give the word equation when a group 1 metal reacts with water
metal + water –> metal hydroxide + hydrogen
why is group 1 called ‘alkali metals’?
because when these metals react with water, they leave behind alkaline solutions
what happens to reactivicty as you go down group 1?
increases
whats the trend in metling points as you go down group 1?
decreases
when group 1 metals reacts, what happens the the group 1 metal atoms in the terms of electrons? [2 points]
- loses its outer electron
- which forms a 1+ ion
where to the electrons go after a group 1 metals has reacted?
to the OH group
OR
transferred to the substance reacted with
which group 1 metals float on water? [3 points]
Li, Na, K
list 3 physical properties of group 1 metals
3 ftf:
- soft
- low density
- low mp and bp
- good conductors (of heat and electricity)
- very reactive (have to be stored in oil)
- ductile
what is the name of group 1 metals?
Alkali metals
why are the metals hydroxides alkali?
becuse they donate OH- ions
what happens when K reacts with water? [why and explanation]
lilac flame produced
beause of hydrogen produced
when you react group 1 metals with water, what happens as you go down the group?
they get more explosive
give the word equation for when you react a group 1 metal with chlorine:
metal + chlorine –> metal chloride
give the word equation for when you react a group 1 metal with oxygen:
metal + oxygen –> metal oxide
when you go down group 1, why do the atoms get mroe reactive? [4 points]
- the atoms get bigger and have more shells
- the outer-electron is further from the nucleus
- the attraction between the nucleus and the outer-electron is weaker
- so less energy is needed to break the attraction.
what colour would universal indicator be when added to a group 1 metal solution? and why?
blue or purple
because group 1 metals, when dissolved in water, donate OH- ions
what is the trend in reactivity as you go down group 1
increases (as you go down the group)
why does group reacivity increase as you go down group 1 [5 points]
- atoms get bigger and have more shells
- outer electron is further from nucleus
- attraction between nucleus and outer electron is weaker
so less energy needed to break/overcome the attraction
what liquid are group 1 metals stored in
oil
are group 1 metals soft or hard
soft
give the 3 group 1 elements that float on water
Li, Na, K
when group 1 elements react, what happesn to the group 1 metal atoms in terms of electrons? [2 points]
loses outer electron [1] to form 1+ ion [2]
where do the electrons that gorup 1 metals lose go? (when reacted)
lost to the substance reacted with
OR
lost to the OH group
OR OH ions gain them
what type of compound is formed when group 1 metal atoms react with other substances?
ionic
