The Effect Of Heat On Matter (melting&freezing).ppt2

The Effect Of Heat On Matter ~Melting and Freezing~

Apr 11, 2009

Member : Farah Dinah Hafizhah Susan Zee Kee Hijan Rahmatullah Ain Hassanah Farah Dinah

Melting... Freezing... Experiment...

Apr 11, 2009

Farah Dinah

Apr 11, 2009

Farah Dinah

Melting... The process of changing a solid to liquid is called melting. The change in the state of matter takes place at a certain temperature. The temperature at which a solid changes and becomes liquid is it melting point. Apr 11, 2009

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As an example, the melting point for ice is 0 °C. This means that at 0 °C, the ice melts and becomes water. When heated, solid particles absorb energy and vibrate faster.

Apr 11, 2009

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The particles move further apart from each other. The process of melting takes place, that means solid melts to form liquids.

Apr 11, 2009

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heated or

absorbtion of heat

Particles absorb heat and energy and vibrate faster.

heated or

absorbtion of heat Particles move about freely within a fixed place.Solid melts.

Apr 11, 2009

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Freezing...

The process of changing a liquid to

a solid is called freezing. The temperature at which a liquid changes and becomes solid is called freezing point. As an example, the freezing point for water is 0 °C. This means that at 0 °C, water freezes and becomes ice. Apr 11, 2009

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During the cooling process,

energy is given out or released from liquid. The particles move very slowly and group closer together and the process of freezing takes place.

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cooling or release heat

Particles move slowly and become closer to each other. Liquid freezes.

Energy is released from the particles.

Apr 11, 2009

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Apr 11, 2009

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Experiment... Aim... To study the process of melting and freezing...

Statement of problem... How does the change of states of matter take place in the Process of meling and freezing?

Hypothesis... Solids melt when heated while liquids freeze when cooled.

Variable that... is kept constant : quantity of wax. is manipulated : heating or cooling. respond : change in the state of matter by physical means. Apr 11, 2009

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Method... b) c) d) e) f) g)

A test tube is held with a test holder. Some wax is added into test tube. The wax is heated with a bunsen burner. The observation is recorded. The apparatus is left to cool to room temperature. The observation is recorded again.

Observation...

Solid wax changed to liquid form went heated. Solid wax melted. Liquid wax changed to solid wax when cooled. Liquid wax froze.

Analysis... l)

m) Apr 11, 2009

The process of melting takes place when solid wax changes to a liquid form. The process of freezing takes place when liquid wax changes to a solid form. Farah Dinah

Conclusion... b) Solid melt when heated while liquids freez when cooled. The hypothesis accepted.

c) Discussion... e) Heat absorbed by solid wax enables it f)

Apr 11, 2009

to melt to form liquid wax. Heat released by liquid wax enables it to freeze to fom solid wax.

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Apr 11, 2009

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By Farah Dinah & Hafizhah