1. Complete the following equation 250/96 Cm + ? + 98/38 Sr + 41/0 n a. 148 60 P
ID: 1021823 • Letter: 1
Question
1. Complete the following equation 250/96 Cm + ? + 98/38 Sr + 41/0 n
a. 14860 Pr
b. 15562 Pr
c. 15060 Ce
d. 14858 Ce
2. An alpha particle is not represented by which of the following symbols
a.
b. 42 He
c. 42
d. 11 p
3. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: particle is emitted
a. The atomic number decreases by two and the mass number decrease by four
b. The atomic number increases by one and the mass number remains unchanged
c. The atomic number and mass number remain unchanged.
d. The atomic number decreases by one and the mass number remains unchanged
e. The atomic number decrease by one and the mass number remains unchanged.
4. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: a particle is emitted
a. The atomic number decreases by two and the mass number decrease by four
b. The atomic number increases by one and the mass number remains unchanged
c. The atomic number and mass number remain unchanged.
d. The atomic number decreases by one and the mass number remains unchanged
e. The atomic number decrease by one and the mass number remains unchanged.
5. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: a positron is emitted
a. The atomic number decreases by two and the mass number decrease by four
b. The atomic number increases by one and the mass number remains unchanged
c. The atomic number and mass number remain unchanged.
d. The atomic number decreases by one and the mass number remains unchanged
e. The atomic number decrease by one and the mass number remains unchanged.
6. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: an electron is captured
(a) The atomic number decreases by two and the mass number decreases by four.
(b) The atomic number increases by one and the mass number remains unchanged.
(c) The atomic number and mass number remain unchanged.
(d) The atomic number decreases by one and mass number remains unchanged.
(e) The atomic number decreases by one and the mass number remains unchanged
239Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239Pu present today will be present in 1000 y?
a. 50%
b. 92%
c. 97%
d. 86%
Explanation / Answer
Q.1: Let the mass number and atomic number of the unknown atom be 'A' and 'Z' respectively.
In a balanced nuclear equation the mass number and atomic number of all reactants must be equal to the atomic number and mass of all products.
Hence, for the given cehemical reaction
sum of mass number of all reactants = sum of mass number of all products
=> 250 = 98 + 4x1 + A
=> 250 = 102 + A
=> A = 148
Hence mass number of the unknown atom = 148
sum of atomic number of all reactants = sum of atomic number of all products
=> 96 = 38 + 4x0 + Z
=> 96 = 38 + Z
=> Z = 58
Hence the atom is 14858 Ce (answer)
Hence option (d) is correct.
Hence mass number of the unknown atom = 148
Q.2: 11P represents a proton. Hence 11P doesn't represent an alpha - particle. Hence option (d) is correct.
Q.3: The mass number of alpha-particle is 4 and atomic number is 2. Hence during alpha-decay mass number decreases by 4 and atomic number decreases by 2. Hence option (a) is correct.
Q.4: The mass number of beta-particle is negligible(0) and atomic number is -1. Hence during beta-decay mass number remains unchanged and atomic number increases by 1. Hence option (b) is correct.
Q.5: The mass number of positron is negligible(0) and atomic number is +1. Hence during positron decay mass number remains unchanged and atomic number decreases by 1. Hence option (d) is correct.
Q.6: The mass number of electron is negligible(0) and atomic number is -1. Hence during electron capture mass number remains unchanged and atomic number decreases by 1. Hence option (d) is correct.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.