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sergey [27]
3 years ago
10

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?

Chemistry
1 answer:
MrRa [10]3 years ago
6 0

Answer:

It has 5 neutrons

Explanation:

The fact that it is a neutral atom tells us that the number of electrons and protons is the same:

  • The problem tells us there are 4 electrons, thus there are 4 protons.

The average mass of an atom is the sum of the number of protons and the number of neutrons:

  • Mass = # Protons + # Neutrons

With the above information in mind we can <u>calculate the number of neutrons</u>:

  • 9 amu = 4 Protons + # Neutrons
  • # Neurons = 5 Neutrons
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Which structure is located between the auricle and the eardrum? O stirrup O ear canal O auditory nerve Ocochlea​
Damm [24]

Answer:

The structure that is located between the auricle and the eardrum is the ear canal.

Explanation:

The ear canal, or external ear canal, is a a tubular hole about 30 mm long that runs from the auricle to the eardrum, forming part of the external ear.

Its function is to conduct sound, in the form of vibrations, from the outside to the eardrum. It also has the function of producing a viscous secretion called cerumen, capable of trapping dust particles and small foreign bodies.

Other options are not correct because:

  • <em>Stirrup is located in the middle ear, along with the anvil and hammer. </em>
  • <em>Cochlea is in the inner ear and continues with the auditory nerve.</em>

3 0
3 years ago
Do different spheres heat at different rates?
enot [183]
Yes, size, density, etc. will change the heating rate :)
7 0
3 years ago
What do hydrologists primarily study?<br> O A. Stars<br> O B. Rocks<br> O c. Water<br> O D. Weather
lara31 [8.8K]
Hydrologists primarily study water, i think
6 0
3 years ago
If 14 moles of gas are added to a container that already holds 1 mole of gas, the pressure inside the container _ due to change
ioda

Answer:

The pressure inside the container will increase by increasing the amount of gas.

Explanation:

It can be better understand through ideal gas equation,

PV = nRT

By keeping the volume and temperature constant, the pressure of gas in container will increase when amount of gas goes to increase.

PV = nRT

P = nRT / V

P = (1+ 14) RT/V

P = 15

The pressure will increase 15 fold.

3 0
3 years ago
What is the frequency of a light that has a wavelength of 3.0 x 10 -7m?
alexdok [17]

Answer:

 frequency of light (f) = 1 x 10¹⁵s⁻¹

Explanation:

Given Data:

Wavelength of light λ = 3.0 x10⁻⁷m

Frequency of light: to be calculated

Formula Used to find frequency:

                                  f = V/λ ........................... (1)

where

f is the frequency

V is the velocity

λ is wavelength

Velocity of light = 3 x 10⁸ ms⁻¹

put the values in equation (1)

                                     f =  3 x 10⁸ ms⁻¹ / 3.0 x10⁻⁷m

                                     f = 1 x 10¹⁵s⁻¹

   So the frequency of light =  1 x 10¹⁵s⁻¹

7 0
3 years ago
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