Ch.1 - Introduction: Matter, Energy, and Measurement

Brown - Chemistry: The Central Science 15th Edition

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Brown 15th Edition

Ch.1 - Introduction: Matter, Energy, and Measurement

Problema 85a

Capitolo 1, Problema 85a

Two spheres of equal volume are placed on the scales as shown. a. Which one is more dense?

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Identify the concept of density: Density is defined as mass per unit volume, expressed as \( \rho = \frac{m}{V} \).

Recognize that both spheres have equal volume, meaning \( V_1 = V_2 \).

Understand that the density of each sphere depends on its mass, since the volumes are equal.

Observe the scales: The sphere that causes the scale to tip more is the one with greater mass.

Conclude that the sphere with greater mass is more dense, as density is directly proportional to mass when volume is constant.

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Density

Density is defined as mass per unit volume, typically expressed in grams per cubic centimeter (g/cm³). It is a physical property that indicates how much matter is packed into a given space. In this scenario, comparing the density of the two spheres involves determining which one has a greater mass while maintaining the same volume.

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Density Concepts

Mass

Mass is a measure of the amount of matter in an object, usually measured in grams or kilograms. It is an intrinsic property that does not change regardless of the object's location. In the context of the question, the mass of each sphere is crucial for determining their respective densities, as density is calculated by dividing mass by volume.

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Atomic Mass

Volume

Volume is the amount of space an object occupies, typically measured in cubic centimeters (cm³) or liters. For the two spheres mentioned, since they are stated to have equal volume, this factor remains constant when comparing their densities. Understanding volume is essential for calculating density, as it serves as the denominator in the density formula.

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Constant-Volume Calorimetry

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