Question

The diagram represents the reaction of hydrogen gas and oxygen gas to produce water. Which statement best describes the reaction?

A.) More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is endothermic.

B.) More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic. **

C.) More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is exothermic.

D.) More energy is needed to break the bonds of the reactants than is released in the formation of the products, so the reaction is endothermic.

Answer 1

Modeling Energy Change Quick Check 5/5 100%

1. Which phrase describes the initial input of energy that is needed to break bonds in a chemical reaction?
- activation energy

2. The diagram represents the reaction of hydrogen gas and oxygen gas to produce water. Which statement best describes the reaction?
- More energy is released in the formation of the products than is needed to break the bonds of the reactants, so the reaction is exothermic.

3. Hydrogen gas (H2) and oxygen gas (O2) combine. Which change occurs that indicates a release of bond energy?
- a loud popping noise

4. Which statement explains why the electrolysis of hydrochloric acid (HCl) is an endothermic reaction?
- It requires electricity to sustain the reaction.

5. Use the chemical equation to answer the question.
2H2(g) + O2(g) → 2H2O(l)
Which statement describes the breaking and forming of bonds in the reaction?
- The reaction requires breaking one O=O bond and two H-H bonds,

Answer 2

I don't see a diagram. Even though I can't see the diagram I think you have chosen the correct answer.

Answer 3

second part of number 5 answer got cut off:

The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O-H bonds.

Answer 4

Thanks Heyo and Dr. Bob

Answer 5

thx dad