Oh not prof. vitarelli spots sybil running down the yelling something about her tea prof. vitarelli and prof. snape try to hold her back. but they fail. she yells, i’ve learned another exam question from last year! zinc metal reacts with hydrochloric acid to produce hydrogen gas and an aqueous solution of zinc(ii) chloride. what is the reducing agent in this reaction? maybe prof. umbridge was right in trying to remove her.

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]