Physics
Physics, 28.06.2019 11:40, fanta47

Why do graphite and diamond look different even though they are from the same element?

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Biology, 26.06.2019 18:00, shamiya15
Gary has a piece of diamond and a piece of graphite. he wants to test the hardness of these two minerals. when he rubs the diamond against the piece of graphite, the graphite gets scratched. when he rubs the piece of graphite against the diamond, the diamond does not get scratched. which of these is true? a. the graphite is harder than the diamond. b. this test does not show which mineral is harder. c. the diamond is harder than the graphite. d. both minerals have the same hardness.
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Chemistry, 03.09.2019 03:20, leannesmith90101
Both graphite and diamond burn. c(s, diamond ) + o2 ? co2 for the conversation of graphite to diamond c(s, graphite )? c(s, diamond) h298 = 190kj which produces more heat, the combustion of graphite for the combustion od daimond
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Chemistry, 01.10.2019 18:10, johnnyaby69
6. diamond and graphite are both composed of carbon atoms. the density of diamond is 3.52g/cm3. the density of graphite is 2.25g/cm3. in 1955, scientists successfully made diamond from graphite. using the relative densities imagine what happens at the atomic level when this change occurs. then suggest how this synthesis may have been accomplished.
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Chemistry, 26.10.2019 02:43, jay3676
For reactions in condensed phases (liquids and solids), the difference between δh and δu is usually quite small. this statement holds for reactions carried out under atmospheric conditions. for certain geochemical processes, however, the external pressure may be so great that δh and δu can differ by a significant amount. a well-known example is the slow conversion of graphite to diamond under earth's surface. calculate δh − δu for the conversion of 1 mole of graphite to 1 mole of diamond at a pressure of 4.00 x 10^4 atm. the densities of graphite and diamond are 2.25 g/cm^3 and 3.52 g/cm^3, respectively. kj/ mol ?
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