It will stay at a constant temperature while it is boiling which is 212°F
Energy can make matter do all of the above, so D
Answer:

Explanation:
Hello!
In this case, since the density is defined as the degree of compactness of a substance, and is defined as the mass over the volume:

Given the dimensions of the bar of lead, we can compute the volume as shown below:

Thus, the density turns out:

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Answer:

Explanation:
Hello there!
In this case, since there is a 2:2 mole ratio between sodium peroxide and water according to the given reaction, it is possible to apply the following stoichiometric setup for the calculation of the required mass of water:

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Energy E = hc / l
where h = Planck's constant, c = speed of light and l = wavelength.
E = 1.986 * 10^-25 / 3.8 * 10^-7 = 5.223*10^-19