Chemistry, 10.11.2019 03:31 chrisholmes176
In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. when the water is exposed to air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. what makes this process a chemical change?
a. a new substance is formed in this process, which is an important clue to chemical change.
b. a change in state is observed in this process, which is an important clue to chemical change.
c. this process involves separation of dissolved substances, which is an an important clue to chemical change.
d. this process involves dissolving substances together, which is an an important clue to chemical change.
e. this process involves breaking and reshaping of substances, which is an an important clue to chemical change.
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Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .
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Working with si (metric) units for each of the following commonly used measurements, indicate its symbol. liter gram milliliter kilogram meter centigram milligram centimeter kilometer second millimeter milliseconds
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In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites....
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