Which equations represent chemical reactions: (a) CO2(s) →CO2(g) (b) 3 O2(g) →2 O3(g) (c) NaCl(s

step 1 We are asked which of the following represent chemical reactions. I'll jot them down quick. This

Which equations represent chemical reactions: (a) CO2(s)...

Which equations represent chemical reactions: (a) $\mathrm{CO}_{2}(s) \rightarrow \mathrm{CO}_{2}(g)$ (b) $3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{O}_{3}(g)$ (c) $\mathrm{NaCl}(s)+\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{NaOH}(a q)+\mathrm{HCl}(a q)$ (d) $\mathrm{H}_{2} \mathrm{O}(g)+\mathrm{CH}_{4}(g) \rightarrow \mathrm{CH}_{4}(g)+\mathrm{H}_{2} \mathrm{O}(g)$

Which equations represent chemical reactions:
(a) $\mathrm{CO}_{2}(s) \rightarrow \mathrm{CO}_{2}(g)$
(b) $3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{O}_{3}(g)$
(c) $\mathrm{NaCl}(s)+\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{NaOH}(a q)+\mathrm{HCl}(a q)$
(d) $\mathrm{H}_{2} \mathrm{O}(g)+\mathrm{CH}_{4}(g) \rightarrow \mathrm{CH}_{4}(g)+\mathrm{H}_{2} \mathrm{O}(g)$

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Key Concepts

Chemical Reaction

A chemical reaction is a process in which substances, known as reactants, are transformed into new substances called products through the breaking and forming of chemical bonds. This process leads to a change in the chemical composition, producing substances with different properties, and is typically represented by an equation that shows the transformation from reactants to products.

Physical Change

A physical change involves a change in the state or appearance of a substance without changing its chemical composition. Examples include phase transitions such as melting, evaporation, or sublimation, where the same chemical species is present before and after the change. Recognizing physical changes is important when evaluating equations to determine whether a process is truly a chemical reaction.

Assessing Reaction Equations

Evaluating whether an equation represents a chemical reaction involves analyzing if the process entails an alteration in chemical identity or composition. This analysis focuses on identifying whether the substances undergoing the process are chemically transformed into different compounds, or if the change observed is merely physical, such as a phase change or simple mixing that does not involve chemical bond rearrangements.

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