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ivann1987 [24]
3 years ago
12

30 POINTS TO WHOEVER CAN FIGURE IT OUT!!When is the sun directly overhead at the equator?

Chemistry
2 answers:
tresset_1 [31]3 years ago
8 0

Answer:

D

Explanation:

The sun is directly overhead at the equator during the vernal (usually March 20) and autumnal (around September 23) equinoxes.

Basically, what happens is that on these two days, day and night practically last for an equal number of hours.

Hope this helps!

Andre45 [30]3 years ago
3 0

Answer:

D) Vernal and autumnal equinoxes.

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What types of bonds or interactions are overcome when a nonmetal extended network melts?
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Covalent bonds or interactions are overcome when a nonmetal extended network melts.

Typically, nonmetals form covalent bonds with one another. A polyatomic ion's atoms are joined by a form of link called covalent bonding. A covalent bond requires two electrons, one from each of the two atoms that are connecting.

One technique to depict the formation of covalent connections between atoms is with Lewis dot formations. The number of unpaired electrons and the number of bonds that can be formed by each element are typically identical. Each element needs to share an unpaired electron in order to establish a covalent bond.

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2 years ago
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The vapor pressure of a substance is measured over a range of temperatures. A plot of the natural log of the vapor pressure vers
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Answer:

28.7664 kJ /mol

Explanation:

The expression for Clausius-Clapeyron Equation is shown below as:

\ln P = \dfrac{-\Delta{H_{vap}}}{RT} + c

Where,

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The graph of ln P and 1/T gives a slope of - ΔHvap/ R and intercept of c.

Given :

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- ΔHvap/ R = -3.46×10³ K

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<u></u>

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