Science

Synopsis Grade 9 Science Term I

Chapter 1: Matter in Our Surroundings
? Characteristics of matter particles
? There are spaces in the midst of matter particles
? Matter particles move continuously movement increases with acclivitous temperature
? Attract each other decreasing order of promote of attraction: solids > liquids > gases
? Solid phase: Have permanent shape, sizing and boundary with negligible squeezability
? Liquid phase: Have a fixed volume with low compressibility but no fixed shape
? Gaseous state: Have high compressibility with no fixed shape, volume, and boundary
? boiling point: temperature at which the drying up pressure becomes equal to the
atmospheric pressure. It can also be referred to as the temperature at which a liquid
multifariousnesss to its vapours.
? Melting point ? Temperature at which a solid melts into a liquid at usual atmospheric
pressure.
? Effect of change of pressure
? If pressure is applied,
? Melting point ? decreases
? Boiling point ? increases
? Latent light up ? Heat required for suspension the force of attraction between the particles at
handing over temperature.
? Amount of heat required to change 1 kg of material to change its state at normal
atmospheric pressure at transition temperature is called the latent heat for that
transition.




? Dry ice ? Solid carbon dioxide
? Sublimation ? Process of changing of a solid to its gaseous form
? evapo ration ? Change of liquid into vapours at any temperature down the stairs the boiling
point. Takes the latent heat from body. Thus, the body cools when evaporation takes
place.
? Factors affecting evaporation
? bulge area ? If increases, rate of evaporation increases
? Temperature ? If increases, rate of evaporation increases
? humidity ? If increases, rate of evaporation decreases
? Wind speed ? If increases, rate of evaporation increases

Chapter 2: Is Matter around Us Pure
? Mixture Contains to a greater extent than one pure substance in any ratio/proportion
? Substance Cannot be separated...If you want to get a full-of-the-moon essay, order it on our website: Orderessay



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