Questions: Experiments were done on a certain pure substance X to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of X, if you can. If you don't have enough information to decide, choose can't decide in the third column. property experiment physical or chemical? --------- 0 A sample of solid X is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of O may be calculated. - O physical - O chemical - O (can't decide) R Into one chamber of an electrochemical cell, a solution of X is introduced, along with a metal electrode. In the other chamber a solution of a known oxidizing reagent O is introduced, along with another metal electrode The voltage across the electrodes is proportional to the tendency of O to react with X. By measuring this voltage, the value of R may be calculated. - O physical - O chemical - O (can't decide) E A thin sample of X is put between metal plates. A radio-frequency electric current is applied to the plates and passes through the sample. From the measured voltage across the plates the value of E may be calculated. - O physical - O chemical - O (can't decide)

Transcript text: Experiments were done on a certain pure substance $X$ to determine some of its properties. There's a description of each experiment in the table below. In each case, decide whether the property measured was a chemical or physical property of $X$, if you can. If you don't have enough information to decide, choose can't decide in the third column. \begin{tabular}{|c|c|c|} \hline property & experiment & physical or chemical? \\ \hline 0 & A sample of solid $X$ is carefully weighed and put inside a vented flask. The flask is heated until oxygen gas starts being produced. After no more oxygen gas is produced, the contents of the flask are removed and weighed, and from the decrease in weight the value of $O$ may be calculated. & \begin{tabular}{l} O physical \\ O chemical \\ O (can't decide) \end{tabular} \\ \hline $R$ & Into one chamber of an electrochemical cell, a solution of $X$ is introduced, along with a metal electrode. In the other chamber a solution of a known oxidizing reagent $O$ is introduced, along with another metal electrode The voltage across the electrodes is proportional to the tendency of $O$ to react with $X$. By measuring this voltage, the value of $R$ may be calculated. & \begin{tabular}{l} O physical \\ O chemical \\ O (can't decide) \end{tabular} \\ \hline $E$ & A thin sample of $X$ is put between metal plates. A radio-frequency electric current is applied to the plates and passes through the sample. From the measured voltage across the plates the value of E may be calculated. & \begin{tabular}{l} O physical \\ O chemical \\ O (can't decide) \end{tabular} \\ \hline \end{tabular}