The document discusses effervescence, which is when gas bubbles form from a chemical reaction in a liquid. Specifically, it defines effervescence, notes that the most common gas released is carbon dioxide, and provides examples like carbonated drinks where carbon dioxide dissolved in water under pressure causes bubbles. It then describes an experiment where dropping an Alka-Seltzer tablet into water causes effervescence as the chemical reaction releases carbon dioxide bubbles.

1. Areej Arif
roll n0 # 07

2. EFFERVESCENCE

3. EFFERVESCENCE
 The term comes from the Latin verb fervere, which means "to
boil."
 In chemistry, effervescence is when gas bubbles form from a
chemical reaction in a liquid substance.
 The most common gas released in effervescence is carbon
dioxide; however nitrogen gas may be dissolved in liquids to
produce smaller bubbles

4. EXAMPLES OF
EFFERVESCENCE
Carbonated water has absorbed
carbon dioxide, which produces
effervescence. The bubbles in
fizzy drinks are caused by carbon
dioxide (CO2). Carbon dioxide is
a colorless odorless gas that
dissolves in water under pressure.
Common examples of
effervescence include bubbles
and foam from cold drink, and
carbonated soft drinks.

5. MATERIAL
 Empty peanut butter jar and screw
on lid
 Alka-Seltzer tablets
 Roll of paper towels for cleanup
 Half glass of water
 Watch with second hand

6. Put an Alka-Seltzer tablet in the
water. After the tablet dissolves in
the clear jar, observe the size and
number of bubbles within the
water. Shake the jar energetically.
The chemical reaction began when
the sodium bicarbonate tablet
mixed with water. The chemical
reaction released carbon dioxide.
The gas was contained in the
bubbles seen in the water.