Answer:
False
Explanation:
The density of Interstellar dust is very low,yet it still blocks starlight because. .....the Dust emission nebulae like M42 occur only near star that emit large amount of. ......Hydrogen is the major gas in the interstellar medium.
The equilibrium means that amount that are coming equals the amount that are going.
So the correct answers are
2. A person's income and expenses are equal every month.
3. The pressure exerted on the inside of a balloon by the gas inside is equal to the pressure exerted on the outside of the balloon by the atmosphere.
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Answer:
(a) Chlorine atom
(b) 0
(c) 109.5°
(d) about the same
Explanation:
Perchlorate is a negatively charged molecule that is composed of one carbon atom and four oxygen atoms. In this molecule, the <em>central chlorine atom</em> that is present in +7 oxidation state, is covalently bonded to four oxygen atoms.
Thus the number of <u>bond pairs is 4</u> and the number of <u>lone pairs on the central chlorine atom is 0</u>.
So according to the VSEPR theory, perchlorate ion has a <em>tetrahedral geometry</em>. Therefore, the<em> </em><u>ideal bond angle for the perchlorate ion is 109.5°</u>.
<u>The actual bond angle of perchlorate is about the same as ideal bond angle.</u> This is because the perchlorate is <em>resonance stabilized</em> and thus all the chlorine-oxygen bonds are equivalent.