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Norma-Jean [14]
3 years ago
12

An atom has a mass number of 9 and 5 neutrons. What is its atomic number? A 19 B. 14 O c.4 D. 11 SN​

Chemistry
2 answers:
nika2105 [10]3 years ago
5 0

Answer:

\boxed {\boxed {\sf C. \ 4}}

Explanation:

First, define some important terms.

  • Mass number: the sum of the nucleons (protons and neutrons)
  • Atomic number: the number of protons

We know the mass number is 9. So, the sum of protons and neutrons is 9.

  • mass \ number =9
  • protons + neutrons = 9

We also know the atoms has 5 neutrons. Therefore, the rest must be protons.

  • protons + 5 \ neutrons =9

Subtract the 5 neutrons from the overall mass number of 9.

  • protons = 9- 5 \ neutrons \\
  • protons=4

There are 4 protons, so the atomic number is also <u>4</u>. This atom is beryllium.

butalik [34]3 years ago
4 0

Answer:

C. 4

Explanation:

the mass is the number of neutrons and Protons. so if you have 5 neutrons that means the rest are Protons... and the number of Protons is the Atomic number meaning the Element number... Beryllium is the element :)

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Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
lubasha [3.4K]

Answer: Compound

Explanation:  pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.

6 0
3 years ago
All substances are composed of which type of matter
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8 0
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Carbon dioxide (CO2) fills a closed, rigid tank fitted with a paddle wheel, initially at 80°F, 30 lbf/in2, and a volume of 1.6 f
solong [7]

Answer:

The answer to this question can be given as:  

The initial pressure P= 30 lbf/in2

The initial temperature T1=80°F.

The initial volume=final volume V= 1.6 ft3.

Final  temperature T2=500°F

Heat transfer Q=-2.6 Btu.

pressure (P) (lbf/in2) change into lbf/ft2

P=30 lbf/in2=4320lbf/ft2.

Temperature (T1) °F change into °K

temperature T1=80°F=539.67 °K

Ideal gas formula:

M=PV/RT1.                   where T1=initial temperature.

M=4320*1.6/35.114*539.67.

M=0.364749 lb             Mass at Carbon dioxide (CO2).

DQ=DU+W            second law.

-2.6=MCV(T2-T1)+ W        

-2.6-(0.364749*1.6(500-80))=W

W=-27.111 b+u  am----> work done.

Explanation:

The explanation to this question can be given as:

Firstly we write the equation that is given in the question like, pressure, volume, gas constant, temperature. Then we covert the pressure and temperature into there possible values. Then We apply the formula of Ideal gas that is  M=PV/RT1. where M is  the mass, P is the pressure , V is the volume , R is the gas constant (0.08206 L·atm·K−1·mol−1)  and T1 is the initial temperature. Then we use the second formula that is DQ=DU+W. Where DQ= Heat transfer, DU=MCV(T2-T1)and W= work. It is used for finding work.

8 0
3 years ago
Calculate the volume in cm^3 of 325.0 dg of alcohol. Alcohol has a density of 0.785g/mL.
Masteriza [31]
Answer:
106 mL

Explanation:
In order to be able to answer this question, you must understand what the density of a substance tells you.
The density of a substance is nothing more than the mass of that substance that occupies one unit of volume.
In your case, the density of ethanol is given in Grams per milliliter, which means that one unit of volume will be
1 mL
.
So, ethanol has a density of
0.785 g mL
−
1
, which is equivalent to saying that if you take exactly
1 mL
of ethanol and weigh it, you will end up with a mass of
0.785 g
.
Now, you know that the volume you're using has a mass of
83.3 g
. Well, if you get
0.785 g
for every
1 mL
of ethanol, it follows that this much mass will correspond to a volume of
83.3
g ethanol
⋅
ethanol's density

1 mL
0.785
g ethanol
=
106.11 mL
Rounded to three sig figs, the answer will be
V
ethanol
=
106 mL



Hope this helps
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nikdorinn [45]
<span>The process of removing or adding electrons is called ionization </span>
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