PAG 8.3 Estimating the Work Done by a Gas when Temperature Increases Flashcards
How does the volume of a gas change when its temperature increases at a constant pressure
As temperature increases, the volume also increases
Two quantities are directly proportional to each other
State the value of standard atmospheric pressure
101kPa
State Charles’ Law
When ketp at a constant pressure, absolute temperature and volume of a gas are directly proportional
How would you go about measuring the cross section of the inside of a syringe
Micrometer and sub diameter into circular area equation
With plunger removed
Why should the clip used ot seal the tubing coming from the syringe be as close to the syringe tip as possible
Volume of air trapped in the tubing should as small as possible so that it is negligible compared to the volume of the syringe
Suggest how a mass hanger could be attached to the plunger of a syringe
String can be tied to the plunger with a loop which the masses can hang from
How can the force exerted by the masses be calculated?
F = mg
How can the pressure be exerted by the masses on the air sample be calculated?
P = F/A
Pressure subtracted from atmospheric pressure
What equation is used to calculate the work done on a gas as it expands?
Work done = pressure x change in volume
What safety precautions should be taken when working with a hot beaker of water?
Avoid touching the hot beaker with bare hands, and ensure it is handled with care to avoid spillages.
Heatproof mat should be used to protect the bench
What should you do before recording each measurement of water temperature?
Stir water before taking temperature so reading is an appropriate and accurate reflection of the average temperature of water in the beaker
