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alexandr1967 [171]
3 years ago
5

aluminum has a density or 2.7g/cm3. copper has a density of 8.96/cm3. which metal would you choose to build a model airplane?

Chemistry
1 answer:
erik [133]3 years ago
7 0

Answer: Aluminium

Explanation: Aluminium metal has a lower density than copper. So, for the same volume of metal used to build a model airplane, the aluminium plane would be very lightweight while that of copper would be heavy.  The lightweight airplane will fly easily.

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Answer:

D) Mg(s)

Explanation:

We are given:

E^o_{(Cl_2/Cl^-)}= 1.36V\\E^o_{(Mg^{2+}/Mg)}=-2.37V

The substance having highest positive E^o potential will always get reduced and will undergo reduction reaction. Here, chlorine will undergo reduction reaction will get reduced.  Magnesium will undergo oxidation reaction and will get oxidized.

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a bright violet line occurs at 435.8 nm in the emission spectrum of mercury vapor. What amount of energy, in joules, must be rel
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<h3>Answer:</h3>

4.56 × 10^-19 Joules

<h3>Explanation:</h3>

We are given;

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We are required to calculate the amount of energy released by an electron.

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Energy = 6.626 × 10^-34 J-s ×6.879 × 10^14 Hz

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