Gases and Climate Change

1) Combustion
Hypothesis: When the rubbing alcohol is ignited, it will blow up.
Observation: the flame caused the rubbing alcohol to act as fuel for the bottle and shot it 5-8 ft. It had a delay of 0.5 seconds.

The combustion and gases such as methane can hurt the environment by collecting in the atmosphere and trap the heat there. This causes glaciers and icebergs to melt and make the water rise.



2) CO2
Hypothesis: the candles will be put out.
Observations: the gas put out the candles because CO2 deprived the flame of the oxygen

Carbon dioxide affects the atmosphere because the ratio between the plants that photosynthesize and CO2

*sodium bicarbonate: NaHCO3 is split into Na, H, O and CO2.



3) Hydrogen
Hypothesis: the hydrogen will fuel the flame, unlike the co2
Observations: the zinc popped and crackled as soon as it was introduced to the hydrochloric acid and when the flame was introduced, the

4) Air pressure

Hypothesis 1: The gas in the can will escape

Observation 2: Absolutely nothing happened

Hypothesis 2: The can will expand, because water will come in

Observations 2: The can collapsed on itself, BOOM! noise

Chernobyl Lingers On

Article Link:
http://news.bbc.co.uk/2/hi/science/nature/743879.stm

Summary:
This article speaks of the radioactive components of the Chernobyl disaster and how they still affect our behavior today. Caesium, one such component, is being released after being absorbed by the soil, disproving previous belief. This means that the area is not cleaning itself of radioactivity fast enough. This is causing the ban on certain foods from that area in the United Kingdom to extend about 100 times longer. This ban includes Cumbrian sheep, fungi, fish, forest berries and other items.

Questions

What isotope of caesium is mentioned?

How long did scientists originally predict that Cumbrian sheep should stay out of the food chain?

How much longer should the ban stay in place?