Test by Fire
You will need: Candle, salt, copper sulfate, boric
When scientists are asked
to find out what certain substances arc composed of, they are said to analyze
One of the instruments they
may use is a spectroscope. This instrument records the colors of the flame a
substance produces when it burns, for each element produces a definite color of
You can prove this by
holding various chemicals over a candle flame with tongs.
Common household salt
should give off a yellow flame from the sodium which is present. Boric acid
will give a greenish flame from the boron which is present.
can obtain a crystal of copper sulfate from a druggist you will find that it
will produce a beautiful blue flame.
Children learn best through doing
Before children can
understand a thing, they need experience: seeing, touching, hearing, tasting,
smelling; choosing, arranging, putting things together, taking things apart.
Experimenting with real things.
Old-time school teaching
used only words and the teachers thought children knew something if they could
repeat it. Now we know better. To reach practical understanding we do not need
to use many words with young children.
clever. They learn a lot, without being taught. The greatest skill - to be able
to talk, to communicate is learnt outside school. In the classroom it's the
children who need to talk the most. Unfortunately it is the teacher who does
most of the talking!