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Len [333]
4 years ago
8

Which of the following statements are TRUE concerning this laboratory exercise - The systematic identification of an organic com

pound ?
True False Your compound , when you receive it , may be impure , ie. a component of a mixture.
True False Your unknown may be a solid, liquid, or gas.
True False Your compound will contain at least C , H and oxygen and one or more of several other possible elements such as N , one or more halogens, S and Se.
True False In a "real world" situation, the compound could be one of several million possible known organic compounds.
True False You can use spectroscopic results to indicate the appropriate chemical tests to perform.
Chemistry
1 answer:
emmainna [20.7K]4 years ago
5 0

Answer:

True;

True;

False;

True;

True.

Explanation:

Organic compounds can be found pure, but generally, they are in mixtures, such as the petroleum, so it is possible to the compound received be impure;

Organic compounds can be found in the three states: solid, liquid or gas. The state will depend on the molecular forces in it and its molar mass. For example, gasoline is liquid in the ambient temperature, natural gas is a gas, and the glucose is solid;

The main characteristic of the organic compounds is the presence of C and H, the other elements can or can't be in the structure: O, N, halogens, and S;

Because of the carbon can form chains, there are several million possible known organic compounds;

The spectroscopic would give some results such as composition, molar mass, and diffraction, and with these results, it would be possible to identify some chemical properties and the tests needs more identification.

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2 years ago
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When 10.7 g of Al are reacted with 42.5 g of HCl, what volume of H2 will be produced at 47 C and 725 mmHg?
Georgia [21]
1) Write the balanced chemical equation:

2Al + 6HCl ---> 2AlCl3 + 3H2

2) Calculate the molar masses of Al and HCl and use them to convert the data to moles


Al: 27g/mol => 10.7 gAl / 27g/mol = 0.396 mol Al

HCl: 1g/mol + 35.5 g/mol = 36.5g/mol => 42.5gHCl / 36.5g/mol = 1.164 mol HCl

Theoretical ratio: 6 mol HCl / 2 mol Al = 3:1

Actual ratio: 1.164 mol HCl / 0.396 mol Al = 2.94 : 1

Then there is a little bit less HCl than the predicted by theoretical ratio, which means that this is the limitant reagent.

3) Use the amount of HCl to make the calculations of the proucts obtained.

Theoretical ratio: 3 mol H2 / 6 mol HCl = 1:3

1.164 mol HCl * 1 mol H2 / 3 mol HCl = 0.388 mol H2

4) Use the ideal gas formula to obtain the volume

pV = n RT

p = 725 mmHg * 1atm / 760mmHg = 0.954 atm
n = 0.388 mol
R = 0.082 atm*liter /K*mol
T = 47 °C + 273.15 = 320.15K

V = nRT/p = 0.388 mol * 0.082 [atm*liter/K*mol] * 320.15K / 0.954 atm = 10.7 liter

Answer: 10.7 liter
 


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3 years ago
Is hardness a property and explain how you know
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Answer: Yes, It is, because hardness is a property for Physical Properties, not chemical properties!

:D

Explanation:

Hopefully i helped, (mark me brainliest plz)

7 0
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