객관식
A sample has a mass of 25 g and a volume of 2.8 mL. What is the density of this sample?
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1. Intro to General Chemistry
Density
객관식
Which statement best explains how the density of an object determines whether it will sink or float in water?
A
An object will float if its density is greater than the density of water.
B
An object will float if its density is less than the density of water.
C
An object will sink only if its mass is greater than the mass of water.
D
An object will always float regardless of its density.
검증된 단계별 안내1
Understand the concept of density, which is defined as mass per unit volume, mathematically expressed as \(\text{density} = \frac{\text{mass}}{\text{volume}}\).
Recall that whether an object sinks or floats in a fluid (like water) depends on the relative densities of the object and the fluid.
Compare the density of the object to the density of water (approximately 1 g/cm³ or 1000 kg/m³): if the object's density is less than that of water, it will float; if it is greater, it will sink.
Recognize that the mass alone does not determine sinking or floating; it is the density (mass relative to volume) that matters because buoyant force depends on the volume of fluid displaced.
Conclude that the correct explanation is: an object will float if its density is less than the density of water, and sink if its density is greater.
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