Atoms, Elements, Molecules, Compounds
— ATOMS are the basic building blocks of matter.
—Atoms are composed of particles called protons, electrons and neutrons.
and neutrons carry no electrical charge at all. The protons and neutrons cluster together
in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.
—— An ELEMENT is a pure substance that cannot be separated into simpler
substance by physical or chemical means.
— A
MOLECULE is formed when two or more atoms join together chemically. (they can
have 2 of the same elements)
— A
COMPOUND is a molecule that contains at least two different elements.
— All
compounds are molecules but not all molecules are compounds.
— Molecular
hydrogen (H2), molecular oxygen (O2) and molecular nitrogen
(N2) are not compounds because each is composed of a single element.
— Water
(H2O), carbon dioxide (CO2) and methane (CH4) are
compounds because each is made from more than one elements.
What Elements are we made up of?
—Most
of the human body is made up of
water, H2O.
—Most
of a human body's mass is oxygen.
—Carbon,
the basic unit for organic molecules,
comes in second.
—99%
of the mass of the human body is made up of just six elements: oxygen, carbon,
hydrogen, nitrogen, calcium, and phosphorus.
How do atoms combine to make compounds? Chemical Bonding
Chemical Bonds, Chemical Bonds, Chemical Bonds!
Click here to see the powerpoint.
CH4
Chemical Bonds, Chemical Bonds, Chemical Bonds!
Click here to see the powerpoint.
CH4
They are mineral in nature.
They are biological in nature (bio=living
Click here to for Compounds Class Worksheet
Four types of organic compounds are important in living systems.Carbohydrates, Lipids, Proteins & Nucleic acids
Click Here to find out more!
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