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Dmitry_Shevchenko [17]
3 years ago
15

Describe how gasoline, as a fuel, can undergo a chemical change.

Chemistry
1 answer:
kvasek [131]3 years ago
5 0

Answer with Explanation:

A "chemical change" occurs when the structure of the molecules change. If there's no change in structure, it is called a "physical change." This also means that a <em>chemical reaction </em>has to occur for something to be considered a chemical change.

Gasoline when used as a fuel is being transformed into other forms of energy. It undergoes a process called <em>"combustion."</em>

When used as a fuel for cars, <em>the gasoline is being burned to produce </em><u><em>heat energy.</em></u> This energy is then converted into <u><em>mechanical energy</em></u> that allows the car to move. Clearly, the gasoline has undergone a chemical change.

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EXPERIMENT: DETERMINING VOLUME
Tanzania [10]

Explanation:

(Ques- A) Why does the first method for determining volume work only for a regular-shaped object?

<u>(Ans- A)</u> <em>Because the method requires precise dimensions of objects for result, which is not possible for irregular shaped objects.</em>

(Ques - B) Will the second method for determining volume work for any object or just an odd-shaped one? Why?

<u>(Ans-B)</u> <em>It will work for both regular and irregular shaped objects since both displace equal volumes of water.</em>

(Ques - C) Is one method of measurement more accurate than the other? Why or why not?

<u>(Ans-C)</u> <em>Both are pretty accurate, with some experimental errors which may creep in accidentally. </em>

(Ques- D) Would the displacement method of measurement work for a cube of sugar? What about a cork? Why?

<u>(Ans - D)</u> <em>No, the method would not work because sugar being soluble, will dissolve in water. </em>

<em>No, the method would not work because sugar being soluble, will dissolve in water. Cork is less dense than water so floats on it, with only part of it submerged in water, resulting in displacement of less volume of water than actual volume of Cork.</em>

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3 years ago
You are given 24.3 grams of Mg and combine it with 32.1 grams of Sulfur, what is the mass of MgS? *
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molar mass = 24.3 + 2 (16) + 2(1.0)

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So the mass is then:

mass = 3.2 mol * (58.3 g/mol)

mass = 186.56 gramsn:

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2 years ago
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