Name:______Period:______

Properties of Gases

Purpose:To investigate the properties of gases

Safety: goggles, apron

Procedures:Station 1- Inflate+ tie balloon.Weigh using tape to hold in place. Use a pin to gently puncture balloon near neck, release air, weigh deflatedballoon w/tape.Station 2- With open end down, lower empty cup into water andslowly tilt.

Station 3- Insert rounded end of balloon into bottle.Stretch balloon’s neck over mouth of bottle. Blow up balloon.

Station 4- Fill test tube to rim w/water.Cover w/plastic.Press down on plastic, invert test tube over sink;w/o causing any jarring,gently remove finger from plastic.Repeat w/test tube half full of water.Station 5- Cover small hole on side of plastic bottle w/finger.Fill bottle w/water.Replace cap tightly. Holding bottle over sink, remove finger.Over sink, remove cap.Station 6- Place 10 mL water in can + place on hot plate; bring water to rapid boil.Using tongs, quicklyinvertcan into ice water. Station 7- Fill test tube to rim w/water.Cover w/plastic.Press plastic to test tube, invert,lower into water.Remove plastic.Move test tube up and down, keeping opening under water.Repeat w/test tube half full of water.Station 8- Draw air into a syringe. Place cap on end.Hold cap in place, gently push plunger down.Release plunger.Station 9- Submerge inflated blue ballooninto ice water. Use tongs to submerge an equally sized inflatedred balloon into hot water. Station 10- Put one end of straw in cup of water. Hold another straw outside cup. Place both straws in your mouth and try to drink water through straws.

Data Table-predict what will happen at each station before each experiment

Station / Prediction / Observation
1 / The mass of the deflated balloon will be [less/more].
2 / Water [fills/doesn’t fill] the cup.
3 / The balloon [will/ won’t] inflate.
4 / The water[stays / doesn’t stay] in the test tube.
5 / Water [stays in / leaks out] of the bottle.
6 / The inverted can [implodes / explodes / does nothing].
7 / Water level in test tube [doesn’t change/changes].
8 / The plunger[can/can’t] be easily depressed.
9 / The blue balloon gets [bigger/smaller]; the red gets [bigger/smaller]
10 / I [will / won’t] be able to drink the water.

Questions-Answer in complete sentences.

1. How did this lab demonstrate air is matter (has mass and volume/takes up space)?______

______

2. How did this lab demonstrate that air exerts pressure?______

______

3. Explain the difference between one of your predictions and the actual outcome.______

______