The table shows four reactions. Reactions
Reaction Equation
1 C3H8 + 5O2 → 3CO2 + 4H2O
2 C2H4 + H2 → C2H6
3 AgNO3 + NaCl → AgCl + NaNO3
4 2Fe + O2 → 2FeO

Which of the above reactions is an example of combustion of an organic substance? (5 points)
1
2
3
4

1

Explanation:

combustion reaction involves oxygen, so fire burns with oxygen.

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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