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dsp73
3 years ago
8

Which piece of evidence would suggest an unknown substance is an ionic compound? it conducts electricity when dissolved in water

. it is a liquid at room temperature. it has a low melting point. it is a gas at room temperature.
Chemistry
2 answers:
Nikolay [14]3 years ago
7 0

It conducts electricity when dissolved in water

LekaFEV [45]3 years ago
3 0

The correct answer is the first option. The piece of evidence would suggest an unknown substance is an ionic compound is that <span>it conducts electricity when dissolved in water.</span><span>  A</span><span>n ionic compound dissociates into ions when in aqueous solution. These ions move freely in the solution and can allow the flow of electricity into the solution.</span>

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Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron fallsfrom the n = 7 to the n
Helga [31]

Answer:

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

Explanation:

We recall that Eₙ=\frac{-2.18*10^{-18} J}{n^{2} }

since there was transition from n7 to n=4 we will first calculate the change in the energy i.e ΔE

ΔE=E₄-E₇

ΔE=-2.18*10^{-18} J(\frac{1}{4^{2} } -\frac{1}{7^{2} } )

ΔE=-9.1760*10^-20 J

Now:

|ΔE|=Energy of photon=h*v=h*c/λ

λ=h*c/|ΔE|

λ=\frac{6.63*10^{-34}J.s*3.00*10^{8}m/s  }{9.1760*10^{-20} J }

λ=2.1676*10^-6 m

λ=2167.6*10^-9 m

λ=2167.6 nm

The wavelength of light emitted is 2167.6 nm.

5 0
3 years ago
Can someone please help me?
irina [24]
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3 0
3 years ago
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What changes in color occur when bromine reacts with an alkene​
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Answer:

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3 years ago
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A block of ice is cooled from -0.5 degrees Celsius to -10.1 degrees Celsius. Calculate the temperature change, delta T, in degre
ss7ja [257]
Delta T= T final - T initial
Tfinal= -101.1 °C
Tinitial= -0.5 °C
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3 0
3 years ago
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