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 do

Things 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 do

Things 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 do

Things 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 do

Things you will need~a spoon

~dry ice

~Bunsen burner

Experiment you can do

ExperimentFirst, 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?