2. COMBUSTION OR BURNING
What is it?
Wood
combustion
During wood
combustion, fuel
turns into heat,
ashes and smoke.
ExamplesHow does it
work?
Oil
combustion
During oil
combustion, fuel
turns into kinetic
energy and gases.
It is a chemical
reaction because a
new substance is
produced/created.
In combustion,
oxygen REACTS
with a FUEL. This
fuel can be : wood or
oil.
3. Ashes.
Coal.
Smoke.
Movement (kinetic energy) and gases.
At the beginning we have
wood. When wood reacts with
oxyen, it turns into:
At the beginning we have oil. When oil
reacts with oxyen, it turns into:
4. OXIDATION
What is it? ExamplesHow does it
work?
Food oxidation
It is a chemical
reaction because
a new substance
is produced.
In oxidation, oxygen
reacts with a substance
when the substance is
exposed to air. It
happens in iron, foods,
etc.
Iron oxidation
During iron
oxidation, the new
substance that we
get is called
RUST.
During food
oxidation, the
oxygen turns the
food brown.
5. At the beginning we have an
iron key. When iron reacts with
oxygen, it turns into:
Rust
At the beginning we have a green apple.
When we bite it, it reacts with oxygen... And it becomes an oxidized apple.
6. FERMENTATION
What is it? ExamplesHow does it
work?
Fermentation
in drinksIt is a chemical
reaction because
FUNGI and
BACTERIA change
organic substances
into other substances.
Fermentation
in foods
Fungi
produce
alcohol.
Bacteria
produce
lactic acid.
Natural
fermentation
Fermentation
to preserve
foods
