Question

Use the reaction to answer the question.

C2H4 + O2 → CO2 + H2O

How many bonds are broken when performing the reaction? How many bonds are formed?
(Reminder to check if the reaction is balanced)

(1 point)

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=H, 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 OC-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.
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Answer 1

First balance: C2H4 + 3 O2 → 2 CO2 + 2 H2O.

Bonds broken:
- C2H4: 4 C–H and 1 C=C
- 3 O2: 3 O=O
Total broken = 4 C–H + 1 C=C + 3 O=O

Bonds formed:
- 2 CO2: 4 C=O
- 2 H2O: 4 O–H
Total formed = 4 C=O + 4 O–H

So the first choice is correct.