Grouping Materials
Ø Every
one of you uses pencil. Do you know from which material pencil is made
up of?
(wood/plastic/metal and graphite)
Ø What
is meant by material?
material
is anything made of matter,constituting one or more substances.
Ø Did
you find the eraser easily from the bowl?
(no)
Ø Why
you can’t find eraser easily from the bowl?
(because
so many different things are there along with eraser)
Ø Did
you find the eraser easily from the table? Why?
(yes, as
all the objects are grouped/organised on the table, it was easier to pick up
the required material)
Ø What
is the difference between these two diagrams?
(shape of the circle and triangle are
different)
objects or
materials are arranged on the basis of their similarities or differences. Such arrangement
is known as classification.
Ø How
can you differentiate between a solid and liquid material?
Ø What
is the difference between solid and gases?
(gases
have neither shape nor volume whereas solids have a definite shape and volume)
Ø In
which state of matter, particles are loosely packed?
(gases)
Ø Which
state of matter does ‘oxygen’ belongs to?
(gases)
Ø What
is meant by material?
(material
is anything made of matter, constituting one or more substances)
Ø Which
state of matter has a definite shape and volume?
(solid)
Ø Which
state of matter neither has a definite shape nor definite volume?
(gases)
Ø Which
of the two objects is smoother to touch?
(marble)
Ø Which
of the two objects is rough to touch?
(piece of wood)
Ø Which
of the object shines?
(gold ring)
Ø Which
of the two objects is compressible?
(cotton)
Ø Which
of the two objects is not compressible?
(stone)
Ø What
is meant by lustre?
(a gentle
sheen or a soft glow possessed by a material is known as lustre)
Ø What
will happen, when you add sugar in water?
(the sugar will dissolve in water)
ü soluble
substances- sugar, washing soda
ü insoluble
substances- plastic ball, wooden shavings)
Ø Give
two examples of insoluble substances.
(sand,
glass)
Ø When
kerosene is added to the test tube containing water. Will it float or sink
in the
water?
(it will float on water)
Ø When
you throw a stone in a pond. Will it float on water?
(no)
Ø Can
you see an object kept behind a wooden door?
(no)
Ø Can
you see an object kept behind a glass sheet?
(yes)
some
materials like plastic do not allow light to pass through them and are known as
opaque substances
Such
materials are nether transparent not opaque and are known as semitransparent or
translucent materials
