Answer & Explanation:
The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.2) ALL zeroes between non-zero numbers are ALWAYS significant.3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.<span>4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.
so it will be 11.76 = 12 bc 7 rounds up
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This is a characteristic of a Thermosetting polymer.
Answer:
The over all reaction :
The standard cell potential of the reaction is 0,.897 Volts.
Explanation:
Reduction at cathode :
..[1]
![E^o_{Fe^{3+}/Fe^{2+}}=0.771 V](https://tex.z-dn.net/?f=E%5Eo_%7BFe%5E%7B3%2B%7D%2FFe%5E%7B2%2B%7D%7D%3D0.771%20V)
Reduction potential of
to ![Fe^{2+}=0.771 V](https://tex.z-dn.net/?f=Fe%5E%7B2%2B%7D%3D0.771%20V)
Oxidation at anode:
.[2]
![E^o_{Pb^{2+}/Pb}=-0.126 V](https://tex.z-dn.net/?f=E%5Eo_%7BPb%5E%7B2%2B%7D%2FPb%7D%3D-0.126%20V)
Reduction potential of
to ![Pb=-0.126 V](https://tex.z-dn.net/?f=Pb%3D-0.126%20V)
To calculate the
of the reaction, we use the equation:
![E^o_{cell}=E^o_{red,cathode}-E^o_{red,anode}](https://tex.z-dn.net/?f=E%5Eo_%7Bcell%7D%3DE%5Eo_%7Bred%2Ccathode%7D-E%5Eo_%7Bred%2Canode%7D)
Putting values in above equation, we get:
![E^o_{cell}=E^o_{Fe^{3+}/Fe^{2+}}-E^o_{Pb^{2+}/Pb}](https://tex.z-dn.net/?f=E%5Eo_%7Bcell%7D%3DE%5Eo_%7BFe%5E%7B3%2B%7D%2FFe%5E%7B2%2B%7D%7D-E%5Eo_%7BPb%5E%7B2%2B%7D%2FPb%7D)
![=0.771 V-(-0.126 )=0.897 V](https://tex.z-dn.net/?f=%3D0.771%20V-%28-0.126%20%29%3D0.897%20V)
The over all reaction : 2 × [1] + [2]
The standard cell potential of the reaction is 0,.897 Volts.