11. The major constituents of the Earth's current atmosphere are
a. moslty oxygen with some CO2
b. 78% oxygen, 21% nitrogen
C.78% nitrogen, 21% oxygen
12. The Earth's primitive atmosphere
a. was primarily hydrogen and helium, like the giant planets'
b. escaped due to the Earth's rapid loss of heat from its interior
C. was mostly carbon dioxide, since plants hadn't yet formed to add oxygen
13. The Earth's magnetic field stretches out in an area called the
A. Magnetosphere
b. Troposphere
C. Atmosphere
Answers: 3
Chemistry, 21.06.2019 16:00
The overall chemical reaction for photosynthesis isshown below: 6co2 + 6h20 → c6h12o6 + 602what mass of glucose (c6h1206) can form from71.89 g co2? (molar mass of c6h1206 = 180.18g/mol; molar mass of co2 = 44.01 g/mol)71.89 g co2=g c6h1206
Answers: 1
Chemistry, 22.06.2019 15:20
An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.
Answers: 1
11. The major constituents of the Earth's current atmosphere are
a. moslty oxygen with some CO2
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