SCIENCE UNIT 1

WHAT'S MATTER?

• - Matter has dimensions:
• - volume
• - space
• - Matter has inertia: It's the resistance of an object to change its state of motion
• - Matter causes gravitation
• - Higher mass, higher gravitation.

MASS AND DENSITY

• MASS: iT'S THE MEASURMENT OF THE QUANTITY OF MATTER
• DENSITY: IT'S THE RELATIONSHIP BETWEEN THE MASS AND THE VOLUME OF A SUBSTANCE
• density = mass
• volume

ATOMS

• Atom means Indivisible in Greek.
• Atoms are made of: - Electrons (negtive)
• - Neutrons (none)
• - Protons (positive)
• Neutral electrons have no change (number of electrons = number of protons)

IONS AND MOLECULES

• An ion is an atom or a molecule in which the total number of electrons is not equal to the total number of protons,
• Gain -e: neagtive ins
• Loose -e: psitive ions
• MOLCULES: Group of atoms together. Elements: same type
• Compounds: different type