What are the half-reactions for a galvanic cell with Zn and Ni electrodes? A. Zn(s) → Zn2+(aq) + 2e and Ni2+(aq) + 2e → Ni(s)

B. Zn2+(aq) + 2e → Zn(s) and Ni(s) > Ni2+(aq) + 2e

C. Zn2+(aq) + 2e → Zn(s) and Ni2+(aq) + 2e → Ni(s)

D. Zn(s) → Zn2+(aq) + 2e and Ni(s) → Ni2+(aq) + 2e

(The answer is A. Btw)

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12