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Mila [183]
3 years ago
6

A radioactive element is half disintegrated in 40 minutes. What is the time required for the decay of 75% of the element

Chemistry
1 answer:
natali 33 [55]3 years ago
8 0
80 minutes its half life is 40 mins and another 40 would decay half of the 50% left currently
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Which daughter element is produced from the alpha decay of 213 over 85 At ?
pantera1 [17]

Answer:

209

83 Bi

Explanation:

213 213 - 4 4

85 At = 85 - 2 Y + 2 He

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4 years ago
Describe the structure of atoms, including locations and charges of protons, neutrons, and electrons
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Which of the following likely has the lowest electronegativity value?
Harman [31]
<span>Cesium has the lowest electronegativity value. </span>
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3 years ago
1. In class, students learned that a cart will move when a force of 50 N
zzz [600]

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4 0
3 years ago
When 0.040 mol of propionic acid, c2h5co2h, is dissolved in 750 ml of water, the equilibrium concentration of h3o+ ions is measu
WITCHER [35]
Answer is: Ka for propanoic acid is 6,57·10⁻⁵.
Chemical reaction: C₂H₅COOH(aq) + H₂O(l) ⇄ C₂H₅COO⁻(aq) + H₃O⁺(aq).
n(C₂H₅COOH) = 0,04 mol.
V(C₂H₅COOH) = 750 mL = 0,75 L.
c(C₂H₅COOH) = 0,04 mol ÷ 0,75 L.
c(C₂H₅COOH) = 0,053 mol/L = 0,053 M.
[C₂H₅COO⁻] = [H₃O⁺] = 1,84·10⁻³ M = 0,00184 M.<span>
[HCN] = 0,053 M - 0,00184 M = 0,0515 M.
Ka = [</span>C₂H₅COO⁻] · [H₃O⁺] / [C₂H₅COOH].
Ka = (0,00184 M)² / 0,0515 M.
Ka = 6,57·10⁻⁵.
3 0
3 years ago
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