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Anettt [7]
2 years ago
7

Which of the following is an element?

Chemistry
2 answers:
Natasha_Volkova [10]2 years ago
6 0

Answer:

zinc metal (ZN) is an element

Naddika [18.5K]2 years ago
5 0
It’s D. Zinc Metal (Zn)
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What are the various adverse effects of chemistry​
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<u>Answer:</u>

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It has been suggested that the surface melting of ice plays a role in enabling speed skaters to achieve peak performance. Carry
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Explanation:

Relation between pressure, latent heat of fusion, and change in volume is as follows.

          \frac{dP}{dT} = \frac{L}{T \times \Delta V}

Also, \frac{L}{T} = \Delta S^{fusion}_{m}

where, \Delta V^{fusion}_{m} is the difference in specific volumes.

Hence,    \frac{dP}{dT} = \frac{\Delta S^{fusion}_{m}}{\Delta V^{fusion}_{m}}

As, \Delta S^{fusion}_{m} = \frac{L}{T} = \frac{6010}{273.15} = 22.0 J/mol K

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where,    d_{H_{2}O} = density of water

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             M = molar mass of water = 18.02 \times 10^{-3} kg

Therefore, using formula in equation (1) we will calculate the volume of fusion as follows.

        \Delta V^{fusion}_{m} = \frac{M}{d_{H_{2}O}} - \frac{M}{d_{ice}}

                       = \frac{18.02 \times 10^{-3}}{997} - \frac{18.02 \times 10^{-3}}{920}  

                       = -1.51 \times 10^{-6}        

Therefore, calculate the required pressure as follows.

              \frac{dP}{dT} = \frac{22}{-1.51 \times 10^{-6}}

                              = 1.45 \times 10^{7} Pa/K

or,                           = 145 bar/K

Hence, for change of 1 degree pressure the decrease is 145 bar  and for 4.7 degree change dP = 145 \times 4.7 bar

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Thus, we can conclude that pressure should be increased by 681.5 bar to cause 4.7 degree change in melting point.

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