Chemistry, 29.03.2021 16:50 marlenemedina247
1. Which gas was prominent in our 2nd atmosphere but not in our third?
a) Carbon Dioxide b) Nitrogen
c) Helium
d) Oxygen
Answers: 3
Chemistry, 22.06.2019 11:00
The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?
Answers: 1
Chemistry, 22.06.2019 16:50
What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume
Answers: 2
Chemistry, 22.06.2019 20:00
Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.
Answers: 3
Chemistry, 23.06.2019 08:30
According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.
Answers: 1
1. Which gas was prominent in our 2nd atmosphere but not in our third?
a) Carbon Dioxide b) Nitroge...
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