Chemistry triple stuff i need to know Flashcards
why is the table called a periodic table?
because similar properties occur at regular intervals
what was mendeleev and Newlands table put in?
atomic weight
group 1 properties
they react with non-metals to form a metal ion with a +! charge, these compounds are white solids that dissolve in water to form colourless solutions
they react with water and release hydrogen
they form hydroxides that dissolve in water to give an alkaline solution
transition elements in comparison with group 1
higher melting points except for mecury
higher densities
less reactive
do not react as vigoursly with water or oxygen
properties of transition elements
have ions with different charges
catalysts
form coloured compounds
what can a more reactive halogen do?
displace it from a aqueous solution of its salt
temporary soft water to soft water
contains hydrogencarbonate ions which decompose on heating to produce carbonate ions which react with the calcium and magnesium ions to form precipitates
In an exothermic reaction
THE ENERGY RELEASED FROM FORMING NEW BONDS IS GREATER THAN TEH ENERGY NEEDED TO BREAK EXSITING BONDS
in an endothermic reaction
THE ENERGY NEEDED TO BREAK EXSITING BONDS IS GREATER THAN THE ENERGY RELEASED WHEN NEW BONDS ARE FORMED
halide ions
halide ionsin solution produces a precipitate with silver nitrate solution in the presence of a dilute nitric acid
sulfate ions
in solution produce a white precipitate with barium chloride in the prescnece of dilute hydrochloric acid
alcohol properties
dissolve in water to form neutral solutions
react with sodium to form hydrogen
burn in air
carboxylic acid properties
dissolve in water to produce acidic soultions
react with carbonates to produce carbon dioxide
reacts with alcohols in the presence of an acid catalyst to produce esters
How do you work out concentration?
Moles/volume
How do you work out the number of moles?
Mass / rfm
