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2 years ago

The resistance of a wire is not dependent on

Chemistry

2 answers:

Cloud [144]2 years ago

7 0

Answer: D) current

Explanation:

Resistance is the opposing force to the motion of the charges which constitute current.

The resistance increases with increase in temperature and length of the wire but decreases with the diameter.

It does not depend on the current.

Resistance is given by:

$R =\frac{\rho l}{A}=\frac{4\rho l}{\pi d^2}$

where, ρ is the resistivity, l is the length of the wire, A is the area of cross-section and d is the diameter.

Other then these factors, the resistance increases with increase in temperature. This is because at higher temperature, the collision between electrons positive kernels increases which restricts the motion of electrons. This increases the resistance.

Neko [114]2 years ago

3 0

D). Current Hope this will help

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Which of the following solutes will lower the freezing point of water the most? NaCl, CaCl2!or AlBr3

MA_775_DIABLO [31]

This uses the concept of freezing point depression. When faced with this issue, we use the following equation:
ΔT = i·Kf·m
which translates in english to:
Change in freezing point = vant hoff factor * molal freezing point depression constant * molality of solution
Because the freezing point depression is a colligative property, it does not depend on the identity of the molecules, just the number of them.
Now, we know that molality will be constant, and Kf will be constant, so our only unknown is "i", or the van't hoff factor.
The van't hoff factor is the number of atoms that dissociate from each individual molecule. The higher the van't hoff factor, the more depressed the freezing point will be.
NaCl will dissociate into Na+ and Cl-, so it has i = 2
CaCl2 will dissociate into Ca2+ and 2 Cl-, so it has i = 3
AlBr3 will dissociate into Al3+ and 3 Br-, so it has i = 4
Therefore, AlBr3 will lower the freezing point of water the most.

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Scale and measuring tape.
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Answer with Explanation:

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goldenfox [79]

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