You can write down what you found out and
try other liquids - but check with an adult first if its OK! Please
read the important reminder below!
The bubbles are carbon dioxide gas created
by a chemical reaction (a chemical reaction is a process in which one
substance is chemically converted to another - all chemical reactions
involve the formation or destruction of bonds between atoms).
Carbon dioxide is the same gas we breath
out, and the gas plants need to make their own food. Carbon dioxide gas
is used in fire extinguishers to put out fires.
You might be surprised to learn that your
stomach contains a very powerful acid, called Hydrochloric Acid (HCl).
Your body uses this to help dissolve and breakdown food into very small
particles so your body can use it. See if you can find out why it
doesn't dissolve you!
HOW CHEMISTS TEST FOR ACIDS
Another way to test liquids is to use Litmus
Paper. BLUE coloured Litmus
Acids are dangerous chemicals
because they can make things dissolve and fizz. There is another type
of liquid called an alkali (or base) that is an acid
opposite. It can react with things too and is dangerous.
We say alkali's (bases) are acid opposites
because they make RED coloured
litmus turn BLUE. Also if we mix
an acid (harmful) and an alkali (harmful), we don't get a mixture that
is twice as harmful, we get plain old salty water! They are opposites
so cancel each other out to form salty water!
This process is called neutralisation.
The salty water is not an acid, not an alkali, it is neutral.
An even better way to test liquids to see
if they are acid, alkali or neutral is to use a colored dye called Universal
Indicator. Universal Indicator is RED
in acid, GREEN
in neutral solutions, PURPLE in
Usually in science experiments the sense
of taste is the one we don't use! Many chemicals look like
water but are very poisonous if you accidently drink them.
NEVER TASTE CHEMICALS TO SEE WHAT THEY
ALWAYS ASK AN ADULT FOR HELP WHEN
CARRYING OUT CHEMISTRY EXPERIMENTS.