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2 years ago

Which of the following best describes earth tectonic plates ?

Chemistry

2 answers:

saw5 [17]2 years ago

8 0

Im pretty sure the answer is B.

meriva2 years ago

6 0

Answer:

B They move because of the convection currents in the mantle.

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Calculate the wavelength for the transition from n = 4 to n = 2, and state the name given to the spectroscopic series to which t

finlep [7]

Answer:

The wavelength for the transition from n = 4 to n = 2 is 486nm and the name name given to the spectroscopic series belongs to The Balmer series.

Explanation

lets calculate -

Rydberg equation- $\frac{1}{\pi } =R(\frac{1}{n_1^2} -\frac{1}{n_2^2})$

where , $\pi$ is wavelength , R is Rydberg constant ( $1.097\times10^7$ ), $n_1$ and $n_2$ are the quantum numbers of the energy levels. (where $n_1=2 , n_2=4$ )

Now putting the given values in the equation,

$\frac{1}{\pi }=1.097\times10^7\times(\frac{1}{2^2} -\frac{1}{4^2} )$ $=2056875m^-^1$

Wavelength $\pi =\frac{1}{2056875}$

= $4.86\times10^-^7$ = 486nm

 Therefore , the wavelength is 486nm and it belongs to The Balmer series.

8 0

3 years ago

Provide three different examples of how minerals can form on earth

Misha Larkins [42]

A mineral is a naturally occurring , solid, crystalline substance with a specific chemical composition. Minerals are usually inorganic and are formed by ionic, covalent or metallic bonding. Ionic bonds are the dominant type of bonds in mineral strictures. 90% of all minerals are ionic compounds. Minerals bonded by covalent bonds are strong, for example carbon bonded together to form diamond. Metallic bonds are a type of covalent bonds where the atoms have a strong tendency to lose electrons and pack together as cations.

6 0

3 years ago

In the chemical reaction:

tiny-mole [99]

Answer:

Explanation:

6 0

2 years ago

By studying the distribution of different types of fossils, geologists have determined that some plates have traveled great dist

WITCHER [35]

Answer:

A. Fossils of organisms that lived in warm climates have been found in arctic environments.

Explanation:

One of the logic used by Geologists to justify plate movement over a region of space is that the fossils of organisms that lived in warm climates have been found in arctic environments.

this is as a result of plate tectonics.
organisms that are well adapted to warm climates in times past have their relics preserved as fossils.
their fossils are no found today around the arctic environment which are cold
this suggests that the plate must have drifted or moved

6 0

3 years ago

A container of hydrogen gas has the same temperature as a container of oxygen gas. The gas atoms having the greater average kine

user100 [1]

Answer:

hope this helps

Explanation:

The atoms of hydrogen have smaller mass than oxygen. Thus their speeds have to higher in order to produce the same average kinetic energies.

4 0

2 years ago