Answers: 1
Chemistry, 22.06.2019 04:00
Gymnast always perform on padded mats. how does the mats protect the gymnast
Answers: 2
Chemistry, 22.06.2019 08:00
An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.
Answers: 1
Chemistry, 22.06.2019 11:00
When hydrochloric acid reacts with potassium hydroxide solution, the following reaction occurs. hcl (aq) + koh (aq) h2o (l) + kcl (aq) the reaction gives off heat energy, so it is an reaction.
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) 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
Why doesn't a mirror fog up from a far distance?...
History, 20.05.2020 13:57
History, 20.05.2020 13:57
English, 20.05.2020 13:58
Social Studies, 20.05.2020 13:58
Geography, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58
Chemistry, 20.05.2020 13:58
Mathematics, 20.05.2020 13:58