SCIENCE 7 - WEEK 2
WORKSHEET
DAY 1
Particle Model of Matter
The particle model of matter is a scientific theory that explains that all matter is made up of tiny particles,
These
particles are always in motion and have spaces between them. The arrangement
and movement of
these
particles determine the state of matter:
الشريف
Legund
⚫ Solids have particles that are tightly packed and vibrate in place, giving them
a fixed shape and volume.
• Liquids have particles that are close together but can move past each other,
allowing them to flow and take the shape of their container.
•Gases have particles that are far apart and move freely, filling the entire space
available.
This model helps us understand the properties of different materials and how they change state, such as melting, freezing,
evaporating.
Atomic Models
The particle model of matter explains that all matter is made up of tiny particles that are always moving. To understand wh
these particles are, scientists developed atomic models.
Atomic Models describe the structure of atoms, which are the smallest units of matter that retain the properties of an
element. Atoms are made up of three main components:
Protons: Positively charged particles found in the nucleus (center) of the atom.
Neutrons: Neutral particles also located in the nucleus.
Electrons: Negatively charged particles that orbit the nucleus in electron shells.
Understanding atomic models helps us see how the tiny particles described by the particle model are
structured at the atomic level. This connection between the particle model
and atomic models helps
us
explain the behavior and properties of different materials, such as how they bond to form
compounds
why they exhibit certain physical and chemical properties.
ACTIVITY 1: ATOMIC MODELS
Instructions: Match each atomic model or experiment (Column A) with its corresponding scientist (Co
Write your answers on your paper.
Column A
Plum Pudding Model
Nuclear Model/Gold Foil Experiment
etary Model
m Mechanical Model
here/ Billiard Ball
Column B
a. Ernest Rutherford
b. J.J Thomson
c. Neils Bohr
d. John Dalton
e. Erwin Schrodinger
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