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Magic Man

on 23 March 2013

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Transcript of CHEMISTRY

Chemistry kinetic changes gaseous state Objectives:
we are going to learn about the first 4 chapters in the text book
(kinetic particle theory,
measurements and experimental techniques,
separation and purification
elements compounds and mixtures. States
Matter Has fixed shape
Has fixed volume
Cannot be compressed Solid Liquid has fixed volume
cannot be compressed
does not have fixed shape Gas does not have fixed volume and shape
compressible Particle arrangement:
closely packed,
held together by very strong inter-molecular forces,
cannot move freely
can only vibrate. Particle arrangement:
disorderly packed
closely packed together but not as closely as a solid
held together by strong inter-molecular forces
move freely throughout the liquid Pure Substances -pure liquid/solid has an exact and constant boiling point/melting point -an element is a pure substance, it cannot be broken down into two or more simpler substance by chemical processes to classify elements check whether it is
metals, non-metals
or metaloids check its
physical states can exist as atoms molecules also called monatomic
elements also called diatomic molecules polyatomic
molecules -a compound is a pure substance containing two or more elements that are chemically combined in a fixed ratio composition of
compound molecules ions(electrically charged particles) examples Oxygen, O2
iodine, I2 examples argon, Ar
neon, Ne
examples ozone, O3
sulfur, S8 fragrance condense water+flower boiling conclusion: the mixture of flower and water start to boil when the temperature increases.at this moment , there will have fewer gases can escape through the process,
you will be able to smell the
fragrant as it is boiling. why we can smell the fragrance so fast? 2)The molecules of perfume are in a gaseous state and mixing with the molecules of air in the room.they are all moving around quickly and randomly (in all directions). so it can spread very quickly ,you will be able to smell quickly. 1)All these effects are due to diffusion,
Diffusion is the movement of one type of gas molecules through another. Perfume through air, manure through air, food through air so on . 3)air particles move at a high speed compare to solid and liquid. it can be dangers too. explosion of gas.gas poisonous upon heating,when the flower and water
get hotter and hotter , the mixture
start to boil.during boiling,the temperature
remains the same,it used to overcome the
forces of attraction to break the intermolecular bonds. condensation take place when energy taken
away from a substance changes it from gaseous
state to liquid state,without change in temperature.

heat is given out by the gas particles during condensation.eventually, it change gas to liquid state as the gas particles move slow enough when condenses. thank you !!!!!! decomposition
of compound thermal
decomposition Electrolysis heating the
compound strongly process of using electricity to
break down a compound Compound & mixture is made up of two or more substances
that are not chemically combine mixing two element combining two element
Eg: by heating can be separated by physical processes
Eg: filtration, distillation & magnetic separation can be broken down broken down into its elements by thermal decomposition or eletrolysis chemical properties are
the same chemical properties are
the different can be mixed in any ratio no chemical reaction takes place when mixture is formed always combine in fixed ratio there is a chemical reaction takes place when compound is formed.
Eg: energy change(get hot or cold)
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