite a reaction in the very reactive elements . They are kept away form skin as they are corrosive
Flames of alkali metals
Lithium - red flame
Sodium - yellow flame
Potassium Lilia flame
What is an ion
When an atom looses or gains an electron it becomes an ion .
If an atom looses an electron it becomes a positive ion as it has lost a negative charge
If an atone gains an electron it becomes a negative ion as it gains an negatively charged particle .
An atom works to become an ion in the hope of establishing a complete outer shell
What is an ionic compound
An ionic compound elements held together in compound by electrostatic forces of attractio
