Answer: The substance is in the gas phase only in region 5
The substance is in both the liquid and the solid phase in region 2
The substance is in only the liquid phase in region 3
The melting point is the temperature at region 2
The boiling point is the temperature at region 4
Explanation:
Answer:
Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.
Explanation:
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Answer:
The net energy is 2.196 eV
Explanation:
Basically, the energy of an atom increases when it absorbs a photon. In addition, the wavelength of the emitted photon is longer such that the atom absorbed a net energy in the process.
Using:
ΔE = h*c*(1/λ - 1/λ)
where:
ΔE is the net energy in eV (electron-volt). 1 eV is equivalent to 1.602* J.
h = 4.135* eVs
c = 3* m/s
λ = 300 nm = 300* m
λ = 640 nm = 640* m
Thus:
ΔE = 4.135* eVs*3* m/s*()
ΔE = 4.135**3**1.77* eV = 2.196 eV
The magnesium dissolves to form magnesium chloride and hydrogen gas is released.
Mg + 2HCl -----> MgCl2 + H2(g).