WGU Introduction to Chemistry (D425) New OA Set 2 with Answers & Rationale

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Homogeneous mixture

When table salt (sodium chloride) is dissolved in water, it forms a uniform solution where the salt is evenly distributed throughout. This is classi῿ed as a homogeneous mixture.

The substance has a freezing point of -114°C and a boiling point of 98°C. At 25°C, the temperature is between the freezing and boiling points.

Therefore, the physical state of the substance at 25°C is: Liquid.

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Compound

Water (H₂O) is a chemical compound composed of two hydrogen atoms covalently bonded to one oxygen atom.

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Intensive and physical

The boiling point of water is a physical property because it does not involve a change in the chemical composition of water, and it is intensive because it does not depend on the amount of water present.

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Physical and extensive

Weight is a physical property because it does not involve a change in the chemical composition of the wrestler. It is an extensive property because it depends on the amount of matter (the wrestler's body mass).

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Chemical change

When eggs are cooked, the proteins in the egg undergo denaturation and coagulation, creating new substances. This is an example of a chemical change, as the original chemical structure of the egg changes permanently.