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Effectus [21]
3 years ago
14

Fossil fuels are considered useful to humans because they are

Chemistry
2 answers:
Verdich [7]3 years ago
8 0
Fossil fuels are considered useful to humans because they are made by natural process by the decomposition of buried dead organisms. Coal, crude, oil And natural gas are fossil fuels that are the currently energy sources of the world.
ad-work [718]3 years ago
3 0

Fossil fuels are important because these products create fuel, gasoline for cars, jet fuel, heating oil and natural gas used to generate electricity.

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Indicate which of the following criteria are important for the selection of a buffer to use in an in vitro biochemical reaction.
JulsSmile [24]

Answer:

The correct answer is: d. The pKa of the chosen buffer should be close to the optimal pH for the biochemical reaction.

Explanation:

The buffer resist or maintain the change in pH in case of Acid or basic addition to the solution. The buffer capacity should be within one or two pH units when compared to the optimal pH.

Thus it is important to select a buffer with pKa close to the optimum pH of the reaction because the ability for the buffer to maintain the pH is is great at the pH close to pKa.

7 0
3 years ago
Why is isn’t it chemical change if you mixed paint together?
VashaNatasha [74]
There is no chemical change
8 0
3 years ago
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What do scientists use scientific notation for?
tamaranim1 [39]
Scientists use scientific notation to simplify numbers, basically. When dealing with really big numbers or really small numbers, the usage of scientific notation prevents them from having to write a bunch of zeroes.
Hope that helped you!
8 0
3 years ago
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The volume of a sample of nitrogen is 6.00 liters at 35oC and 0.75 atm. What volume will it occupy at STP?
joja [24]
The  volume that  will  occupy  at STP  is  calculated   as  follows
by use  of ideal  gas  equation
that is  PV=nRT  where n  is  number of  moles  calculate  number of moles

n= PV/RT
p=0.75 atm
V=6.0  L
R = 0.0821  L.atm/k.mol
T=  35  +273= 308k
n=?

n=  (o.75  atm  x  6.0 L)/( 0.0821 L.atm/k.mol  x 308 k)=  0.178 moles

Agt  STP  1 mole=  22.4 L  what obout  0.178 moles

=  22.4  x0.178moles/ 1moles =3.98 L( answer C)
3 0
3 years ago
Explain how nature of cathode rays does not depend on nature gas?​
Ilia_Sergeevich [38]

Answer:

The characteristics of cathode rays do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.

4 0
2 years ago
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