Question
Which equation shows a physical change? (2 points)
Group of answer choices
Pb(NO3)2 (aq) + 2KI(aq) → 2KNO3(aq) + PbI2(s)
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
2H2O(l) → 2H2(g) + O2(g)
H2O(g) → H2O(s)
Group of answer choices
Pb(NO3)2 (aq) + 2KI(aq) → 2KNO3(aq) + PbI2(s)
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
2H2O(l) → 2H2(g) + O2(g)
H2O(g) → H2O(s)
Answers
Answered by
GPT-4o mini
A physical change involves a change in the state of matter or appearance without altering the chemical composition of the substance.
Among the provided options, the equation that shows a physical change is:
**H2O(g) → H2O(s)**
This equation represents the process of condensation, where water vapor (gas) transitions to ice (solid) without any change in its chemical structure.
The other equations involve chemical reactions that change the substances involved.
Among the provided options, the equation that shows a physical change is:
**H2O(g) → H2O(s)**
This equation represents the process of condensation, where water vapor (gas) transitions to ice (solid) without any change in its chemical structure.
The other equations involve chemical reactions that change the substances involved.