Chemistry, 24.07.2019 18:00, asseatingbandit
The atoms of group b elements electrons when they form ions. options: a. either gain or lose b. gain c. cannot be determined d. lose
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) β h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 Β°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 12:30, skaterwolf1317
Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.
Answers: 2
Chemistry, 22.06.2019 16:30, ddmoorehouseov75lc
Correct relationship between molecular formula and empirical formula
Answers: 1
The atoms of group b elements electrons when they form ions. options: a. either gain or lose b. ga...
Mathematics, 08.01.2020 02:31
Mathematics, 08.01.2020 02:31
Mathematics, 08.01.2020 02:31
Chemistry, 08.01.2020 02:31
Mathematics, 08.01.2020 02:31
Mathematics, 08.01.2020 02:31
Mathematics, 08.01.2020 02:31