Question

Helphelphelp I'll attach picture and questions at bottom.

Answer 1

Figure 14-1 shows the decay of a sample of neptunium-238 over a period of 10 days. What is the half-life of neptunium-238?


An iron nail (Fe) is placed into a solution of copper(II) sulfate (CuSO4). After some time, the blue color of the copper(II) sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron(II) sulfate (FeSO4), and the container feels warmer than before the reaction.

Does this reaction absorb or release energy? How do you know?

What do the color changes indicate?

Answer 2

Half-life is when a radioactive isotope has been reduced to 50% of its initial mass, that should be clue enough.

Read up on Exergon- & Endergon reaction and determine which one of these two it is.
Also might do you good to check up on Fe oxidation by oxygen.

Answer 3

Lol, I am honestly completely confused.

Answer 4

Q) What is the half-life of neptunium-238?
A) Half-life is when a radioactive isotope has been reduced to 50% of its initial mass, that should be clue enough.
neptunium-238 being the radioactive isotope

Q) Does this reaction absorb or release energy? How do you know?
A) Read up on Exergon- & Endergon reaction and determine which one of these two it is.

Q) What do the color changes indicate?
A) Also might do you good to check up on Fe oxidation by oxygen.

Answer 5

Does this help?

Answer 6

yes thank yo