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# Tutor profile: Zahra A.

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Zahra A.
Tutor for five years
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## Questions

### Subject:Chemistry

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Question:

Describe what occurs during dipole–dipole interactions.

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Zahra A.

A dipole consists of a segment of a molecule with partial positive and partial negative regions. The positive end of one molecule is attracted to the negative end of another molecule, and vice-versa.

### Subject:Biology

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Question:

Some studies suggest that in patients with Alzheimer’s disease, there is a defect in the way the spindle apparatus attaches to the kinetochore fibers. At which stage of mitotic division would one first expect to be able to visualize this problem?

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Zahra A.

Prophase. The spindle apparatus first interacts with the kinetochore fibers near the end of prophase. While the spindle apparatus aligns the chromosomes at the equatorial plate during metaphase, the initial connection of the microtubule to the kinetochore occurs in prophase.

### Subject:Physics

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Question:

Silver has a melting point of 962°C and a heat of fusion of approximately 1.05 x 10^5 J/kg. The specific heat of silver is 233 J/kg. K. Approximately how much heat is required to completely melt a 1 kg silver chain with an initial temperature of 20°C?

Inactive
Zahra A.

Before melting the chain, we should first heat the chain to the melting point. To calculate how much heat is needed, we use this formula: q = mcΔT m is the mass, c is the specific heat of the substance, and ΔT is the change in temperature (in Celsius or kelvins). Remember that because the unit size for the Celsius and Kelvin scales is the same, the change in temperature will be the same for temperatures measured in Celsius or kelvins. So: q = (1 kg) (233 J/kg. K) (962 -20) = 219486 J This tells us we have to add approximatly 219 kJ of heat to the chain just to get its temperature to the melting point. The chain is still in the solid phase. To melt it, we must continue to add heat in accordance with this formula: q = mL= (1 kg) (1.05 x 10^5 J/kg) = 1.05 x 10^5 J The total heat needed to melt the solid silver chain is 219 kJ + 105 kJ = 324 kJ.

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