5 th Science 12.Physical changes Sub Unit - 12.1 Introduction 12.2 Evaporation 12.3 Condensation 12.4 Dissolving 12.5 Boiling 12.6 Melting.

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Presentation transcript:

5 th Science 12.Physical changes Sub Unit Introduction 12.2 Evaporation 12.3 Condensation 12.4 Dissolving 12.5 Boiling 12.6 Melting

12.Physical change -A change in which The original Substance remains as it is and no new substances are formed is called physical change.

12.Physical changes 1)Evaropation 2)Condensation 3)Dissolving 4)Boiling 5)Melting

Evaporation Evaporation is the change of a liquid into a vapor at a temperature below the boiling point. This occurs at any temperature between the melting point and the boiling point. However, the warmer the temperature the more quickly the water will evaporate.

Condensation Condensation is the change of a gas or vapor to a liquid, either by cooling it or by subjecting the substance to an increase in pressure. When water vapor cools in the atmosphere, it condenses into tiny drops of water which form clouds.

3)Dissolving Mixing solid substance in liquid

The Process of Dissolving

Boiling The boiling is the liquid changes to a vapor or gas. Again this is a different temperature for different substances. For water the boiling point is 100°C

Melting To melt means to change a substance from a solid to a liquid state by heating it to the melting point. Different substances melt at different temperatures. Water melts at 0°C or 32°F.

Practice – Number your paper from 1 to 10. Decide the state or phase for each item. Is it... Melting Freezing Boiling Evaporating Condensing Sublimating

1. In which state is the snow? a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

2. In which state is the puddle? (Choose 2 answers.) a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

3. In which state is the fog? a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

4. In which state is the moisture on the bottle? a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

5. In which state is the puddle on the road? a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

6. In which state is the road? a)Melting b)Freezing c)Boiling d)Evaporating e)Condensing f)Sublimating

Reference – Text Book, Web. Produced By – Annasaheb Kalyani Vidyalaya, Camp Satara -Panchal Amol Dattanand Hsc.Ded.