Which of the following shows an accurate combustion reaction?
. 2ch4 + o2 → 2ch3oh
. cu + o2 → cuo2
.mg + h2o → mgo + h2
. so + h2o → so2 + h2

B: Cu + O2 → CuO2

Explanation:

The person who aswered this question is wrong, It is not A. I took the test and got it wrong. It has to be B, Cu + O2 → CuO2 because I used all my three attempts on every single answer besides B because I was told it was wrong on here. A, C, and D all showed up incorrect on my three attempts. The other person who answered this must have had a different worded question. There is no other answer left so it had to have been B. Hope this helps.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.