NEED HELP! URGENT! WILL MARK BRAINLIEST What is the oxidation number for “O” in ErO₂ ?
A. -6
B. -1
C. -4
D. 4
E. 2
-2
What is the oxidation number for “Er” in ErO₂ ?
A. -4
B. -2
C. +1
D. +2
E. +4

What is the oxidation number for “At” in AtO₃⁻ ?
A. +5
B. +7
C. -2
D. +3
E. -6

What is the oxidation number for “O” in AtO₃⁻ ?
A. -6
B. -4
C. +4
D. -2
E. -3
F. +2

Water ionizes by the equation h2o(l)⇌h+(aq)+oh−(aq) the extent of the reaction is small in pure water and dilute aqueous solutions. this reaction creates the following relationship between [h+] and [oh−]: kw=[h+][oh−] keep in mind that, like all equilibrium constants, the value of kw changes with temperature.

Select the correct answer. when carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: co2 + h2o → h2co3. if 495 milliliters of carbon dioxide at 25°c and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? use the periodic table and the ideal gas resource a. 0.889 g b. 1.10g c. 1.27g d. 2.02g what's the answer! quick!

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.