Atoms of I-131 spontaneously decay when the(1) stable nuclei emit alpha particles(2) stable nuclei emit beta particles
(3) unstable nuclei emit alpha particles
(4) unstable nuclei emit beta particles
Answers
The unstable nuclei emit beta particles.
What is unstable nuclei?
An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons.
What is beta particle?
- An unstable nucleus can emit a fast-moving electron called a beta particle, to become more stable.
- Beta radiation is made up of a stream of beta particles emitted from unstable nuclei.
- Beta radiation is normally emitted from unstable nuclei in which the number of neutrons is much larger than the number of protons.
- A beta particle has a relative mass that can be considered to be zero, so its mass number is zero, and as the beta particle is an electron, it can be written as ⁰₋₁e. It can also be written as ⁰₋₁β.
Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.
The unstable nuclei undergo spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some are unstable and spontaneously decay, emitting radiation.
Hence, option 4 is the answer.
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Answer;
(4) unstable nuclei emit beta particles
Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.
Explanation;
-Unstable nuclides undergo spontaneous change or the spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some areunstable and spontaneously decay, emitting radiation.
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Which statement compares the masses of two subatomic particles?(1) The mass of an electron is greater than the mass of a proton.(2) The mass of an electron is greater than the mass of a neutron.(3) The mass of a proton is greater than the mass of an electron.(4) The mass of a proton is greater than the mass of a neutron.
Which of the following is equal to 4 kilograms? A. 4,000 mgB. 4,000 gC. 40 gD. 4,000 cg
A. 2
B. 20
C. 200
D. .002
Answers
2,000 meters = 2 kilometers
Meters and kilometers are used in the metric system.
If we know that 1,000 meters = 1 kilometer, we can double 1 and we will get 2. Therefore, 2,000 meters = 2 kilometers.
Answer: 2, you divide the value by 1000, so... 2000/1000 = 2.
Answers
To do that you first need to find the balanced chemical equation for the reaction which is N₂+3H₂⇒2NH₃. Then you need to find how many moles of ammonia are in 1.735g by dividing 1.735 by the molar mass of ammonia (17g/mol) to get 0.1021mol of ammonia. After that you can find the number of moles of N₂ required to make 0.1021mol of ammonia by using the fact that 1mol N₂ is used to make 2mol NH₃ so you divide 0.1021 by 2 to get 0.05103mol N₂. lastly you can find the number of grams of N₂ by multiplying 0.05103 by the molar mass of N₂ (28g/mol) to get 1.42g of N₂. Therefore 1.4g of N₂ is required to make 1.7g of ammonia.
I hope this helps. Let me know in the comments if anything is unclear.
A
absorption
В.
reflected
C.
refraction
O D.
scattering
Answers
Answer:
B absorption
Explanation:
because absorption is the transfer of energy carried by light waves to particles of matter
Answers
Answer: The mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g
Explanation:
- Calculating the mass of ammonia:
To calculate the number of moles, we use the equation:
.....(1)
Given mass of ammonium sulfate = 20.3 g
Molar mass of ammonium sulfate = 132.14 g/mol
Putting values in equation 1, we get:
The chemical equation for the reaction of ammonia and sulfuric acid follows:
As, sulfuric acid remains unreacted, which means it is an excess reagent and its starting mass cannot be determined from ammonium sulfate.
By Stoichiometry of the reaction:
1 mole of ammonium sulfate is produced by 2 moles of ammonia.
So, 0.154 moles of ammonium sulfate is produced by = of ammonia.
Now, calculating the mass of ammonia from equation 1, we get:
Molar mass of ammonia = 17 g/mol
Moles of ammonia = 0.308 moles
Putting values in equation 1, we get:
- Calculating the mass of sulfuric acid
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
Let the mass of sulfuric acid be 'x' grams
We are given:
Mass of ammonium sulfate = 20.3 grams
Mass of ammonia = 5.236 grams
Total mass on reactant side = 5.236 + x
Total mass on product side = 20.3 g
So, by applying law of conservation of mass, we get:
Hence, the mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g
34.06g : 98.08g : 132.14g
x y 20.03g
x = [20.03g*34.06g]/132.14g = 5.16g
5.16g + y = 20.03g ⇔ from stoichiometric ratio
20.03g - 5.16g = y
y = 14,87g + 5.89g = 20.76g ⇔ 5.89g of sulfuric(VI) acid remains unreacted
Starting mass:
mNH₃ = 5.16g
mH₂SO₄ = 20.76g
Answers
Answers
If two gases react, compressing the gases generally increases the rate of reaction.
What is Collision Theory ?
It states that a chemical reaction can occur the reacting particles must hit each other is called Collision theory.
What is a Chemical Reaction ?
A chemical reaction is a process in which the chemical bonds between atoms to break and reorganize, to form other new substances. In chemical reaction matter cannot be created or destroyed. It is called the law of conservation of mass.
Thus from the above conclusion we can say that If two gases react, compressing the gases generally increases the rate of reaction.
Learn more about the Collision Theory here: brainly.com/question/20628781
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