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ahrayia [7]
1 year ago
15

What does the following energy diagram represent?A. Activation energyB. Exothermic reactionC. Specific heat capacityD. Endotherm

ic reaction

Chemistry
1 answer:
inn [45]1 year ago
8 0

Explanation:

We are given the following diagram.

In this diagram we can see how the energy in the reaction changes over time. The energy of the products is greater than the energy of the reactants. That means that the products have won some energy. That represents an endothermic reaction where the reactants absorb energy from the surrounding to form the products.

Answer: D. Endothermic reaction.

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Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n
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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
What is the mass, in grams, of two liters of water?
erma4kov [3.2K]
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So that means that 2 litres of water = 2000 grams
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Necesito ayuda con esto y si es necesario con procedimientos, gracias
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Answer:

sorry but I don't understand Spanish

otherwise I will definitely helps you

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