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RideAnS [48]
3 years ago
5

Which action best demonstrates the transformation of mechanical energy to heat energy?

Chemistry
2 answers:
vfiekz [6]3 years ago
7 0

wouldn't it be C because mechanical your moving your hands and then heat energy because of friction.

Marysya12 [62]3 years ago
6 0
I believe the answer is burning a candle
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Out of 500 silicon atoms: 460 are si-28, which has a mass of 27.98 amu 25 are si-29, which has a mass of 28.98 amu and 15 are si
liberstina [14]

Answer;

=28.09 amu

Explanation;

In this problem, they did not give us the percentages. However, since we know the number of atoms, we can easily calculate the percentages. For example:  

(460 X 100)/500 = 92%  

If we do this for all three isotopes,

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-We get 92%, 5%, and 3%. (We'll assume these are absolute numbers for determining our significant figures).

Now the problem is just like the previous one. First convert the percentages into decimals. Then multiply those decimals by the masses and add. Here's the solution:  

= (0.92) X (27.98 amu) + (0.05) X (28.98 amu) + (0.03) X (29.97 amu)

= 25.74 amu  +  1.449 amu  + 0.8991 amu

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