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Chemistry C1L4 Density

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dan lin

on 12 January 2016

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Transcript of Chemistry C1L4 Density

Why do some objects float in water, while others sink in water?
Can we simply say that a substance floating in a liquid is lighter than the liquid?
Is a log lighter than a cup of water?
To compare fluids using the words "light" and "heavy," you must examine the same volume of each fluid.
The same can be said for solids with the same volume.
When you are comparing the masses of the same volume of
different substances, you are comparing their densities.
Density is the mass per unit volume of a substance.
It is expressed as grams/cm3 or grams/mL
Density = mass/volume
Water has a density of 1g/ml.

Which of the following substances will float in water?
An unknown liquid substance's volume 3.0 mL and its mass is 1.2 grams.
What is its density?
Will it float in water?
A solid has a width of 3 cm, length of 4 cm, and height of 2 cm.
Its total mass is 48 grams.
What is the density of the solid?
Will it float in water?
Homework Time
Read pages 107-109
Questions 1 & 3
Density Handout
The density of a substance does not depend on its size or shape. As long as a substance is homogeneous, the density will be the same. This means that a steel nail has the same density as a cube of steel or a steel girder used to build a bridge.
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