Chemical Changes Flashcards
Elements
Pure substance containing one type of atom
Elements can be seperated into
metals and non metals
Chemical Symbol
Abbreviation of an elements name
Compounds
are pure substances containing the one type of molecule.
molecules must contain atleast two different elements
Decomposition
Breaking a compund down into simpler substances
who devised the Periodic table
Mendeleev
Periodic table notes
an element position on the periodical table indicates its chemical properties
Group Numbers
Horizontal rows of an elements are called
periods
indicates the number of electron shells
eg:
period three has 3 electrons
electrons
negative charge
protons
positive charge
neutrons
neutral
knowledge of atom structure was gradually built from the contributions of many scientists over time
Dalton,Faraday,Thompson,Bohr,Chadwick
Atomic Number
number of protons
Mass Number
number of protons + number of neutrons
atoms always have
equal numbers of electrons and protons
Ironic Compounds
form between metall atoms and non metal atoms
Metals have
1,2,3 outer shell(valence electrons) electrons
non metals have
5,6,7 or 8 outer shell electrons
ionic compund form when
metals donate their valence electrons to non- metal atoms
by doing this both metal and non metal atoms can achieve the stabe nuber of 8electrons in their outer electron shells
Ions
atoms that gain or lose electrons
Average Speed
m/s
Distance(M)
_________
Time (S)
Speed is also measured in
Km/H
measure Distance?
Tape Measure
Measure Time?
Stop Watch
Velocity
is speed in a specified direction
Ticker time
produces a series or patterns of dots on the paper strip pulled by the trolley
Inertia
This is the property of an object to resist a change in motion
Newton’s 1’st Law
property of inertia
example seatbealt
keep travelling
Pyramid distance time speed
D
____
S/T
Newton’s 2nd Law
mass of an object is kept constant then its acceleration is directly related to the force put on it
F=MxA
Newton’s 3rd Law
For every action force there is an equal but opposite in direction reaction force
> larger force the object will move that way
Who is Mica’s most most most favourite friend?
RUI OF COURSE!!! :D
Lies… its Eb ;)
Take a break
:D
Message your best friend
Now!!!!
Seatbelt -1st law
Seatbelt acts as unbalanced force which stops you from continuing at a constant speed through the windshield.
Calculating Acceleration
Acceleration= Change in speed/Time
Acceleration= Final speed(m/s) - Starting speed (m/s) / Time
(m/s)
