Multiple Choice
Which of the following methods can be used to determine the density of an object?
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1. Intro to General Chemistry
Density
Multiple Choice
How does the density of water change as its temperature decreases from warm to cold?
A
The density decreases as water cools.
B
The density first increases, then decreases as water cools.
C
The density increases as water cools.
D
The density remains constant regardless of temperature.
Verified step by step guidance1
Understand that density is defined as mass per unit volume, given by the formula \(\text{density} = \frac{\text{mass}}{\text{volume}}\).
Recall that for most substances, as temperature decreases, the molecules move closer together, causing the volume to decrease and density to increase.
Recognize that water exhibits an unusual behavior: as it cools from warm temperatures down to about 4°C, its density increases because the molecules pack more tightly.
Note that below 4°C, water begins to expand due to the formation of a more open hydrogen-bonded structure, causing the density to decrease as it approaches freezing.
Conclude that the density of water first increases as it cools from warm temperatures to 4°C, then decreases as it cools further toward 0°C.
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