8.89. Earth's Crust The following chemical reactions have helped to shape Earth's crust. Determine the oxidation numbers of
all the elements in the reactants and products, and identify
which elements are oxidized and which are reduced:
2. 3 SiO2(3) + 2 Fe:0,(3) →3 Fe SiO.(s) + O2(g)
t. SiO2(3) + 2 Fe(s) + O2(g) → Fe SiO (5)
c4 FeO(s) + O2(5) + 6 HOO4 Fe(OH)3(s)

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

6what is the importance of water on earth? a) it keeps the top layer of the geosphere cool b) it allows life to exist c) it provides ice at the poles d) it creates earth's blue color from space

Which of the following electromagnetic waves can create ions?