Fall Semester Final Review

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

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What is a chemical change?

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A chemical change occurs when a substance transforms into a different substance with different properties. This often involves a chemical reaction, such as rusting or burning.

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What is the formula for calculating the number of elements in a compound?

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The number of different elements in a compound can be determined by identifying the unique symbols in its chemical formula.

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What is dissolution?

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Dissolution is the process by which a solute (like a solid) dissolves in a solvent (like water) to form a solution.

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What factors affect the rate of dissolution?

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The rate of dissolution can be affected by temperature, surface area of the solute, stirring, and the nature of the solute and solvent.

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What is thermal energy?

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Thermal energy is the total kinetic energy of particles in a substance, which is related to its temperature.

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What are the three methods of thermal energy transfer?

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The three methods of thermal energy transfer are conduction, convection, and radiation.

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What is conduction?

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Conduction is the transfer of thermal energy through direct contact between materials, where heat moves from the hotter object to the cooler one.

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What is convection?

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Convection is the transfer of thermal energy through the movement of fluids (liquids or gases) caused by differences in temperature and density.

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What is radiation?

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Radiation is the transfer of thermal energy through electromagnetic waves, which can occur in a vacuum.