CHEMISTRY HIGH SCHOOL

PLEASE HELPConsider the chemical equations shown here.

3 equations. 1: upper N upper O gas plus upper O subscript 3 gas right arrow upper N upper O subscript 2 gas plus upper O subscript 2 gas. Delta H subscript 1 equals 198.9 kilojoules. 2: StartFraction 3 over 2 EndFraction upper O gas right arrow upper O subscript 3 gas. Delta H subscript 2 equals 142.3 kilojoules. 3: upper O gas right arrow one half upper O subscript 2 gas. Delta H subscript 3 equals negative 247.5 kilojoules.



What is DeltaHrxn for the reaction shown below?


NO(g)+O(g)->NO2(g)

Answers

Answer 1
Answer:

Answer:

-304.1

I had this question and that’s what I got
Answer 2
Answer:

Answer:

-867.7

Explanation:

yeah

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Which particle has the least mass alpha,neutron,betas particle,or proton

Answers

The particle that has the least mass is a beta particle.

If we look at the particles listed individually, we can see that the proton and the neutron are both massive particles found in the nucleus of an atom. They are responsible for the mass of the atom. An alpha particle is just of the same mass as a helium nucleus.

A beta particle is actually an electron. Recall that an electron has negligible mass.The mass of an electron is about 1/840 times that of the proton.

Learn more: brainly.com/question/2673886

Final answer:

The least massive particle among alpha particles, neutrons, beta particles, and protons is the beta particle (also known as an electron). Its mass is so small that it would take about 1800 electrons to equal the mass of a single proton or neutron.

Explanation:

The masses of the different particles are as follows - protons and neutrons are heavier particles with a mass of 1.0073 and 1.0087 amu respectively, while an alpha particle, which is a high-energy helium nucleus, has a mass number of 4 (which makes it heavier than a proton and neutron). Compared to these particles, the beta particle is a high-energy electron and has a much lighter mass.

Specifically, the beta particle, or electron, is the least massive among the list, with a light particle mass of about 0.00055 amu. This means that it would take about 1800 electrons to equal the mass of a single proton or neutron. So, to answer your question, when comparing an alpha particle, neutron, beta particle (electron), and a proton, the beta particle (electron) is the particle with the least mass among them.

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Which element, represented by X, reacts with fluorine to produce the compound XF2?

Answers

Elements in Group 2 of the periodic table.

The spontaneous decay of an atom is called(1) ionization (3) combustion
(2) crystallization (4) transmutation

Answers

The spontaneous decay of an atom is known as transmutation.  

• The conversion of one chemical element or an isotope into another chemical element is termed as nuclear transmutation.  

• It takes place in any process where the number of neutrons or protons in the nucleus of an atom is changed.  

• It is the spontaneous decay of an atom.  

• Transmutation can be attained either by radioactive decay or by nuclear reactions. In radioactive decay no external cause is required, while in nuclear reactions an external particle reacts with a nucleus.  

• One kind of natural transmutation is witnessed when some kind of radioactive elements found in nature spontaneously decay by a procedure that leads to transmutation like beta or alpha decay.  

Thus, the correct answer is option 4, that is, transmutation.

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Transmutation is the Spontaneous / sudden decay of an atom. 

Which radioisotope has the fastest rate ofdecay?
(1) 14C
(2) 37Ca
(3) 53Fe
(4) 42K

Answers

The correct answer is 2. 37Ca.

The fastest rate of decay in radioisotope is 37Ca. Another name for radioisotope is radioactive of isotopes which are of given element.

The different number of neurons and the same number of protons are present on the same element with different isotopes. Radioisotopes are considered to have an unstable combination of neutrons and protons.
The correct answer to this question is (2) 37Ca . The radioisotope that has the fastest rate of decay is 37Ca. Radioisotope or also known as radioactive isotopes of a given element. Same number of protons but different number of neurons are present on different isotopes of the same element. They are considered as atoms that have unstable protons and neutrons combination.

A bullet of mass 50g is fired from a gun at a speed of 250ms. What is the kinetic energy possessed by the bullet?

Answers

Answer: the kinetic energy possessed by the bullet is 1562.5 Joules (J).

Explanation:

The smallest particle of an element that retains the chemical identity of that element is a/an A. atom.
B. compound.
C. molecule.
D. mixture.

Answers

The answer is A. atom. An atom has nucleus and electrons and its own characteristics. While compound and molecule are consists of different atoms. And mixture is consists of different compounds.
A. ATOM is the correc answer
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