Lecture 2.2- Mixtures

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The document discusses classifying mixtures as either heterogeneous or homogeneous. A heterogeneous mixture is one where the composition varies throughout, containing two or more distinct phases. A homogeneous mixture, also called a solution, has uniform composition throughout and consists of a single phase. Differences in physical properties like density can be used to separate mixtures into their individual components.

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Different objects have different heat capacity. Sand has a low heat capacity and gets hot quickly while sea water has a high heat capacity and gets hot slowly. Heat capacity of an object increases when the mass of the object increases. For example, the water in a full kettle takes a longer time to boil compared to the water in a half-fi lled kettle. This shows that water of bigger mass has a higher heat capacity compared to water of smaller mass. Several daily situations involving heat capacity also discussed. 4.2 Specific Heat Capacity 4.2.1 Explain heat capacity, C. 4.2.2 Define specific heat capacity of a material, c 4.2.3 Experiment to determine: (i) the specific heat capacity of water (ii) the specific heat capacity of aluminium 4.2.4 Communicate to explain the applications of specific heat capacity in daily life, material engineering and natural phenomena. 4.2.5 Solve problems involving specific heat capacity 2.2.3 Thermal capacity (heat capacity) Core  Relate a rise in the temperature of a body to an increase in its internal energy  Show an understanding of what is meant by the thermal capacity of a body Supplement • Give a simple molecular account of an increase in internal energy • Recall and use the equation thermal capacity = mc • Define specific heat capacity • Describe an experiment to measure the specific heat capacity of a substance • Recall and use the equation change in energy = mcΔT

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