Labcast1

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SCIENCE BLOG!
By three year 7 students
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PARTICLES!
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How do particles affect the density of
different blocks?
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Introduction
We are testing how particles affect the weight,
or density, of different blocks. We will do this
by weighing 5 different blocks that are the same
size and testing the difference between the mass.
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Prediction
We predict that they will have a different mass
because of the particles. In different blocks,
more particles are packed together in a solid,
making that block heavier. Or vice versa, with
less particles packed together not so tight. The
particles of different materials have atoms with
different numbers of protons, neutrons and
electrons.
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Results
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Graph
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Conclusion
We found out that some blocks have less mass than
others because the particles are packed in a
different density. All materials are made from
tiny particles called atoms. In different blocks,
more particles are packed together in a solid,
making that block have a greater mass.
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What happens when Potassium Permanganate
dissolves in water?
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Introduction
For this experiment we are going to find out if
potassium permanganate will dissolve faster in
hot rather than cold water. We are also finding
out if the particles in water are always moving.
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Prediction
We predict that the potassium permanganate will
dissolve faster in the hot water because hot
water has more heat energy than cold water and
will carry the atoms of the permanganate faster.
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Our results for this experiment are visual, not
in a table. We could see a slight difference
between the hot water and the cold water, as the
particles spread a little quicker in the hot
water.
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Conclusion
From this experiment, we can conclude that our
prediction was correct and that some particles in
the water must be in continuous motion.
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Does the thickness of the rod affect the speed
of the travelling heat?
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Introduction
We are trying to find out if the thickness of the
rod affects the travelling time of the heated
particles. We will do this by heating up a metal
rod with paper clips stuck on with Vaseline. We
are measuring the speed it takes to make all of
the paper clips fall off the metal rod.
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We predict that a thinner rod will allow the heat
to travel quicker than a thick rod because the
thin rod will have less particles to heat. When
particles heat, they gain extra energy and start
to move rapidly. This movement (heat) spreads up
the metal rod, a conductor, and melts the
Vaseline.
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Results
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Graph
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Conclusion
We found out that our conclusion was correct
because the particles travelled faster in the
thin rod and the thick rod took an extremely long
time to over four minutes!
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Extra slide from teacher!

• The thicker rods contain more particles. This
  means there are more particles to conduct the
  heat through the rod. A thicker rod should
  conduct the heat faster. However, its important
  to check that all three rods are made of the same
  metal.

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How long does it take for smell to travel from
arms length?
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Introduction
In this test we are investigating how long it
takes a human nose to pick up a scent from arms
length. This involves particles because the time
taken depends on the rapidity of the moving
particles. In a windless environment, It may take
longer than one with a wind in your favour.
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We predict that it will take quite a while for
the scent to reach one of our noses. This is
because the scent is in a big room and it might
take a longer time for the particles to travel.
One of our group says that it depends on the size
of the room. If it was a small room, it wouldnt
take as long to travel because the scent is not
directed to your nose, the particles also travel
the space of the room.
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To be continued...