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jekas [21]
3 years ago
13

pure substance x is a green powder. when heated, it gives off a gas and changes to a black powder. is substance x an element or

a compound? give reasons
Chemistry
1 answer:
gogolik [260]3 years ago
7 0

I'd say it is an element. It is not a compound, it doesn't do things on its own like us. It's an element like fire and water.

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D. all of the above would be your answer!
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At 25 celsius, 1.00 ,ole of O2 was found to occupy a volume of 12.5 L at a pressure of 198 kPa. What value of the gas constant i
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Answer:

R=8.301\frac{L*kPa}{mol*K}

Explanation:

Hello,

In this case, assuming oxygen as an ideal gas, it is described by:

PV=nRT

Whereas the gas constant R is required, therefore, it is computed as shown below:

R=\frac{PV}{nT} =\frac{198kPa*12.5L}{1.00mol*(25+273.15)K} \\\\R=8.301\frac{L*kPa}{mol*K}

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Katyanochek1 [597]

Answer:

hi there !!

B) Water evaporates into steam.

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4 0
3 years ago
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irga5000 [103]

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The role of a spark plug is to supply some of the energy of activation for the combustion reaction.

<u>Explanation:</u>

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