20 Results
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
(Movie/Animation, Audio/Visual (9))
Reactions and demonstrations exploring the concepts of solutions.
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.
Electrical Conductivity-Solids   
(Movie/Animation, Audio/Visual (8))
The conductivity of various solids are tested.
Heat Treatment of a Metal Bobby Pin   
(Movie/Animation, Audio/Visual (6))
A bobby pin is subjected to various heat treatments.
Hardness of Solid Substances   
(Movie/Animation, Audio/Visual (5))
The hardness of various solids are compared.
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.
(Movie/Animation, Audio/Visual (23))
Reactions and demonstrations exploring the properties of solids and liquids.
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.
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.
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.
Simulation of Dislocations in Metals   
(Movie/Animation, Audio/Visual (2))
An array of soap bubbles is used to simulate a close-packed arrangement of atoms in a metal crystal.
(Movie/Animation, Audio/Visual (10))
Reactions and demonstrations the explore thermodynamic concepts.
Matter_and_Measurement : UseDensity (10 Variations)   
(Assessment Material (1))
If a 10.0 inch aluminum skillet weighs 3 pounds, how many cm3 of aluminum does it contain? The density of aluminum is 2.70 g/cm3.
Matter_and_Measurement : CalcDensity (5 Variations)   
(Assessment Material (1))
What is the density of a 7000 gram brick that is 4 inches x 5 inches x 3 inches?
Intermolecular_Forces__Liquids_and_Solids : ElectricalConductivity (8 Variations)   
(Assessment Material (1))
Which of the following has the greatest electrical conductivity?
Intermolecular_Forces__Liquids_and_Solids : DensityFromUnitCell (13 Variations)   
(Assessment Material (1))
Oldhamite (CaS) has a rock salt structure like NaCl (which has interpenetrating face-centered cubic structures). The ionic radius of Ca2+ is 0.99 angstroms, and the ionic radius of S2- is 1.84 angstroms. What is the density of CaS?
Intermolecular_Forces__Liquids_and_Solids : AtomRadiusUnitCell (7 Variations)   
(Assessment Material (1))
Nickel has a unit cell that is face-centered cubic with a volume of 43.763Å3. The atom at the center of each face just touches the atoms at the corners. What is the atomic radius of nickel?
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 Appearance Melting Pt. (¬?C) Boiling Pt. (¬?C) Conducts as solid Conducts as liquid
A Colorless crystal -121 20.8 no no
B Colorless crystal 846 1505 no yes
C Silvery gray 1675 3260 yes yes
D Colorless crystal 1713 2590 no no

Intermolecular_Forces__Liquids_and_Solids : Superconductors (4 Variations)   
(Assessment Material (1))
Which of the following statements is NOT an accurate description of superconducting materials?