Ch.1 - Intro to General ChemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Scientific Notation
Accuracy & Precision
Standard Deviation, Mean, Median & Mode
Metric Prefixes
Significant Figures
Energy, Heat and Temperature
Physical & Chemical Changes
Dimensional Analysis
Intro to Chem Additional Problems
Additional Practice
Types of Energy
Additional Guides
The Scientific Method
Physical & Chemical Properties

Density represents the mass of an object or compound within a given volume. 

Understanding Density

Concept #1: Understanding Density


We're going to say that we use density to understand the relationship between mass and volume. Now usually when we're dealing with mass, mass will be in grams. And when we're dealing with volume, volume may be in milliliters or in liters.
Now we talked about there being three states of matter: solids, liquids, and gases. We're going to say that solids and liquids are more dense than gases. The density for solids and liquids will have the units of grams over milliliters.
Gases, on the other hand, are way less dense. We're going to say that gases, their density are in units of grams over liters. Later on in this semester when we pay more close attention to gases, we're going to see why that is. But for right now we're just going to when it comes to density it's going to be mass over volume. And if we're dealing with a solid or a liquid it's going to be grams over milliliters.

Density establishes a relationship between mass and volume

Example #1: If the density of an unknown metal is 21.4 grams per cubic centimeters, express its density in pounds per cubic feet. Remember that 1 in = 2.54 cm.

Density questions can include dimensional analysis so remember to use the same approach as you would normally. 

Example #2: A piece of unknown metal weighs approximately 0.45 lbs. When a scientist places it in a glass beaker the water level increases from 1.85 L to 2.13 L. What is the density of the palladium metal in g/mL? 

In a water displacement question the volume of the water increases with the added volume of the unknown substance. 

Practice: The U.S. Environmental Protection Agency sets the maximum safe level of lead in blood at 24 μg per dL of blood. The average person has 60 mL of blood per kilogram of body weight. For a 63.7-kg (140.459 lb) person, what is the total maximum safe content of lead in blood?