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 00:00
How many peaks will be present in a mass spectrum for brcl?
Answers: 1
Chemistry, 23.06.2019 06:00
Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control?
Answers: 1
What is the concentration of a solution made by diluting 65 ml of 6.0 m hcl to a final volume of 750...
Mathematics, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30
Biology, 05.05.2020 01:30
English, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30
Chemistry, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30
Social Studies, 05.05.2020 01:30
Mathematics, 05.05.2020 01:30