A because you can prove that with the graph you are given in the wuestion
1. The atomic number deceases by one and the atomic mass is unchanged - β⁺/positron emission. In this a proton is converted to a neutron, hence no net change in mass. Since a proton is converted to neutron, the daughter nuclide's proton number /atomic number decreases by 1. Then atomic number decreases by 1 and no change in mass.
2.the atomic number decreases by two, and the atomic mass decreases by four - alpha decay / ⁴₂α. alpha particles have 2 neutrons and 2 protons. Since 2 protons and 2 neutrons are emitted, the mass of the nuclide decreases by 4. Since 2 protons have been emitted, this results in atomic number decreasing by 2.
3.<span>the atomic number increases by one, and the atomic mass remains unchanged. - </span>β⁻ beta decay. In this type of decay - beta decay , a neutron is converted to a proton, therefore no net change in mass. Since a proton is formed, atomic number increases by 1. Therefore atomic number increases by 1 and no change in mass.
Answer:
I believe the answer is B
Explanation:
A nucleus of an atom has protons and neutrons. We know that a proton has a charge of +1 , while a neutron has no charge, or 0 . Therefore, the nucleus of an atom will always have a positive charge.
The solubility of the gas is reduced when thermal energy is added to the solution, which overcomes the forces of attraction between the solvent molecules and the gas molecules.
Just consider it from a straightforward angle. Is it true that heating a solvent accelerates evaporation? Which glass will entirely evaporate first, at a temperature of 25 or 75 degrees, if you place the same amount of water in them both?
Gases are already inherently gases. Imagine how anxious gas molecules would be to escape if solvent molecules were to want to escape from the bulk solvent when the temperature was raised.
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Answer:
0.0269 M
Explanation:
There is some info missing. I think this is the original question.
<em>Suppose 0.816 g of potassium nitrate is dissolved in 300 mL of a 14.0 mM aqueous solution of sodium chromate. Calculate the final molarity of potassium cation in the solution. You can assume the volume of the solution doesn't change when the potassium nitrate is dissolved in it. Be sure your answer has the correct number of significant digits.</em>
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The molecular equation corresponding to this reaction is:
2 KNO₃(aq) + Na₂CrO₄(aq) ⇄ K₂CrO₄(aq) + 2 NaNO₃(aq)
The full ionic equation is:
2 K⁺(aq) + 2 NO₃⁻(aq) + 2 Na⁺(aq) + CrO₄²⁻(aq) ⇄ 2 K⁺(aq) + CrO₄²⁻(aq) + 2 Na⁺(aq) + 2 NO₃⁻(aq)
As we can see, the moles of K⁺ are equal to the initial moles of KNO₃. The molar mass of KNO₃ is 101.10 g/mol. The moles of KNO₃ (and K⁺) are:
0.816 g × (1 mol/ 101.10 g) = 8.07 × 10⁻³ mol
The molarity of K⁺ is:
8.07 × 10⁻³ mol / 0.300 L = 0.0269 M