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Chapter 1: Problem 22

a. Define physical property. b. List two examples of physical properties.

Short Answer

Expert verified
A physical property is a characteristic that can be observed without changing the substance's identity. Examples include density and color.

Step by step solution

01

Define a Physical Property

A physical property is a characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include density, color, mass, volume, and state of matter (solid, liquid, gas).
02

Example 1 - Density

Density is a physical property that measures the amount of mass per unit volume of a substance. It is usually expressed in grams per cubic centimeter (g/cm鲁).
03

Example 2 - Color

Color is a physical property that describes the appearance of a substance as perceived by the human eye. It can identify substances and can also be an indication of purity or the presence of some impurities.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Characteristics of Substances
When studying physical properties, we're essentially examining the characteristics of substances. These are traits that can be observed or measured without altering the substance itself. This means the substance's chemical identity stays the same. The major characteristics include:
  • Density
  • Color
  • Mass
  • Volume
  • State of matter (solid, liquid, gas)
Understanding these traits helps in identifying and differentiating between substances. It鈥檚 like recognizing people by their height, weight, or hair color. These attributes don鈥檛 change who they are fundamentally.
Density
Density is a crucial physical property. It tells us how much mass is packed into a given volume. The formula to calculate density is: \[\text{Density} = \frac{\text{Mass}}{\text{Volume}}\] This property is often measured in grams per cubic centimeter (g/cm鲁). For instance, if you have a substance with a mass of 10 grams and a volume of 2 cubic centimeters, its density would be: \[\text{Density} = \frac{10 \text{ g}}{2 \text{ cm}^3} = 5 \text{ g/cm}^3\] More compact substances have higher densities. For example, metals tend to have higher densities than liquids like water. Understanding density is important in fields like material science, chemistry, and physics.
Color
Color is another fundamental physical property. It describes how a substance interacts with light and is perceived by our eyes. Color can help identify substances and sometimes indicates their purity. Think about a gold nugget鈥攊t has a distinct golden-yellow color. However, if impurities are present, the color might differ. This makes color useful in fields like chemistry and mineralogy. It鈥檚 an easy-to-use property that often gives quick information about a substance without requiring complex equipment.

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Most popular questions from this chapter

Interpreting Concepts a. Is breaking an egg an example of a physical or chemical change? Explain your answer. b. Is cooking an egg an example of a physical or chemical change? Explain your answer.

a. How does a solid differ from a liquid? b. How does a liquid differ from a gas? c. How is a liquid similar to a gas? d. What is a plasma?

How can you tell the difference between an element and a compound?

How does the composition of a pure compound differ from that of a mixture?

Identify each of the following as either a physical change or a chemical change. Explain your answers. a. A piece of wood is sawed in half. b. Milk turns sour. c. Melted butter solidifies in the refrigerator.
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