Magnesium burns with oxygen to give magnesium oxide based on the following reaction:
2M<span>g</span>+<span>O<span>2 </span></span>........> 2Mg<span>O<span>(s)</span></span>+<span>energy
</span>From the periodic table:
molecular mass of magnesium = 24.3 grams
molecular mass of oxygen = 16 grams
From the reaction:
2 x 24.3 = 48.6 grams of magnesium are required to produce 2(24.3+16) = 80.6 grams of magnesium oxide.
We can know the amount of magnesium oxide produced from 8 grams of magnesium by simply doing cross multiplication as follows:
amount of magnesium oxide = (8 x 80.6) / 48.6 = 13.267 grams
Answer: <span>C) Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.</span>
Explanation:
1) This is the set of choices that comes with this question:
<span>A) Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.</span>
<span>B) Soap makes the water less viscous making the paperclip sink.</span>
<span>C) Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.</span>
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D) Soap makes the water more viscous allowing the paperclip to continue to float.
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2) Justification:
The paperclip is denser that water, so it should sink into the water. Then, why is the paperclip floating?
The papeclip is floating due to the high surface tension of the water.
The surface tension is the force that tends to keep the molecules of a liquid together resisting the spread due to other forces (gravity for example). The surface tension is what makes that a drop of water over a table keeps round and like a hemisphere instead of spreading along all the surface of the table.
That very same force makes it possible that some insects can stand over water and is the responsible for the meniscus that you see in the thin tubes that contain water (e.g. in the test tubes in your chemistry lab).
By the way, that strong intermolecular forces that keep the molecules of water attracted to each other is due the hydrogen bonds.
The soap is a surfactant which reduces the surface tension of the water, this is it disrupts the intermolecular forces of water, and that is what the option C) tells.
I think the answer is B. Can you give me brainliest? Ty!