Egg in a Flask

In 8th period we put a boiled egg in a flask!

Can you explain how we got the egg into the flask?

Can you explain how we got the egg out again?

Ask your chemist!

(Thanks to this web page for the great sequential picture!)

Scan this and answer in the comments!

Marshmallows Again: Pressure-Volume

Today we explored the inverse relationship between Pressure and Volume of a gas using plastic syringes. We experienced this relationship by feeling the "push" and "pull" against the gas molecules both inside the syringe and outside, saw this visually using marshmallows inside the syringe, and also used the Logger Pro software and Vernier Gas Pressure sensors to graph this relationship.

Deriving Absolute Zero: Pressure and Temperature

Today we did a simple activity where we measured the pressure of a gas in a sealed steel sphere (try saying that three times fast!) at three different temperatures.

We graphed our data points and then extrapolated a best-fit line to estimate the x-intercept. We discussed that this was the point of ABSOLUTE ZERO, -273 degrees Celsius, the point of zero kinetic energy!

We were amazed that gas particles behave in a way that generates a directly proportional relationship between pressure and temperature, and that we could estimate this point from three simple data points.

Great job, chemists!

S'mores and Stoichiometry!

We applied the concept of stoichiometry to a popular recipe for a beloved snack, S'mores! We calculated the total masses of ingredients we would need and S'mores we would produce if we used an entire bag of marshmallows to make S'mores (which we did). Then we got to roast the marshmallows over a brand new Bunsen Burner and enjoy S'mores! (Thanks to another chemistry teacher for the picture!)

5 + 5 + 5 = 500

One of my chemists shared this puzzle with me:

How can you make 5 + 5 + 5 = 550 using the symbols | _ / \.

Can you figure it out?

Gas Laws and Eudiometers!

We are having a great time in chemistry studying gas laws and the phases of matter!

Our chemists completed an experiment where we reacted hydrochloric acid and magnesium metal and trapped the hydrogen gas in a glass eudiometer tube. Students had to balance the equation and perfome the stoichiometry (ask your chemist what that word means!) calculations for the reaction. We also discussed what would happen to the gas if we had collected it at different temperatures and pressures.

Great job, chemists!