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Harman [31]
3 years ago
12

The mass number of a nucleus (except Hydrogen) is:

Chemistry
2 answers:
posledela3 years ago
8 0
Never less than its atomic number
This is because the mass number is the sum of both the number of neutrons and protons, while the atomic number is the number of protons. Hydrogen is the only element without neutrons.
Verizon [17]3 years ago
8 0
Never less than its atomic no.

Mass no. = protons + neutrons
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Sodium reacts with water to produce sodium hydroxide and hydrogen gas:
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3

Explanation:

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Which of the following is an example of a physical change in matter?
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Answer is B.

Explanation:

A physical change is one in which there is no change in chemical composition of a substance. while a process in which there is change in chemical composition it is called a chemical change.


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"What is the change of entropy for 3.0 kg of water when the 3.0 kg of water is changed to ice at 0"
Artyom0805 [142]

Q: What is the change of entropy for 3.0 kg of water when the 3.0 kg of water is changed to ice at 0 °C? (Lf = 3.34 x 105 J/kg)

Answer:

-3670.33 J/K

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Entropy: This can be defined as the degree of randomness or disorderliness of a substance. The S.I unit of Entropy is J/K.

Mathematically,  change of Entropy can be expressed as,

ΔS = ΔH/T ....................................... Equation 1

Where ΔS = Change of entropy, ΔH = heat change, T = temperature.

ΔH = -(Lf×m).................................... Equation 2

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But T = 0 °C = (0+273) K = 273 K.

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ΔS = -1002000/273

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2 years ago
What changes occur in the nuclei of atoms involved in the reactions that fuel nuclear power plants?
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2.  Fission does not normally occur in nature while fusion occurs mostly in heavenly bodies such as the stars.

3.Fission produces highly radioactive particles that can be hazardous to both the living things and its habitat or environment while fusion is "clean energy" and "environmental friendly" meaning there are fewer radioactive particles are produced. But if a fission "trigger" is being used, there will  be radioactive particles produced.

Among the two nuclear changes, fission is widely used because this reaction produces heat in nuclear reactor. This heat is used to generate steam which operates the turbines to eventually produce electricity.
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