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mars1129 [50]
3 years ago
6

How many significant digits are there in the measurement of 9478.983560 cm

Chemistry
1 answer:
motikmotik3 years ago
6 0

Hi,


There are 10 significant digits in the measurement of 9478.983560 cm. A significant number is a number that is not a zero, however, in this problem you see there is one zero and that counts as a significant number because it is after a whole number.


In conclusion, a significant number is a number that is not a zero, however the only exception to this rule is that it must be after a whole number for it it to count as significant.



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What is oxidized in a galvanic cell with aluminum and gold electrodes ?
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Answer:

Aluminum metal

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Since one half-equation should be an oxidation reaction (oxidation is loss of electrons) and one should be a reduction reaction (reduction is gain of electrons), one of these should be reversed.

Thinking simply, if the overall cell potential would be obtained by adding the two potentials, in order to acquite a positive number in the sum of potentials, we may only reverse the half-equation of aluminum (this would change the sign of E to positive):Al\rightarrow Al^{3+}+3e^-; E^o=1.66 V\\Au^{3+}+3e^-\rightarrow Au; E^o=1.50 V

Notice that the overall cell potential upon summing is:

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2 years ago
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Answer:

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Hello there!

In this case, given the T-V variation, we understand it is possible to apply the Charles' law as shown below:

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Thus, since we are interested in the initial temperature, we can solve for T1, plug in the volumes and use T2 in kelvins:

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Best regards!

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