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Lelu [443]
3 years ago
11

In which of the following is the number of neutrons correctly represented? A. fluorine: atomic number 9, mass 19, neutrons 0 B.

arsenic: atomic number 33, mass 75, neutrons 108 C. magnesium: atomic number 12, mass 24, neutrons 24 D. uranium: atomic number 92, mass 238, neutrons 146
Chemistry
2 answers:
Digiron [165]3 years ago
4 0
D. uranium: atomic number 92, mass 238, neutrons 146

238-92=146
earnstyle [38]3 years ago
3 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Atomic number is defined as the number of protons that are present in an atom. It is represented as Z.

Z = Atomic number = Number of protons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.  It is represented as A.

A = Mass number = Number of protons + Number of neutrons

For the given options:

  • <u>Option A:</u> Fluorine

Atomic number = 9

Mass number = 19

Number of neutrons = 19 - 9 = 10

Thus, the number of neutrons are not represented correctly.

  • <u>Option B:</u> Arsenic

Atomic number = 33

Mass number = 75

Number of neutrons = 75 - 33 = 42

Thus, the number of neutrons are not represented correctly.

  • <u>Option C:</u> Magnesium

Atomic number = 12

Mass number = 24

Number of neutrons = 24 - 12 = 12

Thus, the number of neutrons are not represented correctly.

  • <u>Option D:</u> Uranium

Atomic number = 92

Mass number = 238

Number of neutrons = 238 - 92 = 146

Thus, the number of neutrons are represented correctly.

Hence, the correct answer is Option D.

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White raven [17]

Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of the drawing  referred to in the question.

However, each option refers to a particular respiratory system and with the organs and the tissues mentioned here one can eventually identify which option is correct when the drawing is available.

A) The system described here is the cardiovascular system (or the circulatory system). This system involves the heart, blood vessels and the blood (which are what help in the transport of the materials mentioned in the question).

B) The system described here is the digestive system. This system involves the gastrointestinal tract and organs (that assist in the production/secretion or storage of chemicals that breakdown food into smaller pieces) such as the mouth, esophagus, stomach, small intestine, large intestine, rectum and the anus.

C) The system described here is the skeletal system. This system involves all the bones and joint in the body (the skeleton) which also helps in protecting organs in the body.

D) The system described here is the Endocrine system. This system involves several internal glands (such as the thyroid gland and the adrenal glands) in the body.

NOTE: Identify which organ and/or tissue is present in the diagram and use that to select the appropriate option from the description of each of the options provided above.

4 0
3 years ago
Read 2 more answers
Collision of which two types of plates create the deepest earthquakes? Why do you think this is?
Elis [28]

Answer:

The collision of oceanic plates and any other plates in which the oceanic plate slides beneath the other plate creates the biggest earth quakes. Most of these earth quakes occur beneath the sea or oceans and can cause volcanic eruptions as well. Tsunami is another oceanic event that occurs due to earth quakes occurring due to shifting of plates beneath the sea.

7 0
3 years ago
Click on the question mark. Choose the MOST reasonable inference based on the text evidence and what you already know. "in a anc
katrin2010 [14]

Answer:

in an ancient

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when the word begins with a vowel you say an instead of a

8 0
3 years ago
Vincent graduated from college with a degree in horticulture and now owns a local plant nursery. He maintains a blog titled, "Ho
Mamont248 [21]

Answer: Option (C) is the correct answer.

Explanation:

Horticulture is the study of science related to the art of growing fruits, vegetables, or plants.

Therefore, when a person graduated from a college with a degree in horticulture then it means he has obtained enough knowledge about how to grow plants, fruits or vegetables in the best way possible.

Thus, Vincent who also graduated in horticulture cannot accurately tell about human psychology.

Hence, we can conclude that the statement this claim may not be accurate because the blog is produced by someone who is not an expert in the field of human psychology.


7 0
3 years ago
Read 2 more answers
Consider the generic reaction: 2 A(g) + B(g) → 2 C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what is the
irina1246 [14]

Answer:

b. 1.5 atm.

Explanation:

Hello!

In this case, since the undergoing chemical reaction suggests that two moles of A react with one moles of B to produce two moles of C, for the final pressure we can write:

P=P_A+P_B+P_C

Now, if we introduce the stoichiometry, and the change in the pressure x we can write:

P=1.0-2x+1.0-x+2x

Nevertheless, since the reaction goes to completion, all A is consumed and there is a leftover of B, and that consumed A is:

x=\frac{1.0atm}{2}=0.5atm

Thus, the final pressure is:

P=1.0-2(0.5)+1.0-(0.5)+2(0.5)\\\\P=1.5atm

Therefore the answer is b. 1.5 atm.

Best regards!

3 0
2 years ago
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