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.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

the answer is b & c i believe : )