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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).
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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
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Others
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
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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
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Others
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
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Others
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
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Others
Students examine standard pressure in this interactive object.
- Subjects:
- Chemistry
- Keywords:
- Boyle's law Gas laws (Physical chemistry)
- Resource Type:
- Others
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Others
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
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Others
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
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Others
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