Which of the following is a single replacement reaction?Fe2O3 + 3H2O yields 2Fe(OH)3FeS + 2HCl yields FeCl2 + H2S
2Mg + O2 yields 2MgO
Mg + 2HCl yields MgCl2 + H2

Answer: Option (d) is the correct answer.

Explanation:

When people or group of people work collectively or work together in order to achieve a certain aim then it is known as collectivism.

In collectivization, people help each other.

Thus, we can conclude that it is important we work together on this project; we want our group to succeed.” This statement reflects collectivization.

Answer:

collectivization

Explanation:

Answer:

The wavelength of the emitted photon will be approximately 655 nm, which corresponds to the visible spectrum.

Explanation:

In order to answer this question, we need to recall Bohr's formula for the energy of each of the orbitals in the hydrogen atom:

, where:

[tex]m_{e}[tex] = electron mass

e = electron charge

[tex]\epsilon_{0}[tex] = vacuum permittivity

[tex]\hbar[tex] = Planck's constant over 2pi

n = quantum number

[tex]E_{1}[tex] = hydrogen's ground state = -13.6 eV

Therefore, the energy of the emitted photon is given by the difference of the energy in the 3d orbital minus the energy in the 2nd orbital:

[tex]E_{3} - E_{2} = -13.6 eV(\frac{1}{3^{2}} - \frac{1}{2^{2}})=1.89 eV[tex]

Now, knowing the energy of the photon, we can calculate its wavelength using the equation:

[tex]E = \frac{hc}{\lambda}[tex], where:

E = Photon's energy

h = Planck's constant

c = speed of light in vacuum

[tex]\lambda[tex] = wavelength

Solving for [tex]\lambda[tex] and substituting the required values:

[tex]\lambda = \frac{hc}{E} = \frac{1.239 eV\mu m}{1.89 eV}=0.655\mu m = 655 nm[tex], which correspond to the visible spectrum (The visible spectrum includes wavelengths between 400 nm and 750 nm).

Answer: Option (a) is the correct answer.

Explanation:

When is released from driving cars, some of which is absorbed by the plants but the rest of reacts with the sea or ocean water.

It reacts with water molecules and changes the chemistry of ocean water by lowering its pH. As it is known that when pH becomes lower then the substance becomes acidic in nature.

Thus, we can conclude that driving cars lowers the pH of the oceans by releasing that dissolves and forms acid in the oceans.

The given reactions are combination reaction, decomposition reaction, neutralization reaction, displacement reaction and double displacement reaction.

What is displacement reaction?

A displacement reaction is a chemical process during which a one more reactive element being replaced from its compound by a less reactive element.

What is combination reaction?

When A combination reaction occurs when one or more elements or compounds react together to generate a new chemical. Equations of the following kind are used to depict such reactions.

X+ Y→XY

6) → , this reaction is a kind of combination reaction reaction.

7) →

This reaction is a kind of displacement reaction.

8)  →.

This reaction is a kind of combustion reaction.

9) → .

This reaction is a kind of decomposition reaction.

10) → .

This reaction is a kind of combination reaction.

11) .

This reaction is a kind of dissociation reaction.

12) .

This reaction is a kind of double displacement reaction.

13) .

This reaction is a kind of decomposition reaction

14) .

This reaction is a kind of single displacement reaction.

15) .

This reaction is kind of double displacement reaction.

16) .

This reaction is a kind of combination reaction.

17) →.

This reaction is a kind of double displacement reaction.

18) .

This reaction is a kind of single displacement reaction.

19) .

This reaction is a kind of combination reaction.

To know more about displacement reaction click here.

brainly.com/question/3172917.

#SPJ2

combination reaction,decombinationreaction,displacementreaction,decombinatioreaction,neutrilizatioreaction