Question 1

Which of the following correctly describes positron emission?

Accepted Answer

A process where a proton is converted into a neutron and a positron is emitted.

Question 2

What is the symbol for a positron in nuclear equations?

Accepted Answer

$\_{+1}^0 e$

Question 3

Which balanced nuclear equation represents the positron emission of Uranium-235?

Accepted Answer

$235\ 92\ U \rightarrow \_1^0 e + 235\ 91\ Pa$

Question 4

A nuclide of Th-225 undergoes 3 alpha decays, 4 beta decays, and a gamma emission. What is the final product?

Accepted Answer

Radium

Question 5

Which of the following is the correct nuclear equation for the positron emission of Radon-222?

Accepted Answer

$222\ 86\ Rn \rightarrow \_1^0 e + 222\ 85\ At$

Question 6

In positron emission, what happens to the atomic number and mass number of the original nucleus?

Accepted Answer

Atomic number decreases by 1, mass number remains the same.

Question 7

Which of the following statements about positron emission is correct?

Accepted Answer

It converts a proton into a neutron.

Question 8

Given the following nuclear reaction: $\_1^0 e$ is emitted, what type of decay is this?

Accepted Answer

Positron emission

Question 9

Which of the following is a real-world application of positron emission?

Accepted Answer

PET scans in medical imaging

Question 10

If a nuclide undergoes positron emission, which of the following changes occurs in the nucleus?

Accepted Answer

A proton is converted into a neutron.

Question 11

Which of the following best explains why positron emission does not change the mass number of a nuclide?

Accepted Answer

A proton is converted to a neutron, so the total number of nucleons remains the same.

Question 12

Which of the following is the correct sequence of changes for the atomic number ($Z$) and mass number ($A$) during positron emission?

Accepted Answer

$Z$ decreases by 1, $A$ unchanged

Question 13

A scientist observes a nuclear reaction where the product has an atomic number one less than the reactant, but the mass number is unchanged. Which type of decay most likely occurred?

Accepted Answer

Positron emission

Question 14

Which of the following is a balanced nuclear equation for the positron emission of an isotope $X$ with mass number $A$ and atomic number $Z$?

Accepted Answer

$A\ Z\ X \rightarrow \_1^0 e + A\ (Z-1)\ Y$

Question 15

Which of the following best describes the role of gamma emission in the decay sequence of Th-225 as shown in the example?

Accepted Answer

It allows the nucleus to release excess energy without changing its atomic or mass number.

Positron Emission and Nuclear Decay in GOB Chemistry

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