HN Midterm Review #1

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What are physical properties?

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Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, odor, taste, and boiling point.

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What are chemical properties?

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Chemical properties describe a substance's ability to undergo changes that transform it into different substances. Examples include reactivity with acids, flammability, and oxidation states.

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What is hydrochloric acid?

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Hydrochloric acid (HCl) is a strong acid commonly used in laboratories and industry. It is a colorless, corrosive liquid that is a major component of gastric acid.

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How do you determine significant figures in a number?

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Significant figures are determined by counting all non-zero digits, any zeros between significant digits, and trailing zeros in a decimal number. For example, 76400.0 has 6 significant figures.

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What is the freezing point of water?

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The freezing point of water is 0 degrees Celsius (32 degrees Fahrenheit) under standard atmospheric conditions.

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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 a different chemical composition. Examples include rusting, burning, and digestion.

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What is the difference between physical and chemical properties?

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Physical properties can be observed without changing the substance, while chemical properties can only be observed during a chemical reaction.

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What is an example of a physical property?

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An example of a physical property is the color of a substance, such as the blue color of copper sulfate.

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What is an example of a chemical property?

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An example of a chemical property is the ability of iron to rust when exposed to moisture and oxygen.