Chemistry, 28.10.2020 16:30 lizatapper5054
While running a new reaction, a chemist notices the evolution of a gas. A sample of this gas gave a mass spectrum in which the molecular ion (m/z = 44) was the largest ion peak. The only other significant peaks were observed at m/z = 28 & m/z = 16. What is this gas?
Answers: 3
Chemistry, 22.06.2019 02:30
List four observations that indicate that a chemical reaction may be taking place
Answers: 1
Chemistry, 22.06.2019 08:00
Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.
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
While running a new reaction, a chemist notices the evolution of a gas. A sample of this gas gave a...
English, 28.01.2020 00:31
Mathematics, 28.01.2020 00:31
Mathematics, 28.01.2020 00:31
Chemistry, 28.01.2020 00:31
Physics, 28.01.2020 00:31
Health, 28.01.2020 00:31
Business, 28.01.2020 00:31
Geography, 28.01.2020 00:31
World Languages, 28.01.2020 00:31
Mathematics, 28.01.2020 00:31
Mathematics, 28.01.2020 00:31
Mathematics, 28.01.2020 00:31