Which statement best describes an O3 molecule?<br> ► View Available Hint(s)

Which statement about biogeochemical cycles is true?

Marianna [84]

The answer would be C!!!!!!!!!!!!!!!!!!

4 0

2 years ago

How does Bohr's theory explarn the hydrogen spectra? Name the different

vladimir1956 [14]

Answer:

Bohr's model explains the spectral lines of the hydrogen atomic emission spectrum. While the electron of the atom remains in the ground state, its energy in uncharged. When the atom absorbs one or more quanta of energy, the electron moves from the ground state orbit to an excited stats orbit that is further away. Energy levels are designated with the variable n. The ground state is n =1, the first excited state is n = 2, and so on. The energy that is gained by the atom is equal to the difference in energy between the two energy levels. When the atom relaxes back to a lower energy state, it releases energy that is again equal to the difference in energy of the two orbits.

8 0

2 years ago

In the treatment of domestic water supplies, chlorine is added to the water to form chloric(I) acid,HClO.

Naya [18.7K]

Chlorine goes from Cl₂ to ClO⁻.

Oxidation state of Cl in Cl₂ is zero whereas in ClO⁻ it is +1. Hence change in oxidation state of Chlorine is 1.

Calculation of oxidation number of Cl in ClO⁻ or HClO⁻ :
Let x be oxidation number of Cl in ClO⁻ the. Now since the net charge on ClO⁻ is -1, sum of oxidation number of all must be equal to -1.

Therefore,
x + (-2) = -1 .....[ oxidation number of O is -2]
∴ x = 2-1 = +1
Therefore oxidation number of Cl in ClO⁻ is +1

8 0

3 years ago

Use the given information to determine the enthalpy of the reaction

arlik [135]

The question is incomplete, here is the complete question.

Consider these reactions, where M represents a generic metal.

1. $2M(s)+6HCl(aq)\rightarrow 2MCl_3(aq)+3H_2(g)$ ; ΔH = -783 kJ

2. $HCl(g)\rightarrow HCl(aq)$ ; ΔH = -74.8 kJ

3. $H_2(g)+Cl_2(g)\rightarrow 2HCl(g)$ ; ΔH = -1845 kJ

4. $MCl_3(s)\rightarrow MCl_3(aq)$ ; ΔH = -195 kJ

Use the information above to determine the enthalpy of the following reaction.

$2M(s)+3Cl_2(g)\rightarrow 2MCl_3(s)$ ; ΔH=?

Answer : The enthalpy for the reaction is, -6376.8 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

Now we have to determine the enthalpy of the reaction.

Multiplying reaction 2 by 6, reaction 3 by 3 and reverse reaction 4 by 2 then adding all the reaction, we get:

1. $2M(s)+6HCl(aq)\rightarrow 2MCl_3(aq)+3H_2(g)$ ; ΔH = -783 kJ

2. $6HCl(g)\rightarrow 6HCl(aq)$ ; ΔH = 6 × (-74.8 kJ) = -448.8 kJ