General Chemistry Lab - Density

Flashcards about density and its determination in the lab.

What is density?

Mass per unit volume.

What is the SI unit of density?

kg/m3

What is density used for?

Physical property used for identification of substances.

Why is density an intensive property?

It is independent of the mass or size (volume) of the substance.

How do temperature and pressure affect the density of a substance?

Increase temperature, volume increases, density decreases; Increase pressure, volume decreases, density increases.

At fixed temperature and pressure, how do the densities of solids, liquids, and gases compare?

Density of solid > density of liquid > density of gases.

What is the density of ice?

0.9167-0.9168 g/cm3

What is the density of water?

0.9998 g/cm3

Name some equipment used for the density experiment.

Electrical balance, ruler, dropper, graduated cylinder.

How do you reset the balance to zero?

Press the ‘tare’ button to reset the balance to zero.

What is the formula for the volume of a regular solid?

(length x width x height)

What is the Liquid (Solvent) displacement method?

Method used to determine the volume of irregular shaped solid.

What are the conditions for the liquid (solvent) displacement method?

The solid sample should not react with the liquid (water); The solid must sink inside the liquid; Accurate meniscus reading is very important.

How can air bubbles be removed from a measuring cylinder?

By tapping on the sides of the measuring cylinder.