Question

Use the reaction to answer the question.
___C
H
+ ___ O
à
___CO
+ ___H
O
How many bonds are broken when performing the reaction? How many bonds are formed?
(Reminder : Check if the reaction is balanced)
(1 point)
2
4
2
2
2
Four C-H, one C-C, and three O-O bonds need to break up. Four C-O and four O-H bonds need to form.
Four C-H, one C-C, and one O-O bond need to break up. Two C-O and two O-H bonds need to form.
Four C-H, one C=C, and one O=O bond need to break up. Two C=O and two O-H bonds need to form.
Four C-H, one C=C, and three O=O bonds need to break up. Four C=O and four O-H bonds need to form.

Answer 1

The balanced reaction is C2H4 + 3 O2 -> 2 CO2 + 2 H2O.

Bonds broken:
- In C2H4: 4 C–H and 1 C=C
- In 3 O2: 3 O=O
So: 4 C–H, 1 C=C, and 3 O=O broken.

Bonds formed:
- In 2 CO2: 4 C=O (2 per CO2)
- In 2 H2O: 4 O–H (2 per H2O)
So: 4 C=O and 4 O–H formed.

Therefore the correct choice is the fourth one.