N₂O₄ (g) ⇌ 2 NO₂ (g)
Kc = [ NO₂ ]² / [ N₂O₄ ]
4.2 = [ 0.785 ] [ N₂O₄ ]
[ N₂O₄ ] = 4.2 / 0.785
[N₂O₄ ] = 5.350 M
hope this helps!
Answer:
A well-defined, natural substance with a structure in crystalline form.
Explanation:
Minerals have a crystalline structure and are different from elements because they are made of a combination of different elements. For similar reasons they cannot be considered either since rocks do not have a fixed, specific chemical composition and minerals do. As such, the chemical composition defines it as being that particular mineral. Although it must occur in natural form, minerals can have biological or non-biological origins.
Forming oxygen by bubbling fluorine through water.
The most important thing to determine whether a change is physical or chemical is whether the substance was changed. When the substance being changed, it is chemical change. Otherwise, it is physical.
Answer:
Venus's rotation is retrograde compared to Earth's.
Explanation:
Firstly its axis of rotation is inclined at 177.36 degrees (compared to 23.5 degrees on Earth). This means that Venus rotates in a retrograde direction from east to west, making the Sun rise in the west and set in the east. Further to this the rotation is very slow: a sidereal day on Venus lasts 243 Earth days.