D = m / V
D = 8.0 g / 25 cm³
D = 0.32 g/cm³
Answer A
<span><span>Law of Conservation of Mass - "The total mass after a chemical reaction is exactly the same as the mass before"</span></span><span>
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<span>There is a direct correlation between the period number and the energy level for valence electrons. For example, the H and He elements, in period 1, have their outer electrons in the energy level "1". This continues down the rows: all the elements in period 2 have their principal energy level as n = 2, period 3 has n = 3, and so on.</span>
To determine the amplitude of a transverse wave, measure the highest amount of disturbance from the equilibrium that the wave experiences.
