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Question

Which statement best describes chemical properties of matter? Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.

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Erik

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#### Solution By Steps

***Step 1: Identify the key terms in the question***

- Chemical properties

- Matter

- Natural state

- Room temperature

- Normal atmospheric pressure

- Identity change

- New substances form

***Step 2: Analyze each statement for relevance to chemical properties***

- Statement 1: Focuses on density, which is a physical property, not a chemical property.

- Statement 2: Focuses on reactivity, which is a chemical property but does not involve a change in identity or formation of new substances.

- Statement 3: Focuses on combustibility, which is a chemical property and involves a change in identity and formation of new substances.

- Statement 4: Focuses on boiling point, which is a physical property, not a chemical property.

***Step 3: Determine the best description based on the analysis***

- The best statement should describe chemical properties that involve a change in the identity of a substance and the formation of new substances.

#### Final Answer

The statement that best describes chemical properties of matter is: "Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form."

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