Learners read the definition of atomic weight and obtain the weights of elements by viewing the Periodic Table and charts that list atomic weights by name or symbol.

Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

Students read how to determine and calculate the dry unit weight for a given sample of soil or aggregate based on the weight-volume relationship.

Students read how to determine and calculate the saturated unit weight for a given sample of soil or aggregate, based on the weight-volume relationship. Practice problems complete the activity.

Students read about the concept of unit weight relating to the 3-phase diagram and perform calculations.

In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.

Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.

In this learning activity you'll explore the difference between mass and weight.

Students read how to determine and calculate the porosity for a given sample of soil or aggregate, based on the weight-volume relationship.

Students read how to determine and calculate the void ratio for a given sample of soil or aggregate based on the weight-volume relationship.

Students read how to determine and calculate the degree of saturation for a given sample of soil or aggregate based on the weight-volume relationship.

Students read an explanation of the use of weight-volume relationships and practice calculating density.

This interactive learning object demonstrates how the moisture content is determined for a given sample of soil or aggregate.

In this animated activity, students read about weight-volume relationships within a given sample of soil or aggregate. They complete problems using a 3-phase diagram.

Students read how to determine and calculate the saturated density for a given sample of soil or aggregate, based on the mass-volume relationship. Practice problems complete the activity.

In this animated object, learners examine the chemistry behind table salt.

Students read how to determine and calculate the dry density for a given sample of soil or aggregate based on the mass-volume relationship.

Learners calculate gas density from the standard molar volume and observe how the density increases with the increasing molecular weight of the gas.

Learners follow a four-step process to determine the empirical formula of a compound from the masses of its constituent elements. The molecular formula is determined in a fifth step using the molecular weight of the compound.