Chemistry, 26.08.2019 13:20 kaseykrueger47
Why can you remove paint with white spirit but not water?
Answers: 1
Chemistry, 22.06.2019 06:00
According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead
Answers: 2
Chemistry, 22.06.2019 11:40
Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)
Answers: 1
Why can you remove paint with white spirit but not water?...
Mathematics, 28.06.2019 07:10
Mathematics, 28.06.2019 07:10
Mathematics, 28.06.2019 07:10
Chemistry, 28.06.2019 07:10
Mathematics, 28.06.2019 07:10
Mathematics, 28.06.2019 07:10
English, 28.06.2019 07:10