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WHY DOES ICE MELT?WHY DOES ICE MELT?

How could you make it melt faster?

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What are different ways to melt ice?

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What are different ways to melt ice?

Anything that produces HEAT:

Like Putting pressure on it (squeezing, hammering etc) Hot water

Hot air

Fire

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Activity 1

In groups of four, think of the best way tomelt an ice block using the limitedresources in the classroom?

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Activity 2

Which of the following options melt ice the

fastest? Hot water

Cold water Running water

Hair dryer

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Explanation: So why does ice melt?

Structure:Structure: What is ice made of?

Water particles that do not move visibly

Water in its solid form- H2O molecules packed

close together

H2O H2O

H2O H2O

H2O H2O

H2O H2O H2O

H2O H2O H2O

H2O H2O H2O

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MELTINGMELTING

The process of changing solid into liquid

Occurs through the presence of HEAT

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

Heat energy

Heat energy

they are able to move around more.

So they tend to occupy more space.

melting

H2O

H2O

H2O

H2O H2O

H2O

H2O

H2O

H2O

H2O

As particles gain energy

Ice (solid)water (liquid)

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Remember:Remember:

Coldness is the ABSENCE of heat

There is a lack of energy in cold temperatures

Thus, water particles do not move visibly because they do not

have the sufficient amount of energy needed to move slightly

away from each other

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O

H2O H2O

H2O

H2O

H2O

H2O

H2O

Lack of heat = lack of energy Addition of energy = particles can

move more

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The Melting ProcessThe Melting Process

H2O- ice

> 0C

Environment

(e.g. water, air)

< 0C

The melting point of ice: 0C/ 32F

An environment above this

temperature will allow ice to melt and

turn into liquidIt is only through aIt is only through a

temperature difference thattemperature difference thatheat energy is transferred.heat energy is transferred.

For melting to occur, thesurroundings must overpower thesubstance to be melted in terms of

quantityand temperaturetemperature.

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How could we make ice melt faster?

It all depends on the Initial temperature of the ice

Size/ volume of the ice

Very high difference in temperature the substance used to melt has a relatively way higher

temperature than that of the ice

Quantity The substance used to melt also needs to be way

bigger in volume/ quantity than that of the ice there must be way more heat present than that of the

ice

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References:

Brown, T., LeMay, H.E & Burstein, B. (2008).Chemistry: The Central Science (11th ed.). USA:Prentice Hall

Editors of Childcraft. (Ed.). (1994). Changing water.In Young Scientist: All about water(Vol. 2, p. 26).USA: World Book, Inc.

Editors of Childcraft. (Ed.). (1994). Solid Water. InYoung Scientist: All about water(Vol. 2, pp. 32-33).USA: World Book, Inc.