by colin ng(6) of 2o2
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Change in state of matter. By Colin Ng(6) of 2O2. These are the changes of states. Freezing. Evaporation. - PowerPoint PPT PresentationTRANSCRIPT
By Colin Ng(6) of 2O2
Change in state of matter
Freezing
These are the changes of
states
The process which a liquid’s (example a puddle of water) molecules becomes a gas
happens when atoms or molecules escape from the liquid and turn into a vapor
Can happen when liquids are cold or when they are warm
Do you know why evaporation only happens only on the surface of water?
I know I know !!It happens only on the surface of water as
molecules liked to move from areas of higher
pressure to lower pressure. The molecules are basically sucked into the surrounding area to even out the pressure.
Evaporation
Experiment you can doThings you will need:~a large measuring jug~ salt, a stick of chalk~two bowls (both the same size)~ a tape measure ~a plastic ruler
Experiment you can do Step 1 :Find two spots - a sunny area and a
shady area of concrete Step 2 :Dissolve some salt in a large measuring
jug of water Step 3 :Pour an equal amount of water onto the
concrete forming two big puddles one in the sun and the other in the shade. Trace a line around the outside of each puddle
Step 4 :Dissolve some more salt in some water and pour an equal amount of this into each bowl. Then place a bowl of salted water next to each puddle
Experiment you can do Step 5 :Measure across both the puddles
with the tape measure and then measure the depth of the water in both the bowls with the plastic ruler and record the four measurements
Step 6 :Return to the area every hour and keep measuring the puddles. You can keep drawing new lines around the puddles as they get smaller. Also check the jars each day to see what happens to the water and salt.
is a process that results in the change of a substance from a solid to a liquid
The energy of a substance is increased, typically by the application of heat or pressure, resulting in a rise of its temperature to the melting point, at which the rigid ordering of molecular entities in the solid breaks down to a less-ordered state and the solid liquefies
Heat is taken in in the process of melting…
Melting
Experiment you can doThings you will need: ~Ice pieces
~Evaporation dish
Experiment you can do
Experiment
Leave ice pieces on a evaporation dish. Observe it
every one hour and record it. What will youobserve?
is the formation of liquid drops from water vapor
usually occurs when a parcel of rising air expands and cools
occurs during the formation of dew keeps the Earth's climate cooler that
it would otherwise be if there were no water
Now I know what is
condensation!!
Condensation
Experiment you can doThings you will need~yourself
In cold weatherBreathe out outdoor. What do you observe?
Experiment you can do Things you will need ~ a glass of icy cold water ~ evaporating dish ~a fridge
In hot weatherPour out a glass of icy cold water from the
fridgeon a evaporating dish during a hot days.
What do you observe?
Sublimation is the term for when matter undergoes a
phase transition directly from a solid to gaseous form, or vapor, without passing through the more common liquid phase between the two
Heat energy is absorbed when solid changes into a gas
Heat is given out when a gas change into a solid
Experiment you can doThings you will need~a spoon
~dry ice
~Bunsen burner
Experiment you can doExperimentFirst, To begin, warm a spoon by holding it
abovea flame for a few minutes. Next, place the
spoonfirmly against the chunk of dry ice. What
will youobserve?
Deposition Is a process in which gas transforms into
solid (also known as desublimation) Is the reverse of deposition is sublimation One example of deposition is
the process by which, in sub-freezing air, water vapor changes directly to ice without first becoming a liquid
This is how snow forms in clouds, as well as frost and hoar frost on the ground
Another example of physical deposition is the artificial
process of physical vapor deposition, used to deposit thin films of various
materials onto various surfaces!
Freezing Is the process in which a liquid turns into a
solid when cold enough
Happens at 0°C for pure water
Heat is given out in the process
is a common method of food preservation which slows both food decay and the growth of micro-organisms
Did you know that the temperature of a liquid stays constant in the process of
freezing…
Of course, I knew about it the moment I was born!! Also, I knew that when a
liquid freezes, its particles slow down to take up
fixed and orderly position in the solid.
Experiment you can do Things you will need: ~Water
~Freezer
~Cooking Oil
~Clear Plastic Container (like a glass or cup)
Experiment you can do Steps:1. Pour some water into the clear plastic
container2. Add some cooking oil3. Leave this for a few minutes4. Put the container into the freezer for a
few hours5. Remove from freezer. The oil is nowunderneath the water
Videos about the changes of state
http://www.youtube.com/watch?v=y9Nou6g-zwQ&feature=related ( evaporation)
http://www.youtube.com/watch?v=qbQjukRmLSg (melting)
http://www.youtube.com/watch?v=HF_hLpH2yaQ&feature=related (freezing)
http://www.youtube.com/watch?v=dABCmlq2MNY&feature=related (condensation)
http://www.youtube.com/watch?v=0_LWBgeQrvk&feature=related (sublimation)
1. What are the 6 changes in state?
2. What is the change of state for Deposition, Sublimation, Melting, Freezing, Evaporation and Condensation? ( Example: Melting-from solid to liquid)
3. Why evaporation only happens at the surface?
QuestionsNote: please answer the question on a piece of writing paper. I will mark it! The one who got the most correct will get a prize.
Questions
4) What is one example of Deposition?
5) Heat is taken in or given out for sublimation?
6) What are the brief description of each change?(Example: Evaporation is the process which a liquid’s (example a puddle of water) molecules becomes a gas)
Note: please answer the question on a piece of writing paper. I will mark it! The one who got the most correct will get a prize.
Biblography The Encyclopedia of World http://www.wardthomas.com/surveyform/i
mages/Kitchen/elec_fridge_.jpg http://www.chem4kids.com/ http://www.meltingpot.com/locations.asp
x http://www.weatherquestions.com/What_i
s_condensation.htm http://www.ace.mmu.ac.uk/eae/weather/o
lder/condensation.html
Thank you!!
Any question?