Answers: 1
Chemistry, 22.06.2019 08:30
In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?
Answers: 2
Chemistry, 22.06.2019 10:30
Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?
Answers: 3
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 15:30
How does a large body of water, such as the ocean, influence climate?
Answers: 1
If 65.0mL of 1.50M H3PO4 is neutralized by 25.0mL of Ca(OH)2, what is the molarity of the base?...
Chemistry, 07.01.2021 17:50
Mathematics, 07.01.2021 17:50
Social Studies, 07.01.2021 17:50
Mathematics, 07.01.2021 17:50
Biology, 07.01.2021 17:50
Mathematics, 07.01.2021 17:50
World Languages, 07.01.2021 17:50
Geography, 07.01.2021 17:50
Health, 07.01.2021 17:50
Chemistry, 07.01.2021 17:50
English, 07.01.2021 17:50
Mathematics, 07.01.2021 17:50
Mathematics, 07.01.2021 17:50