Answers: 2
Chemistry, 22.06.2019 11:00
The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.
Answers: 1
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
Chemistry, 23.06.2019 00:30
Fred is studying a substance that is made out of only one element. this means that
Answers: 1
What is importance of periodic table...
History, 19.07.2020 01:01
Mathematics, 19.07.2020 01:01
Mathematics, 19.07.2020 01:01
Computers and Technology, 19.07.2020 01:01
Mathematics, 19.07.2020 01:01
Physics, 19.07.2020 01:01
Computers and Technology, 19.07.2020 01:01
Mathematics, 19.07.2020 01:01
Mathematics, 19.07.2020 01:01