Question

use the following information to answer the next question. a sealed syringe can be used to determine the effects of pressure on a gas. 1. which of the following changes will cause a decrease in pressure to the gas contained in a large syringe closed - off at the end? increase the gas volume by pulling on the plunger. increase the gas temperature as the plunger is pushed in. decrease the gas volume by pressing on the plunger. increase the gas temperature as the plunger is held in place

Explanation:

Step1: Recall gas - law relationship

According to Boyle's law ($P_1V_1 = P_2V_2$ for a fixed amount of gas at constant temperature), pressure and volume are inversely proportional. According to Gay - Lussac's law ($\frac{P_1}{T_1}=\frac{P_2}{T_2}$ for a fixed amount of gas at constant volume), pressure and temperature are directly proportional.

Step2: Analyze each option

• Increasing the gas volume by pulling on the plunger: By Boyle's law, when volume $V$ increases at constant temperature, pressure $P$ decreases.
• Increasing the gas temperature as the plunger is pushed in: Pushing in the plunger decreases volume, increasing pressure. Increasing temperature also increases pressure according to Gay - Lussac's law.
• Decreasing the gas volume by pressing on the plunger: By Boyle's law, decreasing volume increases pressure.
• Increasing the gas temperature as the plunger is held in place: By Gay - Lussac's law, increasing temperature at constant volume increases pressure.

Answer:

Increase the gas volume by pulling on the plunger.