pressure and temperatures

this week i took the energy test.
i thought it was very very hard!
we also did a lab called The Pressure of Gases.
there were lots of stuff in this lab, like a balloon in a bottle, and eyedropper in a plastic beaker, and a cracking soda can.
we had to draw the moving molecules in the packet.
another lab that we did was based on Gay-Lussac's Law: P vs T, at constant.
in that lab we measured the temperature and pressure of room temperature water, warmer water, hot water, very hot water, and hot oil.
we had to make a graph afterwards.
today is a minimum day!
YEH!

equilibrium

this week we did a packet on equilibrium.
the following monday is the test on energy.
we have to use the formula Q=mcΔT.
we also learned about exothermic and endothermic energy.
to learn about activation energy, we watched a Molecules in Action, a video.
the lab we did this week involved phase changes.
i have to play games and study now.

heat, energy, and elephant tooth paste

we got a new packet this week.
it was about heat and energy.
we also did a lab involving the 3 different phases of water: gas, liquid, and solid.
first, we got a piece of ice and putted it in the beaker.
then , we started heating it up until it became liquid, then gas.
we had to measure the temperature every minute for 15 seconds.
the temperature increase then decreased a little then increase.
it was not very stable.
we made elephant toothpaste!
i forgot what it was made from. but the result was some very hot yellow foam.
it cooled down fast though.
that was about it for this week.

thermochemistry

this week we worked on thermochemistry.
we learned about how heat transfers from the hot object to the cold.
the energy from the hot objects moves to the cold object.
we also did a lab with the bunsen burner again.
we had to weigh the cups and every little detail.
i think i did it wrong though.
we got a new packet that was just due this friday.
it was about the flow of energy.
the picture is of a beaker that stuck to the piece of wood because of the transfer of energy.

stoichiometry lab: Na2Co3 plus HCl

this week, we did a lab involving fire again.
we boiled hydrochloric acid with sodium carbonate.
when, we burned it for about 5 minutes, the contents boiled away.
we had to weigh the beaker, beaker + HCl, beaker + NaCl (aq), and beaker + NaCl (s).
click here to find the results of the lab( not our results though, the general result)
the picture is of bubbling hydrochloric acid!
tomorrow, we are going to take the stoichiometry test.
i do not think i'm ready, so i got to go study.
the yellow stoichiometry packet is also due tomorrow.
that's a lot of work!

stoichiometry

stoichiometry can be simplified as grams to moles to moles to moles to grams.
we worked on that this week.
we also did a lab called oxidation of magnesium.
in that lab, we burned magnesium ribbon.
before, we weighed the cruicible.
after, we weighed the magnesium oxide with the cruicible.
we had 31.67% error on ours, because we didn't scrape out the scraps from the previous period.
now, i am going to get my blog posts checked.

reactions 2 packet

we worked on the reactions 2 packet this week.
we had to balance synthesis reactions, decomposition reactions, and double-replacement reactions.
it was homework this week to finish up the packet.
we also saw fire in class.
i forgot what it was, but bubbles added to a lighter made a bright and pretty flame!
this week was also the cahsee testing.
i don't have a first period, so i was not use to going to school so early.
it was pretty easy though.
this whole week was easy!