Answer:
A. H2O
Explanation:
Let us first define the three types of bonds:
1. Nonpolar Covalent: electronegativity difference < 0.4
2. Polar Covalent: electronegativity difference between 0.4 and 1.8
3. Ionic: electronegativity difference > 1.8
This will help us eliminate choices C and D:
-NaCl has a electronegativity difference of 3.0 - 0.9 = 2.1 (ionic bond)
-Cl2 has a electronegativity difference of 3.0 - 3.0 = 0 (nonpolar covalent bond)
However, we still have two more options, A and B, but they are not diatomic for us to use the electronegativity differences with.
We must now consult their geometries. Because CO2 has a linear geometry (O=C=O), the two sides will cancel each other out, resulting in a nonpolar covalent bond. At this point, by process of elimination, we can already determine the answer to be A. H2O. We can verify this by looking at the geometry of H2O, which is bent (H-O-H; imagine the O is above the H's, I cannot draw it in this response). H2O's bent geometry classifies it as polar covalent; the electrons are slightly more attracted towards the O, the more electronegative element. Side note: this makes the O slightly more negative in charge, whilst the H's are slightly more positive in charge.
P.S. I apologize for not being able to draw and demonstrate that last paragraph, but I hope you get a general idea. You can search up the "H2O geometry" and "CO2 geometry" to get a better idea! :)
You know that one side of the moon always faces us. So you’d have to be on that side to see any Earth at all. But from any part of the moon’s near side, you could see Earth wax and wane – just as the moon does as seen from our world. Both the Earth and the moon are always half illuminated by the sun. But from either world, at any given time, you can see varying portions of that lighted half – or various phases of the Earth or moon.
Given the data from the question, the number of aluminum atoms in aluminum oxide, Al₂O₃ is 2 (Option B)
<h3>Composition of aluminum oxide, Al₂O₃</h3>
From the formula of the compound, Al₂O₃ we see that the compound is composed of
<h3>How to determine the number of aluminum atoms </h3>
- Formula of compound = Al₂O₃
- Number of oxygen atoms j= 3 × 1 = 3
- Number of aluminum atoms = 2 × 1 = 2
From the above, we can conclude that Al₂O₃ contains 2 atoms of aluminum.
Learn more about mass composition:
brainly.com/question/11617445
The fully balanced equation would be
4Fe + 3O2 --> 2Fe2O3
for each side, we have
4 Fe (4 iron)
6 Oxygen (O)
So the final answer is choice B) 3