Classify each chemical equation as a combination/synthesis, decomposition, single replacement , double replacement, or combustion
a. pb(s) + hg2so4 (s) > pbso4(s) +2 hg(i)
b. naci(aq) + agno3(aq) > agci(s) +nano3(aq)
c. 2h20(> 2h2(g) + 02(g)

Any info on neptunes spot? i need it for a project.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.