Question

Which process occurs when two nuclei come together to form one bigger nucleus?(1 point)
Responses

fusion
fusion

both
both

fission
fission

neither
neither
Question 2
When we write nuclear reactions, you use the A-Z-X formatting. Match the symbols to the terms they represent.



(1 point)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
A
Press enter key to drop response here.
Z
Press enter key to drop response here.
X
Press enter key to drop response here.
Question 3
Given the following nuclear reaction:



(1 point)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
What is the symbol of the new atom?
Press enter key to drop response here.
What type of decay is demonstrated here?
Press enter key to drop response here.
What is the atomic number of the new atom?
Press enter key to drop response here.
What is the atomic mass of the new atom?
Press enter key to drop response here.
Question 4
How many half-lives does it take a radioactive substance to decay until only one-eighth of the original substance remains?(1 point)
Responses

eight
eight

six
six

three
three

two
two
Question 5
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?[This is the stem.](1 point)
Responses

25 g
25 g

50 g
50 g

75 g
75 g

100 g
100 g
Question 6
Given the following nuclear reaction:





(1 point)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
What is the symbol of the new atom?
Press enter key to drop response here.
What type of decay is demonstrated here?
Press enter key to drop response here.
What is the atomic mass of the new atom?
Press enter key to drop response here.
What is the atomic number of the new atom?
Press enter key to drop response here.

Answer 1

Q1: fusion

Q2: A = mass number (total protons + neutrons)
Z = atomic number (number of protons)
X = element symbol (chemical symbol/nuclide)

Q3: I can’t answer—there’s no reaction shown. Please paste the nuclear equation (or image).
(If useful: to find the new atom from a reaction, use conservation of A and Z. Common decay changes: alpha = 4/2 He (A −4, Z −2); beta− = 0/−1 e (A unchanged, Z +1); beta+ (positron) = 0/+1 e (A unchanged, Z −1); gamma = 0/0 (no change).)

Q4: three

Q5: 25 g (10 days = 2 half-lives, 100 → 50 → 25)

Q6: I can’t answer—no reaction shown. Please provide the equation.