| 21 Results |
| Solids (Other (1)) |
| A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook. |
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| Solutions (Movie/Animation, Audio/Visual (9)) |
| Reactions and demonstrations exploring the concepts of solutions. |
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| Hardness of Solid Substances - Grinding (Movie/Animation, Audio/Visual (9)) |
| A number of metals and nonmetals are ground with a mortar and pestle. The nonmetals shown here are all soft (due to weak intermolecular forces), but the metals vary in hardness. |
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| Plastic Sulfur (Movie/Animation, Audio/Visual (5)) |
| Yellow powdered sulfur is heated until it becomes molten and brown. At first it flows freely, but then it becomes very viscous. Upon further heating, the viscous sulfur flows freely again and ignites. The burning liquid sulfur is poured into a beaker of water. When removed from the water, the sulfur is rubbery and flexible. |
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| Solids-Liquids (Movie/Animation, Audio/Visual (23)) |
| Reactions and demonstrations exploring the properties of solids and liquids. |
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| Thermochromism: Mercury(II) Iodide (Movie/Animation, Audio/Visual (2)) |
| When red-orange Mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126oC to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color. |
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| Piezoelectric Effect (Movie/Animation, Audio/Visual (2)) |
| Sounds accompany the discharges of electricity.
A piezoelectric crystal is connected to a light bulb. When the crystal is pressed, the light flashes. |
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| Sodium Chloride Crystal Cleavage (Movie/Animation, Audio/Visual (2)) |
| A knife is placed on a large sodium chloride crystal parallel to a cleavage plane. When the knife is tapped, the crystal breaks cleanly, creating two smaller crystals. |
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| Enthlapy-Thermodynamics (Movie/Animation, Audio/Visual (10)) |
| Reactions and demonstrations the explore thermodynamic concepts. |
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| Intermolecular_Forces__Liquids_and_Solids : ClassifySolids (10 Variations) (Assessment Material (1)) |
Classify each of the following substances, in the solid state, as molecular, ionic, covalent network, or metallic.
| Substance
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Appearance
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Melting Pt. (¬?C)
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Boiling Pt. (¬?C)
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Conducts as solid
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Conducts as liquid
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| A
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Colorless crystal
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-121
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20.8
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no
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no
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| B
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Colorless crystal
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846
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1505
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no
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yes
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| C
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Silvery gray
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1675
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3260
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yes
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yes
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| D
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Colorless crystal
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1713
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2590
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no
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no
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| Solids, Liquids & Gases (Activity, Instructional Material (3), Activity (2), Instructional Material (4), Test, Assessment Material (3)) |
| ACS Science for Kids resources explore the chemical and physical properties of solids, liquids, and gases. |
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