We did a melting a chocolate lab. These are the questions
Please help please help
...
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
Chemistry, 22.06.2019 13:00
What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?
Answers: 2
Chemistry, 22.06.2019 13:00
In a copper wire, a temperature increase is the result of which of the following
Answers: 1
Chemistry, 22.06.2019 15:30
The identities of substances are the same before and after which type of change
Answers: 1
Mathematics, 18.09.2019 00:30
Social Studies, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30
Biology, 18.09.2019 00:30
Social Studies, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30
World Languages, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30
Mathematics, 18.09.2019 00:30