Which graphic below shows the correct orientation of each water molecule when it is near the cl- ion in the aqueous solution?
1 answer:
The question is missing the graphics required to answer which I have attached as an image.
There are four different representations of the orientation of water molecules around chloride anion. Let's first analyze the water molecule.
We have H-O-H as the structure of water. The oxygen atom is more electronegative than the hydrogen atoms, which results in a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.
The chloride anion is a negative charge. Therefore, the water molecules should orient themselves with the hydrogen atoms facing the chlorine atom as the partial positive charge on the hydrogen atoms will be attracted to the negative charge of the chlorine atom.
The correct representation is shown in graph 3 which shows all hydrogen atoms facing the chlorine anion.
There are four different representations of the orientation of water molecules around chloride anion. Let's first analyze the water molecule.
We have H-O-H as the structure of water. The oxygen atom is more electronegative than the hydrogen atoms, which results in a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom.
The chloride anion is a negative charge. Therefore, the water molecules should orient themselves with the hydrogen atoms facing the chlorine atom as the partial positive charge on the hydrogen atoms will be attracted to the negative charge of the chlorine atom.
The correct representation is shown in graph 3 which shows all hydrogen atoms facing the chlorine anion.
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Answer:
Explanation:
We are asked to find how many atoms are in 8.88 grams of silicon.
<h3>1. Grams to Moles </h3>First, we convert grams to moles. We use the molar mass or the mass of 1 mole of a substance. These values are found on the Periodic Table as they are equal to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up silicon's molar mass.
- Si: 28.085 g/mol
We will convert using dimensional analysis. Set up a conversion factor with the molar mass.
We are converting 8.88 grams of silicon to moles, so we multiply by this value.
Flip the fraction so the units of grams of silicon cancel.
Next, we convert moles to atoms. We use Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are atoms of silicon.
Set up another conversion factor.
Multiply by the number of moles we calculated.
The units of moles of silicon cancel.
The original measurement of 8.88 grams has 3 significant figures, so our answer must have the same.
For the number we calculated, that is the hundredth place. The 4 in the thousandth place tells us to leave the 0 in the hundredth place.
<u>8.88 grams of silicon contains 1.90 ×10²³ atoms of silicon.</u>