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### A key step in balancing chemical equations is cor…

04:40
University of New Mexico

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Problem 9

Write "true" or "false" for each statement. (a) We balance chemical equations as we do because energy must be conserved. (b) If the reaction 2 $\mathrm{O}_{3}(g) \rightarrow 3 \mathrm{O}_{2}(g)$ goes to completion and all $\mathrm{O}_{3}$ is converted to $\mathrm{O}_{2},$ then the mass of $\mathrm{O}_{3}$ at the beginning of the reaction must be the same as the mass of $\mathrm{O}_{2}$ at the end of the reaction. (c) You can balance the "water-splitting" reaction $\mathrm{H}_{2} \mathrm{O}(I) \rightarrow \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g)$ by writing it this way: $\mathrm{H}_{2} \mathrm{O}_{2}(l) \rightarrow \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g)$

a) false
b) true
c) false

## Discussion

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## Video Transcript

for option A. The chemical equations are balanced to make sure there are equal number off atoms on. Both decide that is to justify the law off conservation off Mass. Hence the statement that reaction off balance to justify the law of conservation is false or option B. Consider the falling reaction off do or three plus for you, too, if the reaction goes to completion off all or three converted tow such that the mass off all three before the reaction is equal to the mass off or two after the reaction. This four news from the law off Conservation off Mars, which says that during a chemical reaction, the total mass remains constant. Therefore, the statement that the mask off a tree before the reaction is equal to the mass off Odo. After the reaction, it's true for Option C. Changing the sub script in the formula will change the reactant edge toe it's, too, or to riches copper oxide completely different from the water, which is the actual reactant hens. Changing the sub script changes the substance. Balancing a chemical equation is only done by changing the core. Fishing's never the subscript changing. The coefficients only changes the amount off compound, which the expert in the reaction hence the statement that water splitting reaction can be balanced by changing the substrate off oxygen is false.