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umka21 [38]
2 years ago
11

Mechanical waves travel fastest through A -Solid B -Liquid C -Gas D -Vacuum

Chemistry
1 answer:
GalinKa [24]2 years ago
8 0

Answer:

A-Solid

Explanation:

Waves travel faster in solids & slowest in gases

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The lowest energy state an atom can be at is called its ground state. When an electron in an atom has absorbed energy it is said to be in an excited state. An excited atom is unstable and tends to rearrange itself to return to its lowest energy state. When this happens, the electrons lose some or all of the excess energy by emitting light. Light is only emitted at certain frequencies, each corresponding to a particular electronic transition within the allowed states.

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Limestone stalactites and stalagmites are formed in caves by the following reaction: Ca2 (aq) 2HCO−3(aq)→CaCO3(s) CO2(g) H2O(l)
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Answer : The value of \Delta E for this reaction is 36.18 kJ

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