Answers: 3
Chemistry, 21.06.2019 15:00, Dreambig85
Use examples from the article to explain one positive and one negative effect that chemistry has had on society
Answers: 2
Chemistry, 22.06.2019 11:40, Wemaybewrong
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
How many grams of NaC2H3O2 would be required to prepare 475 g of an aqueous solution containing 3.47...
Mathematics, 15.06.2021 18:10
Mathematics, 15.06.2021 18:10
Chemistry, 15.06.2021 18:10
Mathematics, 15.06.2021 18:10