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exis [7]
3 years ago
11

what occurs in a chemical reaction? A. Reactants are formed without chemical bonds being broken B. Reactants are formed from pro

ducts by the breaking and forming of bonds C. Products are formed without chemical bonds being broken D. Products are formed from reactants by the breaking and forming of new bonds
Physics
2 answers:
Ann [662]3 years ago
3 0
The answer is D. Products are formed from reactants by the breaking and forming of new bonds. 
tekilochka [14]3 years ago
3 0
The correct answer would be D also
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If you weighted 130 lbs on Earth how much would you weigh on the moon?
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The membrane that surrounds a certain type of living cell has a surface area of 5.1 x 10-9 m2 and a thickness of 1.4 x 10-8 m.
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a) The charge on the outer surface is 1.2\cdot 10^{-12} C

b) The number of ions is 7.5\cdot 10^6

Explanation:

a)

The membrane behaves as a parallel plate capacitor, whose capacity is given by the equation

C=\frac{k\epsilon_0 A}{d}

where

k = 4.3 is the dielectric constant

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d=1.4\cdot 10^{-8} m is the distance between the two plates

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C=\frac{(4.3)(8.85\cdot 10^{-12})(5.1\cdot 10^{-9})}{1.4\cdot 10^{-8}}=1.4\cdot 10^{-11} F

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C=\frac{Q}{\Delta V}

where here we have

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\Delta V = 85.5 mV = 0.0855 V is the potential difference between the two surfaces

Solving for Q, we find

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b)

We said that the net charge on the outer surface is

Q=1.2\cdot 10^{-12} C

The charge of one K+ ions is equal to the electron charge

+e=1.6\cdot 10^{-19} C

Therefore, the number of ions on the outer surface can be found by dividing the total charge by the charge of a single ion:

N=\frac{Q}{e}=\frac{1.2\cdot 10^{-12}}{1.6\cdot 10^{-19}}=7.5\cdot 10^6

Learn more about capacity:

brainly.com/question/10427437

brainly.com/question/8892837

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Rubber is an insulator
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