Periodic Table Groups And Reactivity Flashcards
Two physical properties of alkali metals (that are not properties of typical metals)
Density - alkali metals have low density (they float).
Soft - able to cut with a knife
Why are group 1 metals stored in oil?
To make sure they don’t react with oxygen and hydrogen in the air.
Word equation format for alkali metals reacting with water
Metal + water —> metal hydroxide + hydrogen
Magnesium + water —> magnesium hydroxide + hydrogen
Symbol equation format for alkali metals reacting with water
2Mg + 2H2O —> 2MgOH +H2
The relationship between the reactivity and the electronic configuration of Group 1 metals
The greater the distance of the outer shell electron from the nucleus, the less attraction between the positive nucleus and the negative electrons therefore the easier for the outer electron to leave and the greater the reactivity.
Four main gases in dry air
Oxygen - 21%
Nitrogen - 78%
Argon - 0.9%
Carbon dioxide - 0.040%
Four main gases in dry air
Oxygen - 21%
Nitrogen - 78%
Argon - 1%
Carbon dioxide - 0.040%
The green house effect
The sun radiates infa red
Some gases go into the atmosphere
The energy is absorbed by CO2 causing bond vibrations
The CO2 molecules trap infa red/heat energy in the atmosphere
Excess CO2 results in Global warming/ climate change
Thermal decomposition
Chemical decomposition which was caused by heat
To collect gas
Downward displacement
Gas syringe
With density:
Upward delivery
Downward delivery
Combustion
Substances reacting with oxygen to produce heat and light
Flourine
Gas
Low melting point
Colorless
Chlorine
Gas
Low melting point
Pale yellow
Bromine
Liquid
Medium melting point
Dark red
Iodine
Solid
High melting point
Grey
