What was first responsible for changing the formerly poisonous atmosphere to an oxygen-rich atmosphere as we have today?

Meteor impacts

Volcanic gases

Earthquakes

Photosynethic bacteria (Cyanobacteria)

How much ammonia (nh3) is produced from two moles of nitrogen gas? 3h2 + n2 - - > 2nh3?

Convert each of the potentials. The silver-silver chloride and calomel reference electrodes are saturated with KCl, KCl, resulting in cell potentials of + 0.197 V and + 0.241 V with respect to the standard hydrogen electrode (S. H. E.), respectively.

Combustion analysis of an unknown compound provides the following dаta: 73.5 grams carbon (C), 4.20 grams hydrogen (H) and 72.3 grams chlorine (Cl). What is the percent composition of each element in this compound?

Sunlight, when viewed through a prism or a diffraction grating, shows all of the colors of visible light. This is an example of a (A) bright line spectrum (B) continuous spectrum (C) infrared spectrum (D) visible spectrum (E) ultraviolet spectrum

Add 2 protons to carbon what element do you create

When an ionic compound such as sodium chloride (NaCl) is placed in water, the component atoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions (Cl-). In contrast, the atoms of covalently bonded molecules (e. g.

From A complete stop a car reaches a velocity of 280 KM/S east in 7 seconds what is the rate of acceleration? A. 4 KM/S B. 7 KM/S C. 40 KM/S D. 70 KM/S

How sand is deposited along coastline

How do the reaction rates change as the system approaches equilibrium?

Based on the symmetry of the molecules, which is a polar molecule? SeCl2 (bent) BeCl2 (linear) BF3 (trigonal planar) CF4 (tetrahedral) O2 (diatomic linear)