Calculate δs° for the following changes.

(a) sncl4 (l) ⟶ sncl4 (g)

(b) cs2 (g) ⟶ cs2 (l)

(c) cu(s) ⟶ cu(g)

(d) h2 o(l) ⟶ h2 o(g)

(e) 2h2 (g) + o2 (g) ⟶ 2h2 o(l)

(f) 2hcl(g) + pb(s) ⟶ pbcl2 (s) + h2 (g)

(g) zn(s) + cuso4 (s) ⟶ cu(s) + znso4 (s)

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)