Question

1. Which element is oxidized in the following reaction:
CuO(s) + H2 (g) -> Cu(s) + H2O (l)

2. What type of radiation is emitted when K-38 decays into Ca-38? Show the nuclear equation that leads you to this answer.

3. A radioactive nucleus decays to yield a bismuth-211 nucleus and an alpha particle. What was the identity of the original nucleus? Show the nuclear equation that leads you to this answer.

Answer 1

1. CuO

Answer 2

2. K-38 is element 19. It has 19 protons. So it has 38 - 19 = 19 neutrons.
Ca-38 is element 20. It has 20 protons. So it has 38 - 20 = 18 neutrons.

Ca-38 has gained a proton and lost a neutron. So a neutron must have decayed into a proton. What sort of decay does that happen in?

Answer 3

3. 85At215 --> 2He4 + 83Bi211

Answer 4

Those should be correct.

Answer 5

on 1. its just CuO and not CuO(s) ? 2. is beta decay? 3. whats the identity? @drewsorr1

Answer 6

1. CuO or CuO(s). 2. I think so. 3. I'm not actually too sure, but here's the equation. http://prntscr.com/6m02eh

Answer 7

could you help with one more? @drewsorr1

Answer 8

Sure. :)

Answer 9

4. The following unbalanced equation describes the reaction that can occur when dinitrogen tetroxide, N2O4, is combined with hydrazine, N2H4.
N2O4 (l) + N2H4 (l)  N2 (g) + H2O (g)
Balance the equation and describe in words the electron transfer(s) that takes place.
Answer: N2O4 (l) + 2N2H4 (l)  3N2 (g) + 4H2O (g)
But I dont know how to describe the electron transfer that takes place.

Answer 10

Could you send me a picture of the question? I'm seeing a bunch of errors.

Answer 11

How? the blank box  is suppose to be an arrow --> @drewsorr1