3.15.a LAVOISIERS LAW , conservation of mass :
The Law of Conservation of Mass (or Matter) in a chemical reaction can be stated thus:
In a chemical reaction, matter is neither created nor destroyed, it only can be transferred or transformed.
It was discovered by Antoine Laurent Lavoisier (1743-94) about 1785. However, philosophical speculation and even some quantitative experimentation preceeded him. In addition, he was certainly not the first to accept this law as true or to teach it, but he is credited as its discoverer.
- After this, do the experience about acetone ans expanded polystirene
your teacher tells you about and follow his instructions.
( You will see how nothing happens when you place a piece of expanded
polystirene on water, but when placed on acetone it dissapears very
quick. But the issue is, is it a chemical reaction or only a physical
change? ).
PICTURE 1
PICTURE 2
PICTURE 3
( 10 points ).
3.15.b Once youve finished doing the experience fill out the paper given
in order to answet the questions :
3.15. Word search for remembering the vocabulary about chemical
reactions, periodic table and atoms structure :
( 2/13/18 Tuesday )
* Activity 3.16 : Reviewing chemical reactions vocabulary.
3.16.a LAVOISIERS LAW , atoms and chemical reaction vocabulary.
Reviewing activity :
( 10 points ).
( 2/14/18 Wednesday )
* Activity 3.17 : Chemical reactions using acids and other substances, about mixing
milk with alcohol, vinegar and lemon juice.
3.17.a Chemical reactions with acids. Milk, alcohol, vinegar and lemon juice :
Picture 1
Picture 2
Picture 3
Picture 4
Picture 5
When finishing making the experiments, write down on the given piece
of paper the results obtained during the performance of the
experiences. Dont forget to make a drawing about the 3 glasses with
the substances appeared.
( 10 points ).
( 2/15/18 Thursday )
* Activity 3.18 : Chemical reaction report about the experiments done yesterday
using milk, different kind of acids and alcohol.
3.18.a Answer the different questions at the following chemical report :
( 10 points ).
3.18.b Combustion reaction :
Watch the combustion reaction shown by your teacher and after that
fill out the given paper and copy the chemical reactions structure :
( 10 points ).
3.18.c Draw the requested atoms structures at the given paper :
( 10 points ).
( 2/16/18 Friday )
* Activity 3.19 : Combustion and flame.
3.19.a Check the following LINK to learn about different types of combustion and the flames structure.
After checking the link, answer these questions :
a) How would you explain what a combustion reaction is?
b) How many types of combustion can you list?
c) What does smouldering consist of?
d) Explain the most important about rapid combustion.
e) On a piece of paper draw a flames parts and explain its structure and
where the temperature is higher.
f) What is fuel?
( 10 points ).
3.19.b Watch the following VIDEOS about the combustion reactions and when
finished write a little summary about the most important you saw.
( 10 points ).
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