Answer:
B. electrons possess the largest charge-to-mass ratio among the subatomic particles listed in the four choices.
Explanation:
Consider the mass of each particle. Express the masses in atomic mass units:
- Protons: approximately 1.007 amu each;
- Neutrons: approximately 1.009 amu each;
- Electrons: approximately 0.0005 amu each.
Similarly, consider the charge on each particle. Express the charges in multiples of the fundamental charge:
- Protons: +1 e;
- Neutrons: 0;
- Electrons: -1 e.
Calculate the charge-to-mass ratio for the three species:
- Protons: approximately
; - Neutrons: 0;
- Electrons: approximately
.
Almost all nuclei contain protons and neutrons. The only exception is the hydrogen-1 nucleus, which contains only one proton and no neutron. The mass of the nucleus is approximately the same as the sum of its components' masses. The extra neutron will only add to the mass of the nucleus (the denominator) without contributing to the charge (the numerator.) As a result, the charge-to-mass ratio of nuclei will be positive but no greater than the charge-to-mass ratio of protons.
Among the particles in the four choices, the charge-to-mass ratio is the greatest for electrons.
Answer: C - The iron becomes harder and stronger
Explanation:
The pure iron when mixed with the carbon then steel is formed which is the interstitial alloy of iron. About 0.002%- 2.1% (m/m) of carbon. The carbon atoms being smaller than the iron atom occupy the interstitial spaces or interstices in between the iron atoms. Thus these carbon atoms introduce imperfections in the iron crystal layer. The iron crystal layers become harder and they slide past one another and the iron becomes harder.
I think the answer for that question is The first one (A)
People who make medicine.
The balloon will reach its maximum volume and it will burst.
Given:
- A weather balloon at sea level, with gas at 65.0 L volume, 745 Torr pressure, and 25C temperature.
- When the balloon was taken to an altitude at which temperature was 25C and pressure was 0.066atm its volume expanded.
- The maximum volume of the weather balloon is 835 L.
To find:
Whether the weather balloon will reach its maximum volume or not.
Solution:
The pressure of the gas in the weather balloon at sea level = ![P_1=745 torr](https://tex.z-dn.net/?f=P_1%3D745%20torr)
![1 atm = 760 torr\\P_1=745 torr=\frac{745}{760} torr = 0.980 atm](https://tex.z-dn.net/?f=1%20atm%20%3D%20760%20torr%5C%5CP_1%3D745%20torr%3D%5Cfrac%7B745%7D%7B760%7D%20torr%20%3D%200.980%20atm)
The volume of the weather balloon at sea level = ![V_1=65.0L](https://tex.z-dn.net/?f=V_1%3D65.0L)
The temperature of the gas in the weather balloon at sea level:
![T_1=25^oC=25+273.15 K=298.15 K](https://tex.z-dn.net/?f=T_1%3D25%5EoC%3D25%2B273.15%20K%3D298.15%20K)
The balloon rises to an altitude.
The pressure of the gas in the weather balloon at the given altitude:
![P_2=0.066atm](https://tex.z-dn.net/?f=P_2%3D0.066atm)
The volume of the weather balloon at the given altitude = ![V_2=?](https://tex.z-dn.net/?f=V_2%3D%3F)
The temperature of the gas in the weather balloon at the given altitude:
![T_1=25^oC=25+273.15 K=298.15 K](https://tex.z-dn.net/?f=T_1%3D25%5EoC%3D25%2B273.15%20K%3D298.15%20K)
Using the Combined gas law:
![\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\\\frac{0.980 atm\times 65.0L}{298.15 K}=\frac{0.066atm\times V_2}{298.15K}\\V_2=\frac{0.980 atm\times 65.0L\times 298.15K}{0.066atm\times 298.15 K}\\=965L](https://tex.z-dn.net/?f=%5Cfrac%7BP_1V_1%7D%7BT_1%7D%3D%5Cfrac%7BP_2V_2%7D%7BT_2%7D%5C%5C%5Cfrac%7B0.980%20atm%5Ctimes%2065.0L%7D%7B298.15%20K%7D%3D%5Cfrac%7B0.066atm%5Ctimes%20V_2%7D%7B298.15K%7D%5C%5CV_2%3D%5Cfrac%7B0.980%20atm%5Ctimes%2065.0L%5Ctimes%20298.15K%7D%7B0.066atm%5Ctimes%20298.15%20K%7D%5C%5C%3D965L)
The maximum volume of the weather balloon= V = 835 L
![V < V_2](https://tex.z-dn.net/?f=V%20%3C%20V_2)
The volume of the weather balloon at a given altitude is greater than its maximum volume which means the balloon will reach its maximum volume and it will burst.
Learn more about the combined gas law:
brainly.com/question/13154969?referrer=searchResults
brainly.com/question/936103?referrer=searchResults