Question

When hydrogen burns in oxygen and forms water, which bonds are broken and which bonds are formed?(1 point)
Responses

Two H–H bonds are broken, one O=O bond is broken, and four H–O bonds are formed.
Two H–H bonds are broken, one O=O bond is broken, and four H–O bonds are formed.

One H–H bond is broken, one O–O bond is broken, and two H–O bonds are formed.
One H–H bond is broken, one O–O bond is broken, and two H–O bonds are formed.

Two H–H bonds are broken, one O=O bond is broken, and two H–O bonds are formed.
Two H–H bonds are broken, one O=O bond is broken, and two H–O bonds are formed.

Two H–H bonds are broken, one O–O bond is broken, and four H–O bonds are formed.

Answer 1

Reactant and Product Energy Change Quick Check

1 molecules must collide at a high enough energy to break bonds

2 the minimum amount of energy required to break bonds and start a chemical reaction

3 adding heat

4 More energy is released when forming the bonds of the products because a lot of heat is given off, which indicates energy was released.

5 Two H–H bonds are broken, one O=O bond is broken, and four H–O bonds are formed.

Answer 2

Two H–H bonds are broken, one O–O bond is broken, and four H–O bonds are formed.