chem yr 9 Flashcards
what is an electron
travels around nucleus
what is an nucleus
the center of the atom it is very small
what are protons and neurons
can be found in the nucleus
how much relitive charge does proton have
1
how much relivive charge do netrons have
0
how much relitive mass do protons have
1
how much relative chrge does electrons have
-1
how much relitive mass do netrons have
1
electrons relitive mass
verry small
what are pure substances
they have electrons and compounds and all the particles are the same
what are impure substances
have mixture and particles are different from each other
what is a compound
2 or more types of atoms that cant be separated
what is a mixture
2 or more types of atoms that can be separated
what is a element
contains only 1type of attom
what is a solvent
the liquid a solute is dissolved in
what is a solute
a substance that is dissolved in a solvent to form a solution
soluble
a solid that can dissolve in a solvent
insoluble
a solid cant dissolve in a solvent
whats eveperation
when a liquid turns into gass
what is condensing
evaporating solvent from solute
whats filtration
separates solvent from solute
where does the weight of the attom come from
protons and neutrons
properties of diamond
very high boiling and melting point
cant conduct electricity because theres no free electron
properties of graphite
very high boiling and melting point
can conduct electricity as it has 1 free electron
properties of graphene
has high boiling and melting point
can conduct electricity because there are free electrons
How are covalent bonds formed
By atoms sharing electrons
What’s an ion
An atom that has lost or gained electrons
What charges do ions from group 1 and 2 form
In group 1 they form +1and group 2 forms +2
What charges do ions from group 6 and 7 form
Group 6 forms 2- and group 7 forms 1-
What does a delocalised electron mean
An electron in an ion molecule or single mettle that which are not associated with a single atom or covalent bond
How is the periodic table orderd
By atomic number
How were the early lists of elements ordered
Atomic mass
What name is group 1
Alkali metals
Why is group 1 called that
They are metals that react with water to form an alkali
What is group is 7 called
Halogens
What are group 0
Noble gasses
How does melting point for the halogens change Down the group
Increases
What’s an exothermic transfer
Transfer to the sorounding
What’s an endothermic transfer
Transfer from the sorounding
What’s an exothermic reation
A chemical reaction that releases energy
What’s an endothermic reaction
A chemical reaction that takes in energy
What is relitive mas
The average mass of all the atoms of an element
What’s an attom
The smallest part of an element that can exist
How can u find out the number of protons in an atom
The atomic number on the periodic table
How can u find out the number of netrons
Mass number - the atomic number
