What equation would i use for this? —> uranium-233 undergoes alpha decay

₉₂²³³U ⟶ ₉₀²²⁹Th +

Your equation is:  

₉₂²³³U ⟶ ? + α

It becomes easier to balance the equation if we replace the "?" with an element symbol _x^yZ.

Then the equation becomes

₉₂²³³U ⟶ _x^yZ + α

We should also recall that a α particle is helium nucleus. Its nuclear symbol is .

The equation then becomes

₉₂²³³U ⟶ _x^yZ +

The main point to remember in balancing nuclear equations is that **the sums of the superscripts and the subscripts must be the same on each side of the equation**.

Sum of superscripts: 233 = y + 4, so y =229.

Sum of subscripts:       92 = x + 2, so x = 90.

₉₂²³³U ⟶ ₉₀²²⁹Z +

The element with atomic number 90 is thorium, Th.

∴ The nuclear equation is

₉₂²³³U ⟶ ₉₀²²⁹Th +

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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stan bts

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.