Practice Review Questions Physical Science

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties, such as burning or rusting.

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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, such as melting or dissolving.

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What is solubility?

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Solubility is the ability of a substance (solute) to dissolve in a solvent, forming a solution.

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What are indicators of a chemical change?

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Indicators of a chemical change include a change in color, temperature, formation of gas, or the production of light.

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What is an example of a physical change?

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Making sugar water is an example of a physical change, as the sugar dissolves in water but does not change its chemical structure.

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What happens to wax when a candle burns?

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When a candle burns, the wick burns and smoke is produced, which is a chemical change, while the melting and hardening of wax are physical changes.

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What is the difference between a mixture and a compound?

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A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond together.

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What is density?

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Density is the mass of a substance divided by its volume, often used to determine whether an object will float or sink in a fluid.

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What is an example of a chemical change?

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Rusting of metal is an example of a chemical change, as it involves a reaction with oxygen that alters the metal's properties.

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What is evaporation?

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Evaporation is the process by which liquid turns into vapor, often used to separate a solute from a solvent.