Chemistry, 18.05.2021 03:30 andreanb3238
1. Scientists infer that most of Earth's earliest atmosphere was produced by
(1) a collision with a giant gas cloud
(2) capturing gases from a nearby planet
(3) vaporizing comets that impacted Earth's surface
(4) the escape of gases from Earth's molten surface
2. What percentage of Earth's history represents human existence?
(1) less than 1.0% (2) 1.8%
(3) 23.5%
v
(4) more than 98.6%
3. During which period in geologic history did the uplifting of the Adirondack Mountains begin?
(1) Quaternary
(2) Cretaceous (3) Triassic
(4) Cambrian
4. The graph below shows the decay of a radioactive material over time.
Answers: 2
Chemistry, 22.06.2019 07:40
21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8
Answers: 2
Chemistry, 22.06.2019 17:10
Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]
Answers: 2
Chemistry, 22.06.2019 21:30
Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.
Answers: 1
1. Scientists infer that most of Earth's earliest atmosphere was produced by
(1) a collision with a...
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