everything known in science (universe) matter has mass ( measure of how much) has volume (takes up...
TRANSCRIPT
Everything known in Science
(Universe)
Matter
• has mass ( measure of how much)
• has volume (takes up space)
Energy
•cause change / do work
Matter - always built from Atoms
Atoms – smallest complete units of matter
Atoms - made of 3 smaller (subatomic) particles• Protons• Neutrons• Electrons
Nucleus = center
Helium atom
Periodic table of the ElementsDifferent atoms become the foundation for different elements
Periodic table of Elements?
Element = a pure collection of the exact same type of atoms.
Elements or Atoms?
Pure = only one type of atom is present
Because they are built on the smallest whole unit of matter…the atom…Elements cannot be broken down into different simpler substances !!!!
What is the symbol that represents the element Carbon?
The capital letter ‘C’
What is the symbol that represents the element Helium?
The capital letter ‘H’ followed by a lowercase ‘e’
The symbol for an element will ALWAYS START WITH A CAPITAL letterand…it will have only ONE capital letter…(it may have a lower case letter).
Is this a model for an Element?
No…it’s got more than one type of atom
This is the compound - H2O
Compounds = two or more elementsthat are chemically bonded together
Because the different types atoms are chemically bonded…Compounds are NOT MIXTURES!
The properties of a compound are different than those of the element from with they are formed.
EX: Hydrogen an explosive gas…Oxygen a clear gas that supports combustion.H2O – clear liquid that puts out fire!
This model for has lines to helpshow that the elements H and O are chemically bonded together.
Think of these bonds as the energy bonds required to hold the elements together.
Compounds have more than one element chemically bonded by energy…
so…how many capital letters must be in their formula????
H2O NaClNaCl
TWO OR MORE !H2O C12H22O11
Can a compound be pure?
Sure…as long as only that compound is present.
If it’s all H2O…it’s pure
Elements are represented by SYMBOLS.
They always Start w/capital & have only one capital.
EX: O = Oxygen
Fe = Iron
Because they are made from one type of atom…Elements cannot be broken down into different simpler substances !!!!
Compounds are represented by FORMULAS
The formula is a recipe that shows what elements are chemically bonded together in the compound.
EX: H2O = 2 Hydrogen bonded with 1 oxygen
CO2 = 1 Carbon bonded with 2 oxygen.
Because they are made from two or more types of atoms….compound can be broken into simpler substances.
Summary – Element vs. Compound
Which is an element?Which is a compound?
A BA = Element
One type of atomB = CompoundMore than onetype of element
Which is pure?
A B
Both !
Are these containers pure?
A BNO !