Atoms and molecules ppt presentation for grade 7 matatag lesson 2

1. ATOMS AND
MOLECULES

2. ATOM VS MOLECULE
https://examples.yourdictionary.com/basic-difference-between-an-atom-and-a-molecule.html

3. ATOMS VS MOLECULES
An ATOM is the smallest unit of
matter. It’s composed of different
particles called electrons,
protons, and neutrons.

4. ATOMS VS MOLECULE
A MOLECULE is made up of atoms
bonded together. So, while an atom is its
own separate entity, a molecule is what
you get when those atoms bond
together.

5. EFFECT OF TEMPERATURE TO
ATOMS AND MOLECULES
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/temper.html

6. CHANGES IN MATTER

7. MELTING (FUSION)
When a solid is heated, the motion of the particles
increases.
The atoms or molecules remain attracted to one
another, but their movements, which are enhanced
by the added energy, allow the particles to weaken
the attractive forces between them.

8. MELTING (FUSION)
They begin to slide past one another as the
substance begins change its state from solid
to liquid.
The temperature at which a substance
begins to melt is its melting point.

9. FREEZING (SOLIDIFICATION)
When a liquid is cooled, the movement of particles
slow down, and the attractive forces between
particles strengthen, resulting in increased closeness.
When this happens, the particles settle in more fixed
and orderly positions, and the liquid turns into a
solid.

10. EVAPORATION
The atoms or molecules in a
liquid evaporate when the energy
is sufficient for them to overcome
the attractions between particles.
Evaporation takes place when the
particles rise in air as gas.

11. EVAPORATION
Higher temperatures speed up
evaporation.
The motion of particles increases
when the liquid is heated.

12. CONDENSATION
The change of phase from the
gas state to the liquid state
Cooling or lowering the
temperature of water vapor
increases its rate of
condensation.

13. SUBLIMATION
Some substances can change
directly from solid to gas.
Transition from solid to gas
without passing through the liquid
phase, often with formation of a
solid deposit again on cooling.

14. DEPOSITION
With the right concentration
of particles and at the right
temperature, a gas can
change directly to a solid
without going through the
liquid phase.

15. DEPOSITION
One common example
of deposition is the
formation of frost,
which is water vapor
that turn into ice.

16. ESSAY: Read the question below and
explain in 3-4 sentences.
Certain frozen products are allowed to dry
through rapid freezing and then sublimation
in a vacuum chamber. These are called
freeze-dried products. Why do freeze-dried
products need to be refrigerated afterward?