22. What changes occur to the atomic number and mass of a nucleus during each of

Question

22. 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. 23. . What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: radiation 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 24. 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 25. 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. 26. 239Pa is a nuclear waste by product with a half – life of 24,000 y. What fraction of the 239Pu present today will be present in 1000y? 27. Calculate the molecular or formula mass for P4 28. Calculate the molecular or formula mass for H2O 29. Calculate the molecular or formula mass for Ca(NO3)2 30. Calculate the molecular or formula mass for CH3CO2H ( acetic acid) 31. Calculate the molecular or formula mass for C12H22O (sucrose, cane sugar) 32. Determine the mass in grams of 0.6000 mol of oxygen atoms ( grams x 1mole/(Mass of element) 33. Determine the mass in grams of 0.600 mol of oxygen molecules, O2 (grams x 1mole/mass of molecule) 34. Determine the mass I grams of 0.600 mol of ozone molecules, O3 (grams x 1mole/(mass of molecule) 35. Which type of radiation is most penetrating? A, alpha B. beta C. gamma D. they are equal

Explanation / Answer

22. A particle is emitted then The atomic number increases by one and the mass number remains unchanged.
A X Z -----> A Y (Z+1) + -1
Answer : B
23. A radiation is emittedThe atomic number and mass number remain unchanged.
A X Z -----> A Y Z + 0
Answer : C
24. A positron is emitted then The atomic number decrease by one and the mass number remains unchanged.
A X Z -----> A Y (Z-1) + e+1
Answer : E
25. An electron is captured then The atomic number decreases by one and mass number remains unchanged.
A X Z + e-1 -----> A Y (Z-1)
Answer : D
Where X, Y are symbols of different elements of respective reactions
A - mass number of element.
Z - atomic number of the element.

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