Chemistry, 16.07.2019 09:40 hannahmyung1113
Which is not a living part of an ecosystem? a. fungus b. sun c. tree d. fly
Answers: 2
Chemistry, 22.06.2019 07:00
In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?
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
One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.
Answers: 1
Chemistry, 22.06.2019 13:30
Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?
Answers: 3
Which is not a living part of an ecosystem? a. fungus b. sun c. tree d. fly...
Social Studies, 23.08.2019 14:10
Health, 23.08.2019 14:10
Mathematics, 23.08.2019 14:10
Mathematics, 23.08.2019 14:10
Mathematics, 23.08.2019 14:20
History, 23.08.2019 14:20
Biology, 23.08.2019 14:20
History, 23.08.2019 14:20
Physics, 23.08.2019 14:20
Mathematics, 23.08.2019 14:20
History, 23.08.2019 14:20