Open Educational Resources | Pao Yue-kong Library, The Hong Kong Polytechnic University

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Heat of Fusion and Heat of Vaporization

Learners examine graphs and read that the heat of fusion is the heat energy absorbed by one mole of solid as it is converted to liquid, while the heat of vaporization is the heat energy absorbed by one mole of liquid as it is converted to gas.

Subjects:: Chemistry
Keywords:: Heat
Resource Type:: Others

Others

Boiling Point of a Liquid

Learners examine how the boiling point increases with increasing pressure. An example from industry is given.

Subjects:: Chemistry
Keywords:: Boiling-points
Resource Type:: Others

Others

How Pressure Changes Boiling Temperature

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

Subjects:: Chemistry
Keywords:: Heat -- Transmission Pressure Boiling-points
Resource Type:: Others

Others

Charles's Law

Learners view an animation showing how the volume of a given quantity of gas varies directly with its temperature.

Subjects:: Chemistry
Keywords:: Charles' law Gas laws (Physical chemistry) Gase -- Thermal properties
Resource Type:: Others

Others

Isotopes

The definition of an isotope is illustrated using the three isotopes of carbon. The three isotopes of hydrogen are discussed as exceptions.

Subjects:: Chemistry
Keywords:: Isotopes
Resource Type:: Others

Others

Unit Conversions

In this animated and interactive object, learners follow two rules to write unit conversion fractions.

Keywords:: Metric system Units of measurement
Resource Type:: Others

Others

Atomic Weight

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.

Subjects:: Chemistry
Keywords:: Periodic table of the elements Chemical elements Atomic weights
Resource Type:: Others

Others

Macroscale vs. Nanoscale

In this colorful, interactive object, learners examine how materials on the nanoscale compare with those on the macroscale. The focus is on the difference between macroscale and nanoscale gold in both color and melting point.

Subjects:: Chemistry
Keywords:: Nanoscience
Resource Type:: Others

Others

Pressure and Boyle's Law

Students examine standard pressure in this interactive object.

Subjects:: Chemistry
Keywords:: Boyle's law Gas laws (Physical chemistry)
Resource Type:: Others

Others

Absolute Zero Temperature

Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.

Subjects:: Chemistry
Keywords:: Temperature Low temperatures
Resource Type:: Others

Others

Equilibrium

In this animated object, students examine the role equilibrium plays in everyday life. Formulas are presented in an interactive way.

Subjects:: Chemistry
Keywords:: Chemical equilibrium
Resource Type:: Others

Others

Melting Point and Freezing Point

Learners observe that the melting of a solid and the freezing of its liquid occur at the same temperature. The melting point is an intrinsic property and is used to identify a substance.

Subjects:: Chemistry
Keywords:: Melting points Freezing points
Resource Type:: Others

Others

Oxidation Numbers

Learners assign oxidation numbers to atoms in neutral compounds and in polyatomic ions. Six examples are worked through in detail, and three problems are provided.

Subjects:: Chemistry
Keywords:: Reduction (Chemistry) Chemical reactions Oxidation Oxidation-reduction reaction
Resource Type:: Others

Others

A Biological Example of Water Solubility

In this animated object, students examine the role that the solubility of water plays in various biological functions.

Subjects:: Chemistry
Keywords:: Water chemistry
Resource Type:: Others

Others

The Solid State

In this well-illustrated object, learners examine the structures and properties of the four types of solids: molecular, metallic, ionic, and covalent network. Five interactive questions are provided.

Subjects:: Chemistry
Keywords:: Solid state chemistry
Resource Type:: Others

Others

Ions

Ions are electrically charged particles obtained from an atom or from a chemically bonded group of atoms by adding or removing electrons. Eight examples illustrate the number of protons, neutrons, and electrons in positive ions (cations) and in negative ions (anions).

Subjects:: Chemistry
Keywords:: Ions
Resource Type:: Others

Others

Determining Empirical and Molecular Formulas (Screencast)

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.