introduction (3.1) Flashcards
qualities of a physical change
create no new substances
easy to reverse
obsorb/release small amounts of energy
qualities of a chemical change
new substance is created
difficult to reverse
large amounts of energy are released
example of physical change
melting ice
example of chemical change
burning wood
what is the chemical test for water
anhydrous copper sulphate
turns white to blue
what is the physical test for water
melting point (0^C)
boiling point (100^C)
purer water matched these properties
define an element
a substance containing ONLY one type of atom
what are elements categorised into?
metals and non metals
4 properties of a non metal
low MP/BP
electrical insulators
brittle
full
4 properties of a metal
high MP/BP
electrical conductors
malleable
shiny
what side of the periodic table are metals on
left hand side
what side of the periodic table are non metals on
right hand side
what elements are diatomic
hydrogen
nitrogen
oxygen
fluorine
chlorine
bromine
iodine
astatine
what number is by diatomic molecules
2
how to remember diatomic molecules
have no fear of ice cold beer
