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Doss [256]
3 years ago
14

A normal nitrogen atom has seven protons and seven neutrons. Which of the following atoms are isotopes of nitrogen? Check all th

at apply
A: an atom with eight protons and eight neutrons

B: an atom with seven protons and six neutrons

C: an atom with seven protons and nine neutrons

D: an atom with five protons and seven neutrons
Physics
1 answer:
KATRIN_1 [288]3 years ago
7 0

Answer:

B and C

Explanation:

A is not true. That is an entirely different atom

B is possible. The neutrons don't effect the atomic number or the place on the periodic table.

C is also correct. The nitrogen is just a little heavy.

D has too few protons. It is not part of the nitrogen family.

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Suppose that an electron and a positron collide head-on. Both have kinetic energy of 1.64 MeV and rest energy of 0.511 MeV. They
trasher [3.6K]

The electron and positron collide and annihilate each other, converting their total energy (sum of kinetic and rest energy) into energy carried by two photons:

2(1.64MeV  + 0.511MeV) = 2E_{photon}

E_{photon} = 1.64MeV  + 0.511MeV

E_{photon} = 2.15MeV

3 0
3 years ago
A cylinder contains a mixture of helium and argon gas in equilibrium at 160°C.
Artist 52 [7]

Answer:

a. E=8.97*10^{-21} J

b. v-He2 = 1.161 km/s

v-Ar2 = 369.74 m/s

Explanation:

(a) The average kinetic energy is given by

E_k=\frac{1}{2}k_BT

where KB is the Boltzman's constant and T is the temperature. For each molecule we have:

E_k=\frac{3}{2}(1.38066*10^{-23}\frac{J}{K})(433.15K)=8.97*10^{-21}J

is the same for both type of molecules because is independent of the mass

(b)

v_{rms}=\sqrt{\frac{3RT}{M}}

where R is the constant of ideal gases, and M is the mass of the molecule. BY replacing for each type of molecule we obtain:

v_{rms-He_{2}}=\sqrt{\frac{3(8.311434Jmol^{-1}K^{-1})(433.15K)}{0.008kg\ mol^{-1}}}=1161.9\frac{m}{s}\\\\v_{rms-Ar_{2}}=\sqrt{\frac{3(8.311434Jmol^{-1}K^{-1})(433.15K)}{0.079kg\ mol^{-1}}}=369.74\frac{m}{s}

v-He2 = 1.161 km/s

v-Ar2 = 369.74 m/s

hope this helps!!

8 0
3 years ago
Integrated Science- 8th grade science
padilas [110]

Answer:

A. a rigorously tested explanation

Explanation:

  • B. and D. are out - theories are not opinionated, they are factual
  • C. is out - not all theories are mathematical
  • A. is the best choice
3 0
3 years ago
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The energy diagram shows the changes in energy during a chemical reaction.
Reil [10]

Answer: A. The reactants have higher potential energy, and energy is released.

Explanation:

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2 years ago
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skad [1K]

DibujaZos da buenos tips e incluso el pinta con colores faber castel son económicos y el dibujo queda epico

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3 years ago
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