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Tuesday, February 16, 2016
5 Easy Facts About website traffic.
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Thursday, August 21, 2014
The pH scale and soil testing.
The pH scale.
The pH scale measures
how acidic (or how alkaline) a substance is. Most of the substances which you handle in
the lab have pH values between t and 14. A substance with pH 1 is
very acidic. A substance with pH 14 is very alkaline. A substance with
pH7 is neutral.
Soil testing.
When the smart family arrived at their
new home, Fred looked at the garden, thought of his father, and shuddered.
The garden was
huge. His
father was a gardening fanatic who did everything just as the book said. That meant
lots of work for Fred!
Sunday, August 17, 2014
Acids and alkalies.
There are very many different
chemicals - so many that it’s impossible to
study them all. To make things simpler, scientists Put chemicals which behave
the same way into groups or sets. You Have already met the set
of metals. Acids and alkalis are two More of these chemical
sets.
You can find out if a substance is an acid, or an alkali, by dissolving it and adding
universal indicator. The diagram shows you how to do this.
The indicator's
colour changes if acid or alkali is added to it.
And so, by matching the indicator colour to a colour chart. you can find out what kind of substance has been added.
Saturday, August 16, 2014
Using un-reactive metals.
The two
nails in the photograph look very different' The top one has been taken straight
from the packet.
It is still shiny. The bottom one has been in acid for a week.
The acid has reacted with the iron in the nail and has started to eat it away. The nail
has rusted
or corroded.
A metal corrodes whenever a chemical attacks
its surface. Water, air, and acid are three of the most common corroding chemicals.
The fuel of the future.
That's the claim made by a number of scientists. They think that
hydrogen is such a good fuel that ii will one day replace all of the fuels used
at present. Could the scientists be correct. Judge for yourself as you read on.
A good fuel should produce
large amounts of heat when it burns.
Heat energy is measured in kilo-joules’ (kJ). Burning 1g of hydrogen produces 143
k] of heat, enough to boil a large cupful of water. (Burning 1 g of petrol produces
48 kJ. Burning 1 g of natural gas produces 58 k).
A good fuel should be cheap and
easy to produce. There is a very
small amount of hydrogen gas in the atmosphere, but it
Cannot be easily separated from other gases.
A useful fuel.
Mixtures of hydrogen and air
can explode when they are it. But if hydrogen is mixed
with the correct amount of air, it burns with a hot, clean flame. a hot,
Hydrogen is a very useful fuel.Homes and factories can be heated with the help of hydrogen. For many years, British homes and factories were supplied with town gas,
containing ৫0% hydrogen. It was made at the local gas works, by heating coke (carbon) with steam.
Hydrogen, metal,acids and alkali's.
Hydrogen gas,
a metal
and an acid
all had a part to play in the successful flight of this pioneer
balloon. The hydrogen was used to fill the balloon skin and so keep the balloon in the air. The metal and the acid were both used to make the hydrogen. It was made in A barrel by mixing iron with sulfuric acid and was fed from there along a pipe into the balloon.
The balloon was one of the
earliest flying
machines. It was designed and built by'a Frenchman. Jacques Charles. On 27th August, 1783. One took off
from a park in the middle
of Paris. Thousands of people
watch the take off,
Making the most of a free gift.
In a time of energy shortage, you aren't likely to be impressed by a home which loses 99.9% of the heat supplied
to it. And yet your home
– the Earth-does just that. Every day, a huge quantity of heat energy, reaches the Earth from
the sun. Much of this heat
is absorbed, warming up the land and the sea, but then, at night, practically all of the absorbed heat is Lost
again. It escapes into space as
radiation while the Earth cools down.Tuesday, August 12, 2014
Hot but no hotter.
It's very likely that the classroom where you are working just now is heated by part of a very large central heating system. Somewhere in the school, there wiII be a big boiler where water is heated by burners which use oil or gas. The hot water is piped to radiators in the classroom. There it gives out the heat to keep you warm.
Like every workplace, a school has to be run at a comfortable temperature. In fact, the law
sets a minimum classroom temperature. Architects have to do some careful calculations when they are designing a school. They have to make sure that the boiler can supply Enough heat to keep aII the classrooms at the correct temperature even in the coldest weather. Heat energy
is measured in
kilojoules’:
Saving body heat.
The-most important heat to save is your body heat. If your body gets too cold' it won't work properly. Then you are said to be suffering from hypothermia.
You are unlikely to suffer from hypothermia - as long as you have shelter, enough
clothes to wear
(and, of
course, "enough to eat). But some people like divers, mountaineers and astronauts, live and work in more extreme conditions. For them, hypothermia is a real problem. They have to wear special
clothes to survive.
Two tone balloons.
How can the balloon
be kept in the air? That's the problem facing every balloonist who wants to make a really long flight. Giving the balloon a
two-tone, silver and black colour scheme doesn't solve the problem, but it certainly can help!
First across
the Atlantic - Double Eagle II
The first balloon to cross the
Atlantic (Double Eagle II) had a silver and black colour scherne. It was crewed by three Americans, Ben Abruzzo, Max Anderson, and Larry Newman. The crew, their equipment and bags of
sand ballast were carried in the balloon's gondola, a small steel and fiber glass boat.
The gondola and its contents were kept in the air by the balloon's envelope.
heat out,and in.
Giving heat out….
This is a heat picture called a thermogram. It was taken using a
special camera which detects heat rays.
The thermogram shows someone drinking out of
mug. (you can see a normal photograph of the person above) The colours on the
thermogram show how much heat is being given out. Use the colour code, and the
thermogram, to answer the questions.
1. Which
part of the person gives out: a) most heat.
b)least heat?
2. Why
do some parts of the person lose more heat than others?
3. Which
gives out more heat, the person’s head or arms?
4. Is
it a hot or cold drink?
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