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4 years ago

Which of these pairs of elements is most likely to be part of a polyatomic ion?

Chemistry

2 answers:

Solnce55 [7]4 years ago

5 0

Answer: Option (d) is the correct answer.

Explanation:

A polyatomic ion is defined as the ion formed by two or more number of atoms which actually covalently combine together.

This means that only non-metals combine covalently together as a covalent bond is formed by sharing of electrons.

For example, S and O atoms are covalent and they tend to form polyatomic ions when combine together.

Whereas K and F, Li and I, Mg and Br are all metals and non-metals. So, they will always form an ionic bond as the metal will transfer its valence electrons to the non-metal.

Thus, we can conclude that out of the given options S and O pairs of elements is most likely to be part of a polyatomic ion.

Mrrafil [7]4 years ago

3 0

S and O would be on a polyatomic ion as I know of

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Answer:

Explanation:

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3 years ago

Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n

Gre4nikov [31]

Answer:

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

Explanation:

The energy of nth energy levels of the H atom is given as:

$E_n = -2.18 \times 10^{-18} \times \frac{1}{n^2} J$

Energy of the seventh energy level = $E_7$

$E_7=-2.18 \times 10^{-18} \times \frac{1}{7^2} J$

$E_7=-2.18 \times 10^{-18} \times \frac{1}{7^2} J=-4.4490\times 10^{-20} J$

Energy of the seventh energy level = $E_4$

$E_4=-2.18 \times 10^{-18} \times \frac{1}{4^2} J$

$E_4=-2.18 \times 10^{-18} \times \frac{1}{16} J=-1.3625\times 10^{-19} J$

Energy of the light emitted will be equal to the energy difference of the both levels.

$E=E_7-E_4=-4.4490\times 10^{-20} J-(-1.3625\times 10^{-19} J)$

$E=9.176\times 10^{-20} J$

Wavelength corresponding to energy E can be calculated by using Planck's equation:

$E=\frac{hc}{\lambda }$

$\lambda =\frac{hc}{E}=\frac{6.626\times 10^{-34} Js\times 3\times 10^8 m/s}{9.176\times 10^{-20} J}=2.166\times 10^{-6} m=2166 nm$

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

8 0

3 years ago

Identify the arrows that show removal of thermal energy when matter changes state.

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When matter loses heat, one of the following happens:
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Gas changes to solid (deposition)

1- Freezing: when the temperature of a liquid matter drops below its freezing point, the liquid usually solidifies forming crystals. Example of this is when water changes to ice
2- Condensation: when the temperature of gas is reduced, the molecules slow down and come together changing the matter into liquid. Example of this is when water vapor condenses into water droplets.
3- Deposition: Sometimes when the temperature of a gas drops, it solidifies directly without passing through the liquid phase. An example of this is when water vapor changes directly to ice in sub-freezing areas without passing through the liquid phase. This is the process through which clouds are formed.
The diagram below shows these three changes in matter.

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4 years ago

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3 years ago

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