Answer:
Ionic Bonds: Electrons are transferred b/c one atom "steals" electrons from another. The attraction between the resulting cation/anion is known as an ionic bond.
Polar Covalent Bonds: Electrons are shared <em>unequally</em>. This is in the case that the molecule is not symmetric or if the central atom has a lone (electron) pair.
Nonpolar Covalent Bonds: Electrons are shared <em>equally</em>. This is in the case that the molecule is symmetric and the central atom has no lone pairs.
Answer:
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Explanation:
The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc.
One of the most important tests for identifying mineral specimens is the Mohs Hardness Test.
This test compares the resistance of a mineral to being scratched by ten reference minerals known as the Mohs Hardness Scale (see table at left).
The test is useful because most specimens of a given mineral are very close to the same hardness. This makes hardness a reliable diagnostic property for most minerals.
"Hardness" is the resistance of a material to being scratched. The test is conducted by placing a sharp point of one specimen on an unmarked surface of another specimen and attempting to produce a scratch.
Diffraction:
Diffraction<span> describes how waves bend, or change direction, as they travel around the edges of obstacles. </span>Diffraction<span> occurs in water waves, </span>sound <span>waves, and light waves, but the amount of </span>diffraction <span>depends on the size of the obstacle or opening in relation to the wavelength of the wave.</span>
