The majority of elements in the Periodic Table are metallic. Does this mean that most minerals are metallic?
What will be an ideal response?
Answer: Although the different metallic elements combine and give us minerals, not all minerals made up of these metallic elements make metallic minerals. Properties of the single elements are very different from the properties of the compounds of elements. For example, the elements Na and Cl combine to form the compound NaCl. Whereas elemental sodium is a soft silvery metal, and elemental chlorine is a toxic yellow-green gas, when the two elements are combined they form common table salt, NaCl (the mineral halite). Although composed of metallic elements, halite is not considered to be a metallic mineral.
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What role does entropy play in chemical reactions?
A) The entropy determines how much product will actually be produced. B) The entropy change determines whether the reaction will be exothermic or endothermic. C) The entropy change determines whether the reaction will occur spontaneously or not. D) The entropy change determines whether or not the chemical reaction is favorable.
What causes spherical aberration?
A. the lens surface is not perfectly smooth B. the outer edges of the lens produce a focus at a different point than the central rays C. light is an electromagnetic wave with intrinsic diffraction properties D. the absorption of light in the glass is a function of wavelength
The luminosity of a star allows astronomers to determine the radius and distance of the star.
Answer the following statement true (T) or false (F)
In many metal machining operations (cutting or turning) the contact surface at the interface of the tool and metal part is cooled by a liquid coolant that is delivered on the surface by a single round jet. Water at 25°C is used as coolant in one such jet-cooling system, and it flows at the rate of 0.01 kg/s through a circular nozzle with a diameter of 3.0 mm. Determine the average heat transfer coefficient and the rate of cooling from a 5 mm region on the surface of the part being machined. The surface temperature in this area is at 40°C.
GIVEN
FIND
Average heat transfer coefficient and rate of cooling from a 5 mm region on surface of part being
machined.