1. Milk is considered a mixture rather than a pure substance because it contains various components such as water, fat, proteins, and minerals. These components maintain their individual properties within the mixture, making milk heterogeneous rather than homogeneous.

    Milk is considered a mixture rather than a pure substance because it contains various components such as water, fat, proteins, and minerals. These components maintain their individual properties within the mixture, making milk heterogeneous rather than homogeneous.

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  2. A scientist defines a pure substance as one consisting of a single type of particle, where all constituent particles are identical in their chemical nature. Pure substances exhibit uniform properties and cannot be separated into simpler substances by physical means.

    A scientist defines a pure substance as one consisting of a single type of particle, where all constituent particles are identical in their chemical nature. Pure substances exhibit uniform properties and cannot be separated into simpler substances by physical means.

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  3. In science, "pure" typically refers to substances or systems that are free from contamination or extraneous elements, allowing for precise study and analysis. It denotes a state of homogeneity and absence of impurities, enhancing experimental reliability and accuracy.

    In science, “pure” typically refers to substances or systems that are free from contamination or extraneous elements, allowing for precise study and analysis. It denotes a state of homogeneity and absence of impurities, enhancing experimental reliability and accuracy.

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  4. During evaporation, water molecules absorb energy from their surroundings, gaining kinetic energy. This increased energy causes the molecules to break free from the liquid phase and enter the gaseous phase, forming water vapor.

    During evaporation, water molecules absorb energy from their surroundings, gaining kinetic energy. This increased energy causes the molecules to break free from the liquid phase and enter the gaseous phase, forming water vapor.

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