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Tutor profile: Marwa Z.

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Marwa Z.
Research Assistant/PhD Student at Louisiana State University
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Questions

Subject: Inorganic Chemistry

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Question:

How can we determine the sample that is containing chloride ion where as we are given three samples containing chloride, bromide, and iodide ions separately?

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Marwa Z.
Answer:

Using silver nitrate solution, acidify the solution with dilute nitric acid . Add silver nitrate to the sample solution in three different test tubes, chloride ,bromide and iodide will form White insoluble precipitate Add ammonia solution to the precipitate bromine and iodide precipitate will be insoluble while chloride precipitate dissolve in ammonia solution.

Subject: Chemistry

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Question:

What is the easiest way to extract hydrogen from water and the safest way to store it?

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Marwa Z.
Answer:

Electrolysis (which means splitting using electricity) of water is the method for producing hydrogen from water.The safest way to commercially store it would be to use a palladium "sponge", because palladium adsorbs several hundred times it's own volume in hydrogen. One would need to produce a compound with a very high surface area which has a thin coating of palladium. This type of material is commonly used as a catalyst in chemical processes.

Subject: Materials Science

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Question:

In water, the bond angle between the H-O H-O bond is less than 109° Why? a) The H atoms attract each other b) Oxygen atom is much larger than Hydrogen atoms c) Lone pair-bond pair repulsion is greater than bond pair-bond pair repulsion d) VSEPR theory does not apply for planar molecules like water

Inactive
Marwa Z.
Answer:

Answer: c Explanation: Bond angle is 109° for symmetric molecules like methane. However, it is known that repulsion between a lone pair and a bond pair is more than that between two bond pairs. Hence, bond angle is reduced from 109° so as to experience minimum repulsion from lone pairs.

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