Answer:
Zero with the subscripts, +2 without them.
Explanation:
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In this case, since we consider that two silicon are bonded with four oxygen atoms to form silicon oxide according to the following chemical equation:
It is also possible to realize it can be simplified to obtain:
Which means that the total charge with the subscripts is zero, and without the subscripts +2 (+4-2).
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Answer: -
If a gas at 250 K has a pressure of 0.00008 Pa and the pressure drops to 0.00002 Pa, 62.5 K is the new temperature
Explanation: -
Initial Pressure P₁ = 0.00008 Pa
Final Pressure P₂ = 0.00002 Pa
Initial Temperature T₁ = 250 K
Since the volume is not mentioned, it remains constant.
So initial Volume V₁ = Final volume V₂
Now using the combined gas equation
=
Final Temperature T₂ =
Plugging in the values,
T₂ =
As V₂ = V₁, they cancel each other.
T₂ = 62.5 K
One propertie is that it's round.