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What are elements ?
An element is a pure substance containing atoms with same proton number
State a fact about the properties of elements !
Each element has unique sets of properties
Can an element be broken down ?
An element cannot be broken down physically or chemically into any
simpler substances
How are elements represented
By symbols
What are the ways elements can exist ?
As a diatomic element or mono atomic element
What are 3 examples of elements ?
Hydrogen
Carbon
Oxygen
What are compounds?
A pure substance made up of atoms of different elements chemically
combined together
Can compounds be broken down?
Yes the can be broken down by chemical methods such as electrolysis and
decomposition
How are compounds represented ?
It is represented by a chemical formula
State a fact about the properties of a compound
, Since it an entirely new substance it often has totally new set of properties
What are molecules?
Molecules are large particles formed by the chemical combination of two or
more atoms
A molecule can be an element or a compound
What are mixtures ?
A mixture is made up of two or more elements or compounds physically
combined together
What are the 2 types of mixtures? Define them !
Homogenous mixtures - its where substances are totally mixed together
Heterogenous mixtures - its where substances remain sperate and one
substance is spread throughout the other as bubbles or droplets
What are the differences between mixtures and compounds?
MIXTURES COMPOUNDS
COMPOSITION No fixed composition Fixed composition . The percentage
each element in a particular compo
the same
,PROPERTIES A mixture does not have A compound has its own set of prop
its own set of properties not those of the elements
but the same properties as
the substance its made up
of
MELTING AND BOILING Not fixed at a constant Fixed at a constant temperature
POINT temperature
PREPERATION No chemical reaction A chemical reaction takes place wh
takes place in its formation formed from its elements
SEPERATION Can be seperated by Cannot be seperated by physical m
physical mean chemical means re required
, What are diatomic molecules ?
Elements that exist as 2 atoms
What are monoatomic molecules ?
Elements that exists as 1 atom
What atoms are diatomic?
Except group 8 elements all atoms are diatomic molecules
ATOMIC STRUCTURE
What are atoms ?
Building blocks of all matter
What are the subatomic particles of an atom?
Protons
Neutrons
Electrons
What is the nucleus of an atom?
It is where protons and neutrons are located at the center on an atom
What are shells of an atoms?
It is where the electrons of an atom moves very fast around the nucleus in
orbital paths
How is mass of an atom determined ?
By the number of subatomic particles in an atoms nucleus
How is the atomic number of an atom determined?
Atomic number is the proton number
What is the unit for an atoms mass?
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