8.10B candle lab.

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Presentation transcript:

8.10B candle lab

What gas is needed for the candle to burn?

What gas is needed for the candle to burn? Fire needs oxygen, fuel and heat to start. Oxygen is present all around in the air

What happened when you inverted the test tube?

What happened when you inverted the test tube? Flame dimmed and eventually went out. After a moment the water rose inside the test tube

What happened to the temperature of the air inside the test tube once it was inverted over the flame?

What happened to the temperature of the air inside the test tube once it was inverted over the flame? The temperature increased so the air pressure decreased

So how’d the water get inside the test tube So how’d the water get inside the test tube??!!! Log on to Edmodo and blog a possible answer to this for your group

The flame goes out due to a lack of oxygen in the container. Hot air Cold water The higher pressure on the water outside the test tube pushed water inside the test tube where the air pressure was lower

I know what you're thinking… I know what you're thinking….the vacuum is sucking the water into the tube right? You have the right idea, but scientists try to avoid using the term "suck" when describing a vacuum. Instead, they explain it as gases exerting pressure from an area of high pressure to an area of low pressure.

To sum it all up…… We created an area of low pressure in the test tube by heating the air inside the container. We quickly prevented the outside, higher pressure air from moving inside the container to equalize the pressure by inverting the test tub in water. The outer higher pressure air pushes on the water, causing the outside water to be pushed inside the test tube!

Connection to wind?? Since stronger high-pressure systems contain cooler or drier air, the air mass is more dense and flows towards areas that are warm or moist which are in the vicinity of low pressure areas Clockwise like the screwdriver Counterclockwise like the screwdriver

Can lab How am I going to get my can to collapse on itself due to air pressure? Hmmmmm….think about it with your group. You will get a bucket of ice cold water, a hot plate, tongs and one empty soda can.