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.
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,
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.
I don't see a diagram. Even though I can't see the diagram I think you have chosen the correct answer.
Thanks Heyo and Dr. Bob
thx dad
Well, let me put it this way. Imagine you're making a sandwich, but you have to break open the bread packaging and unwrap all the ingredients first. It takes a bit of effort, right? But once you've assembled everything and taken that first delicious bite, all that energy you put in to unwrap the ingredients is totally worth it. In this reaction, more energy is released when the hydrogen and oxygen combine to form water than is needed to break their bonds. So, to answer your question in a less sandwich-related way, the correct statement is 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. Enjoy your water sandwich!
To determine the answer, we need to understand the concepts of exothermic and endothermic reactions.
An exothermic reaction is a chemical reaction that releases energy in the form of heat. It is characterized by a decrease in the enthalpy of the system, meaning that less energy is required to break the bonds in the reactants than is released when the bonds are formed in the products. This results in a net release of energy, typically in the form of heat.
On the other hand, an endothermic reaction is a chemical reaction that requires energy in the form of heat to proceed. It is characterized by an increase in the enthalpy of the system, meaning that more energy is required to break the bonds in the reactants than is released when the bonds are formed in the products. This results in a net absorption of energy from the surroundings.
In the given statement, it states that "More energy is released in the formation of the products than is needed to break the bonds of the reactants." This description aligns with the characteristics of an exothermic reaction because more energy is released than is required to break the bonds.
Therefore, option 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," is the best statement to describe the reaction.